Rate of reaction: past paper questions

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• Question 14May/June 2026, paper 12Multiple choice1 markHas a diagram

  An experiment X is carried out between a solid and a solution using the apparatus shown. The total volume of gas given off is measured at different times and the results plotted on a graph.

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• Question 14Oct/Nov 2025, paper 11Multiple choice1 mark

  Magnesium is reacted with dilute hydrochloric acid of the same concentration in four experiments using different conditions. Which reaction finished in the shortest time?

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• Question 14Oct/Nov 2024, paper 11Multiple choice1 mark

  Hydrogen peroxide decomposes to form water and oxygen. The equation is shown. $$2{\text{H}}_2{\text{O}}_2(\text{l})\to 2{\text{H}}_2\text{O}(\text{l})+{\text{O}}_2(\text{g})$$ Manganese(IV) oxide catalyses this reaction.

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• Question 13Oct/Nov 2023, paper 11Multiple choice1 markHas a diagram

  An experiment is carried out to find the rate of reaction between hydrochloric acid and zinc.

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• Question 17May/June 2026, paper 13Multiple choice1 markHas a diagram

  Dilute hydrochloric acid reacts with calcium carbonate. $1.0\text{ g}$ of calcium carbonate is added to $50{\text{ cm}}^3$ of dilute hydrochloric acid and the initial rate of reaction is calculated. The experiment is repeated but one change is made.

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• Question 16Oct/Nov 2025, paper 12Multiple choice1 mark

  Which items of apparatus are essential when measuring the effect of temperature on the rate of any reaction?

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• Question 15Oct/Nov 2024, paper 11Multiple choice1 mark

  Four students collect the gas produced from the reaction of calcium carbonate with dilute hydrochloric acid. Each student records the time taken to collect a volume of gas. Which results show the highest average rate of reaction?

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• Question 31Oct/Nov 2023, paper 11Multiple choice1 mark

  In which reaction is the rate of reaction increased by light?

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• Question 11May/June 2026, paper 21Multiple choice1 mark

  Calcium carbonate is reacted with an excess of dilute hydrochloric acid.

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• Question 16Oct/Nov 2025, paper 21Multiple choice1 markHas a diagram

  Hydrogen peroxide solution decomposes very slowly at room temperature to produce oxygen gas. This gas forms a rising foam when liquid detergent is added. Five test-tubes are half-filled with hydrogen peroxide solution.

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• Question 16Oct/Nov 2024, paper 12Multiple choice1 mark

  Which two pieces of apparatus are most useful to measure the rate of a reaction in which a gas is given off?

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• Question 36Oct/Nov 2023, paper 11Multiple choice1 markHas a diagram

  The apparatus used to investigate the rate at which hydrogen gas is given off when a piece of magnesium reacts with dilute hydrochloric acid is shown. Which additional piece of apparatus is needed to determine the rate of reaction?

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• Question 16May/June 2026, paper 21Multiple choice1 markHas a diagram

  The diagram shows the reaction pathway diagram for the reaction between $\text{X}$ and $\text{Y}$ to form product $\text{Z}$. The reaction happens more rapidly if a catalyst is used. How would the diagram change when a catalyst is used?

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• Question 16Oct/Nov 2025, paper 22Multiple choice1 mark

  Aqueous sodium thiosulfate, ${\text{Na}}_2{\text{S}}_2{\text{O}}_3$, reacts with dilute hydrochloric acid to form a yellow precipitate of sulfur.

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• Question 17Oct/Nov 2024, paper 12Multiple choice1 markHas a diagram

  Reaction 1 and reaction 2 both produce a gas. The total volume of gas produced in each reaction is measured every minute for 10 minutes. A graph of the results is shown.

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• Question 14Oct/Nov 2023, paper 12Multiple choice1 markHas a diagram

  Solid calcium carbonate reacts with dilute hydrochloric acid. Which changes to the reaction conditions increase the rate of reaction?

