CH. 3 Section 3.3 Phase Changes Study Guide

The phase change in which a substance changes from a gas into a liquid is called _____________

Condensation

What is deposition?

Deposition is the phase change in which a substance changes directly from a gas to a solid without changing to a liquid first.

Dry ice can change directly from a solid to a gas without forming a liquid first. This process is an example of ______________________

Sublimation

the pressure caused by the collisions of particles in a vapor with the walls of a container.

Vapor Pressure

When liquid water freezes, the average kinetic energy of its molecules_____________ , and the arrangement of the molecules becomes more orderly.

decreases

What describes the behavior of a substance during a phase change.

either absorbs or releases energy.

Vaporization is the phase change in which a substance changes from a(n)_____ into_______a(n) .

liquid; gas

A substance absorbs energy from its surroundings during a(n) ______________change.

endothermic

As water freezes, it releases heat to its surroundings. Freezing is an example of a(n) ___________ change.

exothermic

The energy absorbed by one gram of ice as it melts is known as the______________ for water.

heat of fusion

Is the following sentence TRUE or FALSE? Water molecules have a more orderly arrangement in ice than in liquid water.

true

Is the following sentence TRUE or FALSE? When water vapor collects above the liquid in a closed container, the pressure caused by the collisions of this vapor and the walls of the container is called vapor pressure.

true

What is a phase change?

A phase change is the reversible physical change that takes place when a substance changes from one state of matter to another.

the process that changes a substance from a liquid to a gas at temperatures below the substance's boiling point.

Evaporation

What happens to the temperature of a substance during a phase change?

The temperature of a substance remains constant during a phase change.

Is the following sentence TRUE or FALSE? A gas absorbs energy as it changes into a liquid.

false

Is the following sentence TRUE or FALSE? The temperature at which a substance freezes is lower than the temperature at which it melts.

false

The energy absorbed by one gram of water as it changes from its liquid phase into water vapor is known as the ______________________for water

heat of vaporization