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5 Written questions

4 Multiple choice questions

  1. container that can be sealed from the atmosphere and holds a drying agent
  2. 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.
  3. condenser such that vapor over a boiling liquid is condensed and flows back into the vessel to prevent its contents from boiling dry
  4. a process in which an applied vacuum draws a solution through filter paper held in a Buchner funnel.

4 True/False questions

  1. Gravity 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.

          

  2. Fractional DistillationThe 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.

          

  3. RecrystallizationSeparation 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. Gas Chromatographymixture of compounds to be separated is introduced onto the column that is packed with a stationary solid. The solid is continuously washed by a flow of solvent (mobile) passing through the column. The continuous flow of solvent throught the column and the interaction b/w the solid compounds in the mixture, separates the mixture as it passes down the colum.

          

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