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2.1 Purity and separating mixtures

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Question 5

A forensic scientist uses thin layer chromatography to compare the inks from two pens. Spots of each ink are placed on a start line on a glass sheet coated with a thin layer of silica gel. The bottom of the sheet is stood in ethanol in a covered tank.

What is the stationary phase in this experiment?

[1]
A

The coating of silica gel

B

The glass sheet under the coating

C

The inks from the two pens

D

The ethanol in the tank

Markscheme

2.1 Purity and separating mixtures Questions

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

102 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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