1. Physical versus Chemical Properties

2. What is a property? Property: a characteristic of a substance that can be observed

3. Physical Property Physical property: a property that can be observed without changing the identity of the substance.

4. Special Physical Properties Boiling point: the temperature at which a substance changes from a liquid to a gas at a given pressure water = 100 o C

5. Special Physical Properties Melting point: the temperature at which a substance changes from a solid to a liquid at a given pressure water = 0 o C

6. Evidence of a Physical Change/Interaction Change in Shape Size State Texture

7. Chemical Properties Chemical property: a property that can only be observed by changing the identity of the substance; the substance cannot be resorted to its original state

8. Evidence of a Chemical Change/Interaction Evidence of Chemical Change: Color change Temperature change New odor Formation of a gas Rust