Ch.3 - Chemical ReactionsWorksheetSee all chapters
All Chapters
Ch.1 - Intro to General Chemistry
Ch.2 - Atoms & Elements
Ch.3 - Chemical Reactions
BONUS: Lab Techniques and Procedures
BONUS: Mathematical Operations and Functions
Ch.4 - Chemical Quantities & Aqueous Reactions
Ch.5 - Gases
Ch.6 - Thermochemistry
Ch.7 - Quantum Mechanics
Ch.8 - Periodic Properties of the Elements
Ch.9 - Bonding & Molecular Structure
Ch.10 - Molecular Shapes & Valence Bond Theory
Ch.11 - Liquids, Solids & Intermolecular Forces
Ch.12 - Solutions
Ch.13 - Chemical Kinetics
Ch.14 - Chemical Equilibrium
Ch.15 - Acid and Base Equilibrium
Ch.16 - Aqueous Equilibrium
Ch. 17 - Chemical Thermodynamics
Ch.18 - Electrochemistry
Ch.19 - Nuclear Chemistry
Ch.20 - Organic Chemistry
Ch.22 - Chemistry of the Nonmetals
Ch.23 - Transition Metals and Coordination Compounds
Jules Bruno

The balancing of chemical equations is based on the Law of Conservation of Mass, which states that matter cannot be created nor destroyed. This means that the number of reactant atoms must be the same as the number of product atoms. 

We call these elements, which don't change after a chemical reaction, immutable groups

Intro: Why Must We Balance Chemical Equations? 

A chemical equation serves as a symbolic representation of a chemical reaction and so knowing the numbers of each compounds involved is essential.


For the following equation the numbers in blue are called your coefficients and represent the number of moles for each compound shown. 

Balanced-Chemical-ReactionBalanced Chemical Equation

This written chemical reaction tells us a story that states, “2 moles of hydrogen, H­, react with 1 mole of oxygen , O­2 , to produce 2 moles of water, H2O. ” 


The numbers in red are the subscripts and combined with the coefficients give us the number of each particular element. 

Traditional-Balance Traditional Balance 

Determining the number of each element will also be needed for later calculations dealing with reaction stoichiometry, limiting reagent and identifying reaction types.


Instructions for Balancing

Balancing a chemical reaction doesn’t really require algebra, an Algebraic Balance or even a calculator. All you need to do is follow these instructions and you’ll be balancing like a pro. 


STEP 1: Set up a list for the elements that are reactants and another list for the elements that are products. If your numerical values in both lists don’t match then you’ll have to balance the chemical equation. 

 

The following chemical reaction deals with the combustion of gaseous butane: 

Balancing-with-states-with-phasesBalancing Combustion of Butane Equation


STEP 2: Start at the top and going down both lists make sure to balance each element one by one. 

 

Balancing-Equations-by-inspectionBalancing Equations by Inspection

STEP 3: At this point notice there are 4 carbon atoms as reactants versus 1 carbon atom as a product. 


Balance the number of carbon atoms by placing a “4” in front of CO­2. The “4” is distributed so the number of carbon and oxygen atoms are both affected.  

Balancing-carbon-atomsBalancing carbon atoms

STEP 4: Continuing down the lists we next balance the number of hydrogen atoms. 


The reactant side has 10 hydrogen atoms, while the product side has only 2 hydrogen atoms. So placing a 5 in front of H­2O will give 10 hydrogen atoms (2 x 5). 


Balancing hydrogen atoms

In addition the 5 in front of H2O is distributed to oxygen. We now have 5 oxygen atoms from H2O and 8 oxygen atoms from CO2, giving us a current total of 13 oxygen atoms. 


STEP 5: At this point we need to balance our oxygen atoms and in order to have 13 oxygen atoms on both sides we place “6.5” in front of O2 

Balancing-oxygen-atomsBalancing oxygen atoms


STEP 6: Although the chemical equation is balanced because both lists have identical numerical values, you want your coefficients to be whole numbers and not decimals or fractions. 

 

Balancing-equations-with-decimals-and-fractionsBalancing equations with decimals and fractions


STEP 7: This additional step is only necessary when you have a decimal or fraction as a coefficient. When balancing a chemical equation you need all the coefficients to be whole numbers. 


In this example, in order to convert 6.5 into a whole number we multiply the entire chemical equation by 2. 


Balanced-Chemical-EquationBalanced Chemical Equation


FOR EXPERTS ONLY: Eventually if you keep up with your chemistry studies you’ll be asked to do more advanced chemical reactions (redox, acids and bases, precipitation) while using simple stoichiometry. 


You may have to balance redox reactions in acidic solutions or basic solutions. Again you won’t have to balance these reactions algebraically or with advanced math. 


You may even be given just the reactants without the products. In this case you’ll have to deal with charges that are written as superscripts. These charged ions will be in the form of a cation and an anion and will include finding the net ionic equation.




Jules Bruno

Jules felt a void in his life after his English degree from Duke, so he started tutoring in 2007 and got a B.S. in Chemistry from FIU. He’s exceptionally skilled at making concepts dead simple and helping students in covalent bonds of knowledge.


