← Ochem Lab Test
5 Written Questions
4 Multiple Choice Questions
- container that can be sealed from the atmosphere and holds a drying agent
- 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.
- a process in which an applied vacuum draws a solution through filter paper held in a Buchner funnel.
- 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.
4 True/False Questions
Gas 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.
Sublimination → the process in which a solid changes directly into a gas
Thin layer Chromatography → A technique that uses a solid stationary phase and a moving liquid phase to separate the components of a mixture.
Reflux → container that can be sealed from the atmosphere and holds a drying agent