A2 AQA CHEM4 3.4.2

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  • Created by: Nuha
  • Created on: 23-04-14 12:41

3.4.2 Equilibria

Equilibrium constant Kc for homogenous systems

·         Dynamic equilibriumà the concentration of products and reactants remains constant and the forward rate of reaction is equal to the backward rate of reaction

·         Le Chatalierà if the conditions of a reaction at equilibrium are changed, the position of the equilibrium will shift to minimise/oppose the effect of the change

·         Increase in pressure= shift to side with fewer moles

·         Increase in temperature= shift to endothermic side

·         Increase in concentration on one side= shift to the other side

·         Catalysts= change the forward rate of reaction by the same amount as the backward rate of reaction so the position of the equilibrium doesn’t change

Kc

·         Quantitative description of the position of equilibrium at a constant temperature

·         aA + bB <-->  cC + dD

o   Kc= [C]c[D]d / [A]a[B]b

o   So remember the products go on the top

o   The units of Kc

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