Additional Problems
When the chemical equation for the complete combustion of toluic acid, CH3C6H4CO2H, to form carbon dioxide and water is balanced, the coefficient in front of the O 2 is a. 4 b. 10 c. 9 d. 5 e. 20
What are the coefficients for the decomposition of nitroglycerin? __ C3H5N3O9  → __ N2 + __ CO2 + __ H2O + __ O2 A. 2,3,6,2,1 B. 2,3,6,5,1 C. 4,6,12,10,12 D. 4,3,12,10,1 E. 4,6,12,10,1
Balance the following chemical equation. PCl3(l) + H2O(l) → H3PO3(aq) + HCl(aq)
What is the sum of the coefficients for the products in the following chemical equation? ______ C12H26 (g) + ______ O2 (g) → ______ CO2 (g) + ______ H2O (l)
What is the coefficient of aluminum phosphate once the reaction below is balanced?   ______ Hg3(PO4)2 (aq) + ______ Al (s) → ______ AlPO 4 (s) + ______ Hg (l)
When the equation below is balanced with the smallest set of coefficients, what is the coefficient of Zn? Zn + HNO3 → Zn(NO3)2 + NH4NO3 + H2O a. 1 (no coefficient written) b. 2 c. 3 d. 4 e. 6
When the following equation is balanced, the coefficient of sulfur dioxide is _____.  PbS (s) + O2 (g) → PbO (s) + SO2 (g)  A. 5  B. 1  C. 3  D. 2  E. 4
Write the balanced equation for the following reaction: aqueous sodium sulfide reacts with aqueous iron (III) nitrate to form aqueous sodium nitrate and solid iron (III) sulfide. What are the coefficients in the balanced reaction (write the substances in the order given)? A. 1, 1, 1, 3           B. 1, 2, 2, 3           C. 3, 2, 6, 1  D. 2, 3, 1, 6           E. 3, 1, 1, 3
What is the sum of the coefficients for the reactants in the balanced equation for the combustion of isopropyl alcohol: ______C3H8O + ______O2      →      ______CO2 + ______H2O a) 25 b) 13 c) 11 d) 6 e) none of the given answers
Balance the following chemical equations involving boron and/or fluorine: 1. B + Br2 → BBr3   2. B2O3 + C → B4C + CO   3. F2 + H2O → O2 + HF
After the following equation is balanced with the smallest possible whole numbers, what is the sum of the coefficients? NO2(g) + H2(g) → NH3(g) + H2O (l) (A) 4 (B) 10 (C) 15 (D) 17 (E) 20
Dinitrogen pentoxide is a gas that decomposes to form nitrogen dioxide gas and oxygen gas. Write a balanced equation for the reaction, and be sure to include the states of matter.
Balance this equation using the smallest possible integers, S + HNO3 → H2SO4 + NO2 + H2O. What is the coefficient of the water? (A) 1 (B) 2 (C) 4 (D) 6 (E) 10
Balance this equation using the smallest possible integers, NO + NH3 → N2 + H2O. What is the coefficient of the water? (A) 1 (B) 2 (C) 3 (D) 6 (E) 12
Balance the following chemical equations:
What is the coefficient of oxygen in the balanced combustion reaction of one (1) mole of acetone (C3H6O)? a. 1 b. 2 c. 3 d. 4 e. 5
What is the sum of the coefficients when the following equation is balanced with the smallest whole number coefficients? C12H10O + O2 → CO2 + H2O (A) 31 (B) 32 (C) 64 (D) 65 (E) None of the above  
When the following equation is balanced, the coefficient of sulfur dioxide is _______.  PbS (s) + O2 (g) → PbO (s) + SO2 (g) a. 5 b. 1 c. 3 d. 2 e. 4  
A reaction occurs between calcium nitrate and ammonium fluoride, producing calcium fluoride, dinitrogen monoxide, and water vapor. The correct set of stoichiometric coefficients, respectively, for the balanced reaction is: A) 3 6 6 3 4 B) 3 2 1 2 2 C) 1 2 2 1 1 D) 1 2 1 2 4 E) 2 1 2 2 2
What is the significance of the coefficients in a balanced chemical equation?
Write the balanced chemical equations for the complete combustion of acetic acid (CH3COOH), the main active ingredient in vinegar.
Write the balanced chemical equations for the decomposition of solid calcium hydroxide into solid calcium (II) oxide (lime) and water vapor.
Nitrogen (N2) and hydrogen (H2) react to form ammonia (NH3). Consider the mixture of N2 and H2 shown in the accompanying diagram. The blue spheres represent N, and the white ones represent H. Write the balanced chemical equation for the reaction.
The following diagram shows the combination reaction between hydrogen, H2, and carbon monoxide, CO, to produce methanol, CH3OH (white spheres are H, black spheres are C, red spheres are O). The correct number of CO molecules involved in this reaction is not shown. Determine the number of CO molecules that should be shown in the left (reactants) box.
Nitrogen (N2) and hydrogen (H2) react to form ammonia (NH3). Consider the mixture of N2 and H2 shown in the accompanying diagram. The blue spheres represent N, and the white ones represent H. How many molecules of ammonia can be made, assuming the reaction goes to completion, based on the diagram?
The following diagram shows the combination reaction between hydrogen, H2, and carbon monoxide, CO, to produce methanol, CH3OH (white spheres are H, black spheres are C, red spheres are O). The correct number of CO molecules involved in this reaction is not shown. Write a balanced chemical equation for the reaction.
A loud classroom demonstration involves igniting a hydrogen-filled balloon. The hydrogen within the balloon reacts explosively with oxygen in the air to form water. If the balloon is filled with a mixture of hydrogen and oxygen, the explosion is even louder than if the balloon is filled only with hydrogen, and the intensity of the explosion depends on the relative amounts of oxygen and hydrogen within the balloon. Look at the following molecular views representing different amounts of hydrogen and oxygen in four different balloons.Based on the balanced chemical equation, which balloon will make the loudest explosion?
A key step in balancing chemical equations is correctly identifying the formulas of the reactants and products. For example, consider the reaction between calcium oxide, CaO(s), and H2O(l) to form aqueous calcium hydroxide.Write a balanced chemical equation for this combination reaction, having correctly identified the product as Ca(OH)2(aq) .
A key step in balancing chemical equations is correctly identifying the formulas of the reactants and products. For example, consider the reaction between calcium oxide, CaO(s), and H2O(l) to form aqueous calcium hydroxide.Is it possible to balance the equation if you incorrectly identify the product as CaOH(aq)?
Consider the mixture of ethanol, C2H5OH, and O2 shown in the accompanying diagram. Write a balanced equation for the combustion reaction that occurs between ethanol and oxygen.
Consider the mixture of propane, C3H8, and O2 shown below. You may want to reference (Pages 106 - 110) Section 3.7 while completing this problem.Write a balanced equation for the combustion reaction that occurs between propane and oxygen.        
When a mixture of 13.0 g of acetylene (C2H2) and 13.0 g of oxygen (O2) is ignited, the resultant combustion reaction produces CO2 and H2O.Write the balanced chemical equation for this reaction.
You may want to reference (Pages 412 - 415) Section 9.10 while completing this problem.Enter a balanced chemical equation for the combustion of gaseous methanol.
A particular coal contains 2.5% sulfur by mass. When this coal is burned, the sulfur is converted into sulfur dioxide gas. The sulfur dioxide reacts with solid calcium oxide to form solid calcium sulfite.Write the balanced chemical equations for the reactions.
The source of oxygen that drives the internal combustion engine in an automobile is air. Air is a mixture of gases, which are principally N2 (~79%) and O2 (~20%). In the cylinder of an automobile engine, nitrogen can react with oxygen to produce nitric oxide gas, NO. As NO is emitted from the tailpipe of the car, it can react with more oxygen to produce nitrogen dioxide gas.Write balanced chemical equations for both reactions.
Sulfuric acid is a component of acid rain formed when gaseous sulfur dioxide pollutant reacts with gaseous oxygen and liquid water to form aqueous sulfuric acid.Write a balanced chemical equation for this reaction.
Nitric acid is a component of acid rain that forms when gaseous nitrogen dioxide pollutant reacts with gaseous oxygen and liquid water to form aqueous nitric acid.Write a balanced chemical equation for this reaction.
In a popular classroom demonstration, solid sodium is added to liquid water and reacts to produce hydrogen gas and aqueous sodium hydroxide.Write a balanced chemical equation for this reaction.
Write balanced chemical equations to correspond to each of the following descriptions.Solid calcium carbide, CaC2, reacts with water to form an aqueous solution of calcium hydroxide and acetylene gas, C2H2.
When iron rusts, solid iron reacts with gaseous oxygen to form solid iron(III) oxide.You may want to reference (Pages 120 - 123) Section 3.11 while completing this problem. Enter a balanced chemical equation for this reaction.
Write balanced chemical equations to correspond to each of the following descriptions.When solid potassium chlorate is heated, it decomposes to form solid potassium chloride and oxygen gas.
Write a balanced chemical equation for the fermentation of sucrose (C12 H22 O11 ) by yeasts in which the aqueous sugar reacts with water to form aqueous ethyl alcohol (C2 H5 OH) and carbon dioxide gas.
Write balanced chemical equations to correspond to each of the following descriptions.Solid zinc metal reacts with sulfuric acid to form hydrogen gas and an aqueous solution of zinc (II) sulfate.
Write a balanced equation for the photosynthesis reaction in which gaseous carbon dioxide and liquid water react in the presence of chlorophyll to produce aqueous glucose (C6 H12 O6) and oxygen gas.
Write balanced chemical equations to correspond to each of the following descriptions.When liquid phosphorus trichloride is added to water, it reacts to form aqueous phosphorous acid, H3PO3(aq), and aqueous hydrochloric acid.
