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WJEC
CBAC
AS/A LEVEL GCE in
Chemistry
REVISION AID
UNIT 4 A Level
by
P.J.Barratt

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Page 4

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i
A Level
UNIT CH4 Spectroscopy and Organic Chemistry (Analysing and building molecules)
This unit builds on the foundation ideas of spectroscopy and basic organic chemistry introduced
at AS level and goes on to explore these concepts in more detail.
It also explores the use of these topics in structure…

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1
Topic 9 Spectroscopy
Spectroscopic techniques are invaluable tools in the determination of structure. Mass
spectrometry has already been encountered in the AS units. At A level infrared and nmr
spectroscopy are encountered.
Candidates should be able to:
(a) recall the energy gradation across the electromagnetic spectrum from u.v. to…

Page 7

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If the number of protons and the number of neutrons are both even then the nucleus
has no overall
spin.
If the number of protons plus the number of neutrons is odd, then the nucleus has half
integer spin.
If the number of protons and the number of neutrons are…

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Page 9

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2 In the absence of a magnetic field the spin energy levels are the same but in the
presence of a magnetic
field, the energy levels split.
The most common form of nmr is proton nmr. The H1
1

atom has a nuclear spin of 1/2 and such
hydrogen atoms…

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Pages in this set

Page 1

Preview of page 1

Page 2

Preview of page 2
WJEC
CBAC
AS/A LEVEL GCE in
Chemistry
REVISION AID
UNIT 4 A Level
by
P.J.Barratt

Page 3

Preview of page 3

Page 4

Preview of page 4
i
A Level
UNIT CH4 Spectroscopy and Organic Chemistry (Analysing and building molecules)
This unit builds on the foundation ideas of spectroscopy and basic organic chemistry introduced
at AS level and goes on to explore these concepts in more detail.
It also explores the use of these topics in structure…

Page 5

Preview of page 5

Page 6

Preview of page 6
1
Topic 9 Spectroscopy
Spectroscopic techniques are invaluable tools in the determination of structure. Mass
spectrometry has already been encountered in the AS units. At A level infrared and nmr
spectroscopy are encountered.
Candidates should be able to:
(a) recall the energy gradation across the electromagnetic spectrum from u.v. to…

Page 7

Preview of page 7
If the number of protons and the number of neutrons are both even then the nucleus
has no overall
spin.
If the number of protons plus the number of neutrons is odd, then the nucleus has half
integer spin.
If the number of protons and the number of neutrons are…

Page 8

Preview of page 8

Page 9

Preview of page 9
2 In the absence of a magnetic field the spin energy levels are the same but in the
presence of a magnetic
field, the energy levels split.
The most common form of nmr is proton nmr. The H1
1

atom has a nuclear spin of 1/2 and such
hydrogen atoms…

Page 10

Preview of page 10

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No comments have yet been made