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Year 7 Science — Materials around us

Group materials by whether you can see through them, whether they dissolve in water, and whether they shine — and say what makes something matter.

Name: ________________________

  1. 1.A freshly cut piece of iron shines, but an older piece looks dull. What does the chapter give as the reason?

    • a) Iron is non-lustrous once it has been cut
    • b) The older piece has stopped being a metal
    • c) The older piece was not iron to begin with
    • d) Air and moisture have acted on the older surface

  2. 2.Match each word to what it describes.

    • Transparent
    • Translucent
    • Opaque
    • you cannot see through it
    • you can see through it, but not clearly
    • you can see through it clearly

  3. 3.Any substance used to make an object is called a ___. Which word fills the gap?

  4. 4.A plastic spoon has been coated so that it gleams like silver. Is it a metal?

    • a) Yes, because lustrous materials are metals
    • b) Yes, because plastic becomes metal when it is coated
    • c) Not necessarily — a surface can be made shiny by polishing or coating
    • d) No material other than a metal can ever shine

  5. 5.Sort each material by how much you can see through it.

    Groups: Transparent · Translucent · Opaque

    • Air
    • Window glass
    • Wood
    • Butter paper
    • Cardboard
    • Frosted glass

  6. 6.Each of these is stirred into a tumbler of water. Sort them by what happens.

    Groups: Soluble in water · Insoluble in water

    • Chalk powder
    • Sugar
    • Salt
    • Sand
    • Sawdust

  7. 7.Fish live in water and need oxygen. What does the chapter say makes that possible?

    • a) Oxygen gas dissolves in water
    • b) Plants hand oxygen straight to the fish
    • c) Water is made of oxygen, so fish drink it
    • d) Fish come to the surface to breathe air

  8. 8.Tap the pane you could read a word through clearly.

    Write the number of the part.

    123

Answer key — Year 7 Science — Materials around us

  1. 1. d) Air and moisture have acted on the older surface
  2. 2. Transparent → you can see through it clearly; Translucent → you can see through it, but not clearly; Opaque → you cannot see through it
  3. 3. material
  4. 4. c) Not necessarily — a surface can be made shiny by polishing or coating
  5. 5. Window glass → Transparent; Air → Transparent; Frosted glass → Translucent; Butter paper → Translucent; Wood → Opaque; Cardboard → Opaque
  6. 6. Sugar → Soluble in water; Salt → Soluble in water; Chalk powder → Insoluble in water; Sand → Insoluble in water; Sawdust → Insoluble in water
  7. 7. a) Oxygen gas dissolves in water
  8. 8. 1 — Window glass