Ch.6 - Thermochemistry WorksheetSee 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
Sections
Internal Energy
Calorimetry
Thermochemical Equation
Hess's Law
Enthalpy of Formation
End of Chapter 6 Problems
Additional Practice
Units of Energy
Additional Guides
Endothermic & Exothermic Reactions
Enthalpy
LearnAdditional Practice
Next SectionCalorimetry

Solution: Consider the energy diagram shown in the figure .Does this diagram represent an increase or decrease in the internal energy of the system?        

Problem

Consider the energy diagram shown in the figure Reactants go to products as internal energy (E) increases..

Does this diagram represent an increase or decrease in the internal energy of the system?        

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Practice Problems
Which statement is not correct? a. Internal energ...
1 L.atm =101.325 J When 2.00 kJ of energy is tran...
DO NOT FORGET TO WRITE A BALANCED CHEMICAL EQUATIO...
A system releases 415 kJ of heat and does 125 kJ o...
The gas in a piston is warmed and absorbs 655 J of...
The change in enthalpy (∆H) is a measure of the he...
What is internal energy?
Is internal energy a state function?
In which direction does energy flow?
What is heat?
Explain the difference between heat and temperatur...
How is the change in internal energy of a system r...
Explain how the sum of heat and work can be a stat...
What is pressure-volume work?
Identify each of the following energy exchanges as...
Explain the significance of the law of conservatio...
What do we call the part of the universe that is n...
The accompanying photo shows a pipevine swallowtai...
The accompanying photo shows a pipevine swallowtai...
Imagine a container placed in a tub of water, as d...
The accompanying photo shows a pipevine swallowtai...
What is meant by the internal energy of a system?
By what means can the internal energy of a closed ...
Imagine that you are climbing a mountain.Is the di...
Imagine that you are climbing a mountain.Is the ch...
Consider the two diagrams below. The equations y...
Consider the two diagrams below. Would similar r...
At 20 oC (approximately room temperature) the aver...
At 20 oC (approximately room temperature) the aver...
Suppose an Olympic diver who weighs 54.0 ...
A sample of gas is contained in a cylinder-and-pis...
A sample of gas is contained in a cylinder-and-pis...
Consider the systems shown in the following figure...
A system goes from state 1 to state 2 and back to ...
Identify the force present, and explain whether wo...
A standard air conditioner involves a refrigerant ...
Identify the force present, and explain whether wo...
A standard air conditioner involves a refrigerant ...
Identify the force present, and explain whether wo...
Identify the force present, and explain whether wo...
Is a human being an isolated, closed, or open syst...
Electrostatic potential energy. At finite sepa...
Write an equation that expresses the first law of ...
The internal energy of an ideal gas depends only o...
What is meant by the term state function?
Give an example of a quantity that is a state func...
Is the volume of the system a state function?
H is a state function, but q is not a state functi...
A system that does work on its surroundings.If ...
You may want to reference (Pages 177 - 178) Sectio...
You may want to reference (Pages 177 - 178) Sectio...
What is work?
What is a state function?
List some examples of state functions.
During a normal breath, our lungs expand about 0.5...
A sample of gas is contained in a cylinder-and-pis...
Consider the accompanying energy diagram. (a) Does...
The contents of the closed box in each of the foll...
Which statement is true of the internal energy of ...
In the accompanying cylinder diagram a chemical pr...
Imagine a container placed in a tub of water, as d...
At constant pressure, which of these systems do wo...
Which statement is true of the internal energy of ...
Which one of the following statements is FALSE?The...
A rolling billiard ball collides with another bill...
Suppose an Olympic diver who weighs 52.0 kg execut...
All of the following statements are true EXCEPT:a....
(b) An adult person radiates heat to the surroundi...
Limestone stalactites and stalagmites are formed i...
A gas is allowed to expand at constant temperature...
For the following processes, calculate the change ...