Write a balanced chemical equation for each of the following.Solid lead(II) sulfide reacts with aqueous hydrobromic acid to form solid lead(II) bromide and dihydrogen sulfide gas.
Write balanced chemical equations to correspond to each of the following descriptions.When hydrogen sulfide gas is passed over solid hot iron (III) hydroxide, the resultant reaction produces solid iron (III) sulfide and gaseous water.
Write a balanced chemical equation for each of the following.Gaseous carbon monoxide reacts with hydrogen gas to form gaseous methane (CH4 ) and liquid water.
Write the balanced chemical equations that correspond to each of the following descriptions. You may want to reference(Pages 88 - 90)Section 3.2 while completing this problem.When sulfur trioxide gas reacts with water, a solution of sulfuric acid forms.
Write a balanced chemical equation for each of the following.Aqueous hydrochloric acid reacts with solid manganese(IV) oxide to form aqueous manganese(II) chloride, liquid water, and chlorine gas.
Write the balanced chemical equations that correspond to each of the following descriptions. You may want to reference(Pages 88 - 90)Section 3.2 while completing this problem.Boron sulfide, B2S3(s), reacts violently with water to form dissolved boric acid (H3BO3) and hydrogen sulfide gas.
Write a balanced chemical equation for each of the following.Liquid pentane (C5 H12 ) reacts with gaseous oxygen to form carbon dioxide and liquid water.
Write the balanced chemical equations that correspond to each of the following descriptions. You may want to reference(Pages 88 - 90)Section 3.2 while completing this problem.Phosphine, PH3(g), combusts in oxygen gas to form water vapor and solid tetraphosphorus decaoxide.
Write a balanced chemical equation for the reaction of aqueous sodium carbonate with aqueous copper(II) chloride to form solid copper(II) carbonate and aqueous sodium chloride.
Write the balanced chemical equations that correspond to each of the following descriptions. You may want to reference(Pages 88 - 90)Section 3.2 while completing this problem.When solid mercury(II) nitrate is heated, it decomposes to form solid mercury(II) oxide, gaseous nitrogen dioxide, and oxygen.
Write a balanced chemical equation for the reaction of aqueous potassium hydroxide with aqueous iron(III) chloride to form solid iron(III) hydroxide and aqueous potassium chloride.
Write the balanced chemical equations that correspond to each of the following descriptions. You may want to reference(Pages 88 - 90)Section 3.2 while completing this problem.Copper metal reacts with hot concentrated sulfuric acid solution to form aqueous copper(II) sulfate, sulfur dioxide gas, and water.
Write a balanced chemical equation for each reaction. You may want to reference (Pages 120 - 123)Section 3.11 while completing this problem.Solid copper reacts with solid sulfur to form solid copper(I) sulfide.
Write a balanced chemical equation for the reaction that occurs when barium carbonate decomposes into barium oxide and carbon dioxide gas when heated.
Write a balanced chemical equation for each reaction. You may want to reference (Pages 120 - 123)Section 3.11 while completing this problem.Solid iron(III) oxide reacts with hydrogen gas to form solid iron and liquid water.
Write a balanced chemical equation for the reaction that occurs when the hydrocarbon styrene, C8H8(l), is combusted in air.
Write a balanced chemical equation for each reaction. You may want to reference (Pages 120 - 123)Section 3.11 while completing this problem.Sulfur dioxide gas reacts with oxygen gas to form sulfur trioxide gas.
Write a balanced chemical equation for the reaction that occurs when dimethylether, CH3OCH3(g), is combusted in air.
Write a balanced chemical equation for each reaction. You may want to reference (Pages 120 - 123)Section 3.11 while completing this problem.Gaseous ammonia (NH3 ) reacts with gaseous oxygen to form gaseous nitrogen monoxide and gaseous water.
Potassium superoxide, KO2, is often used in oxygen masks (such as those used by firefighters) because KO2 reacts with CO2 to release molecular oxygen. Experiments indicate that 2 mol of KO2 (s) react with each mole of CO2(g).The products of the reaction are K2CO3(s) and O2(g). Write a balanced equation for the reaction between KO2 (s) and CO2 (g).
You may want to reference (Pages 88 - 90)Section 3.2 while completing this problem.Determine the balanced equation for the reaction that occurs when ethylene glycol, C2H4(OH)2, burns in air.
Ethanol can be made from the fermentation of crops and has been used as a fuel additive to gasoline.Write a balanced equation for the combustion of ethanol.
You may want to reference (Pages 120 - 123) Section 3.11 while completing this problem.Write a balanced equation for the combustion of gaseous ethane (C2H6), a minority component of natural gas, in which it combines with gaseous oxygen to form gaseous carbon dioxide and gaseous water.
You may want to reference (Pages 120 - 123) Section 3.11 while completing this problem.Enter a balanced equation for the reaction between aqueous lead(II) nitrate and aqueous potassium chloride to form solid lead(II) chloride and aqueous potassium nitrate .
You may want to reference (Pages 91 - 92) Section 3.3 while completing this problem.When a compound containing C, H, and O is completely combusted in air, what reactant besides the hydrocarbon is involved in the reaction?
You may want to reference (Pages 91 - 92) Section 3.3 while completing this problem.What is the sum of the coefficients in the balanced chemical equation for the combustion of acetone, C3H6O(l), in air?
You may want to reference (Pages 175 - 182) Section 4.9 while completing this problem.Enter a balanced equation for the complete combustion of liquid C2H5SH.
Natural gas is very abundant in many Middle Eastern oil fields. However, the costs of shipping the gas to markets in other parts of the world are high because it is necessary to liquefy the gas, which is mainly methane and thus has a boiling point at atmospheric pressure of -164 oC. One possible strategy is to oxidize the methane to methanol, CH3OH, which has a boiling point of 65 oC and can therefore be shipped more readily. Suppose that 1.07×1010 ft3 of methane at atmospheric pressure and 25 oC are oxidized to methanol.Write balanced chemical equation for the oxidation of methane to CO2(g) and H2O(l).
Natural gas is very abundant in many Middle Eastern oil fields. However, the costs of shipping the gas to markets in other parts of the world are high because it is necessary to liquefy the gas, which is mainly methane and thus has a boiling point at atmospheric pressure of -164 oC. One possible strategy is to oxidize the methane to methanol, CH3OH, which has a boiling point of 65 oC and can therefore be shipped more readily. Suppose that 1.07×1010 ft3 of methane at atmospheric pressure and 25 oC are oxidized to methanol.Write balanced chemical equation for the oxidation of methanol to CO2(g) and H2O(l).
You may want to reference (Pages 120 - 123) Section 3.11 while completing this problem.Enter a balanced equation for the reaction between solid silicon dioxide and solid carbon that produces solid silicon carbide and carbon monoxide gas.
When hydrochloric acid is poured over potassium sulfide, 43.1 mL of hydrogen sulfide gas is produced at a pressure of 754 torr and 25.8 oC.Write an equation for the gas-evolution reaction.
Aluminum sulfide reacts with water to form aluminum hydroxide and hydrogen sulfide.Write the balanced chemical equation for this reaction.
Liquid octane (C8H18), a component of gasoline, reacts with gaseous oxygen to form gaseous carbon dioxide and water vapor. Write the balanced chemical reaction for this process.
Calcium hydride reacts with water to form calcium hydroxide (aqueous) and hydrogen gas.Write a balanced chemical equation for the reaction.
You may want to reference (Pages 84 - 87)Section 3.1 while completing this problem.In the following diagram, the white spheres represent hydrogen atoms and the blue spheres represent nitrogen atoms. The two reactants combine to form a single product, ammonia, NH3, which is not shown. Write a balanced chemical equation for the reaction. Based on the equation and the contents of the left (reactants) box how many molecules should be shown in the right (products) box?
Imagine you mix 16.05 g of methane (CH4) gas and 96.00 g of oxygen (O2) gas and then ignite the mixture. After a bright flash and a loud bang, some water droplets form on the inside of the reaction vessel.Write the balanced chemical reaction for the combustion of methane.
Write a balanced chemical equation for the reaction that occurs when silver (I) oxide decomposes into silver metal and oxygen gas when heated.
Write a balanced chemical equation for the reaction that occurs when propanol, C3H7OH(l) , burns in air.        
Write a balanced chemical equation for the reaction that occurs when the gasoline additive methyl tert-butyl ether, C5H12O(l), burns in air.        
A sample of hydrogen gas is generated in a closed container by reacting 2.050 g of zinc metal with 15.0 mL of 1.00 M sulfuric acid. Write the balanced equation for the reaction.
Write a balanced equation for the reaction that occurs in each of the following cases.Potassium metal is exposed to an atmosphere of chlorine gas.
Write a balanced equation for the reaction that occurs in each of the following cases.Strontium oxide is added to water.
Ethanol (C2H5OH) is currently blended with gasoline as an automobile fuel.Write a balanced equation for the combustion of liquid ethanol in air.
Write a balanced equation for the reaction that occurs in each of the following cases.A fresh surface of lithium metal is exposed to oxygen gas.
