Gases and phase diagrams

In which beaker would the particles have the highest average kinetic energy?

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Which process is exothermic?

• sublimation of iodine

• melting of copper

• boiling of water

• condensation of ethanol vapor

An assumption of the kinetic theory of gases is that the particles of a gas have

• strong attraction for each other and a significant volume

• strong attraction for each other and an insignificant volume

• little attraction for each other and a significant volume

• little attraction for each other and an insignificant volume

The table below shows mass and volume data for four samples of substances at 298 K and 1 atmosphere.

Which two samples could consist of the same substance?

• A and B

• A and C

• B and C

• C and D

A 220.0-mL sample of helium gas is in a cylinder with a movable piston at 105 kPa and 275 K. The piston is pushed in until the sample has a volume of 95.0 mL. The new temperature of the gas is 310. K. What is the new pressure of the sample?

• 51.1 kPa

• 274 kPa

• 216 kPa

• 243 kPa

The graph below represents the heating curve of a substance that starts as a solid below its freezing point.

What is the melting point of this substance?

• 55°C

• 120°C

• 30°C

• 90°C

Which of the following gases would have the slowest rate of diffusion when all of the gases are held at the same temperature and pressure?

• N₂

• O₂

• CO₂

• NO

Which will sublime when heated?

• H₂O (l)

• I₂(s)

• SO₂ (aq)

• N₂ (g)

Which compound has the lowest vapor pressure at 50°C?

• ethanoic acid

• ethanol

• propanone

• water

A sample of pure water at 50.°C has a vapor pressure closest to

• 5.0 kPa

• 12 kPa

• 101.3 kPa

• 50 kPa