* Physical Change: Melting wax involves a change in the state of matter from solid to liquid. The chemical composition of the wax remains the same. It's just the arrangement of the molecules that changes.
* Reversibility: If you cool the liquid wax down, it will solidify back into its original form. This demonstrates that the process is reversible.
In contrast, a chemical reaction would involve the formation of new substances with different chemical properties. For example, burning wax would be an irreversible chemical change, as the wax reacts with oxygen to produce carbon dioxide, water vapor, and other products.
