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Chromatography
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* Indicates required question
Tick the four physical techniques used to separate mixtures.
*
4 points
chromatography
electrolysis
precipitaton
neutralisation
distillation and fractional distillation
filtration
crystallisation
displacement
Required
What is the name of the process shown below
*
1 point
distillation
fractional distillation
electrolysis
chromatography
why would you draw the origin line in pencil?
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1 point
because pencil (graphite) is insoluble in many solvents
because it looks pretty
to be able to see the colours properly
to encourage water to rise up the paper
What is label A
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1 point
lid
chromatogram
capture device
ink spots
What is label B
*
1 point
lid
Chromatography paper
capture device
ink spots
What is label C
*
1 point
Chromatography paper
solvent
Beaker
What is label D
*
1 point
pencil line
Chromatography paper
solvent
ink spots
What is label E
*
1 point
pencil line
Chromatography paper
solvent
ink spots
What is label F
*
1 point
pencil line
Chromatography paper
solvent
ink spots
Which letter represents the stationary phase?
*
1 point
A
E
B
F
Which letter represents the mobile phase?
*
1 point
A
E
B
F
once you have completed your chromatogram, what can you use to identify a substance?
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1 point
Rf value
Tf value
Ef value
mobility of the solvent
What is the equation for the retention factor, Rf?
*
1 point
Option 2
Ef value
Option 4
Option 1
The Rf will ALWAYS be between what two numbers?
*
1 point
0-3
1-2
0-1
0-100
What two things does the Rf depend on? select all correct answers
*
2 points
how soluble the substance is in the mobile phase
how soluble the substance is in the stationary phase
how attracted they are to the stationary phase
how attracted they are to the beaker
Required
Calculate the Rf for spot Y from the chromatogram below
*
1 point
Your answer
Calculate the Rf for spot Z from the chromatogram below
*
1 point
Your answer
Which spot, X, Y or Z was most soluble in the solvent used?
*
1 point
X
Y
Z
the results from a chromatography investigation into dyes are sown below, which colour inks are pure substances, select all the correct answers
*
2 points
purple
green
yellow
brown
Required
How many different components does the brown ink contain? Please write your answer as a single number
*
1 point
Your answer
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