1. What is a Physical Change?
A physical change alters the form of a substance, but does not change it to another substance.
Example:
Making Orange Juice

2. What is a Physical Change?
The matter remains the same.
The original substance is able to be recovered.

3. What is a Chemical Change?
When a substance undergoes a chemical change, it is changed into a different substance with different properties.
Example:
Baking a Cake

4. 5 Signs of a Chemical Change
Color Change
Precipitation

5. Leaves Changing Color
Chlorophyll (green pigment) of the leaves begins to breakdown
Different chemical pigments are produced as a result (yellow, orange, red)
CHEMICAL CHANGE! (Different substance produced)

6. 5 Signs of a Chemical Change
Gas Production
Temperature Change

7. 5 Signs of a Chemical Change
Changes in Characteristic Properties (odor, light given off)

8. Chemical or Physical Change?
Cutting paper?

9. Chemical or Physical Change?
Ice melting?

10. Chemical or Physical Change?
Toast burning?

11. Chemical or Physical Change?
Rocket fuel burning?

12. Chemical or Physical Change?
Sawing wood?

13. Chemical or Physical Change?
Metal rusting?

14. Chemical or Physical Change?
Disappearing puddle?

15. Let Me Explain
With your neighbor, discuss why a disappearing puddle is a physical change. Be ready to share answers!