General Anesthetics Please circle the best answer for each of the following ques
ID: 564343 • Letter: G
Question
General Anesthetics Please circle the best answer for each of the following questions. 1. To analyze a complete GC/MS data set, one needs to examine: a. the TIC of each part of the mass spectrum b. the mass spectra of each part of a TIC. c. the mass spectrum d. the TIC. 2. How many peaks do you expect to see in a GC/MS TIC if you inject 1.0 ul of a sample made up of 2% propanal and 98% methanol? a. more than 2 c. 1 b. 2 3. If Compound U shows the same retention time as carbon tetrachloride under identical GC/MS conditions, compound U a. is carbon tetrachloride. b. is either carbon tetrachloride or a fragment of carbon tetrachloride. c. must be reexamined under different GC/MS conditions. d. is carbon tetrachloride only if the mass spectrum fragmentation agrees 4. The most intense signal in a GC/MS TIC will correspond to: a. the background (noise). b. the most abundant compound in the mixture injected. c. the compound I care about in the mixture injected. air 5· The "Scan Rate" of a GCMS instrument determines a. the time it takes to scan the data set. b. the time it takes to collect a mass spectrum. c. the time it takes to collect a chromatogram d. the time one needs to allocate between successive injections. 6. The optimal electron ionization energy for a GC/MS experiment is: b. 30 eV d. 70 eV a. 110 eV c. 0eV 7. What does the MS component of a GC/MS provide? a. molecule separation ability b. mass standards for GC calibration. c. more sensitivity than available on traditional GC. d. mass analysis of ionized molecules and their fragments. What does the GC in GC/MS stand for? a. gas column c. guided capillary 8. b. gas chromatography d. gel capillary GC/MS data is considered two-dimensional because: a. each m/z in the mass spectrum corresponds to a retention time in the TIC b. intensity is plotted versus m/z in the mass spectrum. c. intensity is plotted versus time in the TIC d. each intensity in the TIC corresponds to a complete mass spectrum. 9. The purity of a sample injected into a GC/MS is determined by a. the number of peaks in the mass spectrum. b. the number of peaks in the TIC 10. c. an analysis of the mass spectrum. d. actually, GC/MS only provides information about identity and not about purity VMSLExplanation / Answer
ANSWER 1 : (b) option is correct.
Regarding the complete GC/MS data set all options are correct but all options are collectively explained in the (b) option i.e. THE MASS SPECTRA of each part of TIC.
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