Chemistry 5070 · O Level · Reversible reactions and equilibrium

Reversible reactions and equilibrium — practice question

When heated, ammonium chloride breaks down to form hydrogen chloride and ammonia. The reaction can proceed in both directions, and the forward change takes in thermal energy. $\text{NH}_4\text{Cl}(s) \rightleftharpoons \text{HCl}(g) + \text{NH}_3(g)$
(a(i))[2]

State what equilibrium means. Your answer should refer to the rate of reaction and to the concentrations of the reactants and products.

(a(ii))[2]

Predict what happens to the equilibrium position when the temperature is raised and the pressure stays the same. Explain your answer.

(a(iii))[2]

Predict what happens to the equilibrium position when the pressure is raised and the temperature stays the same. Explain your answer.

(b)[2]

Predict what happens to the rate of the backward reaction when the temperature is raised and the pressure stays the same. Explain your answer.

(c)[2]

Predict what happens to the rate of the backward reaction when the pressure is raised and the temperature stays the same. Explain your answer.

Worked solution & mark scheme

This 10-mark question has a full step-by-step worked solution and mark scheme. One marking point: “the forward reaction rate is equal to the backward reaction rate” …

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