Chemistry 0620 · IGCSE · Rate of reaction

Rate of reaction — practice question

Solid nitrogen pentoxide, $\text{N}_2\text{O}_5$, breaks down to form nitrogen dioxide gas and oxygen gas.
(a)[1]

Finish the equation by inserting the missing state symbols: $2\text{N}_2\text{O}_5(s) \rightarrow 4\text{NO}_2(\ldots) + \text{O}_2(\ldots)$.

(b(i))[1]

In Fig. 6.1, place an X to indicate where the reaction rate is at its maximum.

(b(ii))[1]

Work out the mass of nitrogen pentoxide 12 minutes after the reaction begins.

(c(i))[2]

Describe how the rate of decomposition of nitrogen pentoxide changes when the pressure is lowered and when a catalyst is introduced into the reaction mixture.

(c(ii))[1]

Raising the concentration of nitrogen pentoxide increases the decomposition rate. Pick the correct concentration unit from the list: dm$^3$/g, g/dm, g/dm$^2$, g/dm$^3$.

(d(i))[1]

Select the pH that is acidic: pH1, pH7, pH8, pH14.

(d(ii))[1]

State one method for reducing nitrogen dioxide emissions from cars.

(e)[3]

Explain these results in terms of kinetic particle theory.

Worked solution & mark scheme

This 11-mark question has a full step-by-step worked solution and mark scheme. One marking point: 4NO₂(g) together with O₂(g)

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