M3- Equilibrium
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D
B
If a reversible reaction is shown as: aA + bB –> cC + dD What is the Kc expression?
Kc = [C]c x [D]d / [A]a x [B]b
What is Le Chatelier’s principle?
When a system in dynamic equilibrium is subjected to change, the equilibrium position will shift to minimise the change (1)
B
B
When does the value of Kc change?
If the temperature changes
C
B
D
Write a Kc expression for this reaction: H2 + I2 ⇋ 2HI
Kc = [HI]2 / [H2] [I2]
D
What is the effect of a catalyst on equilibrium?
Does not change the position Speeds up the rates of forward and reverse reactions equally
C
What are key features of a reaction in ‘dynamic equilibrium’?
Exists in a closed system (1) when the rate of the forward reaction is equal to the rate of the reverse reaction (1) and the concentrations of reactants and products do not change (1)
A