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Modern analytical techniques: OCR A‑Level Chemistry B questions

Every OCR A-Level Chemistry B exam question on EL Modern analytical techniques (specification points EL(x)), 2016–2025, with its mark scheme and examiner’s report.

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2,049 questions

  1. Q27

    June 2025 · Paper 1

    1 markEL Modern analytical techniques
    The whole paper ↗
    June 2025 Paper 1, question 27: A sample of strontium contains two isotopes, strontium-86 and strontium-88. The relative atomic mass of the sample is 87.82. What is the % abundance of the stro

  2. Q3(e)

    June 2025 · AS Paper 2

    2 marksEL Modern analytical techniques
    The whole paper ↗
    June 2025 AS Paper 2, question 3(e): Magnesium exists as three isotopes: magnesium-24, 78.60%, magnesium-25, 10.11% and magnesium-26, 11.29%. Calculate a value for the Ar of magnesium. Give your an

  3. Q11

    June 2024 · Paper 1

    1 markEL Modern analytical techniques
    The whole paper ↗
    June 2024 Paper 1, question 11: The mass spectrum of a sample of an element is shown: intensity 69 71 What is the relative atomic mass of the sample? A 69.2 B 69.5 C 69.8 D 70.0 Your answer [1

  4. Q31(a)

    June 2023 · Paper 1

    2 marksEL Modern analytical techniques
    The whole paper ↗
    June 2023 Paper 1, question 31(a): Strontium is one of the elements in Group 2. Compounds of strontium are used in fireworks to give a crimson colour. Analysis of the mass spectrum of a sample of

  5. Q21(d)(ii)

    June 2023 · AS Paper 1

    2 marksEL Modern analytical techniques
    The whole paper ↗
    June 2023 AS Paper 1, question 21(d)(ii): Use the data in Table 21.2 to calculate a value for the relative atomic mass of this calcium sample. Give your answer to 2 decimal places. relative atomic mass

  6. Q1(h)(ii)

    June 2022 · Paper 2

    1 markEL Modern analytical techniques
    The whole paper ↗
    June 2022 Paper 2, question 1(h)(ii): Explain, without doing a calculation, how this data shows that the relative atomic mass of iron is below 56. [1]

  7. Q1(c)

    June 2022 · AS Paper 2

    2 marksEL Modern analytical techniques
    The whole paper ↗
    June 2022 AS Paper 2, question 1(c): The mass spectrum of magnesium shows that it has three stable isotopes as shown below. Isotope Abundance / % 24Mg 78.60 25Mg 10.11 26Mg 11.29 Calculate a value

  8. Q23(d)(i)

    November 2021 · AS Paper 1

    2 marksEL Modern analytical techniques
    The whole paper ↗
    November 2021 AS Paper 1, question 23(d)(i): Table 23.2 shows the stable isotopes of titanium and their abundances. 46Ti 47Ti 48Ti 49Ti 50Ti Isotope Percentage 8.25 7.44 73.72 5.41 5.18 abundance Table 23.

  9. Q2

    November 2020 · Paper 1

    1 markEL Modern analytical techniques
    The whole paper ↗
    November 2020 Paper 1, question 2: The mass spectrum of a sample of an element is shown below. 100 relative abundance 50 (%) 2 4 6 8 10 12 m / z What is the relative atomic mass of the element? A

  10. Q22(b)(i)

    November 2020 · AS Paper 1

    2 marksEL Modern analytical techniques
    The whole paper ↗
    November 2020 AS Paper 1, question 22(b)(i): Calculate the relative atomic mass of naturally-occurring carbon. Give your answer to 2 decimal places. relative atomic mass = [2]

  11. Q2(c)(ii)

    June 2019 · Paper 2

    2 marksEL Modern analytical techniques
    The whole paper ↗
    June 2019 Paper 2, question 2(c)(ii): Use the data to calculate the relative atomic mass of the strontium sample. Give your answer to 2 decimal places. relative atomic mass = [2]

  12. Q3(c)

    June 2019 · AS Paper 2

    2 marksEL Modern analytical techniques
    The whole paper ↗
    June 2019 AS Paper 2, question 3(c): The element indium was discovered in 1863 from an emission spectrum. Indium has two naturally occurring isotopes as shown in the table. Isotope Isotopic mass 11

  13. Q22(d)

    June 2018 · AS Paper 1

    2 marksEL Modern analytical techniques
    The whole paper ↗
    June 2018 AS Paper 1, question 22(d): Gallium has two isotopes, 69Ga and 71Ga. The Ar of gallium is 69.7. Calculate the relative abundance of 69Ga as a percentage. relative abundance of 69Ga = % [2]

