Chemistry Chemistry Practice Problems Solutions Library

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Q. Determine whether each of the following solutes is more soluble in hot water or cold water.sulfur dioxidechlorineheliumsucrosesodium chloride

Solved • Aug 2, 2019

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Q. A supersaturated solution of sucrose (C12H22O11) is made by dissolving sucrose in hot water and slowly letting the solution cool to room temperatur...

Solved • Dec 3, 2018

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Q. The solubility of Cr(NO3)3 • 9H2O in water is 208 g per 100 g of water at 15˚C. A solution of Cr(NO3)3 • 9H2O in water at 35˚C is formed by dissolv...

Solved • Dec 3, 2018

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Q. The solubility of Cr(NO3)3 •9 H2O in water is 208 g per 100 g of water at 15 oC. A solution of Cr(NO3)3 •9 H2O in water at 35 oC is formed by disso...

Solved • Dec 3, 2018

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Q. The solubility of Cr ( NO3 )3 9 H2O in water is 208 g per 100 g of water at 15 oC. A solution of Cr ( NO3 )3 9 H2O in water at 35 oC is formed by d...

Solved • Dec 3, 2018

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Q. Precipitation from a supersaturated sodium acetate solution. The solution on the left was formed by dissolving 156 g of the salt in 100 mL of water...

Solved • Dec 3, 2018

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Q. For the dissolution of LiCl in water, Hsoln = -37 kJ/mol.Which term would you expect to be the largest negative number: Hsolvent, Hsolute, or Hmix?

Solved • Dec 3, 2018

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Q. An ionic compound has a very negative Hsoln in water.Which term would you expect to be the largest negative number: Hsolvent, Hsolute, or Hmix?

Solved • Dec 3, 2018

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Q. The solubility of MnSO4 2 O in water at 20 oC is 70 g per 100 mL of water.Given a solution of MnSO4 2 O of unknown concentration, what experiment c...

Solved • Dec 3, 2018

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Q. The solubility of MnSO4 in water at 20 oC is 70 g per 100 mL of water.Is a 1.24 M solution of MnSO4 in water at 20 oC saturated, supersaturated, or...

Solved • Dec 3, 2018

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Q. Which of the following is the best representation of a saturated solution?

Solved • Dec 3, 2018

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Q. A solution contains 25 g of NaCl per 100.0 g of water at 25˚C. Is the solution unsaturated, saturated, or supersaturated?

Solved • Dec 3, 2018

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Q. When ammonium chloride (NH4Cl) is dissolved in water, the solution becomes colder. What can you conclude about the relative magnitudes of the latti...

Solved • Dec 3, 2018

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Q. A solution contains 32 g of KNO3 per 100.0 g of water at 25 oC. Is the solution unsaturated, saturated, or supersaturated?

Solved • Dec 3, 2018

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Q. A KNO3 solution containing 51 g of KNO3 per 100.0 g of water is cooled from 40˚C to 0˚C. What will happen during cooling?

Solved • Dec 3, 2018

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Q. A KCl solution containing 42 g of KCl per 100.0 g of water is cooled from 60  m^circ C to 0 ˚C m^circ C. What happens during cooling?

Solved • Dec 3, 2018

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Q. The enthalpy of solution for NaOH is -44.46 kJ/mol. What can you conclude about the relative magnitudes of the absolute values of ΔHsolute and ΔHhy...

Solved • Dec 3, 2018

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Q. An aqueous solution is saturated in both potassium chlorate and carbon dioxide gas at room temperature. What happens when the solution is warmed to...

Solved • Dec 3, 2018

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Q. Some laboratory procedures involving oxygen-sensitive reactants or products call for using preboiled (and then cooled) water. Explain why this is so.

Solved • Dec 3, 2018

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Q. A person preparing a fish tank uses boiled (and then cooled) water to fill it. When the fish is put into the tank, it dies. Explain.

Solved • Dec 3, 2018

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Q. The enthalpy of solution for cesium fluoride is -36.8 kJ/mol. What can you conclude about the relative magnitudes of ΔHsolute and ΔHhydration?

Solved • Dec 3, 2018

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Q. A solution is saturated in both nitrogen gas and potassium bromide at 75 oC. When the solution is cooled to room temperature, what is most likely t...

Solved • Dec 3, 2018

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Q. Caffeine is about 10 times as soluble in hot water as in cold water. A chemist puts a hot-water extract of caffeine into an ice bath, and some caff...

Solved • Oct 30, 2018

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Q. Sketch an enthalpy diagram for the process of dissolving KCl(s) in H2O (endothermic).

