Lesson Plan: States of matter– Diffusion (O Levels/IGCSE)
Lesson 1: Diffusion and Kinetic Particle Theory
| Section | Details |
|---|---|
| Objective | Describe and explain diffusion in terms of kinetic particle theory. |
| Activities | – Starter (5 mins): Demonstration: Spray perfume at one end of the room; students describe how they can smell it over time.- Main (25 mins): Explain diffusion using particle motion (high concentration to low concentration). Show an animation of gas particles diffusing. Discuss real-life examples (e.g., cooking smells, tea diffusing in water).- Plenary (10 mins): Q&A session: Why does diffusion occur faster in gases than in liquids? |
| Resources | Perfume spray, diffusion animation/video, Cambridge IGCSE Chemistry textbook. |
| Time | 40 minutes total: 5 mins (Starter) + 25 mins (Main) + 10 mins (Plenary). |
| Homework | Research and write down three examples of diffusion in daily life. |
| Assessment | Students complete a short worksheet explaining diffusion using kinetic particle theory. |
| Past Paper Practice | IGCSE Chemistry 0620/41/M/J/20 Q1(d) – Explaining diffusion using kinetic particle theory. |
Lesson 2: Effect of Relative Molecular Mass on Diffusion
| Section | Details |
|---|---|
| Objective | Describe and explain the effect of relative molecular mass on the rate of diffusion of gases. |
| Activities | – Starter (5 mins): Discuss: Why does helium escape from balloons faster than oxygen?- Main (25 mins): Conduct a demonstration with two gases of different molecular masses (e.g., ammonia and hydrogen chloride in a glass tube) to show diffusion rates. Explain how lighter gases diffuse faster due to higher velocity (using Graham’s Law conceptually).- Plenary (10 mins): Students analyze the demonstration and explain their observations. |
| Resources | Glass tube, cotton soaked in ammonia and hydrochloric acid, stopwatches, diagrams of molecular mass. |
| Time | 40 minutes total: 5 mins (Starter) + 25 mins (Main) + 10 mins (Plenary). |
| Homework | Solve numerical problems to compare diffusion rates of two gases using relative molecular mass. |
| Assessment | Quiz: Explain why hydrogen diffuses faster than oxygen with reference to molecular mass. |
| Past Paper Practice | IGCSE Chemistry 0620/41/O/N/19 Q1(c) – Effect of molecular mass on diffusion. |
Notes for Teachers:
- Ensure demonstrations are performed safely and in a well-ventilated area.
- Use animations or videos if certain resources (e.g., glass tubes) are unavailable.
- Encourage students to relate diffusion to real-world scenarios to solidify understanding.
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