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 32P

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I have filled out the table with what I viewed on the simulator. I just need to know why they occur. Thanks!
Match the region of the electromanetic spectrum with the type of chemical spectroscopy. Nuclear magnetic resonance (NMR) - electron and proton resonance Options: X-rays Microwaves Infared Radio waves Ultraviolet and visible light Raman spectroscopy-molecular rotations options: X-rays Microwaves Infared Radio waves Ultraviolet and visible light Electron excitation (energy level changes) Options: X-rays Microwaves Infared Radio waves Ultraviolet and visible light IR spectroscopy - molecular vibrations Options: X-rays Microwaves Infared Radio waves Ultraviolet and visible light Ionization Options: X-rays Microwaves Infared Radio waves Ultraviolet and visible light
In comparing fluorescence spectroscopy to UV-Vis absorption spectroscopy, which of the statements is true? Fluorescence measurements are more precise and less noisy because only the intensity of the emitted light is measured. Fluorescence measurements do not suffer deviations from linearity like absorbance measurements do. Fluorescence measurements have better detection limits because at low concentrations a low intensity emission signal is being measured against a low intensity background signal. O Fluorescence instruments are less expensive than absorption measurements.
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This question pertains to the heteronuclear diatomic 1H19 Given that the bond length of 1H19F is 0.91 angstrom (1 angstrom = 10-10m), calculate the moment of inertia. Calculate the rotational constant (in J) for the diatomic in part a. Using your value for the rotational constant in part b, determine the energy of the transition from state 3 to state 4 (in J). Do you expect the energy of the transition from state 3 to state 4 for 2H19F to be larger or smaller than what you computed in part c, assuming that the bond length does not change? Explain your choice based on the relevant equations, or calculate the energy for this transition. Steps 1, 2 and 3 have already been found. I need help with the last question only but I haven't been able to get it solved since there can only be three questions answered. The following answers for step 1-3 are below. 1. moment of inertia = 1.30 × 10-47 kgm2 2. rotational constant = 21.5 cm-1 3. Energy required from transition n= 3 to n= 4 is…
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3. Four possible vibrational modes for a trigonal planar BF3 molecule are shown below. (The arrows represent motions within the plane of the paper, and the + and - signs represent motions in and out of that plane.) Mode 1 Mode 2 Mode 1 Mode 3 Determine which of those modes should be IR-active, and then circle your choices below. Mode 2 Mode 4 Mode 3 Mode 4
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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