* No new substances are formed: When salt (NaCl) dissolves in water, the sodium (Na+) and chloride (Cl-) ions separate and become surrounded by water molecules. The salt itself doesn't change its chemical composition. It simply breaks down into its ions.

* The change is reversible: You can easily recover the salt by evaporating the water.

* No chemical bonds are broken or formed: The dissolving process only involves the interaction of the salt ions with water molecules, not the breaking or forming of chemical bonds within the salt itself.

Key Points:

* Physical changes are changes in the appearance or form of a substance, but not its chemical composition.

* Chemical changes involve the formation of new substances with different chemical properties.