Refer to the following figure when answering the questions 21 and 22 below: Rel. Chem. shift area 1.22 1.50 3.49 1.00 TMS 10 8. 7 6 4. 3 1 0 ppm Chemical shift (8) 21. The peaks in the above spectrum are generated by: a. Movement of molecular ions through a magnetic field b.Absorbance by electrons c. Vibration of bonds in molecules d.Spinning of hydrogen molecules in molecules e. Spinning of carbon atoms in molecules Intensity

Refer to the following figure when answering the questions 21 and 22 below: Rel. Chem. shift area 1.22 1.50 3.49 1.00 TMS 10 8. 7 6 4. 3 1 0 ppm Chemical shift (8) 21. The peaks in the above spectrum are generated by: a. Movement of molecular ions through a magnetic field b.Absorbance by electrons c. Vibration of bonds in molecules d.Spinning of hydrogen molecules in molecules e. Spinning of carbon atoms in molecules Intensity

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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Which of the the following is false regarding spectrophotometry? A. The concentration of a sample increaes with the path length of the curvette or sample holder since the absorbance increases B. When absorbance increases, transmittance decreases C. The absorption coefficient depends on wavelength of light and type of sample D. Materials with higher absorption coefficients more readily absorb light. E. The lambda max of a red sample is at a shorter wavelength than the lambda max of a blue sample
What would be the multiplicity associated with # 1, 2 & 3? Hint: Remember to think about chemically equivalent protons. a. q b. t c. d d. s
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.
Refer to the following figure when answering the questions 23 and 24 below: 200 180 160 140 120 100 80 60 40 20 0 ppm Chemical shift (8) 23. This type of spectrum is generated by: a. Movement of molecular ions through a magnetic field b.Absorbance by electrons c. Vibration of bonds in molecules d.Spinning of hydrogen molecules in molecules e. Spinning of carbon atoms in molecules 24. This type of spectral analysis is used for: a. Determining molecular mass b.Determining functional groups present in the molecule c. Determining the empirical formula d.Determining the relative positions of hydrogens in the molecule e. Determining the relative positions of carbons in the molecule Intensity
Sample #1 has an absorbance of 0.300. Sample #2 is the same substance and has an absorbance of 0.600 using the same equipment. What is the relative concentration of the second sample? Select one: a. The concentration of sample #2 is the square root of that of #1. b. The concentration of sample #2 is that of sample #1 squared. c. The concentration of sample #2 is half that of sample #1. d. The concentration of sample #2 is twice that of sample #1.
Use the image to answer the following questions 1. 1 3 These two regions are composed of CT. 2 2 and 3 This is stratum spinosum. 3. 1and 4 This indicates a region that 4. 3 produces fingerprints 5, 4
Which of the following is true of surface enhanced Raman spectroscopy? a. It is produced by adding colloidal metal particles to a solution b. It requires a solid sample c. It requires adsorption on a dielectric surface d. It requires absorption by a resonant transition
Q7. Which compound most likely gives rise to the spectrum below? a. 0.8 b. 0.6 0.4 C. of 0.2- 2000 3000 Wavenumber (cm-1) 4000 1000 Chemistry WebBook (http://webbook.nist.govichemistry) d.
Which of the following statements concerning spectroscopy is correct? A) Concentration of a solution is directly proportional to the % of photons transmitted. B) Salt plates are often used in IR spectroscopic measurements because they are transparent in that region. C) Molar absorptivity is a constant for given species, regardless of concentration or wavelength. D) Fluorescence excitation is usually red-shifted from emission wavelength. E) 2 or more statements are correct. The absorbed energy to enable vibrational level transition falls within which wavelength range A) radio wave B) microwave C) IR D) X-ray E) UV and visible
2. You have two solutions of the same compound that are blue. One is very pale and the other is very intense. Absorbance of each solution was measured with a spectrophotometer at the same wavelength at which the solution absorbs. a) Which solution has the higher absorbance? b) Which is the more concentrated solution?
The spectrum below is the visible absorption spectrum of a dye. Based on the highest absorbance, what is the actual color of the solid dye? max = 630 nm Absorbance Select one: a. Green b. Red c. Orange Check 1.4 1.2 1 0.8 0.6 0.4 0.2 0 I I I 480 520 SOⓇ 560 SO 600 Wavelength (nm) 640 680 720
A. dependent variable independent variable B) Graph B C) Graph C D) Graph D E) Graph E D. In 700 wavelength (nm) 400 B. of 700 400 wavelength E. Which graph above best illustrates the relationship between the concentration of a substance and the height of its absorbance peak? A) Graph A C. time time