Physical and Chemical Changes

1. 8th Grade Science Ms. Ward Physical and Chemical Changes

2. Take out a sheet of paper and answer the bell ringer question. • Do you think crumpling a piece of paper is an example of a chemical change or a physical change?  Explain your thinking. 2

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

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

5. Color Change Precipitation 5 Signs of a Chemical Change

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

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

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

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

10. Sawing wood? Physical Chemical or Physical Change?

11. Metal rusting? Chemical Chemical or Physical Change?

12. Disappearing puddle? Physical Chemical or Physical Change?

13. Candle burning? Chemical Chemical or Physical Change?

14. Dry ice? Physical Chemical or Physical Change?

16. Independent Practice • Write one example each of physical and chemical changes. Give evidence that your examples are chemical or physical changes.

17. Pop Quiz