plumiPredicting mass spectra of diatomic molecules: Edexcel International A Level Chemistry questions
Edexcel International A Level Chemistry past-paper questions on 2.1.3 Predicting mass spectra of diatomic molecules, 2019–2025, with mark schemes and examiner’s reports where available.
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Q22(d)
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Open the full PDFYour answerQ24(c)(i)
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All 11 questions on Predicting mass spectra of diatomic molecules, as a list
- June 2025, AS Unit 1, Q22(d) (2 marks): Chlorine can be analysed in a mass spectrometer. On the grid shown, draw the spectrum you would expect to see for the molecular ion peaks for a chlorine molecul
- June 2024, Unit 5, Q15(d)(i) (2 marks): Explain the relative intensities of the peaks at m / z values of 162, 164 and 166. (2)
- January 2024, AS Unit 1, Q19(a) (2 marks): 2‑Chloropropane has a relative molecular mass of 78.5 g mol–1. Chlorine has two common isotopes, 35Cl and 37Cl. There are three times more 35Cl atoms than 37Cl
- October 2023, AS Unit 1, Q9 (1 mark): A sample of the element chlorine, Cl2, was analysed in a mass spectrometer. Chlorine has two isotopes. What is the total number of peaks, due to ions with a sin
- October 2022, AS Unit 1, Q10(c) (1 mark): Naturally‑occurring chlorine has two isotopes, 35Cl and 37Cl. How many peaks due to the singly-charged molecular ions are seen in the mass spectrum of chlorine,
- June 2022, AS Unit 1, Q20(c)(iii) (2 marks): On the mass spectrum grid, draw the peaks for the bromine molecular ions, showing the relative peak heights. The bromine isotopes in this sample have the same r
- June 2021, AS Unit 1, Q2 (1 mark): Iodine exists as one isotope with mass number 127. Chlorine exists as two isotopes with mass numbers 35 and 37. How many molecular ion (ICl3 +) peaks are there
- January 2020, AS Unit 1, Q18(f)(i) (2 marks): Complete the mass spectrum for a sample of chlorine gas to show the expected molecular ion peaks due to Cl2 + . (2) 100 90 80 70 60 Relative 50 abundance 40 30
- January 2020, AS Unit 1, Q18(f)(ii) (2 marks): Suggest why there could be a small peak at m / z = 36 in the mass spectrum of chlorine gas. (2)
- June 2019, AS Unit 1, Q11 (1 mark): The two stable isotopes of bromine have relative masses of 79 and 81. Which is the correct pattern of peaks in the mass spectrum of molecular bromine? Relative
- January 2019, AS Unit 1, Q24(c)(i) (2 marks): A sample of nitrogen trichloride contained only nitrogen atoms with mass number 14, and chlorine atoms with mass numbers 35 and 37. Give the formula and mass/ch
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