Core Chemistry Topics 3&4

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1. Why do metals rust?

  • because the metal is being oxidised (gain of oxygen)
  • because it has been exposed to too much carbon dioxide
  • because the metal has lost oxygen (reduction)
  • because it has been exposed to too much water
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2. Which method would be used to extract iron from its metal ore?

  • heating with carbon
  • electrolysis

3. What is the test for chlorine?

  • bleaches damp litmus paper
  • relights a glowing splint
  • makes a squeaky pop with a lighted splint

4. What products will be made when reacting hydrchloric acid + sodium hydroxide?

  • sodium chloride
  • Sodium chloride + water
  • sodium chloride + water +carbon dioxide
  • sodium + hydrogen

5. What is produced after the electrolysis of salt?

  • carbon dioxide
  • hydrogen
  • chlorine
  • oxygen

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