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2.1 Purity and separating mixtures

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Question 20
F

In the same solvent, substance P has an Rf value of 0.82 and substance Q has an Rf value of 0.15.

Which statement explains why P moves further up the paper than Q?

[1]
A

P is more strongly attracted to the stationary phase than Q is.

B

Q is more soluble in the mobile phase than P is.

C

Q has heavier particles than P, so the solvent cannot carry Q as far.

D

P spends a greater proportion of its time in the mobile phase than Q does.

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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