1. Physical and Chemical Changes

2. Physical Change
Physical change: a change that occurs that does not change the identity of the substance
Melting ice(change in state or phase)
Freezing Kool-aid
Tearing paper
Boiling water

3. Chemical Changes
Chemical change: a change that occurs causing the identity of the substance to change
Burning
Digesting food
Reacting with other substances
A chemical change is called a chemical reaction

4. Chemical Changes Cont’d
Indicators of a chemical change:
Gives off light
Gives off heat
Produces a gas
Color change
Formation of a precipitate

5. Is it Physical or Chemical?
Change
Physical
Chemical
Melting cheese
Burning wood
Milk souring
Wadding up paper
Bicycle rusting