Question

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.

Answer 1

B) Heat is given off

Step-by-step explanation:

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.

Answer 2

The answer would be B, heat is given off. Steam, bubbling, and fizzing can also indicate that a chemical change is occurring.