The substance was heated. The shape of the substance changed. The volume of the substance changed. The substance changed into a new substance.
I am hesitating between 4 options to answer the following question, which option should I choose?
Question: When a scientist performs an experiment, there are many changes that can occur. Which observation should she list as a chemical change?
Possibilities:
- The substance was heated.
- The shape of the substance changed.
- The volume of the substance changed.
- The substance changed into a new substance.

The substance changed into a new substance.