1. Physical and Chemical Changes

2. Physical Changes Alter the physical properties of a substance
DOES NOT change the identity of the substance

3. A physical change does not produce a new substance.
Many physical changes can be reversed

4. Physical Change

5. Chemical Changes
Substance is changed into a new substance with different properties.
The identity of the substance IS changed.
A reaction takes place creating a new substance.

6. Unlike a physical change…
Chemical changes are very difficult or impossible to reverse

9. Heat or Light is given off.

10. A new odor is made.