← Ochem Lab Test
5 Written Questions
4 Multiple Choice Questions
- A technique that uses a solid stationary phase and a moving liquid phase to separate the components of a mixture.
- An analytical technique which separates mixtures based on their distribution between a stationary liquid phase and a moving gas phase.
- 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
Gravity filtration → a process in which an applied vacuum draws a solution through filter paper held in a Buchner funnel.
Desiccator → The continual boiling and condensing of a reaction mixture to ensure that the reaction takes place without the contents of the flask boiling dry.
Column Chromatography → An analytical technique which separates mixtures based on their distribution between a stationary liquid phase and a moving gas phase.
Vacuum Filtration → Gravity filtration is used for when the desired product is in solution (usually hot) where as vacuum filtration has the desired product being a solid.