5 Written questions
4 Multiple choice questions
- a process in which an applied vacuum draws a solution through filter paper held in a Buchner funnel.
- The continual boiling and condensing of a reaction mixture to ensure that the reaction takes place without the contents of the flask boiling dry.
- 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.
- 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
Sublimination → container that can be sealed from the atmosphere and holds a drying agent
Column Chromatography → mixture 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.
Gas Chromatography → An analytical technique which separates mixtures based on their distribution between a stationary liquid phase and a moving gas phase.
Simple Distillation → useful to separate two liquids w/ vastly diff. boiling points at least 20 degrees C.