Physical & Chemical Properties & Changes

Front

What is a chemical change?

Back

A process where new substances are formed, often accompanied by energy changes, color changes, gas production, or precipitate formation.

Front

What is a physical change?

Back

A change that affects one or more physical properties of a substance without altering its chemical composition.

Front

Give an example of a chemical change.

Back

Burning wood, which produces ash and smoke.

Front

Give an example of a physical change.

Back

Melting ice into water.

Front

What happens to the molecules during a chemical change?

Back

The molecules rearrange to form new substances.

Front

What happens to the molecules during a physical change?

Back

The molecules remain the same but may change in form or appearance.

Front

What is evidence of a chemical change?

Back

Color change, gas production, temperature change, or formation of a precipitate.

Front

What is evidence of a physical change?

Back

Change in state (like melting or freezing), shape, or size without new substances being formed.

Front

Is rusting of iron a physical or chemical change?

Back

Chemical change, as it forms a new substance (rust).

Front

Is dissolving sugar in water a physical or chemical change?

Back

Physical change, as the sugar can be recovered by evaporation.