Physical and Chemical Changes

Front

What is a chemical change?

Back

A change in which new substances are formed.

Front

What is a physical change?

Back

A change that does not alter the chemical composition of a substance.

Front

Give an example of a physical change.

Back

Melting ice.

Front

Give an example of a chemical change.

Back

Burning wood.

Front

What is the Law of Conservation of Mass?

Back

Mass is never created or destroyed in a chemical reaction.

Front

What happens to the mass of substances during a chemical reaction?

Back

The total mass remains constant.

Front

What is an indicator of a chemical change?

Back

Color change, gas production, or temperature change.

Front

What is an indicator of a physical change?

Back

Change in state, such as melting or freezing.

Front

Can a physical change be reversed?

Back

Yes, many physical changes can be reversed.

Front

Can a chemical change be reversed?

Back

Generally, chemical changes are not easily reversible.