Why is iron rarely used as pure iron?
  • It is too heavy
  • It is too expensive
  • It is too hard
  • It is too brittle
Which two of the following statements could explain why aluminum is preferred to iron for making cans for drinks?
  • Aluminum is a better conductor than iron
  • Aluminum is not as strong as iron
  • Aluminum has a lower melting point than iron
  • Aluminum corrodes less easily than iron
Why is potassium kept stored in oil?
  • It would react with the water in the air
  • To keep it shiny
  • To keep it lubricated
  • To see if it floats
Which metal is the most appropriate to make jewelry from?
  • Mercury
  • Aluminium
  • Gold
  • Potassium
Which metal would be the most appropriate to make overhead power lines from?
  • Mercury
  • Aluminium
  • Gold
  • Potassium
Aluminum is a useful metal to use because it does not corrode easily in air. Why?
  • It is very unreactive
  • It has a protective layer of aluminum oxide on its surface which does not allow air or water to penetrate
  • It doesn't react with anything
  • It is very reactive
Why is gold used for jewelry?
  • It's expensive
  • It looks nice
  • It is unreactive
  • It's very hard
Copper is often used for water pipes and electrical wires. Pick two properties of copper which make it useful for this purpose.
  • Good conductor and malleable
  • Poor conductor and ductile
  • Nice color and bendy
  • Shiny and thin
Why is iron better than aluminum for making bridges?
  • It is more easily painted
  • It is a better insulator
  • It has a higher density
  • It is harder
Why is aluminum used to make airplane bodies?
  • It is shiny
  • It is very light
  • It is cheap
  • It is very abundant
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