You're asking about the difference between physical changes and chemical changes! Here's a breakdown:

* Physical Change: A change in the form or appearance of a substance, but not its chemical composition. These changes are usually reversible.

* Examples: Melting ice, boiling water, cutting paper, crushing a can, dissolving sugar in water.

* Chemical Change: A change that results in the formation of a new substance with different chemical properties. These changes are usually irreversible.

* Examples: Burning wood, cooking an egg, rusting iron, baking a cake, digesting food.

Therefore, the change that is NOT a physical change is a chemical change.