1. Thermochemistry Review
Chapter 16

2. A piece of metal is heated, then submerged in cool water
A piece of metal is heated, then submerged in cool water. Which statement below describes what happens?
a. The temperature of the metal will increase.
b. The temperature of the water will increase.
c. The temperature of the water will decrease.
d. The temperature of the water will increase and the temperature of the metal will decrease.

3. Which of the following is NOT a form of energy?
a. light c. heat
b. Pressure d. electricity

4. What is the amount of heat required to raise the temperature of 200
What is the amount of heat required to raise the temperature of g of aluminum by 10.0 C? (specific heat of aluminum = 0. 21cal/gC)
a. 420 cal c. 42,000 cal
b cal d. 420,000 cal

5. Calculate the energy required to produce 7
Calculate the energy required to produce 7.00 mol ClO on the basis of the following balanced equation.
2Cl(g) + 7O(g) kcal  2ClO(g)
a kcal c. 130 kcal
b. 65 kcal d. 455 kcal

6. What is the standard heat of reaction for the following reaction?
Zn(s) + Cu (aq)  Zn(aq) + Cu(s)
(Hf for Cu(aq)=+64.4 kJ/mol; Hf for Zn(aq)= –152.4 kJ/mol)
a kJ released per mole
b kJ released per mole
c kJ absorbed per mole
d kJ absorbed per mole

7. During a phase change, the temperature of a
substance ____.
a. increases c. remains constant
b. decreases d. may increase or decrease

8. a. -98.9 kJ c. +197.8 kJ b. -197.8 kJ d. not enough info
Calculate H for the reaction of sulfur dioxide
with oxygen. 2SO2(g) + O2(g)  2SO3(g) (Hf SO2(g) = –296.8 kJ/mol; Hf SO3(g) = –395.7 kJ/mol)
a kJ c kJ
b kJ d. not enough info

9. Which of the following substances has the
highest specific heat?
a. steel c. alcohol
b. water d. chloroform

10. When the molecules of gases are heated, the average kinetic energy of the molecules increases.
a. TRUE b. FALSE

11. The intermolecular forces between molecules of oxygen are dipole-dipole in nature.
a. TRUE b. FALSE

12. The surface tension of water decreases when a detergent is added to it.
a. TRUE b. FALSE

13. Carbon dioxide cannot be liquefied above the critical temperature, even when high pressure is applied.
a. TRUE b. FALSE

14. Which of the following rumors about Mrs. Dogancay is TRUE?
a. Her natural hair color is blonde
b. She is actually 65, but has had a lot of plastic surgery
c. She comes from a family of 9.
d. She used to teach AP Calculus.

15. For a process, the enthalpy change of a system is 1
For a process, the enthalpy change of a system is 1.25 x105 J and the entropy change is J/K. Calculate the free energy change of the system at 290 K.
a x 104 J c. 1.2 x105 J
b x 104 J d. 1.2 x104 J

16. A process that absorbs heat is a(n)___.
a. endothermic process
b. exothermic process
c. polythermic process
d. ectothermic process

17. When 45 g of an alloy, at 25C, are dropped into 100
When 45 g of an alloy, at 25C, are dropped into g of water, the alloy absorbs 956 J of heat. If the final temperature of the alloy is 37C, what is its specific heat?
a cal/gC c cal/gC
b cal/gC d cal/gC

18. The amount of heat transferred from an object depends on which of the following?
a. the specific heat of the object
b. the initial temperature of the object
c. the mass of the object
d. all of the above

19. Calculate the energy released when 24
Calculate the energy released when g Na2O reacts in the following reaction.
Na2O(s) + 2HI(g)  2NaI(s) + H2O(l) H = – kcal
a kcal c kcal
b kcal d. 3.00x102 kcal