Physical and Chemical Changes

Front

What is a physical change?

Back

A physical change alters the physical properties of a substance without changing its chemical composition, meaning no new substance is formed.

Front

What is a chemical change?

Back

A chemical change results in the formation of one or more new substances with different properties, and it is usually irreversible.

Front

Give an example of a physical change.

Back

Melting butter for popcorn 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 during a physical change?

Back

The substance retains its original chemical identity, and only its physical state or appearance changes.

Front

What happens to the substance during a chemical change?

Back

The original substances are transformed into new substances with different chemical identities.

Front

Is breaking a pencil a physical or chemical change?

Back

Breaking a pencil is a physical change because it does not create a new substance.

Front

Can a chemical change be reversed?

Back

Most chemical changes are not reversible, meaning the original substances cannot be easily restored.

Front

What is an indicator of a chemical change?

Back

Indicators of a chemical change include color change, gas production, temperature change, and the formation of a precipitate.

Front

What is an example of a reversible physical change?

Back

Freezing and melting water is an example of a reversible physical change.