Simple Kinetic Molecular Model of Matter

Which row describes the forces between the molecules and the motion of the molecules in a solid?

• A

• B

• C

• D

The relationship between pressure p and volume V of a

gas is given as pV = constant.

Under which conditions for the mass of a gas and for its temperature does the equation hold?

• A

• B

• C

• D

When molecules of a gas rebound from a wall of a container, the wall experiences a pressure.

What is the cause of this pressure?

• 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

Diagram 1 shows apparatus being used to observe smoke particles.

Diagram 2 shows how a smoke particle moves randomly.

Why do the smoke particles move randomly?

• 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 student blows air through a liquid using a straw. This causes the liquid to evaporate quickly and therefore to cool.

Which statement explains why the remaining liquid cools?

• 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.

Wet clothes are hanging outside to dry.

Which condition decreases the rate of evaporation of the water from the clothes?

• A. folded clothes

• B. higher temperature

• C. wetter clothes

• D. windy day

A gas is heated in a sealed container.

The volume of the container does not change.

What happens to the molecules of the gas?

• 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.

Which statement about the evaporation of a liquid is correct?

• 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.

Which row describes the arrangement and the motion of the molecules in a gas?

• A

• B

• C

• D

A closed container of gas is heated. The

pressure of the gas increases.

Which statement explains this increase in

pressure?

• 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.