Physical & Chemical Properties & Changes

Front

What is a physical change?

Back

A physical change alters the physical properties of a substance but does not change 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 often cannot be reversed.

Front

Give an example of a physical change.

Back

Crumpling paper 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, as it produces ash and smoke.

Front

What evidence indicates a chemical change has occurred?

Back

Evidence of a chemical change includes color change, gas production (bubbles), temperature change, and formation of a precipitate.

Front

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

Back

The properties of a substance may change (like shape or state), but its chemical identity remains the same.

Front

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

Back

The properties of a substance change completely, resulting in new substances with different chemical identities.

Front

Is dissolving salt in water a physical or chemical change?

Back

Dissolving salt in water is a physical change because the salt can be recovered by evaporating the water.

Front

What is an example of a reversible physical change?

Back

Melting ice into water is a reversible physical change.

Front

What is an example of an irreversible chemical change?

Back

Baking a cake is an example of an irreversible chemical change.