Experimental techniques and chemical analysis: past paper questions

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• Question 16May/June 2026, paper 11Multiple choice1 markHas a diagram

  Zinc is reacted with dilute sulfuric acid to produce hydrogen gas. The acid is poured through a funnel into a conical flask containing zinc. Which apparatus could be used to measure the total volume of gas produced?

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• Question 39Oct/Nov 2024, paper 11Multiple choice1 markHas a diagram

  Dyes are coloured substances. The chromatogram of substance X and four different dyes, 1, 2, 3 and 4, is shown. Substance X contains only two of the dyes 1, 2, 3 and 4.

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• Question 18Oct/Nov 2023, paper 11Multiple choice1 mark

  Copper(II) sulfate is formed by reacting excess solid copper(II) carbonate with dilute sulfuric acid. Which processes are part of the preparation of solid copper(II) sulfate?

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• Question 39May/June 2026, paper 11Multiple choice1 mark

  Which piece of apparatus is used to measure accurately the volume of a liquid in an acid–base titration?

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• Question 37Oct/Nov 2025, paper 11Multiple choice1 markHas a diagram

  Four dyes, P, Q, R and S, are analysed using chromatography. Water is the solvent. The chromatogram produced is shown.

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• Question 40Oct/Nov 2024, paper 11Multiple choice1 mark

  The results of two tests on substance G are listed. ● A flame test produces a yellow flame. ● Substance G is added to aqueous sodium hydroxide and powdered aluminium and warmed carefully.

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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 40May/June 2026, paper 11Multiple choice1 mark

  Aqueous X reacts with aqueous $\mathrm{N}\mathrm{a}\mathrm{O}\mathrm{H}$ to produce a white precipitate that is soluble in excess aqueous $\mathrm{N}\mathrm{a}\mathrm{O}\mathrm{H}$. Aqueous X reacts with acidified aqueous $\mathrm{B}\mathrm{a}({\mathrm{N}\mathrm{O}}_3{)}_2$ to produce a white precipitate. What is X?

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• Question 38Oct/Nov 2025, paper 11Multiple choice1 markHas a diagram

  The apparatus used to separate a mixture is shown. What is the mixture?

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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 39Oct/Nov 2023, paper 11Multiple choice1 mark

  The equation for the reaction of aqueous calcium nitrate and aqueous sodium hydroxide is shown.

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• Question 38May/June 2026, paper 12Multiple choice1 mark

  Which processes are required to separate sand from a mixture of solid sodium chloride and sand?

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• Question 39Oct/Nov 2025, paper 11Multiple choice1 markHas a diagram

  Two different white solids are heated and the gases formed are tested. The gas from solid 1 turns damp red litmus paper blue. The gas from solid 2 relights a glowing splint.

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• Question 23Oct/Nov 2024, paper 12Multiple choice1 mark

  The following steps are done to prepare solid magnesium sulfate.

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• Question 40Oct/Nov 2023, paper 11Multiple choice1 markHas a diagram

  The results of two tests on aqueous compound X are given. | test | result | |---|---| | warm with aluminium foil and aqueous sodium hydroxide | ammonia is produced | | aqueous sodium hydroxide | brown precipitate | What is X?

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• Question 39May/June 2026, paper 12Multiple choice1 mark

  Which statement about chlorine gas is correct?

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• Question 40Oct/Nov 2025, paper 11Multiple choice1 mark

  Which aqueous ion gives a blue precipitate when aqueous sodium hydroxide is added?

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• Question 37Oct/Nov 2024, paper 12Multiple choice1 markHas a diagram

  Four different organic compounds are separated by a fractionating column. The table shows the boiling points of the compounds.

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• Question 31Oct/Nov 2023, paper 12Multiple choice1 markHas a diagram

  The flow chart shows stages in the treatment of river water to produce drinking water.

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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 38Oct/Nov 2024, paper 12Multiple choice1 mark

  Which piece of apparatus is used to measure exactly $21.50{\text{ cm}}^3$ of dilute sulfuric acid?

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• Question 33Oct/Nov 2023, paper 12Multiple choice1 mark

  What are the main substances produced by the fractional distillation of liquid air?

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• Question 11May/June 2026, paper 13Multiple choice1 mark

  Substance X is electrolysed.

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• Question 21Oct/Nov 2025, paper 12Multiple choice1 mark

  Which mixture of solids is separated by adding water, stirring, and then using filtration?

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• Question 39Oct/Nov 2024, paper 12Multiple choice1 markHas a diagram

  Which row shows an advantage and a disadvantage for the stated apparatus used in a titration?

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• Question 38Oct/Nov 2023, paper 12Multiple choice1 mark

  An acid–base titration is described. ● $25.0{\text{ cm}}^3$ of dilute aqueous alkali is put into a conical flask. ● Indicator is added to the flask.

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• Question 39Oct/Nov 2025, paper 12Multiple choice1 markHas a diagram

  The table shows the observations of two tests on an aqueous solution of a solid.

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• Question 40Oct/Nov 2024, paper 12Multiple choice1 markHas a diagram

  Sample M contains calcium carbonate and sodium nitrate. The result of adding water to M, stirring and filtering is shown. No chemical reaction occurs.

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• Question 39Oct/Nov 2023, paper 12Multiple choice1 markHas a diagram

  The apparatus shown is used to separate a mixture. What is the mixture?

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• Question 30May/June 2026, paper 13Multiple choice1 mark

  In a titration, why is distilled water and not tap water used to rinse the burette?

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