Solved • Oct 29, 2018

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Q. Suppose you are presented with a clear solution of sodium thiosulfate, Na2S2O3. How could you determine whether the solution is unsaturated, satura...

Solved • Oct 29, 2018

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Q. For the following solute–solvent combinations, state the sign and relative magnitudes for ΔH1, ΔH2, ΔH3, and ΔHsoln (as defined in Fig. 10‑1 of the...

Solved • Oct 29, 2018

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Q. This question has multiple parts. Work all the parts to get the most points. In a coffee-cup calorimeter, 1.17 g NH4NO3 was mixed with 55.00 g wate...

Solved • Sep 11, 2018

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Q. Potassium nitrate has a lattice energy of -163.8 kcal/mol and a heat of hydration of -155.5 kcal/mol. Part AHow much potassium nitrate has to disso...

Solved • Sep 11, 2018

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Q. A solution that contains a large amount of salt and a small amount of water is said to be a _______ solution. a. dilute b. concentrated c. saturate...

Solved • Apr 2, 2018

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Q. Select the steps that are associated with energy entering the system. Check all that apply.a. the separation of solvent moleculesb. the separation ...

Solved • Mar 16, 2018

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Q. Which of the following solutions is unstable?a) An unsaturated solutionb) A saturated solutionc) A supersaturated solutiond) Both a and be) Both a ...

Solved • Oct 31, 2017

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Q. A beaker in the lab at 25 °C contains a saturated solution. More solid is added to the beaker. Which of the following statements best represents wh...

Solved • Jul 25, 2017

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Q. In a saturated solution of a salt in water, ________.A. the rate of crystallization > the rate of dissolutionB. the rate of dissolution > the...

Solved • Jul 25, 2017

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Q. If a solution is supersaturated, thenA) the solute concentration is above the solubility limit, but the system is in equilibrium.B) the solute conc...

Solved • Mar 21, 2017

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Q. CaCl2 has a solubility of 74 g/100g water at 20 oC. If 37g of CaCl2 are dissolved in 50 g of water at 20oC, consider the following statements:I. Th...

Solved • Sep 19, 2016

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Q. A solution is formed at room temperature by vigorously dissolving enough of the solid solute so that some solid remains at the bottom of the soluti...

Solved • Sep 16, 2016

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Q. A solution containing more than the equilibrium amount is called ____________.A) an unsaturated solutionB) a dilute solutionC) a supersaturated sol...

Solved • Sep 14, 2016

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Q. What term describes the process when two liquids are completely soluble in each other in all proportions?A) solvationB) miscibleC) unsaturatedD) sa...

Solved • Aug 25, 2016

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Q. Explain what will happen to a supersaturated solution if left in a closed container at a constant temperature over time. 

Solved • Jul 7, 2016

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Q. A mixture of 100 g of K 2Cr2O7 and 200 g of water is stirred at 60°C until no more of the salt dissolves. The resulting solution is poured off, lea...

Solved • Apr 26, 2016

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Q. The solubility of a substance is 60 g per 100 mL of water at 15° C. A solution of this substance is prepared by dissolving 75 g in 100 mL of water ...

Solved • Apr 26, 2016

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Q. A student mixes 10.0 g of KCIO 3 with 45.0 g of H 2O and stirs it for a long time at 60 °C until the solution is completely clear, then allows it t...

Solved • Apr 25, 2016

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Q. A saturated solution is defined asA) a solution that is in equilibrium with both pure solvent and undissolved solute.B) a solution that is in equil...

Solved • Apr 20, 2016

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Q. A solution is formed at room temperature by dissolving enough of the solid solute so that some solid remains at the bottom of the solution.  Which ...

Solved • Apr 11, 2016

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Q. Which of the following ions should have the most exothermic ΔH  hydration? A) Ca 2+      B) Na +      C) Sr 2+    D) Mg 2+      E) Al 3+

Solved • Apr 11, 2016

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Q. How much NaCl will remain undissolved if 120 g of NaCl is mixed into 100 g of water at 40°C ? a) 20 b) 40 c) 80 d) 100      

Solved • Apr 7, 2016

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Q. A solution contains 25 g of NaCl per 100.0 g of water at 25 °C. Is the solution unsaturated, saturated, or supersaturated?

Solved • Feb 4, 2016

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Q. Choose the situation below that would result in an exothermic ΔH solution. a. When |ΔH ­solute| > |ΔH­ hydration|   b. When |ΔH­ solute| is cl...

Solved • Feb 4, 2016