Physical and Chemical Changes

Front

What is a physical change?

Back

A physical change is a change that affects one or more physical properties of a substance without altering its chemical composition. Examples include melting, freezing, and dissolving.

Front

What is a chemical change?

Back

A chemical change is a change that results in the formation of new chemical substances. Examples include burning, rusting, and photosynthesis.

Front

Is inflating a tire a physical or chemical change?

Back

Inflating a tire is a physical change.

Front

What happens to the properties of a substance during a physical change?

Back

The properties of a substance may change, but its chemical composition remains the same.

Front

What happens to the properties of a substance during a chemical change?

Back

The properties of a substance change, and new substances with different chemical compositions are formed.

Front

Is hammering wood to build a treehouse a physical or chemical change?

Back

Hammering wood to build a treehouse is a physical change.

Front

What is an example of a physical change involving temperature?

Back

Freezing juice is an example of a physical change involving temperature.

Front

What is photosynthesis an example of?

Back

Photosynthesis is an example of a chemical change.

Front

Can a physical change be reversed?

Back

Many physical changes can be reversed, such as melting and freezing.

Front

Can a chemical change be reversed?

Back

Chemical changes are usually not reversible by simple physical means.