Lesson Plan

• Describe the halogen group and its reactivity trend.
• Explain the general halogen displacement reaction mechanism.
• Predict the products of specific halogen‑halide reactions.
• Analyse factors that influence the rate of displacement reactions.
• Apply the concepts to design a simple laboratory test for halogen identification.

• Projector and screen
• Whiteboard and markers
• Textbook/handout on halogen reactivity
• Worksheet for guided practice
• Chlorine water, potassium bromide solution, test tubes, beakers
• Safety goggles and lab aprons
• Colour chart for halogen observations

Begin with a striking image of coloured bromine vapour to capture interest. Review the periodic table group VII elements and their known reactivity trends. State that by the end of the lesson students will be able to describe and predict halogen displacement reactions and recognise visual cues in the lab.

1. Do‑Now (5') – short quiz on halogen symbols and diatomic nature.
2. Mini‑lecture (10') – reactivity series, general reaction equation, and oxidation‑reduction rationale.
3. Demonstration (15') – add chlorine water to potassium bromide solution; observe colour change and discuss the reaction.
4. Guided practice (10') – worksheet where students balance equations for several displacement reactions.
5. Think‑Pair‑Share (5') – predict outcomes when fluorine is added to chloride and bromide solutions.
6. Check for understanding (5') – exit ticket: write the balanced equation for one halogen displacement of your choice.

Recap the key idea that a more reactive halogen displaces a less reactive halide, highlighting the visual colour changes as evidence. Collect exit tickets to gauge mastery and assign homework: complete a set of reaction predictions for unseen halogen pairs.