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Class 7 Science — Metals and non-metals

Tell metals from non-metals by malleability, ductility, sonority and conduction, say what rusting and corrosion need, and give the nature of a metal oxide and a non-metal oxide.

Name: ________________________

  1. 1.Heat passing from one point of a spoon along to another point has a one-word name in this chapter. What is it?

  2. 2.An iron gate left out through a wet season grows a brown flaky deposit. What is that deposit called?

  3. 3.A hammer is brought down on a lump of coal and it shatters. What is the word for behaving that way?

    • a) Malleable
    • b) Sonorous
    • c) Brittle
    • d) Ductile

  4. 4.Match each non-metal to the everyday job the chapter gives it.

    • Nitrogen
    • Chlorine
    • Iodine
    • goes into making fertilisers
    • put on a wound as an antiseptic
    • used to purify water

  5. 5.Match each property to what a material showing it can do.

    • Malleability
    • Ductility
    • Sonority
    • can be beaten into thin sheets
    • gives a ringing sound when struck
    • can be drawn into wires

  6. 6.Why does the chapter say that wood, glass and plastic are neither metals nor non-metals?

    • a) Because they float in water, and metals and non-metals sink
    • b) Because those two names are for elements, and these materials are not elements
    • c) Because they are neither hard nor soft enough to be tested
    • d) Because they are made in factories rather than dug out of the ground

  7. 7.Copper going green and silver going black are the same kind of slow damage that a brown deposit does to iron. What is the general name for a metal surface being eaten away like this by air, water or other substances?

  8. 8.Sort each of these elements into its family.

    Groups: Metal · Non-metal

    • Oxygen
    • Carbon
    • Aluminium
    • Sulfur
    • Magnesium
    • Copper
    • Iron
    • Nitrogen

Answer key — Class 7 Science — Metals and non-metals

  1. 1. conduction
  2. 2. rust
  3. 3. c) Brittle
  4. 4. Nitrogen → goes into making fertilisers; Chlorine → used to purify water; Iodine → put on a wound as an antiseptic
  5. 5. Malleability → can be beaten into thin sheets; Ductility → can be drawn into wires; Sonority → gives a ringing sound when struck
  6. 6. b) Because those two names are for elements, and these materials are not elements
  7. 7. corrosion
  8. 8. Copper → Metal; Aluminium → Metal; Iron → Metal; Magnesium → Metal; Sulfur → Non-metal; Carbon → Non-metal; Oxygen → Non-metal; Nitrogen → Non-metal