Phase Change 1 701

Front

What is a solid?

Back

A state of matter in which the particles are locked in position and can only move in place.

Front

What happens to molecules when energy is added to a substance during a phase change?

Back

The molecules move faster, and the substance may change to a gas.

Front

What is a physical change?

Back

A change that affects one or more physical properties of a substance without altering its chemical composition.

Front

What phase are molecules in when they are closely packed but can slide past each other?

Back

Liquid.

Front

What is freezing?

Back

The process that occurs when a liquid changes to a solid.

Front

What is evaporation?

Back

The process by which molecules in a liquid gain enough energy to enter the gas phase.

Front

What is condensation?

Back

The process by which gas molecules lose energy and transition into the liquid phase.

Front

What is melting?

Back

The process that occurs when a solid changes to a liquid.

Front

What is a gas?

Back

A state of matter in which the particles are far apart and move freely.

Front

What is a phase change?

Back

A transition of matter from one state to another, such as solid to liquid or liquid to gas.