Chemistry
10th Edition
ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
Section: Chapter Questions
Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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Transcribed Image Text:anch of the following components cannot be detected by gas chromatography?
4 Essential oils
Alcohols
b) Volatile compounds
d) Non-volatile compounds
13-
is measured as time elapsed from the point of injection to the peak maximum?
a)-Column efficiency d)- Delectability
c)-Retention time
14- Which of the following can be used to detect the components in gas chromatography
a) non-volatile compounds b) volatile compounds
c) Salts
d) b&c
15-Which of the following methods is often referred to as mechanical separation processes.
a)-Gas Chromatography b)-column chromatography c)- Sedimentation
16- For obtaining better resolution in TLC.
and then developed with a second solvent at right angles to the first
a) Stepwise b) Descending e) Ascending
17- This is defined as transport of electrically charged particles in a direct-current electric field
a) ion exchange chromatography b) Electrophoresis c) ultracentrifuge
d) exclusion
18-This figure indicates to schematic Diagram of
a) Gas chromatography
b) supercritical fluid chromatography
c) high pressure liquid chromatography
d) Capillary Electrochromatography
d)-HPLC
development is spotted in the normal manner
20-As shown in figure a Van Deemter plot
What useful information can be found?
a) Optimum column length
b) Optimum mobile phase flow rate
c) Optimum column temperature
d) Optimum column height
d) Two-dimensional
La
Puny
19- The electron capture detector in Gas chromatography can be used to detect?
a) Halogenated compound
bjaromatic compounds
c) universal compound
Lille
d)-Rf
Opten vey
d)metals
A typical Van Desmer plot
Migrate
Mobile phase velocity
tR=tM (1+K') this equation to calculate the time a component takes to travel the length of
e column (L), in which symbol K' indicates ?
city factor b) separation factor
c) number of theoretical plates
d) width of pe
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