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Tutor HuntTest QuestionsChemistry QuestionsYear 10 Chemistry Questions

 

Chromatography (GCSE Chemistry)

The following is a GCSE Chemistry test covering 'Chromatography' from the broader topic Chemical Analysis. The test is geared towards the AQA exam board style syllabus.
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Question 1
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Below a typical questions that will be covered in this test. You final score will be logged on your account

Why is it important to use a small concentrated spot (small volume) when applying sample to the start line?
When calculating Rf, why is it important to measure distances from the start line rather than from the bottom edge of the paper?
Why does changing the solvent polarity change Rf values in paper chromatography?
A dye has polar functional groups and is run on silica gel (polar stationary phase) with a nonpolar solvent. Which outcome is most likely?
If two components have Rf values 0.30 and 0.33 on one solvent system, what is the simplest practical step to try to separate them better?
Which statement best explains why Rf values are reproducible only under identical conditions?
What is the Rf value if a dye spot moves 3.6 cm from the start line and the solvent front moves 9.0 cm?
A student calculates Rf = 0.48 for a spot that moved 5.4 cm. What was the solvent front distance?
Which detection method is commonly used to visualise spots that are colourless on chromatography paper?
What is the main reason a chemist would choose paper chromatography rather than TLC for a classroom activity?
A student used pencil to draw the start line and the solvent washed the ink away. What mistake was made?