CCM2020Fall

Mention three instruments which can be used as both qualitative and quantitative analysis. (30 sec, 5 points)

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Which one is better? an instrument with high accuracy but low precision or the one with high precision but low accuracy. Explain your opinion. (2 min, 15 points)

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What is spectroscopy? (60 sec, 10 points)

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What is the purpose of AAS characterization? How about the limitation? (2 min, 10 points)

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There are several options of excitation source in AES, explain the comparation. (2 min, 10 points)

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The table shows the relationship between the absorbance of a solution and its concentration given a pathlength of 0.7 cm.

[a] What is the absorbance when the concentration is 0.8 M?

[b] What is the concentration if the absorbance is 0.605?

(3 min, 15 points)

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Identify each part of the scheme of spectrophotometer. (60 sec, 5 points)

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Which material is expected to absorb light with higher wavelength? Why? (3 min, 10 points)

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Why sometimes FTIR give a very broad peak? Where is it come from? (3 min, 10 points)

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Which molecule is the FTIR spectra belong to? Explain your argument. (3 min, 20 points)

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