| Lesson Plan |
| Grade: |
Date: 25/02/2026 |
| Subject: Chemistry |
| Lesson Topic: Reaction kinetics: rate of reaction, effect of concentration, temperature, catalysts, rate equations, order of reaction |
Learning Objective/s:
- Describe the concept of reaction rate and express it mathematically.
- Explain how concentration, temperature, and catalysts influence reaction rates.
- Apply rate‑law equations to determine reaction order from experimental data.
- Use the Arrhenius equation to relate temperature to the rate constant and calculate activation energy.
- Interpret integrated rate‑law graphs to identify zero, first, and second order reactions.
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Materials Needed:
- Projector or interactive whiteboard
- PowerPoint/slide deck on reaction kinetics
- Handout with rate‑law tables and sample calculations
- Whiteboard and coloured markers
- Data sheets for a simple initial‑rates experiment (e.g., iodine‑clock)
- Calculator or computer with spreadsheet software
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Introduction:
Begin with a quick demonstration: drop an effervescent tablet into water and ask students to predict how quickly bubbles appear. Connect this to prior learning about collision theory and remind them that reaction rate depends on the frequency of effective collisions. Explain that by the end of the lesson they will be able to describe the factors that affect rates, write rate laws, and interpret kinetic graphs.
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Lesson Structure:
- Do‑now (5') – short question on collision frequency and definition of reaction rate.
- Mini‑lecture (15') – introduce rate definition, rate‑law equation, effect of concentration; include a worked example.
- Interactive demonstration (10') – show temperature effect with a colour‑change reaction; discuss the Arrhenius equation.
- Guided practice (15') – pairs analyse an initial‑rates data set to determine reaction order; teacher circulates.
- Catalyst discussion (10') – explain how catalysts lower activation energy; display energy‑profile diagram.
- Graph analysis activity (10') – students plot simulated data for zero, first, and second order reactions and identify the correct straight‑line form.
- Quick check (5') – exit ticket: one sentence on temperature’s effect on k and one example of a rate law.
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Conclusion:
Summarise that reaction rates are governed by concentration, temperature and catalysts, and that rate laws and integrated equations enable quantitative predictions. Collect the exit tickets to check understanding of the Arrhenius relationship. For homework, assign a worksheet where students calculate half‑lives and construct an Arrhenius plot from given k values.
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