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Energy and matter: OCR A‑Level Chemistry B questions

Every OCR A-Level Chemistry B exam question on CD Energy and matter (specification points CD(m)), 2016–2025, with its mark scheme and examiner’s report.

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2,049 questions

  1. Q28

    June 2025 · Paper 1

    1 markCD Energy and matter
    The whole paper ↗
    June 2025 Paper 1, question 28: An organic compound is yellow. Which statement(s) is / are correct? 1 The compound absorbs blue light. 2 The electron energy levels in the molecule have a separ

  2. Q3(b)(ii)

    June 2023 · Paper 3

    3 marksCD Energy and matter
    The whole paper ↗
    June 2023 Paper 3, question 3(b)(ii): Explain why indigo has a blue colour. [3]

  3. Q28

    June 2022 · Paper 1

    1 markCD Energy and matter
    The whole paper ↗
    June 2022 Paper 1, question 28: Which statement(s) is/are correct about an orange dye? 1 Blue light is absorbed when electrons rise to higher energy levels. 2 Orange light is emitted when elec

  4. Q3(d)(i)

    November 2021 · Paper 2

    3 marksCD Energy and matter
    The whole paper ↗
    November 2021 Paper 2, question 3(d)(i): A student says the colour occurs because nitrobenzaldehyde absorbs the complementary colour to yellow and emits yellow light. Comment on the student’s statement

  5. Q34(c)(i)

    November 2020 · Paper 1

    3 marksCD Energy and matter
    The whole paper ↗
    November 2020 Paper 1, question 34(c)(i): Explain why dye C absorbs visible light. [3]

  6. Q34(c)(ii)

    November 2020 · Paper 1

    1 markCD Energy and matter
    The whole paper ↗
    November 2020 Paper 1, question 34(c)(ii): How is the colour of the light absorbed related to the light seen? [1]

  7. Q1(b)(ii)

    June 2018 · Paper 3

    4 marksCD Energy and matter
    The whole paper ↗
    June 2018 Paper 3, question 1(b)(ii): The azo dye formed above has an extended delocalised system. Describe the bonding occurring in a delocalised system and explain why this can lead to organic com

  8. Q5(b)(i)

    June 2017 · Paper 2

    6 marksCD Energy and matter
    The whole paper ↗
    June 2017 Paper 2, question 5(b)(i): (i)* Lignin contains chromophores that absorb in the uv, whereas the decomposition products look yellow. Explain what affects the frequency of radiation absorbe
All 8 questions on Energy and matter, as a list
  1. June 2025, Paper 1, Q28 (1 mark): An organic compound is yellow. Which statement(s) is / are correct? 1 The compound absorbs blue light. 2 The electron energy levels in the molecule have a separ
  2. June 2023, Paper 3, Q3(b)(ii) (3 marks): Explain why indigo has a blue colour. [3]
  3. June 2022, Paper 1, Q28 (1 mark): Which statement(s) is/are correct about an orange dye? 1 Blue light is absorbed when electrons rise to higher energy levels. 2 Orange light is emitted when elec
  4. November 2021, Paper 2, Q3(d)(i) (3 marks): A student says the colour occurs because nitrobenzaldehyde absorbs the complementary colour to yellow and emits yellow light. Comment on the student’s statement
  5. November 2020, Paper 1, Q34(c)(i) (3 marks): Explain why dye C absorbs visible light. [3]
  6. November 2020, Paper 1, Q34(c)(ii) (1 mark): How is the colour of the light absorbed related to the light seen? [1]
  7. June 2018, Paper 3, Q1(b)(ii) (4 marks): The azo dye formed above has an extended delocalised system. Describe the bonding occurring in a delocalised system and explain why this can lead to organic com
  8. June 2017, Paper 2, Q5(b)(i) (6 marks): (i)* Lignin contains chromophores that absorb in the uv, whereas the decomposition products look yellow. Explain what affects the frequency of radiation absorbe

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