Lesson Plan

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Lesson Plan
Grade: Date: 17/01/2026
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).
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
 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.
Lesson Structure:
  1. Do‑now (5'): Students write a definition of a reversible reaction and draw the double‑arrow symbol; teacher reviews a few responses.
  2. Mini‑lecture (10'): Explain reversible reactions and dynamic equilibrium using the ammonia synthesis equation on the projector.
  3. Guided practice (12'): Work through the summary table; students predict equilibrium shifts when conditions change and record answers on the worksheet.
  4. Interactive demonstration (8'): Show a simulation of concentration/temperature changes on equilibrium; discuss observations.
  5. Collaborative activity (10'): Small groups analyse a new reaction, decide which factor shifts the equilibrium left or right, and present findings.
  6. Check for understanding (5'): Quick exit‑ticket quiz with 2‑3 questions on symbols and factors.
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.