Principles of Instrumental Analysis, 6th Edition
6th Edition
ISBN: 9788131525579
Author: Douglas A. Skoog, F. James Holler, Stanley R. Crouch
Publisher: Cenage Learning
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Question
Chapter 16, Problem 16.7QAP
Interpretation Introduction
Interpretation:
The number of vibrational modes and IR absorption bands of sulfur dioxide molecule should be determined.
Concept introduction:
When the atom of a molecule moves, there is translation and rotation in the molecule. The uncertainty principle of Heisenberg states that the atoms of the molecule are in the continuous motion. The modes of vibrations may be IR or Raman active.
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Which of the following statements is FALSE?
a.) The absorptions in IR are attributed to transitions between rotational energy levels of the molecules.
b.) The UV spectrum provides information about the valence electrons.
c.) UV absorptions are attributed to electronic transitions.
d.) NMR spectrometers use radio frequency energy
Rank the following bonds in terms of their expected vibrational frequencies
F-H, C-H, O-H, N-H
Question 11
Which of the following statements is NOT true about Fermi Resonance?
O t results from coupling of a fundamental vibration with an overtones
causes a spilt and shift in intensity of peaks with similar energies
used to help explain and assign peaks in vibrational spectra that which correspond to specific fundamental vibrations
Shifting of the energies and intensities of absorption bands in an infrared
Chapter 16 Solutions
Principles of Instrumental Analysis, 6th Edition
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- 5. In an IR spectrum, the x axis represents wavenumber of the light being absorbed by bond vibrations. The wavenumber is (B) directly proportional to the frequency. (A) directly proportional to the wavelength. (C) inversely proportional to the energy of the wave. (D) None of the above.arrow_forwardIndicate whether each statement is true or false. The larger the number of atoms in a molecule, the more degrees of freedom of rotational and vibrational motion it likely has.arrow_forward1. How does the number of carbon atoms affect the degree of luminosity of the flame produced?arrow_forward
- What is the meaning of the term wavenumber, which is used in IR spectroscopy? OIt is the total number of wavelengths of IR radiation absorbed by the compound. It is the number of waves that pass through a particular point each second. It is another term for the energy of radiation. OIt is how many waves the IR light contains.arrow_forwardThe infrared spectrum shown below corresponds to a compound with molecular formula C4H8O2. Which of these five molecules is it most likely to be?arrow_forwardHow can Bond breaking be quantified ?arrow_forward
- The highest occupied molecular orbital of a molecule isabbreviated as the HOMO. The lowest unoccupied molecularorbital in a molecule is called the LUMO. Experimentally,one can measure the difference in energy betweenthe HOMO and LUMO by taking the electronic absorption(UV-visible) spectrum of the molecule. Peaks in theelectronic absorption spectrum can be labeled as p2p9p2p*,s2s9s2s*, and so on, corresponding to electrons being promotedfrom one orbital to another. The HOMO-LUMO transitioncorresponds to molecules going from their groundstate to their first excited state. (a) Write out the molecularorbital valence electron configurations for the ground stateand first excited state for N2. (b) Is N2 paramagnetic or diamagneticin its first excited state? (c) The electronic absorptionspectrum of the N2 molecule has the lowest energypeak at 170 nm. To what orbital transition does this correspond?(d) Calculate the energy of the HOMO-LUMO transitionin part (a) in terms of kJ/mol. (e) Is the…arrow_forward3. Relative Atomic Sizes. Rank the following in increasing order of atomic size (atomic radius) by numbering them in order from 1 through 6, with 1 being the smallest and 6 being the largest. Se Cr K Br Са Krarrow_forwardDetermine the number of canonical or resonant forms of 1,2-diphenylethylene, the trans isomer of which is shown in images. Explain the order of stability of canonical forms. (canonical or resonant forms are not cis / trans forms)arrow_forward
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