Front

What is a gas?

Back

A gas has fast moving molecules.

Front

What phase change occurs when a liquid turns into a gas?

Back

Evaporation.

Front

Which state of matter has no definite shape but a definite volume?

Back

Liquid.

Front

What is required for changes in the state of matter?

Back

Energy.

Front

What is the process called when a solid turns directly into a gas?

Back

Sublimation.

Front

What is a solid?

Back

A solid has a definite shape and volume.

Front

What is a liquid?

Back

A liquid has a definite volume but no definite shape.

Front

What happens to molecules in a gas?

Back

They move very fast and are far apart.

Front

What is freezing?

Back

The process of a liquid turning into a solid.

Front

What is melting?

Back

The process of a solid turning into a liquid.