| Lesson Plan |
| Grade: |
Date: 04/03/2026 |
| Subject: Chemistry |
| Lesson Topic: State that some chemical reactions are reversible as shown by the symbol $
ightleftharpoons$ |
Learning Objective/s:
- Describe what a reversible reaction is and represent it using the double‑arrow symbol.
- Explain the concept of dynamic equilibrium and the equality of forward and reverse rates.
- Analyse how changes in concentration, temperature, and pressure shift the equilibrium position.
- Predict the effect of a catalyst on the rate of reaching equilibrium.
- Apply equilibrium concepts to a simple chemical equation (e.g., the Haber process).
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Materials Needed:
- Projector or interactive whiteboard
- Printed handout with reversible‑reaction examples
- Worksheet containing equilibrium‑shift scenarios
- Molecular model kits (optional for gas reactions)
- Whiteboard markers and chart paper
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Introduction:
Begin with a quick question: “Can a chemical reaction ever go backwards?” Connect this to students’ prior knowledge of chemical equations and outline the success criteria – students will be able to identify reversible reactions and explain the equilibrium symbol.
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Lesson Structure:
- Do‑now (5'): Students write a definition of a reversible reaction and draw the double‑arrow symbol; teacher reviews a few responses.
- Mini‑lecture (10'): Explain reversible reactions and dynamic equilibrium using the ammonia synthesis equation on the projector.
- Guided practice (12'): Work through the summary table; students predict equilibrium shifts when conditions change and record answers on the worksheet.
- Interactive demonstration (8'): Show a simulation of concentration/temperature changes on equilibrium; discuss observations.
- Collaborative activity (10'): Small groups analyse a new reaction, decide which factor shifts the equilibrium left or right, and present findings.
- Check for understanding (5'): Quick exit‑ticket quiz with 2‑3 questions on symbols and factors.
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Conclusion:
Recap the five key points about reversible reactions, equilibrium, and the factors that shift it. Collect exit tickets to gauge understanding, and assign homework: complete a worksheet applying Le Chatelier’s principle to three new reactions.
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