Lesson 3.3.6.2
3.3.6.2 Mass spectrometry Quiz: AQA Chemistry, Unit 3
20 questions
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Lesson 3.3.6.2, Mass spectrometry: 20 multiple choice questions for the AQA Chemistry (7405), Unit 3: Organic chemistry, written with Revision Ninja.
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The 20 questions
-
What does the molecular ion peak in a mass spectrum indicate?
- Bond vibration frequency
- Empirical formula
- Number of fragments
- Relative molecular mass
-
What process forms a molecular ion in electron impact mass spectrometry?
- Gain of a proton
- Homolytic fission
- Loss of an electron
- Heterolytic fission
-
What can be determined using precise atomic masses in high-resolution mass spectrometry?
- Empirical formula
- Optical purity
- Molecular formula
- Functional groups
-
Which molecular formula has a precise molecular mass of 44.0261?
- N2O
- CO2
- C3H8
- C2H4O
-
A compound has a precise molecular ion mass of 58.0417. Which molecular formula fits?
- C3H6O
- C2H6N2
- C4H10
- C2H2O2
-
A compound has a precise molecular ion mass of 60.0573. Which molecular formula fits?
- C4H12
- C2H4O2
- C3H8O
- CH4N2O
-
Compound X has a precise molecular ion mass of 88.0522. Which molecular formula is correct?
- C4H8O2
- C3H8N2O
- C3H4O3
- C5H12O
-
A compound has a precise molecular ion mass of 46.0417. Which molecular formula fits?
- CH4NO
- C2H6O
- CH2O2
- C3H10
-
A compound has a precise molecular ion mass of 74.0729. Which molecular formula fits?
- C3H10N2
- C4H10O
- C2H6N2O
- C3H6O2
-
A compound has a precise molecular ion mass of 102.0678. Which molecular formula fits?
- C5H10O2
- C4H10N2O
- C6H14O
- C4H6O3
-
What type of mass spectrometry distinguishes between compounds with the same nominal mass?
- Infrared spectroscopy
- Chromatography
- High resolution
- Low resolution
-
What process causes a molecular ion peak to be weak or absent in a mass spectrum?
- Fragmentation
- Polymerisation
- Protonation
- Ionisation
-
A compound contains only carbon, hydrogen and nitrogen, and its precise molecular ion mass is 58.0530. Which formula fits?
- C3H6O
- C2H2O2
- C4H10
- C2H6N2
-
What is the degree of unsaturation for C4H8O2?
- 0
- 2
- 1
- 3
-
Which technique distinguishes between molecules with the same nominal mass of 44?
- Flame photometry
- High-resolution mass spectrometry
- Low-resolution mass spectrometry
- Thin-layer chromatography
-
What value from high-resolution mass spectrometry is used to find an exact molecular formula?
- Peak intensity
- Retention time
- Wavenumber
- Precise molecular mass
-
A compound has precise molecular ion mass 74.0366. Which molecular formula fits?
- C3H6O2
- C3H10N2
- C2H6N2O
- C4H10O
-
What can be determined directly using precise atomic masses from high-resolution mass spectrometry?
- Relative abundance
- Molecular formula
- Bond lengths
- Empirical formula
-
What is the degree of unsaturation for a molecule with formula C5H10O2?
- 1
- 0
- 2
- 3
-
High-resolution mass spectrometry is primarily used to determine which molecular property?
- Molecular formula
- Bond angle
- Molecular shape
- Empirical formula
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