Chemical equilibria -2

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  • Created by: Shannon
  • Created on: 02-05-14 15:28
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  • Chemical equilibria
    • Chemical equilibria are dynamic
      • Both the forward and backward reactions are occurring at the same rate
      • The ratio of reactants:products does not change
      • In order for a dynamic equilibrium to be established, the reaction must take place in a closed system
    • Le Chatelier's principle
      • If a system at equilibrium is disturbed, the system's equilibrium will shift to oppose the effects of the change
    • Changes to equilibrium
      • Pressure
        • Increase
          • The equilibrium will shift to the side with the fewest particles
        • Decrease
          • The equilibrium will shift to the side with the most particles
      • Temperature
        • "heat favours the endothermic direction"
        • Increase
          • Increasing the temperature means adding more heat
            • Equilibrium shifts in the endothermic direction to absorb heat
        • Decrease
          • Decreasing the temperature means removing heat
            • Equilibrium shifts in the exothermic direction to replace the heat
      • Concentration
        • Increase
          • Equilibrium will shift to get rid of the extra reactant/product
        • Decrease
          • Equilibrium will shift to create more of the reactant/product
      • Catalysts do not affect the position of equilibrium

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