What is Le Chatelier's Principle?

If you change the conditions of a reversible reaction at equilibrium, the system will try to counter that change in order to restore the equilibrium.

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Why is Le Chatelier's principle useful?

It allows you to predict the affect of any changes made to a system.

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According to Le Chatelier's principle, what happens if you decrease the temperature?

The position of equilibrium will shift towards the exothermic direction, to produce more heat (and counteract the decrease in temperature).

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According to Le Chatelier's principle, what happens if you increase the temperature?

The position of equilibrium will shift towards the endothermic direction in order to decrease the temperature (and counteract the increase in temperature).

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According to Le Chatelier's principle, what happens if you increase the pressure?

The equilibrium will shift to the side with fewer molecules (moles) of gas, to reduce the pressure (and counteract the increase in pressure).

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According to Le Chatelier's principle, what happens if you decrease the pressure?

The equilibrium will shift to the side with more molecules (moles) of gas, to increase the pressure (and counteract the decrease in pressure).

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According to Le Chatelier's principle, what happens if you increase the concentration of the reactants?

The equilibrium will shift to the right (products side), to reduce the reactant concentrations and restore equilibrium.

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According to Le Chatelier's principle, what happens if you decrease the concentration of the reactants?

The equilibrium will shift to the left (reactants side), to increase the reactant concentrations and restore equilibrium.

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According to Le Chatelier's principle, what happens if you add a catalyst?

A catalyst will have no effect on the position of equilibrium.

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