NAME: ________________________

Ochem Lab Test

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5 Written Questions

4 Multiple Choice Questions

  1. A technique that uses a solid stationary phase and a moving liquid phase to separate the components of a mixture.
  2. An analytical technique which separates mixtures based on their distribution between a stationary liquid phase and a moving gas phase.
  3. The separation of the components in a liquid mixture into fractions which differ in boiling point (and hence chemical composition) by means of distillation, typically using a fractionating column.
  4. Separation technique used to purify particles of interest from a mixture of solids. Mixture is dissolved in saturating amounts in warm solvent. As the solution cools, the pure substance crystallizes while impurities remain in solution.

4 True/False Questions

  1. Gravity filtrationa process in which an applied vacuum draws a solution through filter paper held in a Buchner funnel.

          

  2. DesiccatorThe continual boiling and condensing of a reaction mixture to ensure that the reaction takes place without the contents of the flask boiling dry.

          

  3. Column ChromatographyAn analytical technique which separates mixtures based on their distribution between a stationary liquid phase and a moving gas phase.

          

  4. Vacuum FiltrationGravity filtration is used for when the desired product is in solution (usually hot) where as vacuum filtration has the desired product being a solid.

          

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