Lesson 7A.1
7A.1 Using mass spectrometer data Quiz: Pearson Edexcel Chemistry, Unit 7
20 questions
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Lesson 7A.1, Using mass spectrometer data: 20 multiple choice questions for the Pearson Edexcel Chemistry (9CH0), Unit 7: Modern Analytical Techniques I, written with Revision Ninja.
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The 20 questions
-
Which peak in a mass spectrum gives the relative molecular mass of an organic compound?
- Molecular ion peak
- Base peak
- Fragment peak
- M+1 peak
-
A compound shows a molecular ion peak at m/z = 58. What is its likely relative molecular mass?
- 57
- 58
- 29
- 116
-
Which fragment ion causes the m/z 43 peak in the mass spectrum of propanone?
- CH3CH2+
- CH3CO+
- CH3+
- C3H7+
-
An organic compound has a molecular ion peak at m/z 46. A major fragment appears at m/z 31. Which fragment is most consistent with an alcohol?
- C2H5+
- CH2OH+
- CH3+
- CHO+
-
Molecular ion peaks at m/z M and M+2 with equal heights indicate which element?
- Chlorine
- Fluorine
- Iodine
- Bromine
-
What relative molecular mass is indicated by a molecular ion peak at m/z 72 for a compound that is a pentane isomer?
- 58
- 86
- 72
- 144
-
Which fragment is most likely to have m/z 15 in the mass spectrum of an alkane?
- C3H7+
- C4H9+
- CH3+
- C2H5+
-
Which fragment appears at m/z 29 for an alkane such as butane?
- C4H9+
- C2H5+
- C3H7+
- CH3+
-
A compound has a molecular ion peak at m/z 88. What is its relative molecular mass?
- 88
- 73
- 15
- 103
-
In a mass spectrum, what does the base peak represent?
- Heaviest fragment ion
- Molecular ion peak
- Least abundant ion
- Most abundant ion
-
A compound contains one chlorine atom and has a molecular ion at m/z 64 and an M+2 peak at m/z 66. What is the approximate ratio of their heights?
- 2:1
- 1:1
- 3:1
- 1:3
-
Which ion is responsible for the peak at m/z 31 in the mass spectrum of methanol?
- CH3+
- CHO+
- CH2OH+
- OCH3-
-
What is the relative molecular mass of an alkene whose molecular ion peak appears at m/z 56?
- 42, as C3H6
- 112, as C8H16
- 28, as C2H4
- 56, as C4H8
-
What causes the M+2 peak to be approximately one-third the height of the molecular ion peak?
- Oxygen atom
- Chlorine atom
- Bromine atom
- Carbon isotope
-
Why might a compound show a very weak molecular ion peak in mass spectrometry?
- Molecule fragments easily
- Ionisation energy high
- Molecule is non-polar
- Sample concentration high
-
An M-15 peak in a mass spectrum represents the loss of which group?
- COOH
- OH
- CH3
- C2H5
-
Which radical is lost to produce an M-29 peak in the mass spectrum of a straight-chain alkane?
- Propyl group
- Ethyl group
- Methyl group
- Hydroxyl group
-
What is the expected m/z value of the molecular ion of chloroethane, C2H5Cl, for the 35Cl isotope?
- 64
- 66
- 65
- 29
-
What relative molecular mass is shown by the molecular ion peak of ethanoic acid, CH3COOH?
- 60
- 44
- 45
- 74
-
A compound shows peaks at m/z 72 and m/z 57. What mass was lost?
- 29
- 17
- 14
- 15
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