Physical and Chemical Changes

Front

What happens to thermal energy when a liquid boils?

Back

Thermal energy (heat) is added.

Front

True or False: Freezing a liquid involves adding thermal energy.

Back

False, freezing involves removing thermal energy.

Front

What happens to thermal energy when a solid melts?

Back

Thermal energy (heat) is added.

Front

What is a physical change?

Back

A physical change keeps the molecular structure of the substance.

Front

What is a chemical change?

Back

A chemical change rearranges the molecular structure of the substance.

Front

True or False: A physical change alters the atomic properties of a substance.

Back

False, it does not alter atomic properties.

Front

What is an example of a physical change?

Back

Melting ice is an example of a physical change.

Front

What is an example of a chemical change?

Back

Rusting of iron is an example of a chemical change.

Front

True or False: Boiling water is a chemical change.

Back

False, boiling water is a physical change.

Front

What occurs during condensation?

Back

Thermal energy is removed from a gas to form a liquid.