Flowchart showing the classification of matter into materials, states, and pure substances.

A flowchart illustrating the classification of matter, showing how matter is made up of materials, which can be heterogeneous or homogeneous. Homogeneous materials can be solutions or pure substances, with pure substances composed of compounds (made of two or more different elements) and elements (made of atoms). Matter also consists of states: solids, liquids, and gases.