AQA AS Chemistry Unit 2: Equilibrium
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- Created on: 01-05-13 23:41
Chemistry Unit 2: Equilibria
The Idea of Equilibrium
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Equilibrium mixture: The mixture formed when a reversible reaction proceeds in a closed container until no further change occurs. The backward and forward reactions are proceeding at the same rate
Setting up an Equilibrium
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Dynamic Equilibrium: Forward and Backward reactions are occurring at the same rate so the mixture composition doesn't change
Conditions
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Can only be reached in a closed system
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The final equilibrium position will be the same
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It is a dynamic process where the forwards and backwards reactions occur at the same time
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When the density, concentration, colour and pressure are the same equilibrium has been reached
Chemical Equilibria
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Equilibrium can be formed of any proportions of reactant and products
Proportions can change due to conditions like temperature, pressure and
concentration
Changing Conditions
The Equilibrium Mixture
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Changing the proportions of reactants to products is a way of being able to obtain a greater yield of product
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This is changing the position of equilibrium
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If the proportion of product is increased the equilibrium position shifts to the right
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If the proportion of reactants is increased the equilibrium position shifts to the left
Le Chatelier's Principle
If a system at equilibrium is disturbed, the equilibrium position moves to oppose it
Changing Concentrations
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If you increase the concentration of a reactant then the equilibrium position shifts to reduce this concentration
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The equilibrium position moves to the right increasing the yield of product
Temperature Increase
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Equilibrium…
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