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.

Front

What is a chemical change?

Back

A chemical change is a change that results in the formation of new chemical substances, involving a rearrangement of atoms.

Front

Give an example of a physical change.

Back

Melting a chocolate bar is an example of a physical change.

Front

Give an example of a chemical change.

Back

Fireworks exploding is an example of a chemical change.

Front

What happens to the substance in a physical change?

Back

The substance retains its original properties and composition.

Front

What happens to the substance in a chemical change?

Back

The substance transforms into one or more new substances with different properties.

Front

What is evidence of a physical change?

Back

Evidence of a physical change can include changes in shape, size, or state of matter.

Front

What is evidence of a chemical change?

Back

Evidence of a chemical change can include color change, gas production, temperature change, or the formation of a precipitate.

Front

What is the best example of a new substance forming?

Back

Lighting a match is the best example of a new substance forming.

Front

Can a physical change be reversed?

Back

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