Phase Change 5 703

Front

What is a phase change?

Back

A phase change is a transition of matter from one state (solid, liquid, gas) to another due to changes in energy or temperature.

Front

What happens to molecules during a phase change from solid to liquid?

Back

The molecules gain energy, move faster, and overcome some of their attractions, allowing them to move around each other.

Front

What happens to molecules during a phase change from liquid to solid?

Back

The molecules lose energy, move slower, and their attractions pull them closer together, causing them to move in place.

Front

What is the state of matter where molecules are tightly packed and only vibrate in place?

Back

Solid.

Front

What is the state of matter where molecules are close together but can move around each other?

Back

Liquid.

Front

What is the state of matter where molecules are far apart and move freely?

Back

Gas.

Front

What is the term for the energy required to change a substance from solid to liquid?

Back

Heat of fusion.

Front

What is the term for the energy required to change a substance from liquid to gas?

Back

Heat of vaporization.

Front

What is an example of a substance that changes from solid to liquid when heated?

Back

Ice melting into water.

Front

What is an example of a substance that changes from liquid to gas when heated?

Back

Water boiling into steam.