Questions

CH420 / CH620 Ceensic Chemistry
Part 2 Exam—Due Wednesday December 7, 2020
100 subject-matters practicable Name _________________
Multiple Choice. Select the BEST apology ce each inquiry (3 subject-matters each). Enter your apologys in
the Moodle Quiz.

  1. Headspace sampling takes custom of what pattern of bring-aboutweight?
    A. soft-soft bring-aboutweight
    B. soft-solid bring-aboutweight
    C. soft-vapor bring-aboutweight
    D. hypostatic bring-aboutweight
  2. Which of the cethcoming can pretend the correlativeness of an analyte ce a subject-matter air?
    A. contradiction
    B. polarity
    C. hydrogen-bonding interactions
    D. whole of these
  3. Which of the cethcoming is a equivalent-promise ce the promise hydrophilic?
    A. hydrophobic
    B. lipophilic
    C. hypsochromic
    D. lipophobic
  4. Which of the cethcoming can be used to use a screen bring-aboutweight?
    A. pH
    B. molecular concretion
    C. eruption subject-matter
    D. Duck® tape
  5. The structures of naproxen (pKa = 4.2) and codeine (pKa = 8.2) are absorbed adown. A soft-liquid
    nobility of a structure of naproxen sodium and codeine hydrochloride that would screen naproxen
    into the aqueous flake and codeine into the radical flake would claim an aqueous flake pH of
    A. 10.2
    B. 2.2
    C. 6.2
    D. 4.2
  6. Which of the cethcoming is referable attributable attributable attributable a necessary identification rule discussed in this dispose?
    A. Fourier-transfigure infrared spectroscopy
    B. aptamer styptic endeavor
    C. thin-flake chromatography
    D. spell of escape concretion spectrometry
  7. Which of the cethcoming is referable attributable attributable attributable an delectable confirmatory ordeal inferior SWGDRUG guidelines?
    A. Fourier transfigure infrared spectroscopy (FTIR)
    B. Enzyme-linked immunosorbent endeavor (ELISA)
    C. Concretion spectrometry (MS)
    D. Nuclear magnetic clang spectroscopy (NMR)
  8. Which of the cethcoming techniques is considered to be a non-destructive technique?
    A. Gas chromatography-concretion spectrometry (GC-MS)
    B. necessary falsification ordeals
    C. Fourier transfigure infrared spectroscopy (FTIR)
    D. Enzyme divers immunoendeavor technique (EMIT)
  9. Heroin is a basic refuse with a pKa of 7.95. At which pH conciliate heroin’s lipid solubility be principal?
    A. 9.95
    B. 7.95
    C. 7.0
    D. 5.95
  10. The collective equation representing EI concretion spectrometric ionization is best represented by?
    A. A+ + e- → A
    B. A + B+ → A+ + B
    C. E = mc2
    D. A + e-
    → A+ + 2e11. Which of the cethcoming discriminations can FTIR NOT bring-about?
    A. the salt cem versus the at-liberty vile cem of a basic refuse
    B. the R- versus the S- enantiomer of a refuse molecule
    C. the R,S- versus the S,S- diastereomers of a refuse molecule
    D. the bromide salt versus the citrate salt of a basic refuse
  11. Which of the cethcoming manacles has primary stretching number in the IR?
    A. C-C
    B. C=C
    C. C=O
    D. O-H
  12. Which of the cethcoming is NOT an custom of ATR balance transmittance ce FTIR sampling?
    A. manageable scantling preparation
    B. improved eminent to rattle reference (S/N)
    C. eliminates ion remodel drifts with salts of basic refuses
    D. diversity of items that can be scantlingd
  13. The concretion of an analyte is absorbed in the concretion spectrum by its
    A. vile peak.
    B. bae peak.
    C. composer ion peak.
    D. molecular ion peak.
  14. Ce an acidic combination, which of the cethcoming unconcealed nobility approaches is chasten?
    A. Decliningering the pH at smallest couple units adown the pKa conciliate give the combination hydrophilic.
    B. Decliningering the pH at smallest couple units adown the pKa conciliate give the combination lipophobic.
    C. Decliningering the pH at smallest couple units adown the pKa conciliate give the combination infiltrate discerptible.
    D. Decliningering the pH at smallest couple units adown the pKa conciliate give the combination radical discerptible.
  15. Which of the cethcoming is an main inducement when shrewd an acid-vile nobility
    protocol ce an amphoteric combination?
    A. the concretion to carry reference of the combination (m/z)
    B. the stretching number of the combination
    C. the contradiction of the combination
    D. the isoelectric subject-matter of the combination
  16. Which of the cethcoming instruments is most misspend ce confirmatory necessary radical
    analysis?
    A. Fourier transfigure infrared spectroscopy (FTIR)
    B. Atomic discharge spectroscopy (OES or AES)
    C. Atomic parching spectroscopy (AAS)
    D. Gas chromatography (GC)
  17. Which of the cethcoming instruments is most misspend ce disengagement and segregation of a structure
    of combinations in a biological matrix?
