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2.1 Purity and separating mixtures

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Question 15
F

A student uses chromatography to separate a mixture of amino acids. The spots on the dried chromatogram are colourless.

What should the student do so that the spots can be seen?

[1]
A

Use a coloured solvent as the mobile phase.

B

Draw the start line in ink so that the spots show up against it.

C

Spray the chromatogram with a locating agent.

D

Heat the chromatogram strongly until the spots burn.

Markscheme

2.1 Purity and separating mixtures Questions

  1. GCSE
  2. /Chemistry
  3. /2.1 Purity and separating mixtures

51 exam-style questions on OCR GCSE Chemistry 2.1 Purity and separating mixtures, covering 2.1.1 Pure substances and melting point data, 2.1.2 Relative formula mass and empirical formula, 2.1.3 Formulations as useful mixtures, 2.1.4 Techniques for separating mixtures, and 2.1.5 Chromatography and Rf values. Each one has a worked solution and a mark scheme showing where the marks go.

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