| Lesson Plan |
| Grade: |
Date: 03/03/2026 |
| Subject: Chemistry |
| Lesson Topic: Electrochemistry: electrolysis, redox processes, standard electrode potentials, fuel cells |
Learning Objective/s:
- Describe the roles of anode, cathode, and electrolyte in electrolysis and predict product distribution.
- Write, balance, and combine half‑reactions to produce complete redox equations.
- Calculate standard cell potentials and use the Nernst equation to assess spontaneity under non‑standard conditions.
- Explain the operation of a hydrogen‑oxygen fuel cell and determine its theoretical voltage.
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Materials Needed:
- Projector and screen
- Whiteboard and markers
- Electrolysis demonstration kit (electrodes, power supply, electrolyte solutions)
- Handout of standard electrode potentials
- Worksheet for redox balancing and Nernst calculations
- Fuel‑cell diagram (PEM) printed for each group
- Calculators
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Introduction:
Begin with the question, “How could a car run on only hydrogen and oxygen?” Connect this to students’ prior knowledge of oxidation‑reduction reactions and set the success criteria: students will identify half‑reactions, calculate cell potentials, and explain fuel‑cell operation.
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Lesson Structure:
- Do‑now (5'): Quick quiz on oxidation numbers and identifying oxidising/reducing agents.
- Mini‑lecture (10'): Key concepts of electrolysis – anode, cathode, electrolyte, over‑potential.
- Guided practice (10'): Write half‑reactions for given electrolytes and predict products.
- Demonstration (5'): Simple electrolysis set‑up; students observe gas evolution.
- Redox balancing activity (10'): Balance the MnO₄⁻ + Fe²⁺ reaction in acidic medium.
- Standard potentials exercise (10'): Calculate E°cell for several cell reactions using the handout.
- Nernst equation workshop (10'): Solve problems with given Q values and temperatures.
- Fuel‑cell discussion (10'): Explain PEM fuel‑cell operation, write half‑reactions, and compute theoretical voltage.
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Conclusion:
Recap the four main ideas: electrolysis set‑up, redox balancing, cell potential calculations, and fuel‑cell fundamentals. Exit ticket: students write one real‑world application of each concept. For homework, assign a worksheet that combines Nernst calculations with a short essay on the environmental benefits of fuel cells.
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