* Chemical Change: Involves the formation of new substances with different chemical properties. This usually involves breaking and forming new chemical bonds.

* Physical Change: Alters the form or appearance of a substance but doesn't change its chemical composition.

Why ice melting is physical:

* Same Chemical Composition: Ice (H₂O) and liquid water (H₂O) are both made of the same molecules. The arrangement of these molecules changes, but the molecules themselves remain the same.

* Reversible: Freezing water (liquid to solid) is the reverse of melting, demonstrating that the change is simply a change of state.

In essence, melting ice is a change in the state of matter, not a change in the substance itself.