What are the four signs of a chemical reaction?

1) color change2) temperature change3) different or new odor4) Gas bubbles forming (unless water is boiling)

Bubbles indicate either an increase in heat causing one of the reactants to boil or the production of a gas. Both of these are indications of a chemical reaction.

yes

1. Color Change 2. Property Change 3. Temperature Change 4. Gas Formation 5. Solid Formation

Fire, Gases