Physical and Chemical Changes

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

A change that results in the formation of new chemical substances.

Signs include color change, temperature change, formation of a gas, and formation of a precipitate.

The ability of a substance to undergo a chemical change and form new substances.

A characteristic of a substance that can be observed or measured without changing the substance's identity.

Physical change.

Chemical change.

In a chemical reaction, mass is neither created nor destroyed; it is conserved.

The molecules rearrange to form new substances.

Dissolving sugar in water.