General Chemistry 11th Edition By Darrell Ebbing – Test Bank

1. Which of the following statements concerning liquids is incorrect?
a. The volume of a liquid changes very little with pressure.
b. Liquids are relatively incompressible.
c. Liquid molecules move slowly compared to solids.
d. Non-volatile liquids have low vapor pressures at room temperature.
e. The molecules of a liquid are in constant random motion.
ANSWER: c
POINTS: 1
DIFFICULTY: easy
REFERENCES: 11.1
LEARNING OBJECTIVES: GENE.EBBI.13.270 – Compare a gas, a liquid, and a solid using a kinetic-molecular theory description.
TOPICS: phases
liquid
KEYWORDS: properties of liquids
OTHER: general chemistry

2. Which of the following statements concerning solids, liquids and gases is/are correct?

1. The close contact of the particles in a solid prevents all possible motion, including vibrational motion.
2. Liquids and gases are both considered fluids.
3. The postulate from kinetic-molecular theory that the particles in a gas are in constant random motion is equally applicable to liquids, except the particles are more tightly packed in a gas.
a. 1 only
b. 2 only
c. 3 only
d. 1 and 2
e. 2 and 3
ANSWER: b
POINTS: 1
DIFFICULTY: easy
REFERENCES: 11.1
LEARNING OBJECTIVES: GENE.EBBI.13.270 – Compare a gas, a liquid, and a solid using a kinetic-molecular theory description.
TOPICS: phases
liquid

3. What is the name for the following phase change?
I2(l) → I2(g)
a. vaporization
b. freezing
c. condensation
d. sublimation
e. melting
ANSWER: a
POINTS: 1
DIFFICULTY: easy
REFERENCES: 11.2
LEARNING OBJECTIVES: GENE.EBBI.13.271 – Define melting, freezing, vaporization, sublimation, and condensation.
TOPICS: phases
phase transitions
OTHER: general chemistry

4. Which of the following processes is exothermic?
a. condensation of water
b. fusion of ethanol
c. vaporization of water
d. evaporation of ammonia
e. sublimation of carbon dioxide
ANSWER: a
POINTS: 1
DIFFICULTY: moderate
REFERENCES: 11.2
LEARNING OBJECTIVES: GENE.EBBI.13.271 – Define melting, freezing, vaporization, sublimation, and condensation.
TOPICS: phases
phase transitions

5. The process represented by the equation C10H8(s) → C10H8(g) is
a. melting.
b. liquefaction.
c. sublimation.
d. condensation.
e. fusion.
ANSWER: c
POINTS: 1
DIFFICULTY: easy
REFERENCES: 11.2
LEARNING OBJECTIVES: GENE.EBBI.13.271 – Define melting, freezing, vaporization, sublimation, and condensation.
TOPICS: phases
phase transitions
OTHER: general chemistry

6. When a solid undergoes a phase change to a gas, the process is called
a. fusion.
b. condensation.
c. melting.
d. vaporization.
e. sublimation.
ANSWER: e
POINTS: 1
DIFFICULTY: easy
REFERENCES: 11.2
LEARNING OBJECTIVES: GENE.EBBI.13.271 – Define melting, freezing, vaporization, sublimation, and condensation.
TOPICS: phases
phase transitions
OTHER: general chemistry

7. A bottle is filled with a small amount of a volatile liquid and sealed. Sometime later it is observed that no liquid is evident in the sealed bottle. Which of the following statements would explain this observation?
a. More time is needed to establish equilibrium.
b. Liquid and vapor are at equilibrium in the bottle.
c. Too little liquid was added to achieve a liquid vapor equilibrium in the closed system.
d. The vapor state is favored when equilibrium is established.
e. The liquid has undergone sublimation.
ANSWER: c
POINTS: 1
DIFFICULTY: moderate
REFERENCES: 11.2
LEARNING OBJECTIVES: GENE.EBBI.13.272 – Define vapor pressure.
TOPICS: phases
phase transitions
KEYWORDS: vapor pressure
OTHER: general chemistry

8. Enough of a volatile liquid is placed in a closed container to achieve a liquid-vapor equilibrium at a fixed temperature. Which of the following statements regarding this system is/are correct once equilibrium is established?

1. Liquid molecules are no longer evaporating.
2. The number of vapor molecules remains essentially constant.
3. The partial pressure exerted by the vapor molecules is called the vapor pressure of the liquid.
a. 1 only
b. 2 only
c. 3 only
d. 1 and 2
e. 2 and 3
ANSWER: e
POINTS: 1
DIFFICULTY: moderate
REFERENCES: 11.2
LEARNING OBJECTIVES: GENE.EBBI.13.272 – Define vapor pressure.
TOPICS: phases
phase transitions

9. Enough of a volatile liquid is placed in a closed container to achieve a liquid-vapor equilibrium. Which of the following statements regarding this system is/are correct once equilibrium is established?

1. The rate of condensation is equal to the rate of evaporation.
2. The fraction of molecules with enough energy to escape the liquid surface depends on the liquid surface area.
3. The vapor pressure is independent of the temperature.
a. 1 only
b. 2 only
c. 3 only
d. 1 and 2
e. 1, 2, and 3
ANSWER: a
POINTS: 1
DIFFICULTY: moderate
REFERENCES: 11.2
LEARNING OBJECTIVES: GENE.EBBI.13.272 – Define vapor pressure.
TOPICS: phases
phase transitions

10. If more ice is added to an ice-water mixture at equilibrium,
a. the temperature will increase somewhat.
b. the vapor pressure of the water will decrease.
c. the temperature will decrease somewhat.
d. the vapor pressure of the water will rise.
e. the vapor pressure of the water will remain constant.
ANSWER: e
POINTS: 1
DIFFICULTY: moderate
REFERENCES: 11.2
LEARNING OBJECTIVES: GENE.EBBI.13.273 – Describe the process of reaching a dynamic equilibrium that involves the vaporization of a liquid and condensation of its vapor.
TOPICS: phases
phase transitions
KEYWORDS: vapor pressure
OTHER: general chemistry