Write a balanced equation for the reaction that occurs in each of the following cases.Sodium metal reacts with molten sulfur.
Write balanced equations for the following reactions:barium oxide with water
Write balanced equations for the following reactions:sulfur trioxide with water
Methanol (CH3OH) is used as a fuel in race cars.You may want to reference (Pages 187 - 190) Section 5.7 while completing this problem.Write a balanced equation for the combustion of liquid methanol in air, assuming H2O(g) as a product.        
Enter balanced equations for the following reactions. You may want to reference(Pages 273 - 278)Section 7.6 while completing this problem.Potassium oxide with excess water
Enter balanced equations for the following reactions. You may want to reference(Pages 273 - 278)Section 7.6 while completing this problem.Liquid diphosphorus trioxide with excess water
Enter balanced equations for the following reactions. You may want to reference(Pages 273 - 278)Section 7.6 while completing this problem.Chromium(III) oxide with dilute hydrochloric acid
Hydrogen peroxide (H2O2) decomposes in the presence of a catalyst to form water and oxygen. The catalyst is added to 5.00 mL of a hydrogen peroxide solution at 25.0 C, and 49.5 mL of gas is collected over water at a total pressure of 763.6 mmHg.Write and balance the chemical reaction (note: catalysts do not appear in balanced chemical equations).
Bismuth tribromide is soluble in acidic solution. It is formed by treating solid bismuth (III) oxide with aqueous hydrobromic acid. Write a balanced chemical equation for this reaction.
Write the chemical equation for the following reaction:Sulfur dioxide gas reacts with oxygen gas to form sulfur trioxide gas.
Aqueous nitric acid and aqueous ammonia react.Express your answer as a balanced chemical equation. Identify all of the phases in your answer.
Balance each chemical equation:a. Na2S(aq) + Cu(NO3)2(aq) → NaNO3(aq) + CuS(s)
Write the balanced chemical equation for the following reaction. Phases are optional.Solid iron(III) oxide reacts with hydrogen gas to form solid iron and liquid water.
Balance  the following equations by inserting coefficients as needed.— Li3N  +  — H2O →  — LiOH  +  — NH 3— ZnO  + — CO → — Zn  + — CO2— SO2  +  — O2 →  — SO3
Write the balanced chemical equation for the reaction shown here. 
Write the balanced chemical equations.Nitric acid forms when gaseous nitrogen dioxide reacts with gaseous oxygen and liquid water.
For each of the following equations, write the chemical formulas and balance the equation. Try to indicate all the physical states (solid, liquid, gas) as well.a) potassium + water → potassium hydroxide + hydrogen  b) potassium hydride + water → potassium hydroxide + hydrogen  c) silicon dioxide + carbon → silicon carbide + carbon monoxide  d) silicon dioxide + hydrogen fluoride → silicon tetrafluoride + water  e) phosphorus + chlorine → phosphorous tetrachloride
Write the balanced chemical equation: Aqueous hydrochloric acid reacts with solid manganese(IV) oxide to form aqueous manganese(II) chloride, liquid water, and chlorine gas.
Balance the equation. HC2H3O2(aq) +    Ba(OH)2(aq) →    H2O(l) +    Ba(C2H3O2)2(aq)
Balance each chemical equation:b. N2H4(l) → NH3(g) + N2(g)
What is the coefficient of O 2 when the following equation is properly balanced with the smallest set of whole numbers?   C3H7OH(I) + O2(g) → CO2 + H2O A) 5 B) 17 C) 9 D) 6 E) 2
Balance each chemical equation:c. HCl(aq) + O2(g) → H2O(l) + Cl2(g)
Balance each chemical equation:d. FeS(s) + HCl(aq) → FeCl2(aq) + H2S(g)
What is the stoichiometric coefficient for oxygen gas (O2) when the following equation is balanced using the lowest, whole-number coefficients? _____C3H8(g) + _____ O2(g)  →  _____ CO2(g) + _____ H2O(l)   A) 9               B) 7             C) 5                 D) 3                 E) 1
Aluminum metal reacts with iron(II) sulfide to form aluminum sulfide and iron metal. What is the stoichiometric coefficient for aluminum when the chemical equation is balanced using the lowest, whole-number stoichiometric coefficients?a. 1b. 2c. 3d. 4
Balance this equation:KOH+H3PO4 → K3PO4+H2O 
When iron rusts, solid iron reacts with gaseous oxygen to form solid iron (III) oxide. Write a balanced chemical equation for the reaction.  Express as a chemical equation, identify all the phases in the answer.
Balance the following equation: Ba + H2O → Ba(OH)2 + H2
Write a balanced equation to show the reaction of aqueous aluminum acetate with aqueous ammonium phosphate to form solid aluminum phosphate and aqueous ammonium acetate.A) Al(C2H3O2)2(aq) + (NH4)2PO4(aq) → AlPO4(s) + 2 NH4C2H3O2(aq)B) Al(C2H3O2)2(aq) + (NH3)2PO4(aq) → AlPO4(s) + 2 NH3C2H3O2(aq)C) Al(CO3)2(aq) + (NH3)2PO4(aq) → AlPO4(s) + 2 NH3CO3(aq)D) Al(C2H3O2)3(aq) + (NH4)3PO4(aq) → AlPO4(s) + 3 NH4C2H3O2(aq)E) Al(CO2)3(aq) + (NH4)3PO3(aq) → AlPO3(s) + 3 NH4CO2(aq)
Balance the following equations by inserting coefficients as needed.a.  — C3H8 + — O2 → — CO2 + — H2Ob.  — P4O10 +  — H2O →  — H3PO4  
Determine the balanced chemical equation for this reaction.C8H18(g) + O2(g) → CO2(g) + H2O(g)
How do you balance this equation? NaOH + H2O → Na + OH 
Balance the following equation: B2O3(s) + HF(l) → BF3(g) + H2O(l) A)  B2O3 (s) + 6HF(l) → 2BF3 (g) + 3H2O(l) B)  B2O3 (s) + H6F6(l) → B2F6(g) + H6O3 (l) C)  B2O3 (s) + 2HF(l) → 2BF3 (g) + H2O(l) D)  B2O3 (s) + 3HF(l) → 2BF3 (g) + 3H2O(l) E)  B2O3 (s) + 6HF(l) → 2BF3 (g) + 6H2O(l)
What is the coefficient of H2O when the following equation is properly balanced with the smallest set of whole numbers?  ___ Na + ___ H2O → ___ NaOH + ___ H2 A)  1                       B)  2                       C)  3                       D)  4                      E)  5
What is the coefficient of H2O when the following equation is properly balanced with the smallest set of whole numbers?                                           ___ Al4C3 + ___ H2O → ___ Al(OH)3 + ___ CH4 A)  3                       B)  4                       C)  6                       D)  12                    E)  24
Write the chemical formulas for the following reaction. Do not worry about balancing or states:Sulfurous acid reacts with barium hydroxide to form water and barium sulfite.
Complete and balance each of the following equations for combustion reactions.a. C(s)+O2(g)→Express your answer as a chemical equation. Identify all of the phases in your answer.b. CS2(s)+O2(g) →Express your answer as a chemical equation. Identify all of the phases in your answer.c. CH4O(l)+O2(g) →Express your answer as a chemical equation. Identify all of the phases in your answer. 
When the chemical equation below is balanced with the smallest INTEGER coefficients, the sum of the coefficients is: (H3C)2PCH2N(CH3)2 + O2 → CO2 + H3PO4 + N2 + H2O a. 13 b. 91 c. 35 d. 41 e. 33
The following equation is not balancedCaSO4 + AlCl3 → CaCl2 + Al2(SO4)3What number should be placed in front of CaSO 4 to give the same total number of sulfate ions on each side of the equation?
When the chemical equation FeS + O2 → FeO + SO2 is balanced with the smallest integral coefficients, the coefficient of O 2 is: a. 3 b. 2 c. 4 d. 8 e. 5
The reaction of calcium with elemental chlorine yields calcium chloride. Write a balanced chemical equation for this reaction.a) Ca(s) + Cl2(g) → CaCl(s) + Cl(g)b) Ca(s) + Cl2(g) → CaCl2(s)c) Ca(s) + 2 Cl2(g) → CaCl4(s)d) 2 Ca(s) + Cl2(g) → 2 CaCl(s)e) 4 Ca(s) + Cl2(g) → 2 Ca2Cl(s)
Examine the following unbalanced chemical equation: CO2 + C → COWhich of the following is the correctly balanced form of this equation? a. CO2 + C → C2O b. CO2 + C → 2CO c. 2CO2 + C → CO d. CO2 + C2 → CO
Which one of the following chemical equations is balanced? a. 2Na + S → 2NaS b. NH3 + H2O → 2NH4OH c. KOH + H2SO4 → KHSO4 + H2O d. 2NaCl + H2SO4 → HCl + NaSO4
Balance the following equations by inserting coefficients as needed.a. CaCO3 + HCl → CaCl2 + CO2 + H2Ob. C6H12O2 + O2 → CO2 + H2O
Determine the balanced chemical equation for this reaction. C8H18(g) + O2(g) → CO2(g) + H2O(g)
Write a balanced equation to show the reaction of gaseous ethane with gaseous oxygen to form carbon monoxide gas and water vapor.A) 2 C2H6 (g) + 7 O2 (g) → 4 CO2 (g) + 6 H2O (g)B) C2H6 (g) + 5 O (g) → 2 CO (g) + 3 H2O (g)C) 2 C2H6 (g) + 5 O2 (g) → 4 CO (g) + 6 H2O (g)D) C2H6 (g) + 7 O (g) → 2 CO2 (g) + 3 H2O (g)E) 2 CH3 (g) + 5 O (g) → 2 CO (g) + 3 H2O (g)
Write a balanced equation to show the reaction of aqueous aluminum acetate with aqueous ammonium phosphate to form solid aluminum phosphate and aqueous ammonium acetate.A) Al(C2H3O2)2 (aq) + (NH4)2PO4 (aq) → AlPO4 (s) + 2 NH4C2H3O3 (aq)B) Al(C2H3O2)2 (aq) + (NH3)2PO4 (aq) → AlPO4 (s) + 2 NH3C2H3O3 (aq)C) Al(CO3)2 (aq) + (NH3)2PO4 (aq) → AlPO4 (s) + 2 NH3CO3 (aq)D) Al(C2H3O2)3 (aq) + (NH4)3PO4 (aq) → AlPO4 (s) + 3 NH4C2H3O3 (aq)E) Al(CO2)3 (aq) + (NH4)3PO3 (aq) → AlPO3 (s) + 3 NH4CO2 (aq)
Write the balanced chemical formula for the reaction in which the reactant potassium chlorate is broken down into two products: potassium chloride and oxygen.
Nitric oxide gas reacts with hydrogen gas to form ammonia gas and water vapor. What is the balanced equation?
Liquid octane reacts with oxygen gas to form carbon dioxide gas and water vapor. What is the balanced chemical equation?
Give the balanced equation for each of the following.a. The combustion of ethanol (C2H5OH) forms carbon dioxide and water vapor. A combustion reaction refers to a reaction of a substance with oxygen gas.
Give the balanced equation for each of the following.b. Aqueous solutions of lead(II) nitrate and sodium phosphate are mixed, resulting in the precipitate formation of lead(II) phosphate with aqueous sodium nitrate as the other product.
Give the balanced equation for each of the following.c. Solid zinc reacts with aqueous HCl to form aqueous zinc chloride and hydrogen gas.
