Please view slides 4 - 10 to help you determine the correct answersto the follow

Question

Please view slides 4 - 10 to help you determine the correct answersto the following questions concerning IR spectroscopy (click here.)A) Which vibrational moderequires more energy? 1 bend
stretch


B) Which vibrational mode requires more energy? 2 out-of-plane bend
in-plane bend


C) The axis of the IR spectrum plots the % transmittance as afunction of the reciprocal centimeter. What is another term for"reciprocal centimeter"?
3

D) As the reciprocal centimeter value increases, the energy: 4 decreases
increases 1 bend
stretch
1 bend
stretch
1 2 out-of-plane bend
in-plane bend
2 out-of-plane bend
in-plane bend
2 4

Explanation / Answer

1. Stretch requires more energy. 2. In-plane bend requires more energy than out-plane bend,which requires about 800 reciprocal cm. 3. Wavenumer is another term for reciprocal centimeter. 4. Energy is directly proportional to the reciprocalcentimeter so the answer is increases. Hope this helps.

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