Question

1. Does this reaction absorb or release energy? How do you know?
2. What do the color changes indicate?

Answer 1

What reaction?

A color change indicates that a reaction has occurred.

But no one can help you until you actually write the reaction that you're asking about.

Answer 2

Spatcher is right. For you to get help you need to tell us what. Chemical Reactions is what Color change indicates.

Answer 3

An iron nail (Fe) is placed into a solution of copper(II) sulfate (CuSO4). After some time, the blue color of the copper(II) sulfate disappears and some copper-colored solid(Cu) is found on the surface of the nail. The solution now contains iron(II) sulfate (FeSO4), and the container feels warmer than before the reaction.
1. Does this reaction absorb or release energy? How do you know?
2. What do the color changes indicate?

Answer 4

The Color indicates a Chemical Reaction. As for the 1st question it depends if your talking about electricity or heat. If so yes :)