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9 Cards in this Set

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Dynamic equilibrium

Rates of the forward and backward reaction are equal. Concentrations of reactants and products are constant.

Reversible reaction

Reaction that goes in both directions at the same temperature

Position of equilibrium

Ratio of product to reactant concentrations

Le Chateliers Principle

When conditions in a system at equilibrium are altered, position of equilibrium shifts to oppose the change

Temperature

Equilibrium shifts in endothermic direction


Decrease in equilibrium yield for exothermic reaction


Increase in equilibrium yield for endothermic reaction


Due to higher activation energies

Pressure



Only affects reactions with gases. Increase will shift to side with fewest gaseous moles.


Decrease will shift to side with most gaseous moles.

Concentration

Only applies to reactants that are dissolved in a solvent. If conc of a reactant increases, equilibrium will shift to remove that substance. If conc of a reactant decreases, equilibrium will shift to produce more of that species.

Catalyst

No effect on the position of equilibrium. Lowers the activation energy of the reaction, so the rate of attainment increases.

catalyst effect on exothermic reactions

High temperature results in low equilibrium yield that is reached quickly


Low temperature results in high equilibrium yield reached slowly


Catalysts allow reaction to be faster at lower temperatures