Chemistry·Matter · Atoms, elements & compounds · NSSCO 2.1.1
States of matter, particle theory & diffusion
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Everything is made of tiny moving particles. Learn the kinetic particle theory — how particles are arranged in solids, liquids and gases, why matter melts, boils and freezes, and how particles spread out on their own by diffusion.
What you'll learn in this lesson
By the end you should be able to (NSSCO Chemistry 2.1.1):
- Describe the kinetic particle theory: matter is made of tiny particles in constant motion
- Describe the arrangement, spacing and movement of particles in solids, liquids and gases
- Describe the changes of state (melting, boiling, evaporation, condensation, freezing) in terms of particles and energy
- Explain why gases can be compressed and solids cannot
- Describe diffusion and the factors that affect its rate (temperature and particle mass)
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Quick revision
Revise this in 5 minutes
Miss Rachel and Mike talk through the whole topic — with the figure and working drawn live.
Hands-on lab
Run the ammonia diffusion experiment in the lab