plumiIdentifying the products of chemical reactions: OCR GCSE Chemistry A questions
Every OCR GCSE Chemistry A exam question on C4.2 Identifying the products of chemical reactions, 2018–2025, with its mark scheme and examiner’s report.
Paper
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Exam
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Calculations
- Your answer
Q19(c)
The whole paper ↗Q21(a)
The whole paper ↗Q21(b)
The whole paper ↗- Your answer
Q21(a)
The whole paper ↗Q21(b)
The whole paper ↗- Your answer
- Your answer
Q18(c)(iii)
The whole paper ↗Q21(c)
The whole paper ↗- Your answer
Q16(c)
The whole paper ↗- Your answer
- Your answer
Q16(d)
The whole paper ↗Q22(a)(i)
The whole paper ↗Q22(a)(ii)
The whole paper ↗Q22(b)
The whole paper ↗Q22(c)
The whole paper ↗
All 60 questions on Identifying the products of chemical reactions, as a list
- June 2025, Paper 2 Foundation, Q2 (1 mark): A student adds sodium hydroxide to a solution containing copper ions. Which colour precipitate is made? A Blue B Green C Orange-brown D White Your answer [1]
- June 2025, Paper 2 Foundation, Q19(c) (2 marks): Describe the test for carbon dioxide gas. Test Result [2]
- June 2025, Paper 2 Foundation, Q21(a) (6 marks): (a)* A teacher finds an unlabelled beaker containing a white solid. They think the solid is one of the following: • lithium bromide • lithium iodide • sodium ca
- June 2025, Paper 2 Foundation, Q21(b) (2 marks): Instrumental methods of analysis can be used to analyse chemical substances. State two advantages of instrumental methods of analysis. 1 2 [2]
- June 2025, Paper 4 Higher, Q12 (1 mark): Potash alum, KAl (SO4)2, is a chemical compound. What is the test to identify the Group 1 metal in potash alum? A A flame test gives a lilac flame. B A white pr
- June 2025, Paper 4 Higher, Q21(a) (6 marks): (a)* A teacher finds an unlabelled beaker containing a white solid. They know that the solid is one of the following: • lithium bromide • lithium iodide • sodiu
- June 2025, Paper 4 Higher, Q21(b) (2 marks): Instrumental methods of analysis can be used to analyse chemical substances. State two advantages of instrumental methods of analysis. 1 2 [2]
- June 2024, Paper 2 Foundation, Q1 (1 mark): What is the test for oxygen gas? A Burns with a lilac flame B Burns with a squeaky pop C Relights a glowing splint D Turns limewater milky Your answer [1]
- June 2024, Paper 2 Foundation, Q2 (1 mark): A student adds sodium hydroxide solution to copper sulfate solution. What is the colour of the precipitate made? A Blue B Green C Orange-brown D White Your answ
- June 2024, Paper 2 Foundation, Q18(c)(iii) (2 marks): Describe the test for chlorine gas. [2]
- June 2024, Paper 2 Foundation, Q21(c) (2 marks): Group 7 ions can be identified using silver nitrate solution. A student tests a compound for chloride ions. The diagram shows the student’s experiment. Solution
- June 2024, Paper 4 Higher, Q15 (1 mark): Which carbon compound produces this mass spectrum? Relative abundance 10 20 30 40 50 60 70 Mass to charge ratio Relative atomic mass (Ar): C = 12.0 H = 1.0 A C2
- June 2024, Paper 4 Higher, Q16(c) (2 marks): Group 7 ions can be identified using silver nitrate solution. A student tests a compound for chloride ions. The diagram shows the student’s experiment. Add silv
- June 2023, Paper 2 Foundation, Q1 (1 mark): A student does a flame test with a sample of potassium chloride. Which colour is the flame? A Lilac B Green‑blue C Red D Yellow Your answer [1]
- June 2023, Paper 2 Foundation, Q2 (1 mark): What is the test for chlorine gas? A Damp universal indicator paper turns red then white B Decolourises bromine water C Limewater turns milky D Relights a glowi
- June 2023, Paper 2 Foundation, Q16(d) (2 marks): Describe the test for hydrogen gas. [2]
- June 2023, Paper 2 Foundation, Q22(a)(i) (1 mark): State the name of the acid the student should have used. [1]
