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Listening Quiz: Thuyết Trình Dữ Liệu Quang Phổ Để Xác Định Hợp Chất – Easy Level
Th9 7, 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?
Comparing different carbonyl compounds
Analyzing spectroscopic data to identify a compound
Discussing how to operate an NMR machine
Planning a chemistry experiment
Explanation:
Linda and Paul discuss infrared, NMR, and mass spectrometry results to determine that the compound is formaldehyde.
2.
What does the infrared spectrum show?
A molecular ion at 44
A strong peak at 1700 cm^-1
A singlet at 9.8 ppm
A peak at 1700 ppm
Explanation:
Linda says the infrared spectrum shows a strong peak at 1700 cm^-1.
3.
What is the singlet at 9.8 ppm typical of?
An aldehyde proton
A carboxylic acid proton
A ketone proton
An alcohol proton
Explanation:
Linda explains that the singlet at 9.8 ppm is typical for an aldehyde proton.
4.
What compound do the data most likely identify?
Formaldehyde
Methanol
Ethanol
Acetone
Explanation:
Linda states that all of the data points to formaldehyde, and Paul agrees that the mass fits its molecular weight.
5.
Why does Paul say, ‘Good work. The evidence is clear.’?
He wants Linda to repeat the test results
He is suggesting the compound is not formaldehyde
He is asking for more information about the NMR data
He is confirming that the data supports the identification
Explanation:
Paul says this after Linda explains that all the data points to formaldehyde, so he is confirming that the evidence supports the conclusion.
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