This document defines and provides examples of different types of matter including pure substances, mixtures, elements, compounds, and properties. It explains that a pure substance is homogeneous and cannot be separated further, while a mixture contains two or more substances that can be separated. Mixtures are either heterogeneous, with a varying composition, or homogeneous, with an even composition throughout. Elements contain one type of atom, while compounds contain more than one type of element. Chemical and physical properties and changes in states of matter are also defined.