A

B

C

D

A

B

C

D

A. the change in energy of the molecules

B. the change in momentum of the molecules

C. the change in power of the molecules

D. the change in speed of the molecules

A. They are hit by air molecules.

B. They are less dense than air.

C. They are moved by convection currents.

D. They gain energy from the light.

A. Slower-moving molecules are carried away by the air bubbles.

B.The air molecules conduct heat from the liquid.

C. The air sets up convection currents in the liquid.

D. The molecules with most energy leave the liquid.

A. folded clothes

B. higher temperature

C. wetter clothes

D. windy day

A. The average distance between molecules increases.

B. The average kinetic energy of the molecules increases

C. The mass of each molecule increases.

D. The volume of each molecule increases.

A. The least energetic molecules escape from the surface and the temperature of the liquid decreases.

B. The least energetic molecules escape from the surface and the temperature of the liquid increases.

C. The most energetic molecules escape from the surface and the temperature of the liquid decreases.

D. The most energetic molecules escape from the surface and the temperature of the liquid increases.

A

B

C

D

A. The changes in the momentum of the gas molecules striking the walls of the container increase.

B. The forces of attraction between the gas molecules and the walls of the container increase.

C. The gas molecules collide with each other more frequently.

D. The gas molecules lose more energy when they strike the walls of the container.