    A. High accomplishment soft chromatography (HPLC)
    B. Gas chromatography (GC)
    C. Fourier transfigure infrared spectroscopy (FTIR)
    D. Enzyme-linked immunosorbent endeavor (ELISA)
  18. Which of the cethcoming techniques employs the smallest active electromagnetic radiation?
    A. observable spectroscopy
    B. nigh infrared spectroscopy
    C. distant infrared spectroscopy
    D. ultraviolet spectroscopy
  19. A combination with a very declining Kow is best controlcible as being
    A. lipophilic
    B. hydrophobic
    C. driftatic
    D. hydrophilic
  20. A basic combination has a pKa of 0.3. Which of the cethcoming statements is penny?
    A. The combination conciliate be in its salt cem at a pH of 3.
    B. The combination is a very milk-and-soak vile.
    C. The combination is amphoteric.
    D. The combination canreferable attributable be extracted into infiltrate.
    A strange dispose of refuses that has befit a drift in newlightlight years is the synthetic cannabinoids, couple examples of
    which are named JWH-018 and JWH-250 (pictured adown), uniformly base in a result named “Spice.” Apology
    questions 22, 23, 24, and 25 encircling these couple combinations.
  21. Which of the cethcoming disagreements would you rely-on to watch betwixt the FTIR spectra of
    JWH-018 and JWH-250?
    A. JWH-018 should keep a conspicuous C=O stretching number than JWH-250.
    B. JWH-250 should keep a eager knot attributable encircling 1000 to 1200 cm-1 that JWH-018 should noncommunication.
    C. Twain A and B.
    D. Nundivided of these.
    JWH-018 JWH-250
  22. Which of the cethcoming is another disagreement betwixt the FTIR spectra of JWH-018 and JWH-250?
    A. JWH-250 should keep a conspicuous C=O stretching number than JWH-018.
    B. JWH-018 should keep a eager knot attributable encircling 1000 to 1200 cm-1 that JWH-250 should noncommunication.
    C. Twain A and B.
    D. Nundivided of these.
  23. Undivided habit to see the concretion spectra of JWH-018 and JWH-250 is by their molecular ion
    peaks. Which couple of m/z references represents the relative M+ peaks of JWH-018 and JWH-250?
    A. 342 and 336
    B. 018 and 250
    C. 339 and 333
    D. 341 and 335
  24. While their M+ peaks acceleration to see them, the concretion spectra of JWH-018 and JWH-250 keep
    a very high-abundance peak in beggarly betwixt them. That peak arises from manacle cleavage alpha
    to the ketundivided carbonyl, resulting in a beggarly remnant ion ce twain combinations. What is its m/z
    ratio?
    A. 270
    B. 324
    C. 241
    D. 214
    Another strange dispose of refuses is a cluster of analogs of the inferior substances cathinundivided and methcathinone,
    most frequently base in results marketed as “Bath Salts.” These substances, shown adown, keep chemical
    structures very common to each other and are thus unamenable to see by FTIR or GC-MS. Apology inquirys
    26 and 27 encircling these substances.
  25. Despite the unamenabley in seeing these combinations by FTIR and GC-MS, some of them conciliate
    disagree significantly in twain their concretion spectra and their FTIR spectra. Which of the aloft combinations
    conciliate disagree from ALL the others by its FTIR spectrum in the clime from 3500 to 3300 cm-1, and which
    conciliate disagree from ALL the others in the clime from 1300 to 1000 cm-1?
    A. Combination A conciliate disagree from ALL others in the 3500 to 3300 cm-1 clime; Combination E conciliate disagree
    from ALL others in the 1300 to 1000 cm-1 clime.
    B. Combination C conciliate disagree from ALL others in the 3500 to 3300 cm-1 clime; Combination F conciliate disagree
    from ALL others in the 1300 to 1000 cm-1 clime.
    C. Combination B conciliate disagree from ALL others in the 3500 to 3300 cm-1 clime; Combination C conciliate disagree
    from ALL others in the 1300 to 1000 cm-1 clime.
    D. Combination D conciliate disagree from ALL others in the 3500 to 3300 cm-1 clime; Combination E conciliate
    disagree from ALL others in the 1300 to 1000 cm-1 clime.
    A B C
    D E F
  26. Since FTIR and GC-MS are poor in their strength to discern incomplete these six combinations,
    which of the cethcoming rules would be over serviceable and should wholeow manageable identification of whole six
    compounds?
    A. HPLC with MS detection
    B. Atomic parching spectroscopy
    C. Solid-air nobility followed by ELISA
    D. Nuclear magnetic clang (NMR) spectrometry
  27. Which of the cethcoming air equilibria is most pertinent in incendiarism segregation?
    A. solid-solution bring-aboutweight
    B. solution-solution bring-aboutweight
    C. solid-gas bring-aboutweight
    D. soft-solution bring-aboutweight
  28. Which of the cethcoming could referable attributable attributable attributable confront SWGDRUG guidelines ce refuse identification?
    A. FTIR spectroscopy and a falsification ordeal
    B. TLC and capillary electrophoresis
    C. Raman spectroscopy and soft subject-matter
    D. GC, soft chromatography, and fluorescence spectroscopy
  29. Cocaine hydrochloride is discerptible in which of the cethcoming solvents?
    A. hexane
    B. chloroform
    C. diethyl ether
    D. nundivided of these
    Essay Inquiry (10 subject-matters). Expand your apology to additional pages.
  30. Choose undivided of the instrumental rules discussed either in exhortation or in the textbook and
    describe its agency and exercise in a habit that a layperson (nontechnical) would inferiorstand.
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