when two solutions are mixed and a new color is observed is this color change an indication that a chemical reaction has occurred? Explain why?

Answer 1

Some things you will notice if a chemical reaction has occurred is
1. heat is evolved.
2. a precipitate is formed.
3. a color change occurs.
4. light is emitted.
5. a gas is evolved (bubbles in an aqueous phase).
If any of these things appear you know a different compound(s) has formed.