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SingaporeChemistryQuick questions

Analytical Techniques

Quick questions on Mass spectrometry and molecular mass: Singapore A-Level H2 Chemistry

4short Q&A pairs drawn directly from our worked dot-point answer. For full context and worked exam questions, read the parent dot-point page.

What are isotope patterns?
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Some elements have more than one common isotope, producing extra peaks:
What is q1?
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A mass spectrum has its highest non-isotope peak at m/z=46m/z = 46. State the relative molecular mass and suggest the compound. [2 marks]
What is q2?
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Explain why a compound containing one chlorine atom shows two molecular ion peaks in a 3:1 ratio. [2 marks]
What is q3?
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A molecular ion at m/z=60m/z = 60 gives a fragment at m/z=45m/z = 45. Identify the group lost. [1 mark]

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