Lesson Plan

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Lesson Plan
Grade: Date: 25/02/2026
Subject: Physics
Lesson Topic: use molar quantities where one mole of any substance is the amount containing a number of particles of that substance equal to the Avogadro constant NA
Learning Objective/s:
  • Describe the relationship between mass, moles, molar mass, and number of particles.
  • Apply the equations n = m⁄M and N = n NA to convert between mass, moles, and particles.
  • Perform stoichiometric calculations using molar quantities in physics‑chemistry contexts.
  • Identify and correct common errors when using molar concepts.
Materials Needed:
  • Projector and screen for slides/diagrams
  • Whiteboard and markers
  • Worksheet with conversion problems and self‑check questions
  • Periodic‑table handout
  • Scientific calculators (or calculator apps)
  • Sample data sheet of common molar masses
 Introduction:
Begin with a quick demonstration: ask students how many water molecules are in a drop of water to spark curiosity. Review prior knowledge of mass, units, and the periodic table. State that by the end of the lesson they will reliably convert between mass, moles, and number of particles using Avogadro’s constant.
Lesson Structure:
  1. Do‑Now (5') – Students estimate the number of molecules in a given mass; brief discussion of answers.
  2. Mini‑lecture (10') – Introduce Avogadro constant, mole definition, and key equations; show conversion diagram.
  3. Guided practice (12') – Work through the CO₂ example together while students complete a worksheet.
  4. Independent practice (10') – Pairs solve self‑check questions; teacher circulates to provide feedback.
  5. Concept check (8') – Quick quiz (clicker or show of hands) on common mistakes and unit conversions.
  6. Summary & exit ticket (5') – Students write one conversion they can now perform and one mistake to avoid; collect as retrieval check.
Conclusion:
Recap the core equations linking mass, moles, and particles and emphasize the fixed value of NA. Collect the exit tickets as a retrieval check. Assign homework: complete additional conversion problems from the textbook chapter on the mole.