* Chemical properties describe how a substance reacts with other substances or changes its chemical composition. For example, flammability (how easily something burns) is a chemical property.

* Physical properties can be observed or measured without changing the substance's chemical composition. Melting point is a measure of the temperature at which a substance changes from solid to liquid. It doesn't change the substance's chemical makeup, just its physical state.

Think of it this way:

* Chemical change: Burning wood changes it into ash and gases.

* Physical change: Melting ice changes it from solid to liquid, but it's still water (H₂O).