Chemical Equilibria

Question 1

Le Chatelier’s principle refers to dynamic equilibrium. State what is meant by ‘dynamic’

Answer 1

Both forward and reverse reactions take place

Question 2

Le Chatelier’s principle refers to dynamic equilibrium. State what is meant by ‘equilibrium’

Answer 2

Reactions take place at equal rates

The concentration of all reactants and products remain constant

Question 3

What is Le Chatelier’s principle?

Answer 3

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.

Question 4

How catalysts affect equilibrium?

Answer 4

They have no effect on the position, but do affect the time it takes for equilibrium to be reached

Question 5

State what is meant by Kc

Answer 5

Kc is a value calculated from the equilibrium concentrations for a system at constant temperature

Question 6

Give the general formula for Kc for reaction wA +xB == yC + zD

Answer 6

Kc = ([C]^Y x [D]^Z)/([A]^W x [B]^X)