Here's the breakdown:

* Physical properties are characteristics of a substance that can be observed or measured without changing the substance's chemical composition. Examples include:

* Color

* Odor

* Density

* Melting point

* Boiling point

* Solubility

* Conductivity

* State of matter (solid, liquid, gas)

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

* Flammability

* Reactivity with acids

* Ability to oxidize or reduce

* pH

In simpler terms, physical properties tell you what a substance *is like*, while chemical properties tell you what a substance *does*.