Analytical Chem (Concepts) Flashcards
An air sample is subjected to gas chromatography for the analysis of Freon-11 (CCIF). The detector that is most suitable for this analysis is
ECD
An advantage of HPLC over GC for the separation and measurement of high molecular weight compounds is that
The preparation of volatile derivatives is not necessary in HPLC.
Reversed-phase chromatography refers to
A nonpolar stationary phase and a polar mobile phase
the correct order of elution (first to last) from an HPLC column containing a reversed-phase packing
acetamide, acetone, dichloroethane (-ide,-one,di)
It is the nominal volume of water (or mercury) contained, or delivered by an article of volumetric glassware, at its reference temperature.
Capacity
To determine the density of a liquid, which of the following should be used?
pycnometer
Which technique is recommended for determining the odor of an unknown liquid in the laboratory?
Wafting
When exposure to hazards cannot be engineered completely out of normal operations, this supplementary method of control can be used.
Use of PPE
The reactant which is present in the smallest stoichiometric amount and which limits the amount of product that can be formed in a reaction is
the limiting reagent
The normality of a solution is always ________ the molarity.
greater than or equal to
In this column type, the retention is governed by the interaction of the polar parts of the stationary phase and solute.
normal phase
The HPLC column type in which molecules are separated according to size.
size exclusion
In chromatography,_________ is carried out on glass plates or strips of plastic or metal coated on one side with a thin layer of adsorbent.
Thin Layer Chromatography
Conductivity could be determined using the distance between the electrodes and their surface area using Ohm’s law but, for accuracy, a calibration is employed using _________of well-known conductivity.
electrolytes
When NH4Cl hydrolyzes, the resulting solution is
acidic