For the following processes, calculate the change ...
For the following processes, calculate the change ...
A balloon is inflated from 0.0100 L to 0.400 L aga...
Which set of signs for q and w represent a system ...
A typical breath is around 0.5 L, but to get 2 sig...
A system that does no work but which receives heat...
Consider an ideal gas enclosed in a 1.00 L contain...
Consider an ideal gas enclosed in a 1.00 L contain...
The heat of vaporization of water at 373 K is 40.7...
Which expression describes the heat evolved in a c...
When 1 mol of a gas burns at constant pressure, it...
Which statement is true of a reaction in which ∆V ...
Which is true when a gas expands isothermically ag...
What is the change in the internal energy (in J) o...
If the volume of a system increases from 10.0 L to...
A certain liquid has Δvap Ho = 26.0 kJmol -1. Calc...
Which one of the following thermodynamic quantitie...
A gas at 25.00°C and 360.00 torr (760 torr = 1atm)...
Which set of signs for q and w represent a system ...
When fuel is burned in a cylinder equipped with a ...
Heat absorbed by a system at constant volume is eq...
Which of the following statements concerning the f...
Heat is1) A measure of temperature.2) A measure of...
A gas is allowed to expand, at a constant temperat...
Which of the following depicts a situation where t...
Calculate the amount of work done when 2.5 mole of...
Which statement is always true of the internal ene...
The internal energy of a system is the sum of all ...
Calculate the work for the expansion of CO2  from ...
Oxygen gas at 34.5°C is compressed from 45.7 L to ...
Which of the following is not a state function?A. ...
If the internal energy of the products of a reacti...
In which of these cases do the surroundings do wor...
Which of the following is true of the internal ene...
During an energy exchange, a chemical system absor...
Identify each of the following energy exchanges as...
A gas is confined to a cylinder fitted with a pist...
A gas is confined to a cylinder fitted with a pist...
A gas is confined to a cylinder fitted with a pist...
A gas is confined to a cylinder fitted with a pist...
The accompanying photo shows a pipevine swallowtai...
Consider the conversion of compound A into compoun...
Assume that the following reaction occurs at const...
Consider a system consisting of the following appa...
In the cylinder diagrammed below , a chemical proc...
In the cylinder diagrammed below , a chemical proc...
A balloonist begins a trip in a helium-filled ball...
Suppose an Olympic diver who weighs 54.0 kg execut...
Suppose an Olympic diver who weighs 54.0 kg execut...
The air bags that provide protection in autos in t...
An aluminum can of a soft drink is placed in a fre...
Energy diagram for the reaction 2 H2(g) + O2(g) → ...
Consider the systems shown in the following figure...
The circles represent a phase change at constant t...
The circles represent a phase change at constant t...
The circles represent a phase change at constant t...
The scene below represents a physical change takin...
The scene below represents a physical change takin...
The scene below represents a physical change takin...
In which of the following systems is(are) work don...
Consider the energy diagram shown in the figure .D...
Consider the energy diagram shown in the figure .W...
You may want to reference (Pages 167 - 172) Sectio...
The contents of the closed box in each of the illu...
Consider a system consisting of two oppositely cha...
Consider a system consisting of two oppositely cha...
Which of the following is true of the internal ene...
Consider a system consisting of two oppositely cha...
The internal energy of an ideal gas depends only o...
You may have noticed that when you compress the ai...
The methane molecule, CH4, has the geometry shown ...
You may have noticed that when you compress the ai...
You may want to reference (Pages 167 - 172) Sectio...
Which of the following is true of a reaction in wh...
The diagram shows four states of a system, each wi...
The diagram shows four states of a system, each wi...
The diagram shows four states of a system, each wi...
Why is the change in enthalpy usually easier to me...
What is the value of ΔEDelta E if Efinal equals Ei...
Three gas-phase reactions were run in a constant-p...
You may want to reference (Pages 177 - 178) Sectio...
