A researcher is studying cytochrome oxidase, a protein that uses iron to bind diatomicoxygen. She collects two IR spectra, shown below. In the first spectrum, no isotopiclabeling is used (top). In the second, 160 has been replaced with 180 (bottom).8206557900.5-7146957338206557550.5-714695733600650700750800850V, (cm")Calculate the change in the ratio of reduced masses for this isotope shift.% Transmission

Reduced mass formula: μ=m1m2m1+m2 for 16O μ1=16×1616+16 = 8 amu…

A researcher is studying cytochrome oxidase, a protein that uses iron to bind diatomic oxygen. She collects two IR spectra, shown below. In the first spectrum, no isotopic labeling is used (top). In the second, 10 has been replaced with 180 (bottom). 655 790 820 0.5 714 695 733 655 755 820 0.5 714 695 733 0- 600 650 700 750 800 850 V, (cm") Calculate the change in the ratio of reduced masses for this isotope shift. % Transmission

A researcher is studying cytochrome oxidase, a protein that uses iron to bind diatomic oxygen. She collects two IR spectra, shown below. In the first spectrum, no isotopic labeling is used (top). In the second, 10 has been replaced with 180 (bottom). 655 790 820 0.5 714 695 733 655 755 820 0.5 714 695 733 0- 600 650 700 750 800 850 V, (cm") Calculate the change in the ratio of reduced masses for this isotope shift. % Transmission

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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QUESTION Bromine has two isotopes, 79Br and 81B.. To find out the isotopic abundance of each bromine isotope, a sample of Br, was injected to a mass spectrometer which subsequently released the spectra shown below. From each spectrum height was measured and tabulated. Explain why the peak height at the mass number 160 is twice as high as the peak height at the mass number 158 or 162. DATA Mass Number Peak height, cm 79 4.12 81 4.12 158 3.34 160 6.68 162 3.34 79 81 158 160 162 MASS, amu Relative Abundance
1.10 In which type of cryoEM is the sample tilted at ±70° relative to the direction of the incident electron beam in order to collect an image at each tilt angle and reconstruct the 3D image of the sample? O Single particle EM Transmission EM O Tomography
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.
Model 5: Isotope Natural Abundances Atom Most common isotope C O S N CI Br 12C (100) 160 (100) 32S (100) 14N (100) 35 CI (100) Jump in Mass Next most common isotope (no. extra neutrons) (no. found for every 100 atoms of most common isotope) +1 13C (1.11) 180 (0.20) 34S (4.40) 15N (0.38) 37 Cl (32.5) "¹Br (98.0) 79Br (100) For example: There are 1.11 *C atoms on the planet for every 100 ¹2C atoms. Equivalent ways of saying this are: There are likely to be 111 1³C atoms in a sample of 10,111 carbon atoms or 1.10% of the carbon on the planet is 1³C (since 111/10,111 x 100% = 1.10%). Critical Thinking Questions 15. What does the superscript to the left of each atom label tell you (e.g., the 12 in ¹2C)?
The mass spectrum of an unknown compound has a molecular ion peak with a relative intensity of 52.18% and an M+1 peak of 3.37%. How many carbon atoms are in the compound? (Fill in an integer number)
The mass spectrum of compound B, a colorless liquid, shows these peaks in its mass spectrum. Determine the molecular formula of compound B and propose a structural formula for it. Relative Abundance mlz 43 100 (base) 78 23.6 (M) 79 1.00 80 7.55 81 0.25
Identify the characteristic seen in the mass spectrum when there is a nitrogen in the compound. There are two molecular ions 2 units apart in a 3:1 ratio. The molecular ion has an even molecular mass. There are two molecular ions 2 units apart in a 1:1 ratio. The molecular ion has an odd molecular mass.
Q.1. Predict the relative intensity of the M, M+1, and M+2 peaks for a low resolution mass spectrum of a compound with molecular formula, C6H13Br. The natural abundances of the select isotopes are given below. 35 Cl: 75.8% 79Br: 50.5% 12C: 98.89% 37Cl: 24.2% (The ratio is almost 3:1) 81Br: 49.5% (The ratio is almost 1:1) 13C: 1.11%
Answer choices for blank 1: R S Answer choices for blank 2: R S Answer choices for blank 3: R S Answer choices for blank 4: R S
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?
2. Add the absorbance of your Part III solution to the graph. Llse the of best fit of your qraph to calcuate its line concentration. Concentraton vs Absorbance 1.6 con c: 0.003M 1.4 1.2 0.8 0.6 0.4 0.2 0.0005 0.001 0.0015 0.002 0.0025 0.003 0.0035 Concentration Co.003M) Concentration you have calculated in 2 is CCrO, of Ag CrO4. calculate your experimental ksp of Ag CrO4. = [Cr O4]? Use it to 2. %3D ksp of AgCr Oy = CAg+] [CrO4] Absorbance te Out
Match the molecular ion (from electron impact mass spectrometry) with the correct compound. (Make sure to consider the isotope pattern) 100 120 Br A 121 x B NH ន 122 Mass M/e 123 123 Me 124 124 OH но ма 125 D 126