Haber Process and Conditions

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  • Created by: Lizzi
  • Created on: 19-05-13 08:41
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  • Haber method & CONDITIONS
    • Chemical Equilibrium
      • In a reversible reaction, the products can then be used to make the reactants
      • Reached when forward and reverse rates are equal
      • Changing conditions can alter the amounts of both the products and the reactants
    • Altering Conditions
      • Changing pressure:
        • Increase will favour the side with the least number of molecules
        • Decrease will favour the side with the most molecules
      • Changing temp.:
        • Increase favours the endothermic reaction (takes in heat/ energy)
        • Decrease favours the exothermic side (gives out heat/ energy)
    • Haber Process
      • Makes ammonia (used to make fertilisers and other chems.)
      • Ammonia is made from hydrogen and nitrogen
      • Conditions are chosen to give a quick, reasonable ammonia yield
      • Any unreacted N and H are recycled
    • Conditions/ Econimics
      • Uses about 200 atmospheres of pressure
      • Higher pressure would produce more ammonia, but it's too expensive
      • Temp. of about 450 degrees C is used
      • Lower temp. would produce more ammonia, but takes too long

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