Question 5
Describe a simple experiment to prove that – a copper wire conducts electricity, but a piece of coal does not.
Experiment to prove that a copper wire conducts electricity.
Procedure — Join a wire with the battery, copper and bulb
Observation — The bulb glows when current passes through the circuit.
Conclusion — Copper conducts electricity, hence it is a good conductor of electricity.
Experiment to prove that coal does not conduct electricity.
Procedure — Join a wire with battery, coal and bulb
Observation — The bulb does not glow.
Conclusion — Coal does not conduct electricity hence, it is a bad conductor of electricity.
ICSE Class VII Chemistry Chapter 5 14 Marks
Metals and Non-Metals — Quick Study Guide
Elements are broadly classified as metals, non-metals, or metalloids based on their physical and chemical properties.
Key Properties
- Metals: Lustrous, malleable, ductile, sonorous, good conductors, high density
- Non-metals: Dull, brittle, poor conductors, non-sonorous, low density
- Metalloids: Properties of both (e.g., Silicon, Germanium)
Chemical Reactions
- Metal + O2 → Basic oxide (turns red litmus blue)
- Non-metal + O2 → Acidic oxide (turns blue litmus red)
- Metal + Acid → Salt + H2
Exam Tips
- Know all exceptions: Mercury (liquid), Graphite (conducts), Diamond (lustrous), Na/K (soft)
- Learn the comparison table (8 properties) thoroughly
- Practice writing equations for metal reactions
- Know uses of at least 5 metals and 5 non-metals
Bright Tutorials | ICSE Class VII Chemistry | Chapter 5: Metals and Non-Metals | Contact: 9403781999