Chemical reactions: past paper questions

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• Question 15May/June 2026, paper 11Multiple choice1 markHas a diagram

  Which row describes a chemical change?

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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 12Oct/Nov 2023, paper 11Multiple choice1 mark

  Which process involves a chemical change?

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• Question 17May/June 2026, paper 11Multiple choice1 mark

  Which statement about cobalt(II) chloride and copper(II) sulfate is correct?

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• Question 15Oct/Nov 2025, paper 11Multiple choice1 mark

  Blue hydrated copper(II) sulfate produces a white solid when it is heated. The white solid turns blue when water is added. Which word describes the reaction of hydrated copper(II) sulfate?

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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 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 18May/June 2026, paper 11Multiple choice1 mark

  When heated strongly, silicon(IV) oxide reacts with carbon. $${\mathrm{S}\mathrm{i}\mathrm{O}}_2+2\mathrm{C}\to \mathrm{S}\mathrm{i}+2\mathrm{C}\mathrm{O}$$ Which term describes what happens to silicon(IV) oxide?

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• Question 16Oct/Nov 2025, paper 11Multiple choice1 mark

  Iron(III) chloride, ${\text{FeCl}}_3$, is a brown solid. What is the meaning of (III) in the name?

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• Question 16Oct/Nov 2024, paper 11Multiple choice1 mark

  The equation for the reaction between hydrogen and oxygen is shown. $$2{\text{H}}_2(\text{g})+{\text{O}}_2(\text{g})\to 2{\text{H}}_2\text{O}(\text{g})$$ Which statement explains why this is a redox reaction?

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• Question 14Oct/Nov 2023, paper 11Multiple choice1 mark

  Solid S changes colour from white to blue when water is added. What is S?

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• Question 19May/June 2026, paper 11Multiple choice1 mark

  Potassium manganate(VII), ${\mathrm{K}\mathrm{M}\mathrm{n}\mathrm{O}}_4$, is a compound with a range of different uses. What does (VII) indicate about this compound?

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• Question 15Oct/Nov 2025, paper 12Multiple choice1 markHas a diagram

  In which test-tube is a physical change taking place?

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• Question 15Oct/Nov 2023, paper 11Multiple choice1 mark

  Which equation shows the reduction of copper?

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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 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 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 31Oct/Nov 2023, paper 11Multiple choice1 mark

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

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• Question 15May/June 2026, paper 12Multiple choice1 mark

  What is shown by the symbol $\rightleftharpoons$ in the equation for a chemical reaction?

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• Question 17Oct/Nov 2025, paper 12Multiple choice1 markHas a diagram

  When pink cobalt(II) chloride is heated, it forms a blue solid and water. When water is added to the blue solid, it releases heat and a pink solid is formed. Which row describes the type of reaction that occurs and the pink cobalt(II) chloride?

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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 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 18Oct/Nov 2025, paper 12Multiple choice1 mark

  What is the oxidation number of iron in iron(III) oxide, ${\text{Fe}}_2{\text{O}}_3$?

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• Question 18Oct/Nov 2024, paper 12Multiple choice1 mark

  When a few drops of water are added to a solid, E, the colour changes from blue to pink. What is E?

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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 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 15Oct/Nov 2025, paper 13Multiple choice1 mark

  Some physical and chemical changes are listed. 1 rusting of iron 2 condensing of steam 3 dissolving of sugar in water 4 cracking of alkanes Which changes are physical changes?

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• Question 19Oct/Nov 2024, paper 12Multiple choice1 mark

  The equation for the reaction of magnesium with copper(II) oxide is shown. $$\text{Mg}+\text{CuO}\to \text{MgO}+\text{Cu}$$ Which word describes this reaction?

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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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