GCSE Chemistry Specification

OCR B J258

Section C5.1: How are chemicals separated and tested for purity?

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#C5.1.1

explain that many useful materials are formulations of mixtures

#C5.1.2

explain what is meant by the purity of a substance, distinguishing between the scientific and everyday use of the term ‘pure’

#C5.1.3

use melting point data to distinguish pure from impure substances

#C5.1.4

recall that chromatography involves a stationary and a mobile phase and that separation depends on the distribution between the phases

#C5.1.5

interpret chromatograms, including calculating Rf values

#C5.1.6

suggest chromatographic methods for distinguishing pure from impure substances
PAG4

Including the use of:
a) paper chromatography
b) aqueous and non-aqueous solvents
c) locating agents

#C5.1.7

describe, explain and exemplify the processes of filtration, crystallisation, simple distillation, and fractional distillation
PAG3, PAG7

#C5.1.8

suggest suitable purification techniques given information about the substances involved
PAG3, PAG7