Give the balanced equation for each of the following.d. Aqueous strontium hydroxide reacts with aqueous hydrobromic acid to produce water and aqueous strontium bromide. 
Balance the following equations:a. Ca(OH)2(aq) + H3PO4(aq) → H2O(l) + Ca3(PO4)2(s) 
Balance the following equations:b. Al(OH)3(s) + HCl(aq) → AlCl3(aq) + H2O(l) 
Balance the following equations:c. AgNO3(aq) + H2SO4(aq) → Ag2SO4(s) + HNO3(aq) 
Balance each of the following chemical equations.a. KO2(s) + H2O(l) → KOH(aq) + O2(g) + H2O2(aq) 
Balance the following equation: K2CrO4 + Na 2SO3 + HCl →  KCl + Na 2SO4 + CrCl3 + H2O Enter the coefficients for each compound seperated by commas, in the order in which they appear in the equation.
Balance each of the following chemical equations.b. Fe2O3(s) + HNO3(aq) → Fe(NO3)3(aq) + H2O(l) 
Balance each of the following chemical equations.c. NH3(g) + O2(g) → NO(g) + H2O(g) 
Balance each of the following chemical equations.d. PCl5(l) + H2O(l) → H3PO4(aq) + HCl(g) 
Balance each of the following chemical equations.e. CaO(s) + C(s) → CaC2(s) + CO2(g) 
Balance each of the following chemical equations.f. MoS2(s) + O2(g) → MoO3(s) + SO2(g)
Balance each of the following chemical equations.g. FeCO3(s) + H2CO3(aq) → Fe(HCO3)2(aq)
When the chemical reaction representing the complete combustion of acetic acid, C2H4O2, is balanced with the smallest integer coefficients, the sum of the coefficients in the balanced equation is: A. 9 B. 7 C. 2 D. 4 E. 5
Sulfuric acid is a component of acid rain formed when gaseous sulfur dioxide pollutant reacts with gaseous oxygen and liquid water to form aqueous sulfuric acid. Write a balanced chemical equation for this reaction. 
When iron rusts, solid iron reacts with gaseous oxygen to form solid iron(III) oxide. What is the balanced chemical equation?
Nitric acid is a component of acid rain that forms when gaseous nitrogen dioxide pollutant reacts with gaseous oxygen and liquid water to form aqueous nitric acid. Write a balanced chemical equation for this reaction. 
Write the described reaction as a balanced reaction equation: “Lead(II)nitrate solution is added to potassium iodide solution, which results in formation of solid lead(II)iodide while potassium nitrate remains in solution.”a) PbNO3(soln) + KI(soln) → PbI(solid) + KNO3(soln)b) Pb(NO3)2 + 2KI → 2PbI + 2KNO3c) Pb(NO3)2(aq) + KI2(s) → PbI2(s) + K(NO3)2(aq)d) Pb(NO2)(aq) + 2KI(aq) → PbK 2(s) + I2(NO2)(aq)e) Pb(NO3)2(aq) + 2KI(aq) → PbI 2(s) + 2KNO3(aq)
In a popular classroom demonstration, solid sodium is added to liquid water and reacts to produce hydrogen gas and aqueous sodium hydroxide. Write a balanced chemical equation for this reaction. 
One of relatively few reactions that takes place directly between two solids at room temperature isBa(OH)2 • 8H2O(s) + NH4SCN(s) → Ba(SCN)2(s) + H2O(l) + NH3(g)In this equation, the • 8H2O in Ba(OH) 2 • 8H2O indicates the presence of eight water molecules. This compound is called barium hydroxide octahydrate.a. Balance the equation.
When iron rusts, solid iron reacts with gaseous oxygen to form solid iron(III) oxide. Write a balanced chemical equation for this reaction. 
Write a balanced chemical equation for the fermentation of sucrose (C12H22O11) by yeasts in which the aqueous sugar reacts with water to form aqueous ethyl alcohol (C2H5OH) and carbon dioxide gas
After balancing the following reaction, what are the coefficients for H 2O and NaAu(CN)2, respectively? __ Au + __ NaCN + __ O2 + __ H2O → __ NaAu(CN)2 + __ NaOH A) 1, 3 B) 2, 4 C) 1, 4 D) 3, 2 E) 3, 1
Write a balanced equation for the photosynthesis reaction in which gaseous carbon dioxide and liquid water react in the presence of chlorophyll to produce aqueous glucose (C6H12O6) and oxygen gas.
Balance the following equation and select the correct coefficients for NO2 and N2, respectively: __ NH3 (g) + __ NO2 (g) → __ N2 (g) + __ H2O (l) a) 3, 5 b) 5, 9 c) 4, 3 d) 6, 7 e) 7, 9
Write a balanced chemical equation for each reaction: a. Solid copper reacts with solid sulfur to form solid copper (I) sulfide.
Write a balanced chemical equation for each reaction: b. Solid iron (III) oxide reacts with hydrogen gas to form solid iron and liquid water.
Write a balanced chemical equation for each reaction: c. Sulfur dioxide gas reacts with oxygen gas to form sulfur trioxide gas.
Write a balanced chemical equation for each reaction: d. Gaseous ammonia (NH3) reacts with gaseous oxygen to form gaseous nitrogen monoxide and gaseous water.
Write a  balanced equation to show the reaction of sulfurous acid with lithium hydroxide to form water and lithium sulfite.a. H2SO4 (aq) + LiOH (aq) → H2O (l) + Li 2SO4 (aq)b. H2SO3 (aq) + 2 LiOH (aq) → 2 H 2O (l) + Li2SO3 (aq)c. HSO3 (aq) + LiOH (aq) → H 2O (l) + LiSO3 (aq)d. HSO4 (aq) + LiOH (aq) → H 2O (l) + LiSO4 (aq)e. H2S (aq) + 2 LiOH (aq) → 2 H 2O (l) + Li 2S (aq) 
Write the balanced equation for the reaction of sodium hydroxide with sulfuric acid to give water and sodium sulfate.
When hydrogen peroxide (H2O2) decomposes, it forms oxygen and hydrogen gas:  ____ H2O2 → _____ O2 + _____ H2O When this equation is balanced, what is the coefficient for oxygen? a. 1 b. 2 c. 3 d. 4  
Write a balanced equation to show the reaction of aqueous aluminum acetate with aqueous ammonium phosphate to form solid aluminum phospate and aqueous ammonium acetate.A) Al(C2H3O2)2(aq) + (NH3)2PO4(aq) → AlPO4(s) + 2NH3C2H3O2(aq)B) Al(C2H3O2)2(aq) + (NH4)2PO4(aq) → AlPO4(s) + 2NH4C2H3O2(aq)C) Al(CO2)3(aq) + (NH4)3PO3(aq) → AlPO3(s) + 3NH4CO2(aq)D) Al(C2H3O2)3(aq) + (NH4)3PO4(aq) → AlPO4(s) + 3NH4C2H3O2(aq)E) Al(CO2)3(aq) + (NH3)2PO4(aq) → AlPO4(s) + 2NH3CO3(aq)
Write the chemical equation for the reaction:Solid iron(III) oxide reacts with carbon monoxide gas to form solid iron and carbon dioxide gas.
Balance the following equation:  K2CrO4 +   Na2SO3 +   HCl →   KCl +   Na 2SO4 +   CrCl3 +   H2O
Balance the following equations. a.  ___ C3H8O(l) + ____ O2(g) → ________ CO2(g) + ________ H2O(l) b. _____ PH3(g) + ____ O2(g) → _______ P4O10(s) + _______ H2O(g) c. ____ B2O3(s) + _____ HF(l) → _______ BF3(g) + _________ H2O(l) d) ____Cu2O(s) + ______O2(g) → ______CuO(s) e) ___CaCl2(aq) + ____K2CO3(aq) → ___ KCl(aq) + ____CaCO3(aq) f) ___ MgO(s) + ___ Fe(s) → ___ Fe2O3(s) + ___ Mg(s)  
Write a balanced chemical equation for each of the following.a. Aqueous hydrogen chloride reacts with oxygen gas to form chlorine gas and liquid water.b. Liquid octane reacts with oxygen gas to form carbon dioxide gas and water vapor.c. Nitric oxide gas reacts with hydrogen gas to form ammonia gas and water vapor.d. Solid iron(III) oxide reacts with carbon monoxide gas to form solid iron and carbon dioxide gas.
Balance the following equations.a. H2 + O2 → H2Ob. Mg + O2 → MgOc. SF4 + H2O → SO2 + HFd. P4 + O2 → P2O5e. C3H8 + O2 → CO2 + H2O
Write a balanced chemical equation for each of the following. Express your answer as a chemical equation. Identify all of the phases in your answer.a. Solid copper reacts with solid sulfur to form solid copper(I) sulfide.b. Liquid octane reacts with oxygen gas to form carbon dioxide gas and water vapor.c. Sulfur dioxide gas reacts with oxygen gas to form sulfur trioxide gas.d. Solid iron(III) oxide reacts with carbon monoxide gas to form solid iron and carbon dioxide gas.
Write balanced equation for the following by inserting the correct coefficients in the blanks:(c) __B2O3(s) + __NaOH(aq) ⟶__Na3BO3(aq) + __H2O(l)
Write balanced equation for the following by inserting the correct coefficients in the blanks:(d) __CH3NH2(g) + __O2(g) ⟶__CO2(g) + __H2O(g) + __N2(g)
Use the following equations to answer the next four questions:i. H2O(s) ⟶ H2O(l)ii. Na+(aq) + Cl−(aq) + Ag+(aq) + NO3−(aq) ⟶ AgCl(s) + Na+(aq) + NO3−(aq)iii. CH3OH(g) + O2(g) ⟶ CO2(g) + H2O(g)iv. 2H2O(l) ⟶ 2H2(g) + O2(g)v. H+(aq) + OH−(aq) ⟶ H2O(l)(c) Which equation is not balanced?
Write balanced equation for the following by inserting the correct coefficients in the blanks:(a) __Cu(NO3)2(aq) + __KOH(aq) ⟶__Cu(OH)2(s) + __KNO3(aq)
Write balanced equation for the following by inserting the correct coefficients in the blanks:(b) __BCl3(g) + __H2O(l) ⟶__H3(BO3(s) + __HCl(g)
Write balanced equation for the following by inserting the correct coefficients in the blanks:(c) __CaSiO3(s) + __HF(g) ⟶__SiF4(g) + __CaF2(s) + __H2O(l)
Write balanced equation for the following by inserting the correct coefficients in the blanks:(d) __(CN)2 (g) + __H2O(l) ⟶__H2C2O4(aq) + __NH3(g)
Write balanced equation for  the following by inserting the correct coefficients in the blanks:(a) __SO2(g) + __O2(g) ⟶__SO3(g)
Write balanced equation for  the following by inserting the correct coefficients in the blanks:(b) __Sc2O3(s) + __H2O(l) ⟶__Sc(OH)3(s)
One of relatively few reactions that takes place directly between two solids at room temperature isBa(OH)2 • 8 H 2O (s) + NH 4SCN (s) → Ba(SCN) 2 (s) + H 2O (l) + NH 3 (g)In this equation, the • 8 H 2O in Ba(OH) 2 • 8 H2O indicates the presence of eight water molecules. This compound is called barium hydroxide octahydrate. Balance the equation.
Write balanced equation for the following by inserting the correct coefficients in the blanks:(c) __H3PO4(aq) + __NaOH(aq) ⟶__Na2HPO4(aq) + __H2O(l)
Write balanced equation for  the following by inserting the correct coefficients in the blanks:(d) __C6H10O5(s) + __O2(g) ⟶__CO2(g) + __H2O(g)
Write balanced equation for  the following by inserting the correct coefficients in the blanks:(a) __As4S6(s) + __O2(g) ⟶__As4O6(s) + __SO2(g)
Write balanced equation for  the following by inserting the correct coefficients in the blanks:(b) __Ca3(PO4)2(s) + __SiO2(s) + __C(s) ⟶__P4(g) + __CaSiO3(l) + __CO(g)
Write balanced equation for  the following by inserting the correct coefficients in the blanks:(c) __Fe(s) + __H2O(g) ⟶__Fe3O4(s) + __H2(g)
