States of Matter Interactive Lesson
Explore solids, liquids, gases, diffusion, heating curves and gas pressure using interactive simulations and a 40-question assessment.
Student Information
Lesson Progress
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Learning Objectives
Interactive Particle Simulator
Select a state of matter to compare particle arrangement, movement and spacing.
Solid: particles vibrate about fixed positions.
Compare the States
Solid
Fixed shape and fixed volume. Particles are close together in a regular arrangement and vibrate.
Liquid
Fixed volume but no fixed shape. Particles are close together and move past each other.
Gas
No fixed shape or volume. Particles are far apart and move rapidly in random directions.
Changes of State Activity
Drag each process into the correct category.
Heating / Endothermic
Cooling / Exothermic
Heating Curve Explorer
Flat sections show changes of state. Energy is used to overcome attractive forces rather than increase temperature.
Diffusion Investigation
Increase temperature to model faster diffusion.
Gas Pressure Simulator
Move the piston. Smaller volume gives more frequent collisions and higher pressure.
Video Lesson
Worked Summary
| Process | Change | Energy |
|---|---|---|
| Melting | Solid → Liquid | Endothermic |
| Boiling / Evaporation | Liquid → Gas | Endothermic |
| Condensation | Gas → Liquid | Exothermic |
| Freezing | Liquid → Solid | Exothermic |
40-Question Assessment
Each question is worth 1 mark. Submit to see your score, correct answers and explanations.
0 of 40 answered
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