* Physical Changes: Alter the form or appearance of a substance but don't change its chemical composition.

* Chemical Changes: Result in the formation of new substances with different chemical properties.

In the case of evaporation:

* Filtrate: This is the liquid that passes through a filter. It likely contains dissolved substances.

* Evaporation: This involves the change of state from liquid to gas (water vapor).

* Dryness: The water molecules have been removed, leaving behind the dissolved substances.

Key Point: The chemical composition of the dissolved substances in the filtrate hasn't changed. You're simply removing the water solvent.

Example: If you evaporate saltwater, you'll be left with salt crystals. The salt (NaCl) remains chemically the same.