.Answer the following questions giving as much detail of your reasoning as possible: 1. Why is important the population distribution in spectroscopy in general? Use the formula below to answer: Nupper/Niower e(-AE /kT) where k = 1.381 x 1023 J K1 Also include a simple scheme (or 3 schemes) that applies to lIR, UV-vis and NMR spectroscopy

.Answer the following questions giving as much detail of your reasoning as possible: 1. Why is important the population distribution in spectroscopy in general? Use the formula below to answer: Nupper/Niower e(-AE /kT) where k = 1.381 x 1023 J K1 Also include a simple scheme (or 3 schemes) that applies to lIR, UV-vis and NMR spectroscopy

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

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Please refer to the images as much as you need to. For the following hydrocarbons, pick out 5 wavenumbers for each hydrocarbon, and give it its probable assignment for its structure. You may find this link useful: https://www.sigmaaldrich.com/US/en/technical-documents/technical-article/analytical-chemistry/photometry-and-reflectometry/ir-spectrum-table o-xylene (cm-1) : 985.76, 1021.06, 1052.51, 1119.30, 1383.43, 1465.62, 1495.11, 1604.66, 2859.82, 2874.76, 2922.19, 2937.08, 2968.08, 3016.57, 3049.67, 3063.02, 3105.51 m-xylene (cm-1) : 876.16, 904.28, 1039.26, 1094.05, 1169.56, 1376.70, 1397.17, 1458.12, 1491.51, 1538.93, 1557.96, 1591.83, 1612.18, 1652.69, 2730.72, 2863.59, 2920.44, 2944.72, 3015.77, 3104.24 p-xylene (cm-1) :1023.01, 1042.16, 1102.92, 1119.19, 1219.51, 1378.51, 1455.91, 1515.82, 1557.92, 1631.57, 1889.80, 2732.29, 2868.22, 2921.93, 2976.07, 2999.25, 3018.79, 3044.59, 3093.20, 3133.55, 3134.26
5. Predict the ESR spectrum of pentafluorooxovanadium(IV), VOF, . For v, I=7/2 with explanation. 6. Show how an ESR spectrum having three lines could arise by (a) hyperfine coupling to two nuclei with spin I= ½ and (b) hyperfine coupling to a nuclear spin 1. How can these two possibilities be distinguished?
2 PPM Calculate the coupling constant (J) for the multiplets reported in the 'H-NMR expansion above, knowing that the corresponding spectrum was recorded at 400 MHz. Report your result with four significant figures. 2.444 2.410 2.376 2.342 2.005 1 1.244 1.210 1.176 3.012
5.
Draw a picture and determine the point group for EACH of the possible structural arrangements of PFnBr(5-n) for n = 0 to 5. I.e. start with PBr5 and end with PF5. Assuming a static structure, indicate the number and relative intensities of the signals that you would expect to see in the 19F NMR spectrum of each molecule. %3D
Q.1.A Q.1.B
Review your IR knowledge from the CHEM 326L and (or) the recommended textbook sections. How would you use IR-spectroscopy to prove the presence of a C=C bond in a compound where the C=C stretching vibration does not show up because of symmetry?
2. READ THE DIRECTIONS TO EACH QUESTION CAREFULLY - not following the directions means you get the question wrong! 3. FORMAT YOUR ANSWERS AS DIRECTED - formatting your answers incorrect means you get the question wrong! 4. Below are the IR regions and NMR chemical shifts table for use with the spectroscopy problems: ¹H NMR 12 R 11 10 OH R D H 9 8 7 H ppm 6 C=C-H OH 5 NH H-C-X H-C-O -OH X = F, Cl, Br (i.e. electronegative atom) 3 -NH 2 H-C-N H-C-S CC-H H-C-C=C 1 H-C-C=O-CH HC-0 -CH3 -CH₂- 0 4000 DIO small range range of values broad peak =C-H N-H 3250- 3300 broad with spikes -3300 3500 -O-H broad-3300 -3400 -O-H -CIN N-H CO H =C ㅏ 2730- 2820 H 3000- 2 peaks 3100 C-H H 2850- 2960 O -C-O-H broad-3000 3000 usually strong -CEN 2500 wavenumber, cm-¹ 2200 <-CICH B 2200 2000 H 0 C 0:0 C. ပြီး 1680 1730 O OR 1710 1600- 1660 18%0.058 N 1650 viz NR₂ 1600 1500 D 1000
4b. Which of the following molecules (A and B) matches the IR spectra below. Explain your choice.
14.88. Silane, SiH, has a tetrahedral geometry and a rovi- brational spectrum consisting of lines spaced by 5.92 cm. Calculate the Si-H bond distance in silane. Could this infor- mation be obtained by pure rotational spectroscopy? Why or why not?
Identify as many peaks as possible. This is the IR Spectroscopy of an unknown solid in Nujol.
Interpret/Analyze the given IR spectra. Benzocaine exp