Write balanced equation for  the following by inserting the correct coefficients in the blanks:(d) __S2Cl2(l) + __NH3(g) ⟶__S4N4(s) + __S8(s) + __NH4Cl(s)
Which of the following statements about chemical equations is(are)  true?a. When balancing a chemical equation, you can never change the coefficient in front of any chemical formula.b. The coefficients in a balanced chemical equation refer to the number of grams of reactants and products.c. In a chemical equation, the reactants are on the right and the products are on the left.d. When balancing a chemical equation, you can never change the subscripts of any chemical formula.e. In chemical reactions, matter is neither created nor destroyed so a chemical equation must have the same number of atoms on both sides of the equation.
What does it mean to say an equation is balanced? Why is it important for an equation to be balanced?
Balance the following equations:(a) PCl5(s) + H2O(l) ⟶ POCl3(l) + HCl(aq)
Balance the following equations:(b) Cu(s) + HNO3(aq) ⟶ Cu(NO3)2(aq) + H2O(l) + NO(g)
Balance the following equations:(c) H2(g) + I2(s) ⟶ HI(s)
Balance the following equations:(d) Fe(s) + O2(g) ⟶ Fe2O3(s)
Balance the following equations:(e) Na(s) + H2O(l) ⟶ NaOH(aq) + H2(g)
Balance the following equations:(f) (NH4)2Cr2O7(s) ⟶ Cr2O3(s) + N2(g) + H2O(g)
Balance the following equations:(g) P4(s) + Cl2(g) ⟶ PCl3(l)
Balance the following equations:(h) PtCl4(s) ⟶ Pt(s) + Cl2(g)
Consider the unbalanced equation for the combustion of hexane:C6H14(g) + O2(g) → CO2(g) + H2O(g)Balance the equation.
Consider the unbalanced equation for the neutralization of acetic acid:HC2H3O2(aq) + Ba(OH)2(aq) → H2O(l) + Ba(C2H3O2)2(aq)Balance the equation.
Balance the following equations:(a) Ag(s) + H2S(g) + O2(g) ⟶ Ag2S(s) + H2O(l)
Iron oxide ores, commonly a mixture of FeO and Fe2O3, are given the general formula Fe3O4. They yield elemental iron when heated to a very high temperature with either carbon monoxide or elemental hydrogen. Balance the following equations for these processes:Fe3O4(s) + H2(g) → Fe(s) + H2O(g)Fe3O4(s) + CO(g) → Fe(s) + CO2(g)
Balance the following equation:Ca(OH) (aq) + H3PO4 (aq) → H2O (l) + Ca3(PO4)2 (s)
Balance the following equation:Al(OH)3 (s) + HCl (aq) → AlCl3 (aq) + H2O (l)
Balance the following equations:(b) P4(s) + O2(g) ⟶ P4O10(s)
Balance the following equation:AgNO3 (aq) + H2SO4 (aq) → Ag2SO4 (s) + HNO3 (aq)
Balance the following equation:KO2 (s) + H2O (l) → KOH (aq) + O2 (g) + H2O2 (aq)
Balance the following equation:Fe2O3 (s) + HNO3 (aq) → Fe(NO3)3 (aq) + H2O (l)
Balance the following equations:(c) Pb(s) + H2O(l) + O2(g) ⟶ Pb(OH)2(s)
Balance the following equation:NH3 (g) + O2 (g) → NO (g) + H2O (g)
Balance the following equation:PCl5 (l) + H2O (l) → H3PO4 (aq) + HCl (g)
Balance the following equation:CaO (s) + C (s) → CaC2 (s) + CO2 (g)
Balance the following equation:MoS2 (s) + O2 (g) → MoO3 (s) + SO2 (g)
Balance the following equations:(d) Fe(s) + H2O(l) ⟶ Fe3O4(s) + H2(g)
Balance the following equation:FeCO3 (s) + H2CO3 (aq) → Fe(HCO3)2 (aq)
Balance the following equations representing combustion reactions:
Balance the following equation representing combustion reactions:C12H22O11 (s) + O2 (g) → CO2 (g) + H2O (g)
Balance the following equation representing combustion reactions:Fe (s) + O2 (g) → Fe2O3 (s)
Balance the following equation representing combustion reactions:FeO (s) + O2 (g) → Fe2O3 (s)
Balance the following equation:Cr (s) + S 8 (s) → Cr2S3 (s)
Balance the following equation:NaHCO3 (s) —heat→ Na2CO3 (s) + CO2 (g) + H2O (l)
Balance the following equation:KClO3 (s) —heat→ KCl (s) + O2 (g)
Balance the following equations:(e) Sc2O3(s) + SO3(l) ⟶ Sc2(SO4)3(s)
Balance the following equation:Eu (s) + HF (g) → EuF3 (s) + H2 (g)
Silicon is produced for the chemical and electronics industries by the following reactions. Give the balanced equation for the reaction:SiO2 (s) + C (s) → Si (s) + CO (g)
Silicon is produced for the chemical and electronics industries by the following reactions. Give the balanced equation for the reaction:Na2SiF6 (s) + Na (s) → Si (s) + NaF (s)
Balance the following equations:(f) Ca3(PO4)2(aq) + H3PO4(aq) ⟶ Ca(H2PO4)2(aq)
Balance the following equations:(g) Al(s) + H2SO4(aq) ⟶ Al2(SO4)3(s) + H2(g)
Balance the following equations:(h) TiCl4(s) + H2O(g) ⟶ TiO2(s) + HCl(g)
Glass is a mixture of several compounds, but a major constituent of most glass is calcium silicate, CaSiO3. Glass can be etched by treatment with hydrofluoric acid; HF attacks the calcium silicate of the glass, producing gaseous and water-soluble products (which can be removed by washing the glass). For example, the volumetric glassware in chemistry laboratories is often graduated by using this process. Balance the following equation for the reaction of hydrofluoric acid with calcium silicate.CaSiO3 (s) + HF (aq) → CaF2 (aq) + SiF4 (g) + H2O (l)
Write balanced equation for the following by inserting the correct coefficients in the blanks:(a) __Cu(s) + __S8(s) ⟶__Cu2S(s)
Write balanced equation for the following by inserting the correct coefficients in the blanks:(b) __P4O10(s) + __H2O(l) ⟶__ H3PO4(l)
Hydrogen cyanide is prepared commercially by the reaction of methane, CH4(g), ammonia, NH3(g), and oxygen, O2(g), at high temperature. The other product is gaseous water.a. Write a chemical equation for the reaction.
Write a balanced molecular equation describing each of the following chemical reactions.(b) Gaseous butane, C4H10, reacts with diatomic oxygen gas to yield gaseous carbon dioxide and water vapor.
Write a balanced molecular equation describing each of the following chemical reactions.(c) Aqueous solutions of magnesium chloride and sodium hydroxide react to produce solid magnesium hydroxide and aqueous sodium chloride.
Write a balanced molecular equation describing each of the following chemical reactions.(d) Water vapor reacts with sodium metal to produce solid sodium hydroxide and hydrogen gas.
Write a balanced equation describing each of the following chemical reactions.(a) Solid potassium chlorate, KClO3, decomposes to form solid potassium chloride and diatomic oxygen gas.
A propane tank on a home barbeque contains 11.3 x 103 g of propane. Write the balanced chemical reaction for the combustion of gaseous propane (C3H8) to form water vapor and gaseous carbon dioxide.
Convert the following into balanced equations:When gallium metal is heated in oxygen gas, it melts and forms solid gallium(III) oxide.
Convert the following into balanced equations:Liquid hexane burns in oxygen gas to form carbon dioxide gas and water vapor.
Convert the following into balanced equations:When solutions of calcium chloride and sodium phosphate are mixed, solid calcium phosphate forms and sodium chloride remains in solution.
Convert the following into balanced equations:When lead(II) nitrate solution is added to potassium iodide solution, solid lead(II) iodide forms and potassium nitrate solution remains.
Convert the following into balanced equations:Liquid disilicon hexachloride reacts with water to form solid silicon dioxide, hydrogen chloride gas, and hydrogen gas.
Gaseous dichlorine monoxide decomposes readily to chlorine (green) and oxygen (red) gases.(b) Write the balanced equation for the decomposition.
Write a balanced equation describing each of the following chemical reactions.(b) Solid aluminum metal reacts with solid diatomic iodine to form solid Al 2I6.
Convert the following into balanced equations:When nitrogen dioxide is bubbled into water, a solution of nitric acid forms and gaseous nitrogen monoxide is eleased.
Consider the decomposition of liquid hydrogen peroxide (H2O2) to form water and oxygen. Write the balanced chemical equation for the decomposition of hydrogen peroxide to form water and oxygen. (Write the equation such that the coefficient on oxygen is 1.)
Write a balanced equation describing each of the following chemical reactions.(c) When solid sodium chloride is added to aqueous sulfuric acid, hydrogen chloride gas and aqueous sodium sulfate are produced.
Write a balanced equation describing each of the following chemical reactions.(d) Aqueous solutions of phosphoric acid and potassium hydroxide react to produce aqueous potassium dihydrogen phosphate and liquid water.
Loss of atmospheric ozone has led to an ozone “hole” over Antarctica. The loss occurs in part through three consecutive steps:(1) Chlorine atoms react with ozone (O3) to form chlorine monoxide and molecular oxygen.(2) Chlorine monoxide forms ClOOCl.(3) ClOOCl absorbs sunlight and breaks into chlorine atoms and molecular oxygen.(a) Write a balanced equation for each step.
Loss of atmospheric ozone has led to an ozone “hole” over Antarctica. The loss occurs in part through three consecutive steps:(1) Chlorine atoms react with ozone (O3) to form chlorine monoxide and molecular oxygen.(2) Chlorine monoxide forms ClOOCl.(3) ClOOCl absorbs sunlight and breaks into chlorine atoms and molecular oxygen.(b) Write an overall balanced equation for the sequence.
Colorful fireworks often involve the decomposition of barium nitrate and potassium chlorate and the reaction of the metals magnesium, aluminum, and iron with oxygen.(b) The decomposition of solid potassium chlorate leads to the formation of solid potassium chloride and diatomic oxygen gas. Write an equation for the reaction.
Colorful fireworks often involve the decomposition of barium nitrate and potassium chlorate and the reaction of the metals magnesium, aluminum, and iron with oxygen.(c) The decomposition of solid barium nitrate leads to the formation of solid barium oxide, diatomic nitrogen gas, and diatomic oxygen gas. Write an equation for the reaction.
