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6. The extraction of a metal from its ore is ...

  • reduction
  • oxidation
  • impossible

7. Where are most ores found

  • In the crust of the Earth
  • In the core of the Earth
  • On Mars
  • Near rowing boats

8. What is corrosion?

  • Absorption of Carbon dioxide in Sea water
  • The oxidation of metals
  • Dissolving substances in acid

9. What is oxidation?

  • The decomposition of a carbonate
  • The gain of oxygen
  • The loss of oxygen
  • The decomposition of ionic compounds

10. What is reduction?

  • The loss of oxygen
  • The gain of oxygen
  • The decomposition of a carbonate
  • The decomposition of ionic compounds