This document discusses properties of matter and the different states of matter. It defines extensive and intensive properties, with examples such as mass and volume being extensive as they depend on amount, while hardness is intensive as it depends on the type of matter not amount. The three states of matter are defined as solid, liquid, and gas. Solids have a definite shape and volume, liquids have an indefinite shape but definite volume, and gases fill their container. During physical changes, some properties change but not the composition.