Educational worksheet illustrating the states of matter and phase changes, including diagrams of solid, liquid, and gas, questions on heat energy, and thermometers showing the freezing and boiling points of water.

Diagrams showing atoms or molecules of a gas, solid, and liquid, with explanations for each state of matter, followed by questions about heat energy changes and the melting and boiling points of water, and two thermometer images showing the freezing and boiling points of water on the Celsius scale.