List 4 observations that suggest a chemical change is occurring

1. The evolution of energy

2. the production of a gas

3. the formation of a precipitate

4. color change

1. Creation of different compounds. (Since a chemical change is one in which the arrangement of atoms changes.)

2. Color change. (Because if a new compound is formed, its color can be different from the original compound)

3. Cannot be reversed by reversing the condition.

4. In most cases, a gas is formed.