Chemical Equilibria
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Le Chatelier’s principle refers to dynamic equilibrium. State what is meant by ‘dynamic’
Both forward and reverse reactions take place
Le Chatelier’s principle refers to dynamic equilibrium. State what is meant by ‘equilibrium’
Reactions take place at equal rates The concentration of all reactants and products remain constant
What is Le Chatelier’s principle?
If a system is disturbed, the position of the equilibrium moves in the direction to oppose the change It can be used to predict the effects of changes in temperature, pressure and concentration on the position of equilibrium in homogeneous reactions.
How catalysts affect equilibrium?
They have no effect on the position, but do affect the time it takes for equilibrium to be reached
State what is meant by Kc
Kc is a value calculated from the equilibrium concentrations for a system at constant temperature
Give the general formula for Kc for reaction wA +xB == yC + zD
Kc = ([C]^Y x [D]^Z)/([A]^W x [B]^X)