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6. what are the raw materials used in the contact process?

  • sulfur, air
  • sulfur dioxide, water
  • sulfur, nitrogen

7. what is the equation for the production of ammonia

  • nitrogen + hydrogen ---- ammonia
  • nitric acid + hydrogen ---- ammonia
  • nitrogen + hydrochloric acid --- ammonia

8. what is the name of the catalyst used?

  • vanadium
  • iron
  • steel

9. at the cathode aluminium ions:

  • lose 3 electrons to form an aluminium atom
  • gain 3 electrons to form an aluminium atom
  • gain 2 electrons to form an aluminium atom

10. what happens in the reaction: calcium carbonate ---- calcium oxide + carbon dioxide

  • calcium carbonate loses electrons to become calcium oxide
  • calcium carbonate thermally decomposes to basic calcium oxide
  • calcium carbonate is displaced

11. how is hydrogen produced?

  • reaction of steam with natural gas
  • reaction of water and hydroxide
  • reaction of water with natural gas

12. a cathode is ...

  • the negative electrode
  • the positive electrode

13. identify a cost of the process

  • heating to 450°C
  • purchasing strong enough pipes to withstand pressure
  • increasing the pressure

14. an anode is ...

  • the positive electrode
  • the negative electrode

15. at the anode oxide ions:

  • lose 2 electrons to form an oxygen atom
  • gain 2 electrons to form an oxygen atom
  • lose 2 electrons to form an oxygen molecule

16. what is a major use of ammonia?

  • to make fertilisers
  • fertilisers

17. what are 3 uses of sulphuric acid

  • treatment of metal, in the hater process, dehydrating agent
  • neutralisation reactions, to make drugs / explosives, dehydrating agent
  • as a catalyst, to neutralise drugs, hydrating agent

18. what pressure is needed?

  • 200 atmospheres
  • 2 atmostpheres
  • 30 atmospheres

19. what would happen if the pressure was increased?

  • higher % yield
  • lower % yield
  • faster reaction

20. why is the reaction in the hater process called an 'equilibrium' ?

  • the rate of the forward reaction is equal to the rate of the backwards
  • forwards and backwards reactions are as fast as each other
  • forwards and backwards reaction produce same amount of substance each