Front

A state of matter with a definite volume but no definite shape

Back

Liquid

Front

Used to describe a substance that is not chemically reactive

Back

Inert

Front

The smallest particle of an element made of electrons, protons, and neutrons

Back

Atom

Front

A form of matter with indefinite shape and volume

Back

Gas

Front

The simplest unit of a chemical compound that can exist and is formed when two or more atoms join together chemically.

Back

Molecule

Front

To move rhythmically and steadily; oscillate

Back

Vibrate

Front

It is the total kinetic (motion) energy of tiny particles that make up matter. The faster the particles move, the warmer the matter becomes.

Back

Thermal Energy

Front

To strike or hit something with great force

Back

Collide

Front

When a substance changes from a gas into a liquid, what has happened?

Back

Heat has been removed.

Front

How are molecules affected when heat is added?

Back

They vibrate faster.