1. Chemical and Physical Changes

2. Physical Changes
Changes that do not affect the nature or the characteristic properties of a substance
Ex. Breaking glass, phase changes

3. Phase Changes

4. Energy in Phase Changes

5. Chemical Changes
Changes that transform the nature and characteristic properties of a substance
Ex. Burning wood, cooking food,
combustion of gas

6. Signs of a chemical change
Change of colour
Greater changes of heat
Generation of Light
Release of a Gas
Formation of a Precipitate (a solid material forms in a liquid)