
Chromatography: separating a mixture of inks
Quiz by Oak National Academy: GCSE Chemistry OCR Foundation
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6 questions
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- Q1Which of the following is not part of preparing a chromatography paper?marking the solvent frontdrawing a sample lineheating the paperadding a small volume of solvent30s
- Q2Why do we use pencil to draw the sample line in chromatography?pencil marks dissolve in the solventpencil is more visible than inkpencil reacts with the inks to help them separatepencil marks do not travel with the solvent30s
- Q3What is the purpose of the stationary phase in chromatography?to change the colour of the inksto hold the substances as they separateto absorb the solventto move the solvent30s
- Q4True or false? The solvent front should be marked after the paper is removed from the container.truefalseTrue or False30s
- Q5True or false? If two substances have the same Rf value then they must be the same substance.falsetrueTrue or False30s
- Q6Calculate the Rf value of a spot that travels 55 mm up from the sample line, where the chromatogram shows a solvent front of 86 mm.Users enter free textType an Answer30s