explain that many useful materials are formulations of mixtures
explain that many useful materials are formulations of mixtures
explain what is meant by the purity of a substance, distinguishing between the scientific and everyday use of the term ‘pure’
use melting point data to distinguish pure from impure substances
recall that chromatography involves a stationary and a mobile phase and that separation depends on the distribution between the phases
interpret chromatograms, including calculating Rf values
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
describe, explain and exemplify the processes of filtration, crystallisation, simple distillation, and fractional distillation PAG3, PAG7
suggest suitable purification techniques given information about the substances involved PAG3, PAG7