- June 2023, Paper 2 Foundation, Q22(a)(ii) (2 marks): Explain why using dilute hydrochloric acid would affect the results of this test. [2]
- June 2023, Paper 2 Foundation, Q22(b) (2 marks): The student repeats the test for halide ions using the correct acid and silver nitrate solution. They also test each solution using a few drops of dilute hydroc
- June 2023, Paper 2 Foundation, Q22(c) (3 marks): Solution A also contains copper ions, Cu2+. Copper ions react with hydroxide ions, OH–, to make a precipitate of copper(II) hydroxide. Write the balanced ionic
- June 2023, Paper 4 Higher, Q16(a)(i) (1 mark): State the name of the acid the student should have used. [1]
- June 2023, Paper 4 Higher, Q16(a)(ii) (2 marks): Explain why using dilute hydrochloric acid would affect the results of this test. [2]
- June 2023, Paper 4 Higher, Q16(b) (2 marks): The student repeats the test for halide ions using the correct acid and silver nitrate solution. They also test each solution using a few drops of dilute hydroc
- June 2023, Paper 4 Higher, Q16(c) (3 marks): Solution A also contains copper ions, Cu2+. Copper ions react with hydroxide ions, OH–, to make a precipitate of copper(II) hydroxide. Write the balanced ionic
- June 2023, Paper 4 Higher, Q22(d) (1 mark): The diagram shows the mass spectrum for a compound containing chlorine. 100 80 60 Relative abundance 40 20 0 10 20 30 40 50 60 Mass to charge ratio State the re
- June 2023, Paper 4 Higher, Q22(e) (2 marks): Instrumental methods of analysis, such as mass spectrometry, have advantages over simple chemical methods of analysis. State two advantages of instrumental meth
- June 2022, Paper 2 Foundation, Q2 (1 mark): What is the test for oxygen gas? A Ignites with a squeaky pop. B Limewater turns milky. C Relights a glowing splint. D Turns damp blue litmus paper white. Your
- June 2022, Paper 2 Foundation, Q13 (1 mark): What is the test for halide ions? A Add a few drops of dilute nitric acid then a few drops of silver nitrate solution. B Add a few drops of hydrochloric acid th
- June 2022, Paper 2 Foundation, Q23(d) (1 mark): The teacher performs a flame test of the copper made by the electrolysis of X. What colour flame does the teacher observe? [1]
- June 2022, Paper 4 Higher, Q4 (1 mark): Which test identifies sulfate ions? A A flame test B Adding a few drops of barium chloride solution C Adding a few drops of silver nitrate solution D Adding a f
- June 2022, Paper 4 Higher, Q17(d) (1 mark): The teacher performs a flame test of the copper made by the electrolysis of X. What colour flame does the teacher observe? [1]
- June 2022, Paper 4 Higher, Q22(b)(i) (2 marks): Cation Na+ Test Result [2]
- June 2022, Paper 4 Higher, Q22(b)(ii) (2 marks): Anion Cl – Test Result [2]
- November 2021, Paper 2 Foundation, Q3 (1 mark): Which metal ion gives a lilac colour in a flame test? A Copper B Lithium C Potassium D Sodium Your answer [1]
- November 2021, Paper 2 Foundation, Q16(b)(ii) (2 marks): How would you test for this gas? [2]
- November 2021, Paper 2 Foundation, Q19(b) (2 marks): Describe the test for carbon dioxide gas. [2]
- November 2021, Paper 2 Foundation, Q21(a) (3 marks): Explain how the mass spectrum and the infrared spectrum show that the sample is ethanol, C2H5OH. [3]
- November 2021, Paper 2 Foundation, Q21(b) (2 marks): Mass spectrometry and infrared spectrometry are both examples of instrumental methods of analysis. Describe two advantages of instrumental methods of analysis.
- November 2021, Paper 4 Higher, Q16(a) (3 marks): Explain how the mass spectrum and the infrared spectrum show that the sample is ethanol, C2H5OH. [3]
- November 2021, Paper 4 Higher, Q16(b) (2 marks): Mass spectrometry and infrared spectrometry are both examples of instrumental methods of analysis. Describe two advantages of instrumental methods of analysis.
