| Lesson Plan |
| Grade: |
Date: 25/02/2026 |
| Subject: Chemistry |
| Lesson Topic: Describe the effect on the rate of reaction of: (a) changing the concentration of solutions (b) changing the pressure of gases (c) changing the surface area of solids (d) changing the temperature (e) adding or removing a catalyst, including enzymes |
Learning Objective/s:
- Describe how concentration, pressure, surface area, temperature and catalysts influence reaction rates.
- Explain the collision‑theory and Arrhenius reasons behind each effect.
- Predict the direction and magnitude of rate changes in given scenarios.
- Apply rate laws and the Arrhenius equation to quantify temperature effects.
- Evaluate the role of catalysts and enzymes in speeding up reactions.
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Materials Needed:
- Projector and screen
- Whiteboard and markers
- Printed handouts with summary table
- Sample chemicals (e.g., powdered calcium carbonate, acid solution)
- Pressure syringe or sealed reaction‑vessel demonstration set
- Thermometer or heating plate
- Catalyst samples (e.g., copper wire, enzyme solution)
- Worksheet for scenario questions
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Introduction:
Begin with a short video clip showing a rapid colour change in a chemical reaction to spark curiosity. Ask students what they already know about why some reactions happen faster than others, linking to prior lessons on collision theory. State that by the end of the lesson they will be able to explain and predict how five key factors modify reaction rates.
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Lesson Structure:
- Do‑now quiz on collision theory (5’) – students answer on mini‑whiteboards.
- Mini‑lecture with slides covering each factor (15’) – concise explanations and real‑world examples.
- Guided demonstrations: (a) varying concentration of a coloured solution (5’) and (b) increasing pressure in a sealed gas tube (5’).
- Hands‑on activity: grind solid calcium carbonate vs. chunks and measure rate of reaction with acid (10’).
- Group analysis: temperature and catalyst case studies using the Arrhenius equation and enzyme diagram (10’).
- Check for understanding: exit‑ticket where each pupil writes one prediction for a new scenario (5’).
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Conclusion:
Recap the five factors and the underlying principles that cause rates to increase or decrease. Collect exit‑tickets and use a few responses to reinforce correct reasoning. Assign homework: complete a worksheet that asks students to predict rate changes for novel reactions and justify using the concepts learned.
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