A2 Structure Determination Quiz

Just a quiz that tests understanding of Topic 11 of A2 Chemistry, including: Mass Spectrometry, Infra-red Spectroscopy, Proton nmr, Carbon-13 nmr and Chromatography :D

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  • Created by: Tooba
  • Created on: 15-01-12 20:46
How are fragments produced?
1 bond breaks = a positive ion and a free radical
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The best way to measure Molecular Mass is...
Mass spectrometry
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What is the stability of carbocations?
1y < 2y < 3y
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How does a carbonyl compound typically fragment?
Alkyl radical + Acylium ion
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Can peaks produced by Carbon-13 atoms be seen on mass spectra?
False
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Why is the O-H vibration very large?
Hydrogen bonding
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What is it called when nuclei 'flip' between parallel and anti-parallel states?
Resonance
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The greater the electron density around a carbon atom, the:
lower the frequency
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What does TMS stand for?
Tetramethylsilane
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Oxygen causes a higher resonating frequency because:
it pulls electrons from the carbon
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In both Carbon-13 and Proton n.m.r, each peak is for a different:
environment
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How do you find the ratio of hydrogen atoms from an integration trace?
Divide by the smallest value
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What does spin-spin coupling/splitting form?
Singlets, Doublets, Triplets and Quartets
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Is it possible to predict Proton n.m.r spectra for substances that haven't been made yet?
True
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Chromatography involves two stages called:
Mobile and Stationary
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Three types of chromatography are:
Paper, Gas-Liquid and Column
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If a component has a greater affinity for the stationary phase, it moves:
more slowly with the mobile phase
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Separation in GC depends on the balance between:
solubility in mobile and retention in stationary
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How is a component identified?
The retention time is compared to a known substance
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Other cards in this set

Card 2

Front

The best way to measure Molecular Mass is...

Back

Mass spectrometry

Card 3

Front

What is the stability of carbocations?

Back

Preview of the front of card 3

Card 4

Front

How does a carbonyl compound typically fragment?

Back

Preview of the front of card 4

Card 5

Front

Can peaks produced by Carbon-13 atoms be seen on mass spectra?

Back

Preview of the front of card 5
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