* No new substances are formed: When starch dissolves in water, the starch molecules disperse throughout the water, but they don't chemically change. They remain starch molecules.

* The change is reversible: You can recover the starch by evaporating the water. The starch will be left behind, unchanged.

* No chemical bonds are broken or formed: The process of dissolving involves the starch molecules being surrounded by water molecules, but no new chemical bonds are created.

In contrast, a chemical change would involve:

* Formation of new substances: The original substances would be transformed into something different.

* Irreversibility: The change cannot be easily reversed.

* Breaking and forming of chemical bonds: The atoms in the original substances would rearrange to form new arrangements.

Let me know if you have any other questions!