Rate of reaction: past paper questions

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• Question 14Oct/Nov 2025, paper 12Multiple choice1 mark

  $20.0{\text{ cm}}^3$ of hydrogen peroxide decomposes to water and oxygen in the presence of a suitable catalyst. $160{\text{ cm}}^3$ of oxygen, measured at room conditions, is produced in $5.00\text{ minutes}$.

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• Question 14Oct/Nov 2024, paper 11Multiple choice1 markHas a diagram

  In acidic conditions, iodine reacts with propanone in a substitution reaction.

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• Question 14Oct/Nov 2023, paper 11Multiple choice1 markHas a diagram

  In reaction 1, a student measures the initial rate of production of ${\mathrm{C}\mathrm{O}}_2(\mathrm{g})$ when ${\mathrm{C}\mathrm{u}\mathrm{C}\mathrm{O}}_3(\mathrm{s})$ is added to $50{\text{ cm}}^3$ of $0.1{\text{ mol dm}}^{-3}{\mathrm{H}\mathrm{N}\mathrm{O}}_3(\mathrm{a}\mathrm{q})$.

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• Question 2May/June 2025, paper 11Multiple choice1 markHas a diagram

  The rate of the reaction between a reactive metal and an excess of a dilute acid is investigated. The total volume of hydrogen gas produced is recorded every 30 seconds for 3 minutes.

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• Question 15Oct/Nov 2024, paper 12Multiple choice1 mark

  Why does the rate of a gaseous reaction increase when the pressure is increased at a constant temperature?

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• Question 16Oct/Nov 2023, paper 12Multiple choice1 markHas a diagram

  The decomposition of hydrogen peroxide in the presence of ${\text{MnO}}_2$ produces water and oxygen gas.

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• Question 3May/June 2025, paper 11Multiple choice1 markHas a diagram

  In the diagram, curve X was obtained by measuring the volume of oxygen produced during the decomposition of $100{\text{ cm}}^3$ of $1.0\text{ mol}{\text{dm}}^{-3}$ hydrogen peroxide. A catalyst of manganese(IV) oxide was used.

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• Question 17Oct/Nov 2023, paper 12Multiple choice1 markHas a diagram

  The diagram shows a gas syringe with a free-moving piston. The syringe contains gaseous hydrogen, gaseous iodine and gaseous hydrogen iodide at equilibrium. $${\text{H}}_2(\text{g})+{\text{I}}_2(\text{g})\rightleftharpoons 2\text{HI}(\text{g})$$ Three changes are listed.

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• Question 9May/June 2025, paper 12Multiple choice1 mark

  Aqueous hydrogen peroxide, ${\mathrm{H}}_2{\mathrm{O}}_2$, decomposes into water and oxygen in the presence of a suitable catalyst. $50{\text{ cm}}^3$ of a $0.50{\text{ mol dm}}^{-3}$ solution of hydrogen peroxide produced $120{\text{ cm}}^3$ of oxygen in $2.0\text{ minutes}$.

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• Question 2May/June 2025, paper 13Multiple choice1 markHas a diagram

  Diagram 1 shows the reaction pathway for a reaction. Diagram 2 shows a graph of concentration of reactant against time for the same reaction. Which diagrams, drawn to the same scale, show the effect of increased temperature on this reaction?

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• Question 11May/June 2023, paper 11Multiple choice1 mark

  Iodine and propanone react according to the following equation. $${\mathrm{I}}_2(\mathrm{a}\mathrm{q})+\mathrm{C}{\mathrm{H}}_3\mathrm{C}\mathrm{O}\mathrm{C}{\mathrm{H}}_3(\mathrm{a}\mathrm{q})\to \mathrm{C}{\mathrm{H}}_3\mathrm{C}\mathrm{O}\mathrm{C}{\mathrm{H}}_2\mathrm{I}(\mathrm{a}\mathrm{q})+\mathrm{H}\mathrm{I}(\mathrm{a}\mathrm{q})$$ If the concentration of propanone is increased, keeping the total reaction volume constant, the initial rate of the reaction also increases.

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• Question 15May/June 2023, paper 12Multiple choice1 mark

  The equations for two reactions are shown. $$\text{reaction X}2\text{NOBr}\to 2\text{NO}+{\text{Br}}_2$$ $$\text{reaction Y}2\text{NOCl}\to 2\text{NO}+{\text{Cl}}_2$$ The two reactions have similar reaction mechanisms.

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• Question 18May/June 2023, paper 13Multiple choice1 markHas a diagram

  The rate of an exothermic reaction is followed by measuring the concentration of a reactant at regular time intervals. During the experiment the temperature of the reaction mixture is not controlled. Which graph shows the change in concentration of reactant against time?

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