Topic 7
Modern
Analytical
Techniques I
Topic 7 introduces instrumental analysis through mass spectrometry and infrared spectroscopy. Students use spectra to identify molecular ions, fragmentation patterns and functional groups in organic compounds.
Revision Notes
3 revision notes, in the order the specification teaches them.
Mass Spectrometry
Using molecular ion peaks and fragmentation patterns to suggest possible structures of organic compounds.
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Infrared Spectroscopy
Using infrared absorptions to identify functional groups, including C-H, C=C, O-H, C=O and N-H bonds.
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Identifying Unknown Compounds
Combining mass spectra, infrared spectra and test-tube reactions to deduce the structure of an unknown, with a worked example.
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Spectra Summary Map
Edexcel A Level Chemistry · Topic 7 Modern Analytical Techniques I
The whole topic on one A4 page: the molecular ion, the M+1 peak, fragmentation, infrared absorption, reading IR spectra and Core Practical 7, with worked examples.
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Specification
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Self-assessment · 19 points
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7
- A.1i
be able to use data from a mass spectrometer to: determine the relative molecular mass of an organic compound from the molecular ion peak
Revise - A.1ii
be able to use data from a mass spectrometer to: suggest possible structures of a simple organic compound from the m/z of the molecular ion and fragmentation patterns
Revise - B.2ii
be able to use data from infrared spectra to deduce functional groups present in organic compounds and to predict infrared absorptions, given wavenumber data, due to familiar functional groups, including: C=C stretching absorption in alkenes
Revise - B.2iii
be able to use data from infrared spectra to deduce functional groups present in organic compounds and to predict infrared absorptions, given wavenumber data, due to familiar functional groups, including: O–H stretching absorption in alcohols
Revise - B.2v d
be able to predict IR absorptions for broad O-H stretching absorption in carboxylic acids
Revise - B.2vi
be able to use data from infrared spectra to deduce functional groups present in organic compounds and to predict infrared absorptions, given wavenumber data, due to familiar functional groups, including: N–H stretching absorption in amines
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