Chromatography Quiz
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5 questions, one answer each
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1. What does paper chromatography separate?
- A. Mixtures of soluble substances
- B. Insoluble solids from liquids
- C. Gases from liquids
- D. Isotopes of an element
2. Why is the baseline on a chromatogram drawn in pencil rather than ink?
- A. Pencil dissolves faster in the solvent
- B. Pencil marks do not dissolve and move in the solvent
- C. Pencil is easier to see
- D. Ink is too expensive to use
3. A chromatogram of an unknown sample shows three separate spots. What does this tell you?
- A. It is a pure substance
- B. It is a mixture of at least three substances
- C. It reacted with the solvent
- D. The experiment failed
4. What is sprayed onto a chromatogram to reveal colourless substances?
- A. A flame test reagent
- B. A locating agent
- C. Filter paper
- D. Universal indicator
5. A substance travels 4.5 cm from the baseline while the solvent front travels 9.0 cm. What is its Rf value?
- A. 0.2
- B. 0.45
- C. 0.5
- D. 2.0