Name: ___________________
Period: ____
Separation Techniques Mini-Unit TAKE HOME Quiz
1. A characteristic feature of any form of chromatography is the…
a) use of a mobile and a stationary phase
b) calculation of an Rf value for the molecules separated
c) use of molecules that are soluble in water
d) use of an inert gas
2. Which of the following statements about chromatography is INCORRECT?
a) Silica gel is commonly packed in the vertical glass column in column chromatography.
b) The substances with different Rf values are considered as different compounds.
c) The component substances are separated according to their different solubilities in the
solvent.
d) In paper chromatography, a pen is used for drawing the baseline.
4. The instrument show here is used for a separation technique called…
This method of separation is called...
a) filtration
b) distillation
c) paper chromatography
d) column chromatography
5. The piece of equipment labeled X is called...
a) a distillation tube
b) a condenser
c) an evaporator
d) a round bottomed flask
6. In the set up shown in #5 and #6, what is in the beaker to the far left?
a) salt
b) water
c) isopropyl alcohol
d) the reagents
6. A mixture of different colored inks can be separated using...
a) chromatography
b) distillation
c) evaporation
7. Liquids that do NOT mix are said to be
a) immiscible
b) miscible
c) soluble
d) filtration
d) flammable
8. Soluble liquids that have different boiling points can be separated by
a) decanting
b) filtration
c) distillation
d) chromatography
9. Which of the following pairs of substances may best be separated through distillation?
a) water and soil
b) sand and soil
c) salt and sand
d) water and isopropyl alcohol
10. Using paper chromatography, the Rf value for xanthophyll was 0.3 and the value for chlorophyll
was 0.7. Which of the following is true?
a) Xanthophyll is more soluble than chlorophyll
b) Chlorophyll is a larger molecule than xanthophylls
c) Chlorophyll traveled farther up the paper
d) Chlorophyll is more polar than xanthophylls
11. What is the maximum Rf value?
a) 0.1
b) 1.0
c) 10
d) infinity
12. Calculate the Rf value(s) associated with the following piece of chromatography paper.
solvent front
13. What is the purpose of covering the container when doing a paper chromatography?
14. A paper chromatography is completed using water as a solvent. The mixture that is placed on
the paper consists of a polar component and a nonpolar component. Draw a picture of what the
chromatography paper looks like when it is complete and explain your reasoning.
15. Place the letters below into the appropriate separation technique box. The letters represent
equipment, terminology, set-up, and process associated with each separation technique. Some
letters will go in more than one box.
Paper Chromatography
A.
B.
C.
D.
Funnel
Retention factors
Filtrate
Dry packing
Column
Chromatography
E.
F.
G.
H.
Condenser
Stationary phase
Distillation flask
Solvent front
Distillation
I. Pasteur pipet
J. Collection vessel
K. Mobile phase
L. Silica gel
Filtration
M.
N.
O.
P.
Wool
Filter paper
Sand
Residue