Chemistry 0620 · IGCSE · Reversible reactions and equilibrium

Reversible reactions and equilibrium — practice question

Methanol, CH$_3$OH, is made by reacting hydrogen with carbon monoxide. An equilibrium mixture results. $2\text{H}_2(g) + \text{CO}(g) \rightleftharpoons \text{CH}_3\text{OH}(g)$
(a)[2]

State what happens to the concentration of CH$_3$OH when the reaction has reached equilibrium. Explain your answer in terms of the rates of the forward and reverse reactions.

(b(i))[2]

State two disadvantages of using a pressure below 75 atmospheres.

(b(ii))[2]

Complete Table 5.1 using only the words increases, decreases, or no change.

(b(iii))[1]

State what can be inferred about the forward reaction.

(b(iv))[2]

Suggest which element from the list would be a suitable catalyst for the reaction, and give a reason for your choice.

(c(i))[2]

State two features shared by every member of a homologous series.

(c(ii))[1]

State the molecular formula of an alcohol with five carbon atoms.

(d(i))[2]

Draw the displayed formula of an ester containing three carbon atoms.

(d(ii))[2]

Name the alcohol and the carboxylic acid that combine to make butyl ethanoate.

(e)[2]

Calculate the empirical formula of the compound.

Worked solution & mark scheme

This 18-mark question has a full step-by-step worked solution and mark scheme. One marking point: the concentration does not change

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