* No new substances are formed: The ice (water in solid form) simply melts into liquid water. The chemical composition of the water (H₂O) remains the same.

* Change is reversible: You can freeze the water again, returning it to its solid state.

* Change is primarily a change in state: The main change is the physical state of the water, going from solid to liquid.

In contrast, a chemical change involves the formation of new substances with different chemical properties. Examples include:

* Burning wood (wood reacts with oxygen to form ash, carbon dioxide, and other gases)

* Cooking an egg (proteins in the egg change their structure)

* Rusting of iron (iron reacts with oxygen to form iron oxide)