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• Question 38May/June 2026, paper 21Multiple choice1 markHas a diagram

  Magnesium reacts with dilute hydrochloric acid to produce hydrogen gas. Which pieces of apparatus are needed to determine the rate of this reaction?

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• Question 18Oct/Nov 2025, paper 23Multiple choice1 mark

  Zinc reacts with dilute hydrochloric acid. Which statement about the particles in the reaction is correct?

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• Question 15Oct/Nov 2023, paper 12Multiple choice1 markHas a diagram

  Zinc reacts slowly with dilute sulfuric acid at room temperature. Bubbles of a gas, L, form on the surface of the zinc. When a small amount of copper is added, the reaction is faster.

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• Question 15May/June 2026, paper 22Multiple choice1 mark

  Ethanol and ethanoic acid react to form ethyl ethanoate and water.

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• Question 24Oct/Nov 2025, paper 23Multiple choice1 markHas a diagram

  Dilute acid R and dilute acid S have the same concentration. The same volume of each dilute acid is reacted separately with the same mass of magnesium ribbon. Both reactions are carried out at room temperature and pressure.

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• Question 15Oct/Nov 2024, paper 22Multiple choice1 markHas a diagram

  Sulfur dioxide is converted to sulfur trioxide in the Contact process. The conditions used are $450{}^{\circ }\mathrm{C}$ and $200\mathrm{k}\mathrm{P}\mathrm{a}$ with a vanadium(V) oxide catalyst. Which row describes and explains the effect of changing conditions on the rate of reaction?

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• Question 16May/June 2026, paper 22Multiple choice1 mark

  Which statement explains why increasing the concentration of a reactant increases the rate of reaction?

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• Question 8Oct/Nov 2025, paper 31Structured5 marksHas a diagram

  A student investigates the reaction of small pieces of magnesium with excess dilute hydrochloric acid. $$\text{Mg}+2\text{HCl}\to {\text{MgCl}}_2+{\text{H}}_2$$ Fig. 8.1 shows the total volume of hydrogen gas, ${\text{H}}_2$, produced as the reaction proceeds.

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• Question 8Oct/Nov 2024, paper 31Structured8 marks

  A student investigates the reaction of small pieces of zinc with excess dilute sulfuric acid of three different concentrations. The time taken for each reaction to finish is recorded. The three concentrations of the acid are: ● 0.2 mol/dm${}^3$ ● 0.4 mol/dm${}^3$ ● 0.8 mol/dm${}^3$.

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• Question 19May/June 2026, paper 22Multiple choice1 markHas a diagram

  A known mass of magnesium is added to excess dilute hydrochloric acid. The total volume of hydrogen produced is $70{\text{ cm}}^3$. The experiment is repeated using dilute ethanoic acid in place of dilute hydrochloric acid.

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• Question 8Oct/Nov 2025, paper 32Structured5 marksHas a diagram

  Excess dilute hydrochloric acid is added to aqueous sodium sulfide to form aqueous sodium chloride and gaseous hydrogen sulfide, ${\text{H}}_2\text{S}$.

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• Question 8Oct/Nov 2024, paper 32Structured8 marks

  A student investigates the reaction of small pieces of calcium carbonate with excess dilute hydrochloric acid of three different concentrations. The time taken for each reaction to finish is recorded.

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• Question 14Oct/Nov 2023, paper 21Multiple choice1 markHas a diagram

  Hydrogen peroxide, ${\text{H}}_2{\text{O}}_2$, decomposes to form water and oxygen. $$2{\text{H}}_2{\text{O}}_2\text{(aq)}\to 2{\text{H}}_2\text{O(l)}+{\text{O}}_2\text{(g)}$$ Manganese(IV) oxide catalyses the decomposition reaction.

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• Question 18May/June 2026, paper 23Multiple choice1 mark

  Magnesium reacts with hydrochloric acid to form magnesium chloride and hydrogen. Why does magnesium powder react faster than magnesium ribbon?

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