Question : 1.              Three phases of water shown in the figure.  List : 1335491

1.              Three phases of water are shown in the figure.  List the terms used to identify the phase changes indicated by the arrows.

A)A = sublimation, B = vaporization, C = freezing

B)A = condensation, B = sublimation, C = melting

C)A = freezing, B = vaporization, C = melting

D)A = deposition, B = vaporization, C = melting

E)A = deposition, B = sublimation, C = freezing

2.              Three phases of water are shown in the figure.  List the terms used to identify the phase changes indicated by the arrows.

A)A = sublimation, B = vaporization, C = freezing

B)A = vaporization, B = condensation, C = melting

C)A = vaporization, B = deposition, C = melting

D)A = sublimation, B = condensation, C = freezing

E)A = condensation, B = sublimation, C = freezing

3.              Which of the following statements is correct?

A)A liquid which has a high boiling point has a higher vapor pressure at a given temperature than a liquid with a low boiling point.

B)Liquids boil at higher temperatures in the mountains due to the higher altitude.

C)Evaporation is an exothermic process, since heat is given off when a substance vaporizes.

D)Since acetone (nail polish remover) evaporates more readily than water, one would assume that acetone has weaker intermolecular forces.

E)The phase change from solid to gas is exothermic.

4.              Which of the following statements is correct?

A)The phase change from solid to liquid is exothermic.

B)Liquids boil at lower than normal temperatures in Death Valley, since it is below sea level.

C)A substance with a low boiling point would be expected to have a relatively low vapor pressure at a low temperature.

D)The phase change from liquid to gas is exothermic.

E)When a substance condenses, heat energy is given off.

5.              Which of the following statements is correct?

A)When the temperature of a sample of liquid is increased, the molecules move faster, but there is no change in the vapor pressure of the sample.

B)The melting point of metallic sodium is 97.8oC, so at a temperature of 25oC, it is a liquid.

C)If you cook an egg on a mountain, it will require a short cooking time, due to the high elevation.

D)When liquids evaporate, it requires an input of energy from the surroundings, so the surroundings become warm.

E)Nitrogen gas has a boiling point of –196oC, so if it is cooled to –200oC, it condenses.

6.              Which of the molecular-level images in the figure shows the liquid and vapor phases in equilibrium in a closed container?

A)  I, II, and III    B)  none of the images    C)  I    D)  V    E)  V and VI

7.              From the vapor pressure curve of acetone, it can be seen that the normal boiling point of acetone is about _________.

A)  –50oC    B)  0oC    C)  50oC    D)  57oC    E)  100oC

8.              From the vapor pressure curve of propane, it can be seen that the normal boiling point of propane is about _________.

A)  –137oC    B)  –120oC    C)  –60oC    D)  –42oC    E)  0oC

9.              The atmospheric pressure on Mount Everest is about 0.30 atm.  From the vapor pressure curve of propane, it can be seen the boiling point of propane at this elevation is about _________.

A)  –137oC    B)  –120oC    C)  –67oC    D)  –42oC    E)  0oC

10.              Which of the following statements is correct?

A)At the melting point of a substance, the solid, liquid, and gas phases are all in equilibrium.

B)The freezing point and the melting point of a substance are the same.

C)There is no fundamental difference in the melting process for covalent substances and ionic substances.

D)When iodine vapor cools at atmospheric pressure, it condenses to the liquid state.

E)In order for a substance to go from the liquid phase to the gas phase, it must give off energy to the surroundings.

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