General Anesthetics Please circle the best answer for each of the following ques

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General Anesthetics Please circle the best answer for each of the following questions I. To analyze a complete G/MS data set, one needs to examine a the TIC of each part of the mass b the mass spectra of each part of a TIC spectrum d the TIC 2. How many peaks do you expect to see in a GC/MS TIC if you inject 1.0 u.L of a sample made up a. more of 2% propunal and 98% methanol? than 2 , b. 2 d. 0 3. If Compound U shows the same retention time as carbon tetrachloride under identical 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 GCMS TIC will correspond to: a. the background (noise). b. the most abundant compound in the mixture injected. e. the compound I care about in the mixture injected. 5 The "Scan Rate" of a GC/MS instrument determines: 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: a. 110 eV b. 30 eV d. 70 eV c. 0 eV 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 GCs. d. mass analysis of ionized molecules and their fragments. 8. What does the GC in GC/MS stand for? a. gas column b. gas chromatography d. gel capillary c. guided capillary 9. 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 spectrumm 10. 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. c. an analysis of the mass spectrum. d. actually, GC/MS only provides information about identity and not about purity VMSL

Explanation / Answer

1 (a) TlC of the each part of the mass spectrum

2(a) more than two

3 (d) is carbon tetrachlore, only if the mass spectrum fragments agrees

4 (b) most abundant compound in the mixture injected

5 (b) time taken to collect the mass spectrum

6 (d) 70eV

7(d) the mass analysis of ionized molecules and their fragments

8. (b) gas chromatography

9. (b) intensity of the plotted vs m/z in the mass spectrum

10. (c) an analysis of mass spectrum

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