1. Physical and Chemical Changes

2. What is a Physical Change? A physical change changes the form of a substance, but does not create anything new. Starting Substance = ending substance Example: Making Orange Juice An ice cube melting

3. What is a Chemical Change? Substances are changed into something new with different properties that the original substance. Starting substance = something new Example: Baking a Cake Wood burning

4. 5 Signs of a Chemical Change 1. Color Change 2. Precipitation

5. Precipitation Precipitation – the solid that forms from a solution during a chemical reaction. It looks like a cloudy solid in an otherwise clear solution.

6. 5 Signs of a Chemical Change 3. Gas Production 4. Temperature Change

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

8. Chemical or Physical Change? Cutting paper? Physical

9. Chemical or Physical Change? Ice melting? Physical

10. Chemical or Physical Change? Toast burning? Chemical

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

12. Chemical or Physical Change? Sawing wood? Physical

13. Chemical or Physical Change? Metal rusting? Chemical

14. Chemical or Physical Change? Disappearing puddle? Physical

15. Chemical or Physical Change? Candle burning? Chemical

16. Chemical or Physical Change? Dry ice? Physical