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- Assign each mass spectrum to the molecule on the list. Write down the molecule that corresponds to the main fragments. 1. 60 80 100 0 20 80 m/z B. Jadi 71 100 0 20 00 10 40 miz m/z D. MY. -Taut A. C. 8 2Why is mass spectrometry called so, not as spectrometry?In mass spectrometry, the molecular ion peak occurs at O A. the largest m/z value. O B. the smallest m/z value. O C. the m/z value of the most abundant ion. O D. an m/z value equal to the molecular weight of the sample molecule.
- The mass spectrum of a compoun is shown below. Which of the following is this compound? A. CyclopropanolB. Trimethylene oxideC. ButaneD. AcetoneE. Propen-2-ol1. Which one of the given compounds is consistent with the mass spectrum below? 100 40 20 10 20 25 30 35 40 5o 55 45 60 65 70 75 m/z Courtesy of SDBS: National Institute of Advanced Industrial Science and Technology A. CH,CH,CH(CH,), В. CH,CHOHCH,CH, C. CH,CH,OCH,CH, D. CH,CH,NHCH,CH, E. CH,CH,CH,CH, Relative htensity1. What is the molecular ion peak in a mass spec represent? 2. What is the base peak in the mass spec? 3. In the space below differentiate between a mass spec of a compound with one chlorine and a compound with one bromine. Chlorine Bromine
- Before inserting the cuvette into the spectrometer, make sure the cuvette is wiped clean with a ChemWipe, then insert the cuvette into the sample holder with the light path going through O a. the ribbed sides (left and right) and with the clear sides at the top and bottom. O b. the clear sides (left and right) and with the ribbed sides at the top and bottom. O C. the clear sides (top and bottom) and with the ribbed sides at the left and right. O d. the ribbed sides (left and right) and with the clear sides at the top and bottom.explain: 1. Steps for using a mass spectrometry instrument 2. Steps to read the mass spectrometry spectrumBefore inserting the cuvette into the spectrometer, make sure the cuvette is wiped clean with a ChemWipe, then insert the cuvette into the sample holder with the light path going through O a. the ribbed sides (left and right) and with the clear sides at the top and bottom. O b. the clear sides (left and right) and with the ribbed sides at the top and bottom. O. the clear sides (top and bottom) and with the ribbed sides at the left and right. O d. the ribbed sides (left and right) and with the clear sides at the top and bottom.
- Choose suitable detector when you need identify the structure of unknown compounds or analyte. a. Ultraviolet-Visible light O b. Mass spectrometer O c. Conductivity O d. Answer b and cWhat is a characteristic feature of halogens on the mass spectrometry spectra? A. They have abundant isotopic peaks B. They have m/z values less than 100 C. They do not show up on mass spectrometry D. They possess at least 10 peaks with equal intensity4. Halogenated compounds are particularly easy to identify by their mass spectra because chlorine and bromine occur naturally as mixtures of two abundant isotopes. Chlorine occurs as "CI (75.8%) and "CI (24.2%). Ignore the presence of "C isotopes. For the compound, C,H,Cl;: a) At what masses do the molecular ions occur? b)What are the percentages of cach molecular ion?