WORKSHEET ONE
Mass spectrometry
1.
State the main aim of mass spectrometry.
2.
Fill in the following boxes by choosing from the words below to show how a mass
spectrum is obtained.
Smaller ions
electrons
vaporised
positive ion
graph
Bombarded with
Pure compound
Detected and printed
Breaks down into
as a
3.
Molecule loses 1
electron to form a
Write an equation to show how a molecule, M, reacts to form a radical cation
(positive ion).
4.
Explain two uses or applications of mass spectrometry.
5.
What is the m/z value for the molecular ion produced by the loss of 1 electron from:
(a)
Methane:
(b)
Propanone:
(c)
Ethanol:
6.
Above is the mass spectrum for hexane C6H14.
(a)
List the peak number that relates to the:
Molecular ion peak:
Base peak:
(b)
State what the following peaks correspond to:
86
57
43
7.
A hydrocarbon that does not react with bromine water gave a molecular ion peak at
114 and a base peak at 85. Give formula for:
8.
(a)
The molecular ion peak:
(b)
The base peak:
A compound has an empirical formula C2H4O and a molecular ion peak at 132.
Write the molecular formula for the compound.