1. Physical and Chemical Change

2. Physical Change A change is physical if the reaction:
does not make a new product
is a change of state
eg. Solid to liquid, etc.
Eg. Ice melting, cutting grass, ripping a piece of paper

3. Chemical Change A change is chemical if the reaction:
makes a new product (irreversible)
produces heat or light
produces bubbles of gas
forms a precipitate (solid forming on the bottom in a liquid
produces a colour change

4. Physical and Chemical Change
To explain whether a chemical reaction is physical or chemical, you may be able to use more than one of the statements
For each scenario, call it a physical change (P) or a chemical change (C) and explain why!

5. Examples
YouTube clips:

6. Examples Frying an egg - C; irreversible, colour change Boiling water
- P; change of state, reversible
Rotting leaves

7. More Examples Magnesium burns bright white
- C; heat/light given off, irreversible
Breaking a piece of chalk
- P; no new product formed
Dissolve salt in a glass of water
- P; reversible (by distillation)