| Lesson Plan |
| Grade: |
Date: 25/02/2026 |
| Subject: Chemistry |
| Lesson Topic: State the symbol equation for the conversion of sulfur dioxide to sulfur trioxide in the Contact process, $2 \mathrm{SO}_2(\mathrm{~g})+\mathrm{O}_2(\mathrm{~g}) \rightleftharpoons 2 \mathrm{SO}_3(\mathrm{~g})$ |
Learning Objective/s:
- State the balanced symbol equation for the conversion of SO₂ to SO₃ in the Contact process.
- Explain how changes in concentration, temperature, pressure, and catalyst affect the equilibrium position.
- Apply Le Châtelier’s principle to predict the effect of varying conditions on SO₃ yield.
- Interpret equilibrium tables to determine the direction of shift.
- Solve typical exam questions involving the Contact process equilibrium.
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Materials Needed:
- Projector or interactive whiteboard
- Slides/PowerPoint on the Contact process
- Handout with equilibrium tables and practice questions
- Whiteboard markers and chart paper
- Diagram of energy profile (printed or digital)
- Clickers or online quiz tool for quick checks
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Introduction:
Begin with a quick recall question: “What is the balanced equation for the Contact process?” Connect this to students’ prior knowledge of reversible reactions and set the success criteria – students will be able to write the equation and explain how conditions shift equilibrium.
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Lesson Structure:
- Do‑now (5') – Students write the balanced equation from memory; teacher collects a few responses.
- Mini‑lecture (10') – Review reversible reactions and Le Châtelier’s principle using slides.
- Guided analysis (12') – Work through the equilibrium table; predict effects of changing pressure, temperature, and concentrations.
- Demonstration/video (8') – Short animation of the Contact process and V₂O₅ catalyst action.
- Collaborative worksheet (10') – Groups answer questions on how each factor shifts the equilibrium; share answers.
- Exit ticket (5') – Write: “If pressure is increased, what happens to SO₃ yield and why?”
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Conclusion:
Recap the key points: the balanced equation, the factors that shift equilibrium, and the direction of shift for each. Collect the exit tickets as a retrieval check and assign a short homework task to complete a set of equilibrium‑shift problems.
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