The substance gets larger. The substance changes phases. The substance changes shape. The substance forms a new substance.
I gave my students this multiple choice question: Which of these must occur when a substance goes through a chemical change?

Only one answer is correct among these 4 choices:
- The substance gets larger.
- The substance changes phases.
- The substance changes shape.
- The substance forms a new substance.

Could you tell me which one is correct?

The substance forms a new substance.