  14. Q21(b)

    June 2017 · AS Paper 1

    2 marksEL Modern analytical techniques
    The whole paper ↗
    June 2017 AS Paper 1, question 21(b): Calculate a value for the Ar of chlorine. Give your answer to two decimal places. Ar = [2]

  15. Q21(c)(ii)

    June 2017 · AS Paper 1

    2 marksEL Modern analytical techniques
    The whole paper ↗
    June 2017 AS Paper 1, question 21(c)(ii): Explain the ratio of the heights of the peaks at m/z 64 and m/z 66. [2]

  16. Q21(b)

    June 2016 · AS Paper 1

    2 marksEL Modern analytical techniques
    The whole paper ↗
    June 2016 AS Paper 1, question 21(b): Naturally occurring silicon has three isotopes, as shown in the table. Isotope Si-28 Si-29 Si-30 % abundance 92.17 4.71 3.12 Calculate an Ar value for Si from t
All 16 questions on Modern analytical techniques, as a list
  1. June 2025, Paper 1, Q27 (1 mark): A sample of strontium contains two isotopes, strontium-86 and strontium-88. The relative atomic mass of the sample is 87.82. What is the % abundance of the stro
  2. June 2025, AS Paper 2, Q3(e) (2 marks): Magnesium exists as three isotopes: magnesium-24, 78.60%, magnesium-25, 10.11% and magnesium-26, 11.29%. Calculate a value for the Ar of magnesium. Give your an
  3. June 2024, Paper 1, Q11 (1 mark): The mass spectrum of a sample of an element is shown: intensity 69 71 What is the relative atomic mass of the sample? A 69.2 B 69.5 C 69.8 D 70.0 Your answer [1
  4. June 2023, Paper 1, Q31(a) (2 marks): Strontium is one of the elements in Group 2. Compounds of strontium are used in fireworks to give a crimson colour. Analysis of the mass spectrum of a sample of
  5. June 2023, AS Paper 1, Q21(d)(ii) (2 marks): Use the data in Table 21.2 to calculate a value for the relative atomic mass of this calcium sample. Give your answer to 2 decimal places. relative atomic mass
  6. June 2022, Paper 2, Q1(h)(ii) (1 mark): Explain, without doing a calculation, how this data shows that the relative atomic mass of iron is below 56. [1]
  7. June 2022, AS Paper 2, Q1(c) (2 marks): The mass spectrum of magnesium shows that it has three stable isotopes as shown below. Isotope Abundance / % 24Mg 78.60 25Mg 10.11 26Mg 11.29 Calculate a value
  8. November 2021, AS Paper 1, Q23(d)(i) (2 marks): Table 23.2 shows the stable isotopes of titanium and their abundances. 46Ti 47Ti 48Ti 49Ti 50Ti Isotope Percentage 8.25 7.44 73.72 5.41 5.18 abundance Table 23.
  9. November 2020, Paper 1, Q2 (1 mark): The mass spectrum of a sample of an element is shown below. 100 relative abundance 50 (%) 2 4 6 8 10 12 m / z What is the relative atomic mass of the element? A
  10. November 2020, AS Paper 1, Q22(b)(i) (2 marks): Calculate the relative atomic mass of naturally-occurring carbon. Give your answer to 2 decimal places. relative atomic mass = [2]
  11. June 2019, Paper 2, Q2(c)(ii) (2 marks): Use the data to calculate the relative atomic mass of the strontium sample. Give your answer to 2 decimal places. relative atomic mass = [2]
  12. June 2019, AS Paper 2, Q3(c) (2 marks): The element indium was discovered in 1863 from an emission spectrum. Indium has two naturally occurring isotopes as shown in the table. Isotope Isotopic mass 11
  13. June 2018, AS Paper 1, Q22(d) (2 marks): Gallium has two isotopes, 69Ga and 71Ga. The Ar of gallium is 69.7. Calculate the relative abundance of 69Ga as a percentage. relative abundance of 69Ga = % [2]
  14. June 2017, AS Paper 1, Q21(b) (2 marks): Calculate a value for the Ar of chlorine. Give your answer to two decimal places. Ar = [2]
  15. June 2017, AS Paper 1, Q21(c)(ii) (2 marks): Explain the ratio of the heights of the peaks at m/z 64 and m/z 66. [2]
  16. June 2016, AS Paper 1, Q21(b) (2 marks): Naturally occurring silicon has three isotopes, as shown in the table. Isotope Si-28 Si-29 Si-30 % abundance 92.17 4.71 3.12 Calculate an Ar value for Si from t

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