Topic 10C
Spectra
Spectra let a compound be identified without touching it. These pages read the molecular ion and fragment ions of a mass spectrum, match infrared absorptions to bonds using the Data Booklet, and then combine both with test-tube reactions to solve an unknown.
Revision Notes
3 revision notes, in the order the specification teaches them.
Mass Spectra of Organic Compounds
Mass spectra of organic compounds: molecular ion, m/z, fragmentation patterns, common fragments, M+2 peaks for chlorine and bromine.
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Infrared Spectroscopy
Infrared spectroscopy: bond vibrations, wavenumbers, characteristic absorptions of functional groups, broad O–H bands, the fingerprint region and identifying compounds.
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Identifying Unknown Compounds
Identifying unknown organic compounds: combining the molecular ion, fragmentation, infrared absorptions and chemical tests, with a worked example.
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Summary map
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Spectra Summary Map
Edexcel International A Level Chemistry · Unit 2 · Topic 10D Mass Spectra and Infrared
The whole section on one A4 page: the molecular ion, the M+1 peak, fragmentation, infrared absorption, reading IR spectra and Core Practical 8, with worked examples.
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Match reagents to products, with your board's reagents and conditions.
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Specification
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10.21
10.22
- i
be able to use infrared spectra, or data from infrared spectra, to deduce functional groups present in organic compounds, and predict infrared absorptions, given wavenumber data, due to familiar functional groups including: C–H stretching absorptions in alkanes, alkenes and aldehydes
Revise - ii
be able to use infrared spectra, or data from infrared spectra, to deduce functional groups present in organic compounds, and predict infrared absorptions, given wavenumber data, due to familiar functional groups including: C=C stretching absorption in alkenes
Revise - iii
be able to use infrared spectra, or data from infrared spectra, to deduce functional groups present in organic compounds, and predict infrared absorptions, given wavenumber data, due to familiar functional groups including: O–H stretching absorptions in alcohols and carboxylic acids
Revise - iv
be able to use infrared spectra, or data from infrared spectra, to deduce functional groups present in organic compounds, and predict infrared absorptions, given wavenumber data, due to familiar functional groups including: C=O stretching absorptions in aldehydes, ketones and carboxylic acids
Revise - v
be able to use infrared spectra, or data from infrared spectra, to deduce functional groups present in organic compounds, and predict infrared absorptions, given wavenumber data, due to familiar functional groups including: C–X stretching absorption in halogenoalkanes
Revise - vi
be able to use infrared spectra, or data from infrared spectra, to deduce functional groups present in organic compounds, and predict infrared absorptions, given wavenumber data, due to familiar functional groups including: N-H stretching absorption in amines
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10.23
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