Answer:
Chemical changes involve the formation of a new substance.
Step-by-step explanation:
The main difference between chemical and physical changes is the fact that chemical changes involve the formation of a new substance. When a physical change occurs, this does not lead to bonds being broken or formed. The properties of the elements involve do not change. This includes changes such as changes of state. On the other hand, a chemical change is one in which bonds are broken or formed. Therefore, the elements that are present are turned into a new substance.