Lesson Plan

• Describe the difference between saturated and unsaturated organic compounds.
• Identify double and triple carbon‑carbon bonds in molecular formulas.
• Explain why unsaturation increases chemical reactivity.
• Classify common functional groups that contain unsaturation.
• Apply the concept of degree of unsaturation to simple hydrocarbons.

• Projector and screen
• Whiteboard and markers
• Printed handouts with definitions, tables, and diagrams
• Molecular model kits (ball‑and‑stick)
• Worksheet with practice problems
• Sample diagrams (e.g., butane vs. but‑2‑ene)
• Kahoot/quiz cards for quick checks

Begin with a quick demonstration showing the difference between a liquid oil (unsaturated) and a solid wax (saturated) to spark curiosity. Ask students what they already know about hydrocarbons and bond types. Outline that by the end of the lesson they will be able to state the definition of an unsaturated compound and recognise its key features.

1. Do‑now (5') – Students write the general formula for alkanes on a sticky note and display it.
2. Mini‑lecture (10') – Define saturated vs. unsaturated compounds, show the diagram of a single vs. double bond, and discuss reactivity.
3. Guided practice (12') – In pairs, use model kits to build propane, propene, and propyne; label the type of each C–C bond.
4. Interactive quiz (8') – Kahoot/flashcards on functional groups that contain unsaturation (alkene, alkyne, aromatic, carbonyl, nitrile).
5. Consolidation activity (10') – Calculate the degree of unsaturation for given molecular formulas on the worksheet.
6. Check for understanding (5') – Exit ticket: “Write a concise definition of an unsaturated compound and give one example.”

Summarise that unsaturated compounds contain double or triple carbon‑carbon bonds, which make them more reactive and give rise to characteristic reactions. Collect exit tickets to gauge understanding, and assign homework to complete the worksheet and find a real‑world product that relies on unsaturation (e.g., plastic, oil).