Solids, Liquids, Gases
At the beginning of the unit, students classify materials according to their physical states—solid, liquid, or gas—by observing objects they encounter and use every day. This introduces students to initial characteristics and properties of each physical state. Subsequent lessons explore one or more of these states of matter. In later lessons, students are challenged to consider the classification of a substance as it displays properties of more than one physical state. Through the study of each physical state, as well as comparing and contrasting each state with another, students are able to articulate the properties of solids, liquids, and gases by the unit’s conclusion.