When determining whether a chemical reaction has taken place, you observe and look for several indicators. Which would be considered an indication that a chemical reaction or chemical change has taken place?
A) Solid melts.
B) Heat is given off.
C) Substance dissolves
D) Substance changes shape.
Here's why: Heat is given off represents a chemical change reactions can give off. Dissolving, melting, and changing shape are all example of physical changes.
