WorksheetsBasics of Chromatography
Total questions: 15
Worksheet time: 9mins
Chromatography is a physical method that is used to separate and analyze.....
simple mixtures
complex mixtures
viscous mixtures
metals
In which type of chromatography, the stationary phase held in a narrow tube and the mobile phase is forced through it under pressure?
column chromatography
planar chromatography
liquid chromatography
In chromatography, the stationary phase can be _____ supported on a solid.
liquid or gas
solid or liquid
solid only
liquid only
In chromatography, which of the following can be mobile phase be made of?
solid or liquid
liquid or gas
gas only
liquid only
Chromatography cannot be used to purify volatile substances.
True
False
The retention factor is used to...
zero the chromatography scale
retain the solvent
identify unknown compounds in a sample
as a starting tool for chromatography
The Rf value for the blue component is..
0.3
0.7
10
3
Why must the base line in TLC be drawn in pencil and not pen?
pencil is good at keeping substances in place
pencil is soluble in water
pencil is insoluble in water
pencil is not colored
The substance in the mixture that has the greatest affinity for the mobile phase will travel...
fastest
slowest
A student extracts the color from some green smarties and uses paper chromatography to separate components colors. She finds blue has a Rf=0.38, and yellow Rf=0.75. This suggests...
yellow is more strongly adsorbed onto the stationary phase and is less soluble in mobile phase.
the yellow is more strongly adsorbed onto the stationary phase and is more soluble in the mobile phase.
the blue is more strongly adsorbed onto the stationary phase and is less soluble in the mobile phase.
the blue is more strongly adsorbed onto the stationary phase and is less soluble in the mobile phase.
The Rf value for the red component is...
0.3
10
0.7
7
Which plant species has plant pigments similar to those in A?
B
C
D
If a substance is not soluble in the solvent, what happens to the spot placed on the start line?
Dot moves to the top of the paper
Dot moves to the left or right
Dot does not move at all
Dot moves down to the bottom of the paper
Whose blood stain was found at the crime scene?
Bob
Lisa
John
Sue
The diagram shows a chromatogram obtained when a sample X was analyzed together with four other known dyes P, Q,R and S. Dye Q was known to cause cancer. Which of the following dye(s) is/are safe for use?
P only
P and S
S only
P and X
