Chemistry 5070 · O Level · Reversible reactions and equilibrium

Reversible reactions and equilibrium — practice question

Methanol is made by letting carbon monoxide react with hydrogen. The forward reaction releases heat. $\text{CO(g)} + 2\text{H}_2\text{(g)} \rightleftharpoons \text{CH}_3\text{OH(g)} \qquad \Delta H = -91\,\text{kJ mol}^{-1}$
(a)[2]

Predict and explain the effect of increasing the pressure on the position of equilibrium. The temperature is kept constant.

(b)[2]

Predict and explain the effect of decreasing the temperature on the position of equilibrium. The pressure is kept constant.

(c)[2]

The rate of reaction decreases when the temperature is lowered. Explain why.

(d(i))[2]

The reaction is catalysed by copper. Describe and explain the effect of a catalyst on this reaction.

(d(ii))[2]

Copper is a transition element. Many transition elements are catalysts. Give two further properties of copper that show it is a transition element.

Worked solution & mark scheme

This 10-mark question has a full step-by-step worked solution and mark scheme. One marking point: equilibrium moves to the right / gives more products

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