| Lesson Plan |
| Grade: |
Date: 25/02/2026 |
| Subject: Chemistry |
| Lesson Topic: Explain in terms of structure and bonding the properties of metals: (a) good electrical conductivity (b) malleability and ductility |
Learning Objective/s:
- Describe the metallic lattice and the delocalised “sea of electrons”.
- Explain how the presence of free electrons gives metals high electrical conductivity.
- Explain why the non‑directional nature of metallic bonds allows metals to be malleable and ductile.
- Apply the concepts to predict how a metal will behave when a force is applied or an electric field is present.
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Materials Needed:
- Projector and screen
- PowerPoint/Google Slides with lattice diagram
- Conductivity demo kit (metal wire, LED, battery)
- Handout worksheet with concept‑map template
- Ball‑and‑stick model of a metal lattice (optional)
- Exit‑ticket slips or digital quiz
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Introduction:
Begin with a quick discussion of everyday metal objects (e.g., kitchen foil, copper wires) to spark interest. Ask students what they already know about why metals conduct electricity and can be hammered into sheets. State that by the end of the lesson they will be able to explain these properties using the ideas of metallic bonding and structure.
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Lesson Structure:
- Do‑Now (5') – Write down two properties of metals they observe in daily life and predict the underlying reason.
- Mini‑lecture with diagram (10') – Introduce the regular lattice of metal cations and the delocalised electron sea; define metallic bonding.
- Demonstration (8') – Show a simple circuit using a metal wire and LED to illustrate free‑electron flow.
- Guided inquiry (12') – Using the slide on conductivity, students answer why electrons move freely; then discuss malleability using the “sliding cations” model.
- Group activity (10') – Students complete a concept‑map linking structure → electron sea → conductivity, malleability, ductility.
- Check for understanding (5') – Exit‑ticket: “In one sentence, explain how metallic bonding accounts for both conductivity and ductility.”
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Conclusion:
Recap the key idea that a sea of delocalised electrons gives metals their characteristic conductivity and flexibility. Collect exit tickets to gauge understanding and assign a brief homework: research one metal’s commercial use and explain which property (conductivity or ductility) is most important for that application.
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