Chemistry-C1-Mixtures and Chromatography 0.0 / 5 ? ChemistryAtoms and compoundsGCSEAQA Created by: tonisha_Created on: 18-10-22 19:19 What is a mixture? a substance made up of 2 or more atoms NOT chemically bonded together 1 of 23 This means that they can be separated out by? physical methods 2 of 23 What are physical methods? methods which dont contain chemical reactions 3 of 23 What are the two phases in separating mixtures in chromatography? mobile stationary 4 of 23 What is the mobile phase? where the molecules can move e.g. in liquid (solvent) or gas 5 of 23 What is the stationary phase? where the molecules cannot move e.g. in a solid (like paper) 6 of 23 More soluble substances spend more time in what phase? mobile phase 7 of 23 Less soluble substances spend more time in the? stationary phase 8 of 23 PRACTICAL-PAPER CHROMATOGRAPHY ---------------------------------------------- Firstly, draw a_____ near the _____ of a sheet of _____ _____? draw a line near the bottom of a sheet of filter paper 9 of 23 What must you use to draw this? why? a pencil since it is insoluble and wont spread in the solvent 10 of 23 Then use the ____ and place a ____ on the ____ of the line? use the ink and place a dot on the middle of the line 11 of 23 Then fill a ______ ______ or a _____ with water ? fill a test tube or beaker with water 12 of 23 But ensure that the ink? is not touching the water 13 of 23 To ensure this what should you do to the excess paper? fold it over the beaker 14 of 23 This prevents it from? being dragged down 15 of 23 As the solvent _____ up the paper, different ____ in the ink will do what? as the solvent moves up the paper, different dyes in the ink will move up the paper 16 of 23 At a different? rate 17 of 23 This _____ them out? separates 18 of 23 What does it mean if the dye stays on the baseline? it is insoluble 19 of 23 Then what should we do with the paper? take it out and leave it to dry 20 of 23 That leaves us with a what? chromatogram 21 of 23 How do you calculate the Rf value? distance by substance B ---------------------------- distance by solvent A 22 of 23 The higher up the colour is on the paper? the more soluble it is 23 of 23
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