What Are 9 Observations That A Chemical Change Has Occurred?

1. Colour Changes
2. Smell Changes
3. Temperature Changes
4. Bubbles Appear
5. It Becomes Hard / Impossible to Reverse
6. Heat or Light is given off
7. Clearness Changes

1. Colour changes
2. Bubbles form
3. It is hard, or almost impossible to reverse
4. The smell changes
5. Clearness/fogginess changes
6. Heat or light is given off

..that's all I know.

If the mixture has formed into a solid or a gas

jj