Describe how Le Châtelier's principle can be used to predict the effects of changing temperature on the position of equilibrium.

If the temperature is increased, the position of equilibium moves in the endothermic direction.

If the temperature is decreased, the position of equilibium moves in the exothermic direction.

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How does increasing the temperature affect the value of Kif the forward reaction is endothermic?

Kc increases

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What is the effect of changing concentration on the value of Kc?

The value of Kc remains unchanged by chages in concentration.


The value of Kc is only altered by changes in temperature.

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What can the size of the equilibrium constant, Kc, tell us about the composition of the equilibrium mixture?

If Kc is much greater than 1, products predominate.

If Kc is much less than 1, reactants predominate.

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What is the effect of a catalyst on the value of Kc and the position of equilibrium?

Catalysts have no effect on the value of Kc or the position of equilibrium.

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How do catalysts affect the rate at which equilibrium is attained?

Catalysts increase the rate at which equilibrium is attained.

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How does decreasing the temperature affect the value of Kif the forward reaction is endothermic?

Kc decreases

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How does decreasing the temperature affect the value of Kif the forward reaction is exothermic?

Kc increases

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How does increasing the temperature affect the value of Kif the forward reaction is exothermic?

Kc decreases

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