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2. Moles= ???

  • Mass/ Mr
  • Mass x atomic number
  • Mass x Mr
  • Mr/mass

3. Why is cryolite added in the extraction of aluminium?

  • It speeds up the reaciton
  • It looks pretty
  • It lowers the melting point
  • It raises the melting point

4. The two conditions/elements needed for rust are what?

  • Water and oxygen
  • Oxygen and copper
  • Oxygen and carbon dioxide
  • Water and carbon dioxide

5. What is the name of the ore in which aluminium is found?

  • Metal aluminium
  • Bauxite
  • Rock aluminium
  • Haematite
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