What is the last step in a thin-layer chromatographic analysis?
a. Visualization
b. Spotting the unknown
c. Spotting a standard
d. Developing the plate in an enclosed tank
(Question #2) What is the most satisfactory way of simultaneously separating and tentatively identifying drugs?
a. Ultraviolet spectrophotometry
b. Infrared spectrophotometry
c. Emission spectroscopy
d. Chromatography
(Question #3) What reagent is used for the field test of heroin?
a. Marquis
b. Duquenois-Levine
c. Scott reagent
d. Van Urk
(Question #4) The analysis of available data can be considered a type of unobtrusive measure.
Indicate whether the statement is true or false
(Question #5) ______ are key persons in field research who will vouch for the researcher's presence and serve as an entree to the field setting.
Fill in the blank(s) with correct word
(Question #6) What does the recorder of a spectrophotometer measure?
a. The Rf value of light
b. The retention time of light
c. Absorption of light at specific frequencies
d. The refractive index of light
(Question #7) The distribution of a substance between a mobile and stationary phase describes what?
a. Spectrophotometry
b. Dispersion
c. Density-gradient tubes
d. Chromatography
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