* Physical Change: A physical change alters the form or appearance of a substance but doesn't change its chemical composition.

* Chemical Change: A chemical change results in the formation of new substances with different chemical properties.

Grinding CuSO4·5H2O (Copper(II) Sulfate Pentahydrate) only breaks down the solid into smaller particles. The chemical composition, which includes the copper sulfate and water molecules, remains the same.

Here's how to think about it:

* Before grinding: You have large crystals of CuSO4·5H2O.

* After grinding: You have smaller particles of CuSO4·5H2O.

The chemical formula (CuSO4·5H2O) is unchanged. The change is purely physical (change in size and shape).