Classify each of the following changes in matter as physical [P] or chemical [C].

Grinding chalk into powder [P]
Dissolving salt in water [P]
Dissolving zinc in acid [C]
Tearing a piece of paper [P]
Stretching copper into wire [P]
Burning gasoline [C]
Hammering gold into foil [P]
Melting ice [P]
Digesting food [C]
Making hydrogen from water [C]