1.- Is the energy absorption associated with \"bands\"in aninfrared spectrum of

Question

1.- Is the energy absorption associated with "bands"in aninfrared spectrum of higher or lower energy than the "lines"appearing in a visible line spectrum? Explain. 2.- Identify the type of energy transition ocurring in amolecule that causes a band to appear in an infraredspectrum? 3.-  Identify the type of energy transition ocurringin an atom that causes a line to appear in a visibleline spectrum? 1.- Is the energy absorption associated with "bands"in aninfrared spectrum of higher or lower energy than the "lines"appearing in a visible line spectrum? Explain. 2.- Identify the type of energy transition ocurring in amolecule that causes a band to appear in an infraredspectrum? 3.-  Identify the type of energy transition ocurringin an atom that causes a line to appear in a visibleline spectrum?

Explanation / Answer

1) lower. Infrared has longer wavelength (lower frequency, recall E =h*frequency) than visible 2) vibration (think C=O bond vibrations), stretching the C=Obond 3) electronic excitations; promoting electrons to higher atomicorbitals, since this requires more energy than vibrations

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