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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?
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
Why chromatography is better than spectroscopy
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?
Skip the test entirely
Use any chemical in the lab
Wait until the analyte is found
Use a similar compound as a substitute
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 comparing it to another sample visually
By using chromatography or spectroscopy
By adding it to the calibration machine
By heating it to a high temperature
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 is used as a tool for calibration
Because it is easy to prepare quickly
Because it is always the same as the sample
Because it can replace any analyte in any test
Explanation:
Kevin directly says the reference standard is used for calibration, and that helps make the test accurate.
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