VII. (10 points) Match each of the instrumental techniques with its proper descr

Question

VII. (10 points) Match each of the instrumental techniques with its proper description. **Note** Techniques may match more than one description (1) Mass Spectrometry (2) NMR Spectroscopy (3) IR Spectroscopy (4) Gas Chromatography (a) Molecules absorb energy that makes their bonds vibrate (stretch and bend), the absorbance is measured. (b) Molecules absorb low energy radiation and their protons are flipped upside down. (c) Molecules are dismembered into cations and free radicals. (d) A mixture of substances/molecules is separated using a stationary phase and a liquid mobile phase. (e) This method only sees carbon and hydrogen atoms.

Explanation / Answer

Hi, the answers should be:

3-a, typically the IR spectrometry will make vibrate and will reac the absorbance of each of them

2-b We are talking about protons, and makes sense to inlcude nuclear magnetic resonance!

1-c Typically, the species must be ionized

4-d This technique uses liquid phases vs. gas phase !

1-e Mass spectrometry has this limitation as well

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