Physical and Chemical Changes

Front

What is a physical change?

Back

A physical change changes the physical properties of an object, but does not create a new substance.

Front

What is a chemical change?

Back

A chemical change creates a new substance and cannot be undone.

Front

Give an example of a physical change.

Back

Melting ice is an example of a physical change.

Front

Give an example of a chemical change.

Back

Burning wood is an example of a chemical change.

Front

What happens to the substance in a physical change?

Back

The substance remains the same, only its form or appearance changes.

Front

What happens to the substance in a chemical change?

Back

The substance changes into a different substance with different properties.

Front

Can physical changes be reversed?

Back

Yes, many physical changes can be reversed, like freezing and melting.

Front

Can chemical changes be reversed?

Back

No, chemical changes usually cannot be reversed without another chemical reaction.

Front

What is an example of a reversible physical change?

Back

Dissolving sugar in water is a reversible physical change.

Front

What is an example of an irreversible chemical change?

Back

Rusting of iron is an example of an irreversible chemical change.