1. Physical & Chemical Change

2. Physical Change: a change in which no new substance is produced e.g.

3. Physical & Chemical Change Physical Change: a change in which no new substance is produced e.g. breaking glass tearing paper boiling water

4. Physical & Chemical Change Physical Change: a change in which no new substance is produced e.g. breaking glass tearing paper boiling water Chemical Change: a change in which a new, chemically different, substance is produced e.g.

5. Physical & Chemical Change Physical Change: a change in which no new substance is produced e.g. breaking glass tearing paper boiling water Chemical Change: a change in which a new, chemically different, substance is produced e.g. burning wood exploding a bomb corroding with acid

6. Physical & Chemical Change Evidence of a Chemical Change:

7. Physical & Chemical Change Evidence of a Chemical Change: 1. colour change

8. Physical & Chemical Change Evidence of a Chemical Change: 1. colour change 2. heat produced or absorbed

9. Physical & Chemical Change Evidence of a Chemical Change: 1. colour change 2. heat produced or absorbed 3. gas is produced

10. Physical & Chemical Change Evidence of a Chemical Change: 1. colour change 2. heat produced or absorbed 3. gas is produced 4. a precipitate (solid from two liquids) forms

11. Physical & Chemical Change Evidence of a Chemical Change: 1. colour change 2. heat produced or absorbed 3. gas is produced 4. a precipitate (solid from two liquids) forms 5. light is produced

12. Physical & Chemical Change Evidence of a Chemical Change: 1. colour change 2. heat produced or absorbed 3. gas is produced 4. a precipitate (solid from two liquids) forms 5. light is produced What about a light bulb?

13. Physical & Chemical Change Evidence of a Chemical Change: 1. colour change 2. heat produced or absorbed 3. gas is produced 4. a precipitate (solid from two liquids) forms 5. light is produced What about a light bulb? -colour change -heat produced -light produced

14. Physical & Chemical Change Evidence of a Chemical Change: 1. colour change 2. heat produced or absorbed 3. gas is produced 4. a precipitate (solid from two liquids) forms 5. light is produced What about a light bulb? -colour change -heat produced -light produced But... when turned off, it's still a light bulb! NOT A CHEMICAL CHANGE...

15. Physical & Chemical Change Evidence of a Chemical Change: 1. colour change 2. heat produced or absorbed 3. gas is produced 4. a precipitate (solid from two liquids) forms 5. light is produced Bottom line: a new, chemically different substance has to be produced