1. Observable Characteristics of Chemical Changes

2. 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

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. What is a Chemical Change?
In a chemical change, a new substance is created. It is difficult (if not impossible) to reverse many chemical changes.
Example:
Baking a Cake

5. Signs of a Chemical Change
Precipitation
A solid is formed in a solution during a chemical reaction.
It looks like a cloudy solid in an otherwise clear solution.

6. Signs of a Chemical Change
Gas Production
Gases are often released out of liquids, creating bubbles

7. Signs of a Chemical Change
Energy Changes
Temperature change or emission of light

8. Signs of a Chemical Change
Changes in Characteristic Properties
Change in color
Change in smell

9. Chemical or Physical Change?
Cutting paper?
Physical

10. Chemical or Physical Change?
Ice melting?
Physical

11. Chemical or Physical Change?
Toast burning?
Chemical

12. Chemical or Physical Change?
Rocket fuel burning?
Chemical

13. Chemical or Physical Change?
Sawing wood?
Physical

14. Chemical or Physical Change?
Metal rusting?
Chemical

15. Chemical or Physical Change?
Disappearing puddle?
Physical

16. Chemical or Physical Change?
Candle burning?
Chemical

17. Chemical or Physical Change?
Dry ice?
Physical