Three gas-phase reactions were run in a constant-p...
Three gas-phase reactions were run in a constant-p...
The complete combustion of ethanol, C2H5OH(l), to ...
Identify each energy exchange as primarily heat or...
Nitrogen gas reacts with hydrogen gas to form ammo...
Determine whether the sign of E is positive or neg...
You may want to reference (Pages 166 - 172)Section...
Consider the following changes: a. N2 (g) → N2 (l)...
Consider these fictitious internal energy gauges f...
Identify each energy exchange as heat or work and ...
Suppose that the gas-phase reaction 2NO(g) + O2(g)...
Suppose that the gas-phase reaction 2NO(g) + O2(g)...
Suppose that the gas-phase reaction 2NO(g) + O2(g)...
The oxidation of copper(I) oxide, Cu 2O(s), to cop...
Classify the following by the sign of delta U for ...
A gas absorbs 45 kJ of heat and does 29 kJ of work...
A system releases 125 kJ of heat while 104 kJ of w...
Calculate ΔE for each of the followinga. q = -47 k...
When organic matter decomposes under oxygen-free (...
A cylinder and piston assembly (defined as the sys...
Calculate ΔE for each of the followingc. q = +47 k...
A system undergoes a process consisting of the fol...
If the internal energy of a thermodynamic system i...
A system releases 651 kJ of heat and does 130 kJ o...
The gas in a piston (defined as the system) is war...
The air within a piston equipped with a cylinder a...
When 1 mol of a fuel is burned at constant pressur...
When 1 mol of a fuel is burned at constant pressur...
Calculate the internal energy change for each of t...
Calculate the internal energy change for each of t...
Assume that the following reaction occurs at const...
What is the change in internal energy (in J) of a ...
A 100-W lightbulb is placed in a cylinder equipped...
Calculate E, if q = 0.766 kJ and w = -840 J .
When 1 mol of a gas burns at constant pressure, it...
When 1 mol of a gas burns at constant pressure, it...
A chemical system produces 155 kJ of heat and does...
Lighters are usually fueled by butane (C4H10). Whe...
Lighters are usually fueled by butane (C4H10). Whe...
A system absorbs 192 kJ of heat and the surroundin...
The air in an inflated balloon (defined as the sys...
A gas is compressed from an initial volume of 5.60...
A cylinder equipped with a piston expands against ...
When organic matter decomposes under oxygen-free (...
When organic matter decomposes under oxygen-free (...
How much work (in J) is required to expand the vol...
During a breath, the average human lung expands by...
How much work (in J) is involved in a chemical rea...
A sample of an ideal gas at 15.0 atm and 10.0 L is...
A piston performs work of 210. L ? atm on the surr...
Consider a mixture of air and gasoline vapor in a ...
As a system increases in volume, it absorbs 52.5 J...
One mole of nitrogen gas confined within a cylinde...
At constant temperature, a sample of helium gas ex...
For the isothermal expansion of a gas into a vacuu...
When 1 mol of a gas burns at constant pressure, it...
When 1 mol of a gas burns at constant pressure, it...
A cylinder with a moving piston expands from an in...
Isooctane (C8H18; d = 0.692 g/mL) is used as the f...
The change in internal energy for the combustion o...Which of the following statements about energy is ...
Consider a system  consisting of the following app...
The accompanying photo shows a pipevine swallowtai...
In a thermodynamic study a scientist focuses on th...Calculate the change in internal energy (ΔE) for a...Calculate the change in internal energy (ΔE) for a...For ethanol, ΔvapH° = 43.5 kJ mol-1. (i) Calculate...
In a thermodynamic study a scientist focuses on th...
A 200-lb man decides to add to his exercise routin...
What is the change in internal energy (in J) of a ...
A standard air conditioner involves a refrigerant ...
A gas-phase reaction was run in an apparatus desig...
A system goes from state 1 to state 2 and back to ...
Sign conventions for heat and work. Heat, q, gaine...
Which of the following cannot leave or enter a clo...
Which cannot leave or enter an isolated system? He...
You lose 9 pounds over a 26-day period. Which of t...The change in internal energy of a system made of ...To illustrate how to use the equation for PV work,...
An ideal gaseous reaction (which is a hypothetical...
A system absorbs 159 kJ of heat, and performs 84 k...