Design an activity to show that metals are good conductors of heat and have high melting points.
Generated by claude-sonnet-4-6 · 2026-06-15 06:48 · grounding rag
Model Answer
Activity (Activity 3.5):
Materials required: Aluminium or copper wire, a stand, wax, a pin, spirit lamp/candle.
Procedure:
- Clamp an aluminium or copper wire on a stand.
- Fix a pin to the free end of the wire using wax.
- Heat the wire with a spirit lamp near the clamped end.
Observation: After some time, the wax melts and the pin falls. However, the metal wire does not melt.
Conclusion: Heat travels from the heated end to the free end, showing metals are good conductors of heat. The wire remaining intact (not melting) shows metals have high melting points.
Source: Chapter 3, Activity 3.5, Section 3.1.1
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Explanation
- Examiners expect: materials, procedure (steps), observation, and conclusion — all four components, even in 3 marks.
- The key two conclusions must both appear: (i) good conductor of heat, (ii) high melting point.
- The pin/wax trick is the standard NCERT method — describe it exactly.
- Don't write extra theory; keep it crisp and activity-focused.