Chemistry - Equilibria 0.0 / 5 ? ChemistryEquilibriaA2/A-levelAQA Created by: Sneha_MariaCreated on: 05-03-20 22:28 Dynamic equilibrium This is when the forward and backward rate of reaction is the same and remains at a constant rate. Concentration of products and reactant are constant and appears not to change Only occurs in closed system where nothing can get in or out to influence the reactions 1 of 6 Le Chatelier's Principle The position of equilibrium will shift to oppose any change placed on it e.g temp, conc, pressure act. 2 of 6 Temperature An increase in temp favours endothermic reaction (+ve energy change), will increase yield of endothermic product Equilibrium shifts to reactants Increase in temperature is endothermic and equilibrium will be endothermic to oppose change 3 of 6 Pressure Equilibrium shifts to side with fewer moles as increasing pressure increases the moles Increasing pressure: Cost more Harder to store Risk of explosions Maintain building 4 of 6 Catalyst Increases the rate Equilibrium position does not change as it changes forward and backward reaction equally 5 of 6 Kc Ratio of conc of products and reactants Used to predict if reaction endothermic or endothermic Only changes with temperature Compares conc of reactants and products at equilibrium data a specific temperature 6 of 6
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