| Lesson Plan |
| Grade: |
Date: 25/02/2026 |
| Subject: Chemistry |
| Lesson Topic: Describe and explain 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, includi |
Learning Objective/s:
- Describe how concentration, pressure, surface area, temperature, and catalysts influence reaction rates.
- Explain the role of collision frequency and activation energy in these effects using collision theory.
- Apply the rate law and Arrhenius equation to predict changes in rate caused by concentration and temperature.
- Analyse real‑world examples (e.g., grinding solids, using enzymes) to illustrate each factor.
|
Materials Needed:
- Projector and screen
- Whiteboard and markers
- Student worksheets with summary table
- Sample chemicals for demos (powdered solid, solution)
- Thermometer and gas syringe (optional pressure demo)
- Catalyst sample (e.g., yeast) for enzyme illustration
- Calculators or tablets for rate calculations
|
Introduction:
Begin with a quick demonstration: drop a tablet into water and ask why it dissol faster when crushed. Recall the basics of collision theory and state that today students will investigate five factors that modify reaction rates. Success criteria: students will describe each factor’s impact and justify it using collision theory.
|
Lesson Structure:
- Do‑now (5'): short question on collision frequency to activate prior knowledge.
- Mini‑lecture (10'): review collision theory and introduce the five factors with diagrams.
- Guided inquiry stations (20'): groups rotate through stations exploring concentration, pressure, surface area, temperature, and catalyst using simple demos and data sheets.
- Whole‑class debrief (10'): each group shares findings; teacher links observations to theory.
- Practice problems (10'): worksheet calculations on rate law and the Arrhenius equation.
- Check for understanding (5'): exit ticket – one sentence describing how a chosen factor affects rate.
|
Conclusion:
Summarise that increasing concentration, pressure, surface area, temperature, or adding a catalyst all raise the reaction rate, each via distinct mechanisms. Students complete an exit ticket and receive a homework task to create a real‑life example for each factor. Reinforce that understanding these factors helps predict and control chemical processes.
|