Educational worksheet illustrating the states of matter and phase changes, including diagrams and questions about melting and boiling points.

Three diagrams showing atoms or molecules of a gas, solid, and liquid, with explanations for each state of matter. Day 1 includes labeled diagrams for solid, liquid, and gas states. Day 2 has fill-in-the-blank questions about heat energy and phase changes. Day 3 features two thermometers with shaded melting and boiling points for water on the Celsius scale.