During photosynthesis, plants use energy from sunlight to form glucose, C6H12O6(s), and oxygen from carbon dioxide and water. Write a balanced equation for photosynthesis.
Methanol (CH3OH) has been suggested as a fuel to replace gasoline. Write a balanced equation for the combustion of methanol.
Colorful fireworks often involve the decomposition of barium nitrate and potassium chlorate and the reaction of the metals magnesium, aluminum, and iron with oxygen.(d) Write separate equations for the reactions of the solid metals magnesium, aluminum, and iron with diatomic oxygen gas to yield the corresponding metal oxides. (Assume the iron oxide contains Fe3+ ions.)
Hydroxyapatite, Ca5(PO4)3(OH), is the main mineral component of dental enamel, dentin, and bone. Coating the compound on metallic implants (such as titanium alloys and stainless steels) helps the body accept the implant. When placed in bone voids, the powder encourages natural bone to grow into the void. Hydroxyapatite is prepared by adding aqueous phosphoric acid to a dilute slurry of calcium hydroxide. (a) Write a balanced equation for this preparation.
Solid iodine trichloride is prepared in two steps: first, a reaction between solid iodine and gaseous chlorine to form solid iodine monochloride; second, treatment of the solid with more chlorine gas.(a) Write a balanced equation for each step.
Solid iodine trichloride is prepared in two steps: first, a reaction between solid iodine and gaseous chlorine to form solid iodine monochloride; second, treatment of the solid with more chlorine gas. (b) Write a balanced equation for the overall reaction.
Palmitic acid (C16H32O2) is a dietary fat found in beef and butter. The caloric content of palmitic acid is typical of fats in general. Write a balanced equation for the complete combustion of solid palmitic acid. Use H2O(l) in the balanced chemical equation because the metabolism of these compounds produces liquid water.
Write a balanced equation for the complete combustion of table sugar (sucrose, C12H22O11). Use H2O(l) in the balanced chemical equation because the metabolism of this compound produces liquid water.
Lead can be prepared from galena [lead(II) sulfide] by first roasting the galena in oxygen gas to form lead(II) oxide and sulfur dioxide. Heating the metal oxide with more galena forms the molten metal and more sulfur dioxide.(a) Write a balanced equation for each step.
Lead can be prepared from galena [lead(II) sulfide] by first roasting the galena in oxygen gas to form lead(II) oxide and sulfur dioxide. Heating the metal oxide with more galena forms the molten metal and more sulfur dioxide.(b) Write an overall balanced equation for the process.
Various nitrogen oxides, as well as sulfur oxides, contribute to acidic rainfall through complex reaction sequences. Nitrogen and oxygen combine during the high-temperature combustion of fuels in air to form nitrogen monoxide gas, which reacts with more oxygen to form nitrogen dioxide gas. In contact with water vapor, nitrogen dioxide forms aqueous nitric acid and more nitrogen monoxide. (a) Write balanced equations for these reactions.
You may want to reference (Pages 248 - 284) Chapter 6 while completing this problem.Hydrogen and methanol have both been proposed as alternatives to hydrocarbon fuels. Enter a balanced reaction for the complete combustion of hydrogen.
You may want to reference (Pages 248 - 284) Chapter 6 while completing this problem.Hydrogen and methanol have both been proposed as alternatives to hydrocarbon fuels. Enter a balanced reaction for the complete combustion of methanol.
Propane, C3H8, is a hydrocarbon that is commonly used as a fuel.Write a balanced equation for the complete combustion of propane gas.
Aqueous hydrogen fluoride (hydrofluoric acid) is used to etch glass and to analyze minerals for their silicon content. Hydrogen fluoride will also react with sand (silicon dioxide).(a) Write an equation for the reaction of solid silicon dioxide with hydrofluoric acid to yield gaseous silicon tetrafluoride and liquid water.
A novel process for obtaining magnesium from sea water involves several reactions. Write a balanced chemical equation for each step of the process.(a) The first step is the decomposition of solid calcium carbonate from seashells to form solid calcium oxide and gaseous carbon dioxide.
A novel process for obtaining magnesium from sea water involves several reactions. Write a balanced chemical equation for each step of the process.(b) The second step is the formation of solid calcium hydroxide as the only product from the reaction of the solid calcium oxide with liquid water.
Give the balanced equation for the following chemical reaction: Glucose (C6H12O6) reacts with oxygen gas to produce gaseous carbon dioxide and water vapor.
Give the balanced equation for the following chemical reaction: Solid iron(III) sulfide reacts with gaseous hydrogen chloride to form solid iron(III) chloride and hydrogen sulfide gas.
Great Lakes Chemical Company produces bromine, Br 2, from bromide salts such as NaBr, in Arkansas brine by treating the brine with chlorine gas. Write a balanced equation for the reaction of NaBr with Cl2.
Give the balanced equation for the following chemical reaction: Carbon disulfide liquid reacts with ammonia gas to produce hydrogen sulfide gas and solid ammonium thiocyanate (NH4SCN).
In a common experiment in the general chemistry laboratory, magnesium metal is heated in air to produce MgO. MgO is a white solid, but in these experiments it often looks gray, due to small amounts of Mg3N2, a compound formed as some of the magnesium reacts with nitrogen. Write a balanced equation for each reaction.
Give the balanced equation for the following chemical reaction: The combustion of ethanol (C2H5OH) forms carbon dioxide and water vapor. A combustion reaction refers to a reaction of a substance with oxygen gas.
A novel process for obtaining magnesium from sea water involves several reactions. Write a balanced chemical equation for each step of the process.(c) Solid calcium hydroxide is then added to the seawater, reacting with dissolved magnesium chloride to yield solid magnesium hydroxide and aqueous calcium chloride.
Give the balanced equation for the following chemical reaction: Aqueous solutions of lead(II) nitrate and sodium phosphate are mixed, resulting in the precipitate formation of lead(II) phosphate with aqueous sodium nitrate as the other product.
Give the balanced equation for the following chemical reaction: Solid zinc reacts with aqueous HCl to form aqueous zinc chloride and hydrogen gas.
A novel process for obtaining magnesium from sea water involves several reactions. Write a balanced chemical equation for each step of the process.(d) The solid magnesium hydroxide is added to a hydrochloric acid solution, producing dissolved magnesium chloride and liquid water.
Give the balanced equation for the following chemical reaction: Aqueous strontium hydroxide reacts with aqueous hydrobromic acid to produce water and aqueous strontium bromide.
A common demonstration in chemistry courses involves adding a tiny speck of manganese(IV) oxide to a concentrated hydrogen peroxide (H2O2) solution. Hydrogen peroxide decomposes quite spectacularly under these conditions to produce oxygen gas and steam (water vapor). Manganese(IV) oxide is a catalyst for the decomposition of hydrogen peroxide and is not consumed in the reaction. Write the balanced equation for the decomposition reaction of hydrogen peroxide.
Convert the following description into balanced equation: (a) In a gaseous reaction, hydrogen sulfide burns in oxygen to form sulfur dioxide and water vapor.
A novel process for obtaining magnesium from sea water involves several reactions. Write a balanced chemical equation for each step of the process.(e) Finally, the magnesium chloride is melted and electrolyzed to yield liquid magnesium metal and diatomic chlorine gas.
Convert the following description into balanced equation:(b) When crystalline potassium chlorate is heated to just above its melting point, it reacts to form two different crystalline compounds, potassium chloride and potassium perchlorate.
Convert the following description into balanced equation:(c) When hydrogen gas is passed over powdered iron(III) oxide, iron metal and water vapor form.
Convert the following description into balanced equation:(d) The combustion of gaseous ethane in air forms carbon dioxide and water vapor.
Copper(II) sulfide is oxidized by molecular oxygen to produce gaseous sulfur trioxide and solid copper(II) oxide. The gaseous product then reacts with liquid water to produce liquid hydrogen sulfate as the only product. Write the two equations which represent these reactions.
Convert the following description into balanced equation:(e) Iron(II) chloride is converted to iron(III) fluoride by treatment with chlorine trifluoride gas. Chlorine gas is also formed.
Methane (CH4) is the main component of marsh gas. Heating methane in the presence of sulfur produces carbon disulfide and hydrogen sulfide as the only products. Write the balanced chemical equation for the reaction of methane and sulfur.
Write an equation to show how sulfuric acid is produced in the atmosphere.
The multistep smelting of ferric oxide to form elemental iron occurs at high temperatures in a blast furnace. In the first step, ferric oxide reacts with carbon monoxide to form Fe3O4. This substance reacts with more carbon monoxide to form iron(II) oxide, which reacts with still more carbon monoxide to form molten iron. Carbon dioxide is also produced in each step. (a) Write an overall balanced equation for the iron-smelting process.
Write an equation to show how sulfuric acids in acid rain reacts with marble and limestone. (Both marble and limestone are primarily calcium carbonate.)
