Lesson Plan

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Lesson Plan
Grade: Date: 17/01/2026
Subject: Physics
Lesson Topic: understand that amount of substance is an SI base quantity with the base unit mol
Learning Objective/s:
  • Describe the definition of the mole and Avogadro’s constant.
  • Explain why the mole is an SI base quantity and its role linking microscopic and macroscopic worlds.
  • Apply the relationship n = m⁄M to convert between mass and amount of substance.
  • Perform calculations using the mole in example problems and the ideal‑gas equation.
Materials Needed:
  • Projector or interactive whiteboard
  • Slides/PowerPoint covering definitions and examples
  • Worksheet with mole calculations
  • Periodic‑table handouts
  • Calculator or computer lab
 Introduction:
Begin with a quick question: How many water molecules are in a glass of water? Students recall prior work on atomic mass and see the need for a convenient counting unit. Explain that today they will understand the mole as an SI base quantity and identify the success criteria: define the mole, relate it to mass, and solve mole‑based problems.
Lesson Structure:
  1. Do‑now (5'): Students estimate the number of molecules in a familiar sample and write their answer.
  2. Mini‑lecture (10'): Define amount of substance, the mole, Avogadro’s constant, and why it is a base unit.
  3. Interactive demonstration (8'): Visual illustration of the bridge between microscopic particles and macroscopic quantities.
  4. Guided practice (12'): Work through example calculations (water molecules, CO₂ mass) using n = m⁄M.
  5. Gas‑law connection (8'): Briefly apply n in the ideal‑gas equation pV = nRT.
  6. Independent worksheet (12'): Students complete additional mole problems while teacher circulates.
  7. Check for understanding (5'): Quick quiz or exit ticket with one mole calculation.
Conclusion:
Recap the definition of the mole, its fixed value, and how molar mass enables conversions. Students complete an exit ticket converting a given mass to moles. For homework, assign a set of problems involving the ideal‑gas equation and mole calculations.