• Unit 5: States of Matter

    In this unit we explore how matter behaves in terms of the three main phases of matter: solids, liquids, and gases. We investigate gases first, because their properties are described by well-defined equations. Next, we study phase changes, which we describe in terms of a graph known as a phase diagram. We finish this unit with an exploration of the properties of solids.

    Completing this unit should take you approximately 15 hours.

    • 5.1: Gases and Gas Laws

      Gases are unique because we can use simple relations or equations to describe many of their properties. This works because gas particles take up the entire space of the container they inhabit, move fast, and do not interact with each other. We learn later in the unit that this quality is different from the particles in the liquid or solid phase.

    • 5.2: Phase Changes

      In this section, we discuss phase changes, where one substance changes from one phase of matter to another. We are all familiar with this from everyday life. When an ice cube melts, it changes from solid water to liquid water. When we boil water on the stove and see water vapor form, the water is changing from liquid to gas.

    • Unit 5 Assessment