Equilibrium

Cards made for GCSE OCR gateway science Chemistry on equilibrium

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  • Created by: Lucy :)
  • Created on: 31-05-13 11:21

Equilibrium

A reversible reaction is one where the products of the reaction can themselves react to produce the original reactants

  • has to take place in a 'closed system'
  • = forward reaction going at exactly the same rate as the backward one
  • doesn't mean the amounts of reactants + products are equal
  • NOTE Adding a catalyst speeds up the time taken to get to equilibrium
  • 3 Things can change the position of it:
    • Temperature
    • Pressure
    • Concentration
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Changing equilibrium

  • 3 Things can change the position of it:
    • Temperature
      • all reactions are exothermic in 1 direction + endothermic in the other
      • if you decrease the tmep the equilibrium will move to try + increase it = the equilibrium moves in the exothermic direction to produce more heat
    • Pressure
      • if you increase the pressure the equilibrium tries to reduce it
      • it moves in the direction where there are fewer moles of gas
    • Concentration
      • if you increase the concentration of the reactants the equilibrium tries to decrease it by shifting to the right
      • if you increase the concentration of the products the equilibrium tries to reduce it by shifting to the left
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