- November 2021, Paper 4 Higher, Q23(a) (3 marks): Use the results of tests 1 and 2 to write the formula of compound Y. [3]
- November 2021, Paper 4 Higher, Q23(b)(i) (1 mark): The student adds a few drops of sodium hydroxide solution to a solution of compound Z. A white precipitate forms. Explain why this result does not identify the
- November 2021, Paper 4 Higher, Q23(b)(ii) (1 mark): The student adds some dilute hydrochloric acid and a few drops of silver nitrate solution to a fresh solution of compound Z. A white precipitate forms. The stud
- November 2021, Paper 4 Higher, Q23(b)(iii) (1 mark): Describe how the student could improve the test in part (ii) to confirm that the anion in compound Z is a chloride ion, Cl –. [1]
- November 2020, Paper 2 Foundation, Q2 (1 mark): A student adds a few drops of sodium hydroxide solution to an unknown solution and a blue precipitate is made. Which metal ion is present in the original soluti
- November 2020, Paper 2 Foundation, Q9 (1 mark): The table shows the stages in a flame test. Stage Process 1 Dip a nichrome wire loop into the test solution. 2 Observe and record the flame colour. 3 Clean a ni
- November 2020, Paper 2 Foundation, Q17(a) (1 mark): Which ion is shown to be in the white solid by the result of Test 1? [1]
- November 2020, Paper 2 Foundation, Q17(b)(i) (1 mark): Which ion is shown to be in the white solid by the result of Test 2? [1]
- November 2020, Paper 2 Foundation, Q17(b)(ii) (1 mark): The gas given off in Test 2 is carbon dioxide, CO2. What is the expected result with limewater? [1]
- June 2019, Paper 2 Foundation, Q11 (1 mark): Which statement describes the test for chlorine gas? A A lighted splint makes a squeaky pop. B Limewater turns milky. C A glowing splint re-lights. D Damp litmu
- June 2019, Paper 2 Foundation, Q14 (1 mark): Which statement describes the advantages of instrumental methods of analysis? A Instruments can analyse very small amounts and carry out the analyses slowly. B
- June 2019, Paper 4 Higher, Q1 (1 mark): Which statement describes the advantages of instrumental methods of analysis? A Instruments can analyse very small amounts and carry out the analyses slowly. B
- June 2019, Paper 4 Higher, Q6 (1 mark): A student tests a solution for chloride ions. She adds dilute nitric acid to the solution. She then adds a few drops of silver nitrate solution. Why does she ne
- June 2019, Paper 4 Higher, Q14 (1 mark): Which statement about a mass spectrum of a molecule is correct? A Each peak represents an atom in the molecule. B The charge to mass ratio of the molecular ion
- June 2018, Paper 2 Foundation, Q2 (1 mark): Damp litmus paper is used to test for chlorine gas. Which statement describes the correct result of the test for chlorine gas? A Damp blue litmus paper turns re
- June 2018, Paper 2 Foundation, Q6 (1 mark): Look at the mass spectrum of a carbon compound. 100 80 Relative 60 abundance 40 20 0.0 10 20 30 40 50 60 m / z Which carbon compound is the mass spectrum from?
- June 2018, Paper 2 Foundation, Q20(a) (3 marks): Describe how the student does the flame test in Test 1. You may draw a labelled diagram to help your answer. [3]
- June 2018, Paper 2 Foundation, Q20(b) (6 marks): A student wants to identify the ions contained in a solid, X. She dissolves the solid in some water and then does some tests on the solution. Look at the table
- June 2018, Paper 4 Higher, Q1 (1 mark): Look at the mass spectrum of a carbon compound. 100 80 Relative 60 abundance 40 20 0.0 10 20 30 40 50 60 m / z Which carbon compound is the mass spectrum from?
- June 2018, Paper 4 Higher, Q14 (1 mark): A gas chromatogram is a chart that represents different substances in a mixture. 7000 6000 5000 4000 Detector response 3000 2000 1000 0 0 0.2 0.4 0.6 0.8 1.0 1.
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