The peaks in a UV-Visible spectrum are associated with which molecular changes?electronic statevibrational staterotational statetranslational state

In a UV-Visible spectrum, the peaks are associated with electronic state changes within molecules.…

Answered: The peaks in a UV-Visible spectrum are…

Principles of Modern Chemistry

8th Edition

ISBN:9781305079113

Author:David W. Oxtoby, H. Pat Gillis, Laurie J. Butler

Publisher:David W. Oxtoby, H. Pat Gillis, Laurie J. Butler

Chapter20: Molecular Spectroscopy And Photochemistry

Section: Chapter Questions

Problem 51AP

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Which molecules below are rotational Raman active and which are inactive. O3 CH4 NH3 H2 H2O SiH4 CF6 C4H10
state which of the following molecules show a pure rational microwave absorption spectrum and explain why (a) H2O (b) CO2 (c) NH3 (d) N2O (e) Benzene (f) Cl2
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Beta-carotene is an organic compound with an orange color. The diagram above shows the ultraviolet spectrum of beta-carotene. Which of the following statements is true about the absorption bands in the spectrum?(see attached image) a.) The absorption band between 250250 and 320 nm320 ⁢⁢nm is due to transitions in electronic energy levels, and the absorption band between 380 and 520 nm is due to transitions in molecular vibrational levels. b.) The absorption band between 250 and 320 nm is due to transitions in molecular vibrational levels, and the absorption band between 380 and 520 nm is due to transitions in molecular rotational levels. c.) The two main absorption bands are associated with transitions in electronic energy levels. The band in the region corresponding to shorter wavelengths shows a lower absorbance than the band in the region corresponding to longer wavelengths. d.) The two main absorption bands are associated with transitions in molecular vibrational levels.…
All of the following are reasons electronic spectra of molecules typically contain broad peaks EXCEPT There are rotational states present (in addition to electronic transitions) There are many states of similar energy for each transition There are vibrational states present (in addition to electronic transitions) All electronic transitions are forbidden and thus have long lifetimes
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All of the following are TRUE about molecular fluorescence spectroscopy, except: A. the sensitivity is one to three orders of magnitude better than absorption spectroscopy. B. the radiant power of fluorescence is proportional to the radiant power of the excitation beam absorbed. C. small linear concentration range. D. the absorption spectrum and the fluorescence spectrum for a compound often appears as approximate mirror images.

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The peaks in a UV-Visible spectrum are associated with which molecular changes? electronic state vibrational state rotational state translational state