Answer:
composition changes
Explanation:
The main difference between physical and chemical changes is the following:
- in a physical change, no new substances are formed, while the atoms/molecules of the original substances can be re-arranged. Examples of physical changes are the change of state (for instance, from solid to liquid): no new substance are formed, but the bonds between molecules are broken and the molecules change position/arrangement.
- in a chemical change, new substances are formed: an example of this change are chemical reaction, such as the burning of a substance, in which new substances are formed. For this reason, the composition changes during a chemical change.
