Download and practise with this ZIMSEC A-Level Chemistry Paper 3 June 2024 question paper. Useful for exam revision, past paper practice, and preparation in Zimbabwe.
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This is the ZIMSEC A-Level Chemistry question paper for Paper 3 from June 2024. Use it for exam practice under timed conditions.
Section A
Answer any two questions from this section.
1 (a) The kinetics of the reaction shown were investigated.
\[
\mathrm{NO}_{2(p)}+\mathrm{CO}_{(p)} \rightarrow \mathrm{NO}_{(p)}+\mathrm{CO}_{2(p)}
\]
The results of the investigation are shown in Table 1.1.
\begin{table}
\captionsetup{labelformat=empty}
\caption{Table 1.1}
time $/ \mathrm{sec}$ | 0 | 20 | 50 | 75 | 150 | 300 | 400
{$\left[\mathrm{NO}_{2}\right]^{/} \times 10^{-1}$}
moldm ${ }^{-3}$
| 5.0 | 4.4 | 3.8 | 3.4 | 2.5 | 1.25 | 0.8
\end{table}
(i) Plot a graph of the results.
(ii) Deduce the
1. half-life for the reaction,
2. order of the reaction with respect to $\left[\mathrm{NO}_{2}\right]$.
(iii) Calculate the rate constant, $k$.
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