📘 Class 8 Science – Chapter 4
Materials: Metals and Non-Metals

📝 Worksheet (Practice Questions)

Part A: Very Short Answer

1. Name one metal used for making electric wires.
2. Which metal is liquid at room temperature?
3. Name one non-metal used in fertilizers.
4. Which gas is released when metals react with acids?
5. What is the black substance formed on silver?

Part B: Short Answer

1. Write two properties of metals.
2. Why are metals malleable?
3. Write two uses of non-metals.
4. What is corrosion?
5. Why copper is used for making electric wires?

Part C: Long Answer

1. Explain rusting of iron.
2. Write differences between metals and non-metals.
3. Explain methods to prevent rusting.

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✅ FULL ANSWERS (Step-by-Step)

Answers – Part A

1. Copper
2. Mercury
3. Nitrogen
4. Hydrogen gas
5. Silver sulphide

Answers – Part B

1. Two properties of metals:
   • They are good conductors of heat and electricity.
   • They are malleable and ductile.
2. Metals are malleable because metal atoms can slide over each other without breaking.
3. Uses of non-metals:
   • Oxygen is used for breathing.
   • Nitrogen is used in fertilizers.
4. Corrosion is the slow destruction of metals by air, water or chemicals.
5. Copper is used for electric wires because it is a good conductor of electricity and ductile.

Answers – Part C

1. Rusting of Iron:
   Rusting is the process in which iron reacts with oxygen and water to form reddish-brown rust (iron oxide).
   Conditions required: Air and water.
2. Differences between Metals and Non-Metals:
   • Metals are shiny; non-metals are dull.
   • Metals conduct electricity; non-metals do not.
   • Metals are malleable; non-metals are brittle.
3. Methods to Prevent Rusting:
   • Painting
   • Galvanisation
   • Oiling and greasing

CBSE • NCERT • Class 8 Science – Worksheet with Answers