* No new substances are formed: When coffee dissolves, the coffee grounds are simply breaking down into smaller particles that disperse throughout the water. The chemical composition of the coffee and water remains the same.

* The change is reversible: You can recover the coffee grounds by evaporating the water. This means the change is not permanent.

* No chemical bonds are broken or formed: The process of dissolving is primarily about the attraction between the coffee molecules and the water molecules, not about the formation of new chemical bonds.

In contrast, a chemical change would involve:

* The formation of new substances with different chemical properties.

* The breaking and forming of chemical bonds.

* The change being irreversible or difficult to reverse.

Let me know if you'd like to explore other examples of physical and chemical changes!