* Physical properties are characteristics that can be observed or measured without changing the substance's chemical composition. Examples include color, density, melting point, and boiling point.

* Chemical properties describe how a substance reacts with other substances or how it changes its chemical composition.

Acetone is a chemical because it describes how acetone behaves in chemical reactions. For example, it is a solvent and can be used to dissolve certain substances.

Let me know if you'd like more examples!