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Listening Quiz: Giải Thích Phổ NMR – Advanced Level
Th1 22, 2024
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bởi
Anna Phạm
trong
Tiếng Anh Hóa Học (English for Chemistry)
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1.
What is the main topic of the conversation?
How to identify only aromatic compounds in a sample
How to calculate the mass of a chemical sample
How to use an NMR spectrum to interpret hydrogen environments
How to prepare an NMR instrument for use
Explanation:
Jessica and Paul discuss how to interpret an NMR spectrum, including chemical shifts, integration, and splitting patterns to identify hydrogen environments.
2.
What does Jessica say chemical shifts show?
How many peaks appear in a sample
The exact mass of each hydrogen atom
How close hydrogens are to electronegative atoms
Whether a compound is liquid or solid
Explanation:
Jessica explains that chemical shifts show how close hydrogens are to electronegative atoms.
3.
According to Jessica, what does a peak at 7 ppm usually mean?
Aromatic hydrogens
Two neighboring hydrogens
Alkyl hydrogens
A higher integration value
Explanation:
Jessica says that a peak at 7 ppm usually means aromatic hydrogens.
4.
How can Paul tell how many hydrogens are in each peak?
By measuring the distance between samples
By looking at the peak area or integration value
By checking the color of the spectrum
By counting the number of peaks in the whole spectrum
Explanation:
Jessica tells Paul to look at the peak area or integration value, which shows the relative number of hydrogens.
5.
What can be inferred about the triplet peak Paul mentions?
It indicates the sample contains only one hydrogen
It must represent aromatic hydrogens
It has no neighboring hydrogens
It is caused by two neighboring hydrogens
Explanation:
Jessica explains that splitting shows how many neighboring hydrogens there are, and she says a triplet means two neighboring hydrogens cause the splitting.
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