Equilibria

Question 1

Define a dynamic equilibrium.

Answer 1

An reversible reaction in a closed system where both the forward and reverse reaction have the same rate. The concentration of reactants and products remains the same

Question 2

What effect does a catalyst have on the equilibrium position?

Answer 2

No effect on equilibrium position. Both Forward and reverse reaction rate increased equally

Question 3

How would a temperature increase affect a reversible reaction where the forward reaction is exothermic?

Answer 3

A shift in equilibrium towards the reactants LHS as it reduces the temperature

Question 4

What is the expression of Kc for this reaction? A + 2B ⇌ 2C+ D

Answer 4

kc =[A][B]²/[C]²[D]

Question 5

What are the units for Kc for this reaction? A + 2B ⇌ 2C+ D

Answer 5

no units

Question 6

What are the units for Kc for this reaction? A + 2B ⇌ 2C

Answer 6

mol dm⁻³

Question 7

Kc for a reaction is 0.01 mol dm⁻³. To what side does the equilibrium lie for this reaction?

Answer 7

Towards the LHS more reactants than products in the equilibrium mixture

Question 8

Kc for a reaction is 3.23 mol dm⁻³. To what side does the equilibrium lie for this reaction?

Answer 8

Towards the RHS more products than reactants in the equilibrium mixture