Altering Conditions

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  • Created by: Kate H
  • Created on: 06-05-14 15:09

Changing Temperature

  • Reversible reactions are exothermic in one direction and endothermic in the other direction
  • Increasing the temperature favours the reaction in the endothermic reaction. The equilibrium shifts as if to lower the temperature by taking in energy
  • So decreasing the temperature favours the endothermic reaction
  • If the forward reaction is exothermic:
  • an increase in temperature decreases the amount of product formed
  • a decrease in temperature increases the amount of product formed
  • If the forward reaction is endothermic:
  • an increase in temperature will increase the amount of product formed
  • a decrease in temperature will decrease the amount of product forme
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Changing Pressure

If we change the conditions of a system at equilibrium, the posotion of equilibrium shifts to try and cancel out the change.

  • If the forward reaction produces more molecules of gas:
  • an increase in pressure decreases the amount of product formed
  • a decrease in pressure increases the amount of product formed
  • If the forward reaction produces fewer molecules of gas (like the Haber process):
  • an increase in pressure increases the amount of product formed
  • a decrease in pressure decreases the amount of product formed
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