Lesson Plan

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Lesson Plan
Grade: Date: 17/01/2026
Subject: Chemistry
Lesson Topic: Describe how the properties of plastics have implications for their disposal
Learning Objective/s:
  • Describe how key physical and chemical properties of common plastics influence their suitability for different disposal methods.
  • Explain the environmental implications of each disposal option (mechanical recycling, chemical recycling, incineration, landfilling, biodegradation).
  • Evaluate the advantages and limitations of disposal methods based on plastic properties and additive content.
  • Compare the sustainability of conventional plastics versus biodegradable alternatives in waste management.
Materials Needed:
  • Projector and screen
  • PowerPoint slides with property tables
  • Handouts of the plastic property and disposal tables
  • Sample plastic items (e.g., PET bottle, PE bag, PVC pipe)
  • Worksheet for group activity
  • Whiteboard and markers
 Introduction:
Begin with a short video showing plastic waste in oceans to capture interest. Ask students what they know about why some plastics are recycled while others end up in landfill. Explain that today they will explore how a plastic’s density, melting point and chemical resistance determine its disposal route, and they will be able to match properties to appropriate waste‑management options by the end of the lesson.
Lesson Structure:
  1. Do‑now (5') – quick quiz on common plastic types and their everyday uses.
  2. Mini‑lecture (10') – review key properties (density, melting point, chemical resistance, additives) using slides and the provided tables.
  3. Group activity (15') – each group receives plastic samples/handouts and decides the most suitable disposal method, justifying with the properties; record decisions on a worksheet.
  4. Whole‑class discussion (10') – groups share their matches; teacher highlights correct links and discusses environmental impacts.
  5. Demonstration (5') – short video contrasting mechanical recycling with incineration.
  6. Check for understanding (5') – exit ticket: write one property that makes a plastic difficult to biodegrade and the disposal method best suited for it.
Conclusion:
Summarise that a plastic’s physical and chemical characteristics dictate which waste‑management pathway is viable, reinforcing the link between property and environmental impact. Collect the exit tickets and address any common misconceptions. For homework, assign students to research a biodegradable polymer and prepare a brief note on its property profile and suitable disposal method.