Changes in Matter Study Guide

True or False A(n) liquid does not have a definite shape, but it does have a definite volume.

True

True or False Water vapor is a colorless gas that is impossible to see.

True

What is vaporization?

a liquid becoming a gas

During the process of sublimation,

a solid turns directly into a gas.

A fluid is

a substance that flows.

____________________ occurs when particles in a gas lose enough thermal energy to form a liquid.

condensation

The opposite of vaporization is called

condensation.

An uncovered pot of soup is simmering on a stove, and there are water droplets on the wall above the back of the stove. What sequence can you infer has occurred?

vaporization, then condensation

The resistance of a liquid to flowing is its

viscosity.

In which state of matter are particles packed tightly together in fixed positions?

solid

When an inflated balloon is exposed to cold air,

the volume of the balloon decreases.

When a substance cools, it loses ____________________ energy to its surroundings.

thermal

True or False At its boiling temperature, the particles of a liquid are moving so slowly that they begin to form regular patterns.

F, freezing

True or False Particles in a liquid move around just as freely as particles in a solid.

False, more freely than

True or False Pieces of dry ice (solid carbon dioxide) become smaller through the process of condensation.

False, sublimation

The characteristic temperature at which a pure solid changes to a liquid is its ____________________ point.

melting

Particles of a liquid

are free to move in a container but remain in close contact with one another.

____________________ occurs when a liquid changes to a gas below its surface as well as at the surface.

boiling

A solid is a state of matter that has a(n)

definite volume and a definite shape.

A shrinking puddle is an example of ____________________, or vaporization that takes place only on the surface of a liquid.

evaporation

The change from liquid to solid, or the reverse of melting, is called

freezing.

In which state of matter do the particles spread apart and fill all the space available to them?

gas

Sublimation is the change of a solid directly into a(n) ____________________.

gas

The common state of matter that does not have a definite shape or a definite volume is a(n) ____________________.

gas

Which state of matter undergoes changes in volume most easily?

gas

In a(n) ____________________, the particles are packed closely together, but they can move past each other freely.

liquid