Cambridge IGCSE Combined Science practice

Paper 6 structured question: Chromatography

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Paper

Marks

Topic

Chromatography

Exam-style question

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Paper 6Alternative to PracticalPractical2 marks

A results table was created from a chromatography experiment.

Results Table

The table shows the Rf values for different dyes separated during the experiment.

Dye	Distance Traveled by Dye (cm)	Distance Traveled by Solvent (cm)	Rf Value
Dye A	3	6	0.5
Dye B	4.5	6	0.75
Dye C	1.5	6	0.25

a
Calculate Calculate the Rf value for Dye C based on the data provided.
Your answer
Aim for approximately 2 distinct marking points.
[2]

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Paper 6Alternative to PracticalPractical1 marks

Method

In this experiment, a mixture of dyes was placed on chromatography paper. A solvent was allowed to travel up the paper, carrying the dyes with it.

Step	Description
1	Prepare the chromatography paper with a baseline.
2	Apply a small spot of the dye mixture on the baseline.
3	Place the paper in a beaker with a small amount of solvent.
4	Allow the solvent to travel up the paper.

a
State What is the independent variable in this chromatography experiment?
Your answer
Aim for approximately 1 distinct marking point.
[1]