1. Review

2. What are 3 physical properties of water?
Colorless
Odorless
Liquid at room temp.
Density of 1.00 g/mL
Freezes at 0°C
Boils at 100°C

3. Two objects both about the same size as an orange
Which has the greater density?

4. Physical Changes

5. Physical Change
a change of matter from one form to another without changing its identity

6. Examples of physical changes…
freezing

7. Examples of physical changes…
Cutting

8. Examples of physical changes…
Crushing/Bending

9. Examples of physical changes…
Dissolving

10. Examples of physical changes…
Melting

11. Examples of physical changes…
Breaking

12. With physical changes…
The shape or appearance may change but it is still the same thing

13. How can I change the physical properties of…

14. How can I change the physical properties of…

15. How can I change the physical properties of…

16. Chemical Properties

17. How would you describe a piece of wood before and after it is burned?

18. Chemical properties
describe a substance’s ability to change into new matter with new properties

19. Examples:
Flammability

20. Examples: Reactivity Iron reacts with oxygen to form rust
Bumper is coated with chromium that is nonreactive with oxygen

21. How do you tell a physical property from a chemical property?
Chemical properties are more difficult to see. Can be observed only when a chemical change might happen

22. A substance always has its chemical properties
You can see that wood is flammable only while it is burning
You can see that gold is nonflammable only when it is non burning
A substance always has its chemical properties

23. What are some chemical properties of water?
Nonflammability
Highly reactive to many metals