Le Chatelier Principle

Le Chatelier Principle

a change in one of the variables that describe a system at equilibrium produces a shift in the position of the equilibrium that counteracts the effect of the change

Change in concentration

shift to opposite side; ex: inc reactant = shift to make product, dec reactant = shift to make more reactant

Change in pressure only affects systems having ___ products and/or reactants

gaseous

Increase pressure will cause system to

shift to side w/ fewer gas particlesd

Decreasing pressure will

cause system to shift to side w/ more gas particles

(For pressure) what happens if both sides of the reactant have the same moles of gas

pressure does not affect equilibrium

Adding an inert gas affects equilibrium (T/F)

False ; the partial pressures of other gases are not changed. Total pressure increases but individual partial pressures do not change

If you increase temp. in an exothermic reaction

-H shifts left to reactants

If you increase temp. in an endothermic reaction

+H shifts right to products

If you decrease temp. in an endothermic reaction

H shifts left

If you decrease temp. in an exothermic reaction

H shifts right

What does adding a catalyst do

does not affect equilibrium; just makes it so equilibrium is reached faster

Removing a product

shifts to make more products

Increasing volume

shift to side w/ more mol (gases) or aq ions

Decreasing volume

Increases pressure = shift to side w/ fewer gas particle