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6. What does a solid stationary phase separate compounds by?

  • relative solubility
  • adsorption
  • absorption

7. Name the stationary phase in thin layer chromatography?

  • inert gas
  • thin layer of adsorbent on inert support
  • thin layer of solid inside capillary tubing
  • liquid solvent

8. Why is it important to seal the jar containing the TLC plate?

  • to speed up evaporation of the solvent
  • to allow the process to occur
  • to slow the evaporation of the solvent from the TLC plate
  • to prevent bacteria contaminating the sample

9. Which is NOT a limitation of thin layer chromatography?

  • unknown compounds have no Rf value for comparison
  • similar compounds have similar retention times
  • similar compounds have similar Rf values
  • may be difficult to find a solvent which will separate all components

10. What does a liquid stationary phase separate by?

  • relative solubility
  • adsorption
  • absorption