Kinetic Model of Matter

Liquid evaporates from a beaker.

What happens to the temperature of the remaining liquid and how does this temperature change affect the rate of evaporation?

• temperature decreases; rate of evaporation decreases

• temperature decreases; rate of evaporation increases

• temperature increases; rate of evaporation decreases

• temperature increases; rate of evaporation increases

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

What is the cause of this pressure?

• the change in energy of the molecules

• the change in momentum of the molecules

• the change in power of the molecules

• the change in speed of the molecules

Which statements about boiling and about evaporation are both correct?

• boiling takes place only at the surface ; evaporation takes place only at the surface

• boiling takes place only at the surface ; evaporation takes place throughout the liquid

• boiling takes place throughout the liquid ; evaporation takes place only at the surface

• boiling takes place throughout the liquid ; evaporation takes place throughout the liquid

• They are hit by air molecules.

• They are less dense than air.

• They are moved by convection currents.

• They gain energy from the light.

A closed container of gas is heated. The pressure of the gas increases.

Which statement explains this increase in pressure?

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

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

• The gas molecules collide with each other more frequently.

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

The gas in a sealed container is compressed at constant temperature.

Which graph shows how the pressure of the gas changes with its volume?

• 
• 
• 
• 

• completely changed to water is 1 and completely changed to steam is 3

• completely changed to water is 1 and completely changed to steam is 4

• completely changed to water is 2 and completely changed to steam is 3

• completely changed to water is 2 and completely changed to steam is 4

When steam condenses it becomes liquid water. When liquid water solidifies it becomes ice.

What happens to the temperature of steam while it is condensing, and what happens to the temperature of water while it is solidifying?

• temperature of steam while it is condensing decreases; temperature of water while it is solidifying decreases

• temperature of steam while it is condensing decreases; temperature of water while it is solidifying stays the same

• temperature of steam while it is condensing stays the same; temperature of water while it is solidifying decreases

• temperature of steam while it is condensing stays the same; temperature of water while it is solidifying stays the same

Two states of matter are described as follows.

In state 1, the molecules are very far apart. They move about very quickly at random in straight lines until they hit something.

In state 2, the molecules are quite closely packed together. They move about at random. They do not have fixed positions.

What is state 1 and what is state 2?

• state 1 is gas and state 2 is liquid

• state 1 is gas and state 2 is solid

• state 1 is liquid and state 2 is gas

• state 1 is solid and state 2 is liquid

• A

• B

• C

• D