Step-by-step explanation:
A chemical change is one in which a new kind of matter has formed. It involves chemical reactions occurring within a given substance. For the mashed potato, some of the observations might be;
- Turning into liquid of the mash
- Also, the process cannot be reversed
- There might have been a mass change
- The odor comes from the new products that are formed which is from a gas released from the decomposition of the mashed potato.