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Listening Quiz: Lựa Chọn Chất Chuẩn Tham Chiếu Phù Hợp – Medium Level
Th5 19, 2024
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bởi
Anna Phạm
trong
Tiếng Anh Hóa Học (English for Chemistry)
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1.
What is the conversation mainly about?
Why chromatography is better than spectroscopy
How to choose and use a reference standard in testing
How to replace an analyte with any available chemical
How to prepare samples for a laboratory experiment
Explanation:
Kevin and Anna discuss what a reference standard is, what qualities it must have, how to choose one, and how it is used in calibration.
2.
According to Kevin, what must a reference standard be like?
Mixed with several similar compounds
Exactly the same as the sample
Highly pure and stable
Cheap and easy to find
Explanation:
Kevin says the reference standard must be ‘highly pure and stable.’
3.
What should they do if the analyte is not available?
Wait until the analyte is found
Use a similar compound as a substitute
Use any chemical in the lab
Skip the test entirely
Explanation:
Kevin explains that if the analyte is not available, they use a similar compound as a substitute.
4.
How do they check the purity of the standard?
By adding it to the calibration machine
By comparing it to another sample visually
By heating it to a high temperature
By using chromatography or spectroscopy
Explanation:
Kevin says they use techniques like chromatography or spectroscopy to check purity.
5.
Why does Kevin say the reference standard helps make the test accurate?
Because it can replace any analyte in any test
Because it is easy to prepare quickly
Because it is used as a tool for calibration
Because it is always the same as the sample
Explanation:
Kevin directly says the reference standard is used for calibration, and that helps make the test accurate.
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