Lesson Plan

• Describe what a catalyst is and how it influences reaction rates.
• Explain how catalysts lower activation energy.
• Identify the key features of enzyme catalysis (specificity, reusability, optimal conditions).
• Compare catalysed and uncatalysed reactions using the hydrogen peroxide example.
• Predict the effect of temperature and pH on enzyme activity.

• Projector or interactive whiteboard
• PowerPoint slides with diagrams of activation energy
• Handout summarising catalyst properties
• Short video of a catalase reaction
• Hydrogen peroxide and catalase (optional demonstration)
• Worksheet with comparison tables and questions

Begin with a quick question: “What everyday substances speed up processes without being used up?” Connect this to prior knowledge of heating or mixing. Explain that today’s success criteria are to define a catalyst, describe how it works, and illustrate its role using enzymes.

1. Do‑now (5') – Students write brief examples of catalysts they know.
2. Mini‑lecture (10') – Definition of catalyst, activation energy concept, and key enzyme features with slide visuals.
3. Interactive simulation (8') – Online model showing how lowering activation energy speeds up a reaction.
4. Demonstration (7') – Catalase breaks down hydrogen peroxide; observe rapid gas release and discuss unchanged enzyme.
5. Guided practice (10') – Complete worksheet comparing uncatalysed vs. catalysed reactions and answering short questions.
6. Check for understanding (5') – Exit‑ticket: “State one way a catalyst affects a chemical reaction.”

Recap the definition of a catalyst, its effect on activation energy, and the enzyme example. Collect exit‑tickets to gauge understanding and assign a brief homework: research another biological catalyst and summarise its role.