wavelelig 1. What is the equation relating frequency to the speed of light? the
ID: 1026221 • Letter: W
Question
wavelelig 1. What is the equation relating frequency to the speed of light? the energy of that light. 2. The greater the wavelength of light, the 3. What is the range(name) of electromagnetic spectrum responsible for stretching and bending of bonds? 4. What is the type of electromagnetic radiation used in NMR? 5. Relative to visible light is this type of radiation in question 4 higher or lower in energy? 6. What component of an element is being probed in NMR? 7. What is the purpose of the magnet in NMR? 8. What is the normal distance (in bonds) for coupling to occur in 'H NMR? 9, we do not see coupling between carbons in a NMR. Why 10. The Y axis of an IR spectrum is % transmission. What is the unit seen on the X axis IR spectra? Is this value frequency or wavelength? 11. In IR spectroscopy scissoring and wagging and bending of C-H bonds is more likely to be seen in the functional group region or the fingerprint region? 12. Look up the IR values for amide and ketone carbonyls on the provided data sheet. What do the differences of the amide C=O IR values relative to the ketone C-O values suggest? 13. When an organic molecule absorbs Ultraviolet light, what sort of transition happens? 14. Which is higher in energy Ultraviolet light or Visible light? 15. Circle the compound that has the greatest likelihood of absorbing visible light (in other words, it has color). 16. In mass spectrometry electrons bombard the sample (analyte) and form a 17. How are the fragments of the compound mass spectrum detected?Explanation / Answer
1. Relation between wavelength and frequency of light,
wavelength = speed of light/frequency
2. The greater the wavelength of light, the smaller the energy of light.
3. Range name for electromagnetic radiation = IR
4. radio waves
5. lower
6. magnetic property
7. generate magnetic field
8. normal bond distance is 3 bonds away.
9. natural abundance of 13C is very low and thus we do not see coupling of 13C nuclei,
10. x-axis = cm-1
11. True
12. amide have lower frequency than ketone carbonyl. that means nitrogen lone pair reduces the double bond character of C=O in amide by resonance which is not seen for ketones.
13. electronic transitions, pi-pi*, n-pi*, sigma-sigma*, n-sigma* occurs.
14.Ultraviolet light is higher in energy than visible light.
15. second compound on the right with more conjugation will absorb in visible region.
16. ions
17. using mass/charge ratio and abundance by detector response
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