Changes in Energy at the Molecular Level

Front

What is the state of matter where molecules are spaced far apart and only collide occasionally?

Back

Gas

Front

What is the definition of a liquid?

Back

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

Front

What are the freezing and boiling points of water in Celsius?

Back

0°C and 100°C

Front

What happens to particles as temperature increases?

Back

They speed up.

Front

What is the best definition of temperature?

Back

A measure of how fast the molecules are moving in a substance.

Front

What is a solid?

Back

A state of matter with a definite shape and volume.

Front

What happens to the energy of molecules when a substance is heated?

Back

The energy increases, causing the molecules to move faster.

Front

What is the process called when a liquid turns into a gas?

Back

Evaporation.

Front

What is the process called when a gas turns into a liquid?

Back

Condensation.

Front

What is the term for the amount of energy needed to change a substance from solid to liquid?

Back

Heat of fusion.