Chromatography 0.0 / 5 ? ChemistryAnalysing substancesGCSEAQA Created by: MattJGCreated on: 26-01-17 22:24 Chromatography is used to separate substances from a what? Mixture 1 of 15 What is the phase called where molecules can move? Mobile 2 of 15 What is the phase called where molecules can't move? Stationary 3 of 15 Chemicals which spend more time in the mobile phase, go what through the stationary phase? Further 4 of 15 Chromatography paper is the what phase? Stationary 5 of 15 The solvent is the what phase? Mobile 6 of 15 Substance A moved 33cm - the solvent moved 35 cm - what is the rf value? 0.94 7 of 15 Substance B moved 14cm - the solvent moved 35 cm - what is the rf value? 0.4 8 of 15 Substance C moved 21cm - the solvent moved 35 cm - what is the rf value? 0.6 9 of 15 The ration between the distance travelled by solvent and substance is called the what value? Rf 10 of 15 If molecules are more soluble will the spend more or less time in the stationary phase? Less 11 of 15 If molecules are less attracted to the paper will the spend more or less time in the mobile phase? More 12 of 15 The Rf value is dependent on the what? Solvent 13 of 15 What is usually the solvent in chromatography? Water 14 of 15 What is usually the stationary phase in chromatography? Paper 15 of 15
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