A 0.4230-g sample of impure sodium nitrate was heated, converting all the sodium nitrate to 0.2864 g of sodium nitrite and oxygen gas. Determine the percent of sodium nitrate in the original sample.
Silicon is produced for the chemical and electronics industries by the following reactions. Give the balanced equation for the reaction:Liquid silicon tetrachloride is reacted with very pure solid magnesium, producing solid silicon and solid magnesium chloride.
Write a balanced equation for the following gas phase reaction (carbon is black, hydrogen is light blue, and fluorine is green):
Write a balanced molecular equation describing each of the following chemical reactions.(a) Solid calcium carbonate is heated and decomposes to solid calcium oxide and carbon dioxide gas.
Solid copper reacts with solid sulfur to form solid copper(I) sulfide. What is the balanced equation?
Balance the following equation: a. Zn +H2SO4 → ZnSO4 + H2 b. Al + H2SO4 → Al2(SO4)3 + H2
Write the balanced chemical equation for the following reaction. Phases are optional. The reaction of zinc metal and hydrochloric acid produces hydrogen and zinc chloride.
Write the balanced equation for the complete combustion of each of the following compounds.
Part AGaseous acetylene (C2H2) reacts with oxygen gas to form gaseous carbon dioxide and gaseous water. Express your answer as a chemical equation. Identify all of the phases in your answer. Part BChlorine gas reacts with aqueous potassium iodide to form solid iodine and aqueous potassium chloride. Express your answer as a chemical equation. Identity all of the phases in your answer. Cl2 (g) + 2KI (aq) → I2 (s) + 2KCl (aq) Part CSolid lithium oxide reacts with liquid water to form aqueous lithium hydroxide. Express your answer as a chemical equation. Identify all of the phases in your answer. Li2O (s) + H2O (l) → 2LiOH (aq)
In our bodies, sugar is broken down with oxygen to produce water and carbon dioxide. Write a balanced equation for the complete oxidation reaction that occurs when glucose (C6H12O6) reacts with oxygen. Use the smallest possible integer coefficients.
Phosphorus (P4) burns in air to give diphosphorus pentoxide. Write a balanced chemical equation for the reaction. 
Complete and balance the following reaction. Include states for all products. If no reaction occurs, write "No Reaction"H3PO4 (aq) + Al(OH)3(s) →
Consider this aqueous reaction. HCN (aq) + Be(OH)2 (aq) →What is the formula for the salt that forms?
Write and balance the equation for the complete combustion of heptane, C7H16. You do not need to include any phase symbols or energy changes.
When the equation below is balanced, the coefficient of silver (Ag) is: __Cu + __AgNO3 → __Cu(NO3)2 + __Ag
Iron(III) oxide reacts with aluminum metal powder to make aluminum oxide and iron metal (and a whole lotta heat!). What are the stoichiometric coefficients for the balanced chemical equation (as written)? _____ Iron (III) oxide + ____ aluminum metal → _____ aluminum oxide + _____ iron metal
Automobile airbags inflate due to the formation of nitrogen gas from the following chemical reaction. 2NaN3 (s) → 3N2 (g) + 2Na (s) Identify the number of each atom in the reactants and products for this balanced reaction. 
Part A Balance the following equation for the synthesis of hydrazine, N2H4, a substance used as rocket fuel. NH3 (g) + Cl2 (g) → N2H4 (l) + NH4Cl (s) Express your answer as a chemical equation. Identify all of the phases in your answer.
Balance the following reactions: a. _____CaO (s) + _____C (s) → _____CaC 2 (s) + _____CO2 (g) b. _____P4O10 (s) + _____H2O (l) → _____H3PO4 (l)
A balanced reaction equation must have the same number of atoms of each element on both sides of the equation. The reaction given below represents the combustion of propanol. To verify that the equation is balanced, count the atoms of each element on both sties of the reaction. 2C3H7OH + 9O2 → 6CO2 + 8H2O Is the reaction balanced?              • yes               • no
Click in the box to activate the palette. Write a balanced equation for the following by inserting the correct coefficients. Al(NO3)3 (aq) + KOH(aq) → KNO 3 (aq) + Al(OH)3 (s)
Balance each of the following neutralization reactions. Part AHCl (aq) + Mg(OH)2 (s) → MgCl2 (aq) + H2O (l) Express your answer as a chemical equation. Identify all of the phases in your answer. Part BH3PO4 (aq) + NaOH(aq) → Na3PO4(aq) + H2O(l) Express your answer as a chemical equation. Identify all of the phases in your answer.
Click in the answer box to activate the palette. Convert the following into a balanced equation: Liquid disilicon hexachloride reacts with water to form solid silicon dioxide hydrogen chloride gas, and hydrogen gas. Be sure to include the state of each reactant and product in the equation.
The equilibrium system between sulfur dioxide gas, oxygen gas, and sulfur trioxide gas is given. 2SO2(g) + O2(g) ⇌ 2SO3(g) Write the balanced chemical equation for the reverse reaction. Include physical states for all species.
The Determine the balanced chemical equation for this reaction. C8H18 (g) + O2 (g) → CO2 (g) + H2O (g) Enter the coefficients for each compound in order, separated by commas. For example, 1,2,3,4 would indicate one mole of C8H18, two moles of O2, three moles of CO2, and four moles of H2O.
Part A CO(g) + O2(g) → CO2(g)Express your answer as a balanced chemical equation. Identify all of the phases in your answer. Part B N2O5(g) + H2O(l) → HNO3(aq) Express your answer as a balanced chemical equation. Identify all of the phases in your answer. Part C CH4(g) + Cl2(g) → CCl4(l) + HCl(g)Express your answer as a balanced chemical equation. Identify all of the phases in your answer. Part D Zn(OH)2(s) + HNO3(aq) → Zn(NO3)2(aq) + H2O(l)Express your answer as a balanced chemical equation. Identify all of the phases in your answer.
Write the balanced chemical equation for the following reaction. Phases are optional. Solid iron(II) hydroxide decomposes to form solid iron(II) oxide and liquid water.
Balance each of the following neutralization reactions: Part A HNO3 (aq) + NaOH(s) → H2O(l) + NaNO3 (aq) Express your answer as a chemical equation. Identify all of the phases in your answer. Part B H2SO4 (aq) + KOH(s) → H2O(l) + K2SO4 (aq) Express your answer as a chemical equation. Identify all of the phases In your answer.
Check in the box to activate the palette.Write a balanced equation for the following by inserting the correct coeficients.Al(NO3)3 aq) + KOH(aq) → KNO3 (aq) + Al(OH)2 (s)
Click in the answer box to activate the palette.Convert the following into a balanced equation: When nitrogen dioxide is bubbled into water, a solution of nitric acid forms and gaseous nitrogen monoxide is released. Be sure to include the state of each reactant and product in the equation.
A balance reaction equation must have the same number of atoms of each element on both sides of the equation. The reaction given below represents the combustion of acetone. To verity that the equation is balanced, count the atoms of each element on both sides of the reaction. CH3COCH3 + 4O2 → 3CO2 + 3H2O Is the reaction balanced?                   (i) yes                   (ii) no
Complete the balanced equations for these reactions that were observed in the lab.___Zn (s) + ___ HCl (aq) → ZnCl2 (aq) + ___ H2 (g) ___ H2 (g) + ___ O2 + flame  →  ___ H2O (g) ___ H2O2 (l)  → ___ H2O (l) + ___ O2 (g) ___ O2 (g) + C + flame → ___ CO2 (g) (the carbon came from the glowing splint)
When methane (CH4) bums it reacts with oxygen gas to produce carbon dioxide and water. The unbalanced equation for this reaction is CH4 (g) + O2 (g) → CO2 (g) + H2O (g) This type of reaction is referred to as a complete combustion reaction. Part AWhat coefficients are needed to balance the equation for the complete combustion of methane? Enter the coefficients in the order CH4, O2, CO2, and H2O, respectively. Express your answer as four Integers, separated by commas (e g.. 1,2, 3, 4).
Polishing Silver Silver tamish is the result of silver metal reacting with sulfur compounds, such as H2S, in the air. The tamish on silverware (Ag2S) can be removed by soaking in a solution of NaHCO3 (baking soda) in a basin lined with aluminum foil. Write a balanced equation for the tarnishing of Ag to Ag2S. Do not include phases. How many moles of electrons are transferred per mole of silver? Write a balanced reaction for the reaction of Ag2S with Al metal and H2O to produce Al(OH)3, H2S, and Ag metal. Do not include phases.
When aluminum, Al, metal is dipped in an aqueous solution of hydrochloric acid, HCl, hydrogen gas H2 is produced with the formation of an aluminum chloride, AlCl2, solution. Write the balanced chemical equation showing the phase of reactants and products. Express your answer as a chemical equation including phases. 
When the following equation is balanced (without fractional coefficients), what is the coefficient of H2?Al + H2SO4 → Al2(SO4)3 + H2
What is the total number of oxygen atoms on the right-hand side of this chemical equation? 3HNO2 (aq) → HNO3 (aq) +H2O (l) + 2NO (g) 
Write and balance the equation for the complete combustion of heptane, C7H16. You do not need to include any phase symbols or energy changes. 
Balance the following chemical reaction:C3H8 + O2 → H2O + CO2
Determine which elements are balanced and which are unbalanced in the following partially balanced chemical equation. 2LiOH + H2SO4 → Li2SO4 + H2O 
Balance the following equations by inserting coefficients as needed. 1. NaH + H2O → NaOH + H22. SO2 + O2 → SO3
Consider the following reaction:Mg (s) + 2H2O (l) → Mg(OH)2 (aq) + H2 (g)What symbol is used in a chemical equation to represent the following phrases? Select the symbol in blue and drag in into the appropriate bin.