Here's why:

* Melting of ice and evaporation of water are both physical changes.

* They involve changes in the state of matter (solid to liquid, liquid to gas), but the chemical composition of the substance (H₂O) remains the same.

A chemical change involves the formation of new substances with different chemical properties. Here are some examples of chemical changes:

* Burning wood

* Rusting of iron

* Baking a cake

Let me know if you'd like more examples!