1) An ink mixture contains 3 different soluble pure inks. How many ink spots would you see? a) 0 b) 1 c) 2 d) 3 e) 4 f) 5 2) What inks are definitely in Mixture X? a) A only b) B only c) C only d) A + B e) A + C f) B + C 3) Which substance is the most soluble in the solvent? a) X b) Y c) Z 4) Why might a substance remain on the start line after chromatography? a) It is extremely soluble in the solvent b) It is insoluble in the chromatography paper c) It is insoluble in the solvent d) It can't travel upwards against gravity 5) What is the mobile phase? a) The solvent b) The solute c) The chromatography paper d) The pencil line 6) How do you calculate Rf? a) Distance solvent travels/distance ink travels b) Distance pencil line travels/distance solvent travels c) Distance solvent travels/distance to solvent front d) Distance ink travels/distance solvent travels 7) Which of these is a reason you might see ink in the solvent? a) The solvent is above the start line b) The start line was drawn in pen c) There is no lid on the beaker d) The ink was a mixture 8) Distance solvent travel = 10cm. Distance ink travels = 4cm. What is the Rf value? a) 0.4 b) 0.6 c) 2.5 d) 40

Chromatography

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