Learning objective
Interpret mass spectra to identify molecular ion peaks.
Read the explanation, check the common trap, then practise with flashcards and questions.
At a glance
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Topic
Organic analysis
Subtopic
Test-tube reactions and mass spectrometry
Study support
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Quick explanation
Interpret mass spectra to identify molecular ion peaks
- This point belongs to Organic analysis, especially Test-tube reactions and mass spectrometry.
- You need to be able to interpret mass spectra to identify molecular ion peaks.
- The key ideas to know are molecular ion.
- Use the linked flashcards and practice questions to check recall, then practise applying the idea in an exam-style answer.
Key concepts
Why it matters
This objective helps connect Test-tube reactions and mass spectrometry to exam-style questions, flashcards, and revision notes for Organic analysis.
Quick student answer
In a mass spectrum, what does the molecular ion peak represent?
Direct answer
A peak corresponding to the molecular weight of the compound.
Key terms
- Molecular Ion Peak: The peak in a mass spectrum that corresponds to the molecular weight of the intact molecule.
- Fragmentation: The process by which a molecular ion breaks into smaller ions during mass spectrometry.
Common trap
Confusing molecular ion peak with base peak: Remember that the molecular ion peak indicates the molecular weight, while the base peak represents the most abundant ion.
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Revision tools
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Revision notestopic notes
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Open revision notesRelated learning objectives
- Use test-tube reactions to identify alcohols, aldehydes, alkenes and carboxylic acids.
Test-tube reactions and mass spectrometry
- Use fragmentation evidence to support structural identification.
Test-tube reactions and mass spectrometry
- Required practical: tests for alcohol, aldehyde, alkene and carboxylic acid.
Test-tube reactions and mass spectrometry
- Use infrared absorption data to identify functional groups.
Infrared spectroscopy
- Interpret the fingerprint region by comparison with reference spectra.
Infrared spectroscopy