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Question 17N.3.HL.TZ0.01b

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Date November 2017 Marks available [Maximum mark: 3] Reference code 17N.3.HL.TZ0.01b
Level HL Paper 3 Time zone TZ0
Command term Explain Question number b Adapted from N/A
b.
[Maximum mark: 3]
17N.3.HL.TZ0.01b

 

(b)

Explain what the Rf values represent in chromatography.

[3]

Markscheme

a.

     OR

    distance moved by pigment relative to distance moved by solvent

b. each pigment has/is represented by a specific Rf «value»

c. used to identify different pigments

d. Rf «value» depends on density/solubility/polarity of the pigment in solvent

Allow “compound” or “molecule” instead of pigment

[Max 3 Marks]

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