Chemistry 0620 · IGCSE · Reversible reactions and equilibrium

Reversible reactions and equilibrium — practice question

Ethanoic acid is made by reacting methanol with carbon monoxide. This gives an equilibrium mixture. $\text{CH}_3\text{OH}(g) + \text{CO}(g) \rightleftharpoons \text{CH}_3\text{COOH}(g)$
(a)[2]

State two features of an equilibrium.

(b)[2]

Use this information to state why the process is not run below 300 ^{\circ}C or above 300 ^{\circ}C.

(c)[3]

Fill in the table using only increases, decreases or no change. It shows how the forward reaction rate and the equilibrium yield of $\text{CH}_3\text{COOH}(g)$ are affected when a catalyst is added and when the pressure is reduced.

(d)[2]

Suggest which of the metals below is a suitable catalyst for the reaction. Explain your choice. aluminium calcium cobalt magnesium potassium

(e)[1]

State the general formula for this homologous series.

(f)[2]

Draw the structure of the carboxylic acid with three carbon atoms. Include every atom and every bond.

(g(i))[1]

Name the ester X.

(g(ii))[2]

Give the names of the carboxylic acid and the alcohol that react together to form ester X.

(h)[3]

Calculate the empirical formula for ester Y.

(i)[1]

Determine the molecular formula for ester Z.

Worked solution & mark scheme

This 19-mark question has a full step-by-step worked solution and mark scheme. One marking point: forward reaction rate equals reverse reaction rate

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