Select all correct statements from below. a. Recrystallization is a technique used to purify solid compounds based on solubility differences at different temperatures. b. Toluene is a clear, colorless liquid which becomes a vapor when exposed to air at room temperature. Do not breathe in. Always handle it in the fume hood. c. Filtration is a technique to separate solid from liquid(s). d. There are two different filtration techniques: Gravity Filtration and Vacuum Filtration.

Recrystallization is a technique for purifying solid compounds. Solids tend to dissolve more in hot liquids than in cold liquids. During recrystallization, the impure solid compound is dissolved in a hot liquid until the solution is saturated, after which the liquid is cooled.

Toluene is a clear, colorless liquid that evaporates in the air at room temperature. Toluene smoke has a pungent or sweet odor, which is a sign of exposure. Toluene is typically used as a mixture with other solvents and chemicals such as paint pigments. Inhalation of small doses of toluene vapor can cause mild headaches, dizziness, drowsiness, or nausea.

Filtration is the process of separating an insoluble solid from a liquid. When filtering a mixture of sand and water: the sand remains on the filter paper (it becomes a residue). Water flows through the filter paper (it becomes a filtrate). Gravity filtration and vacuum or suction filtration are the types of filtration.

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