1. Chemical Changes

2. Clues to Chemical Changes
Could make a sound
Could give off light
Change in odor
Change in color
Could Fizz or foam
the object or liquid could give off heat

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

4. Signs of a Chemical Change
Gas Production
Temperature Change

5. How do I know if a Physical Change occurred or a Chemical Change occurred?
The most important question to ask is did the composition/identity of the substance change?