midterm problems 4

midterm problems 4 - and 2. d) solvent 2, then 3, 1, 4, and...

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Lecture 4 Practice Problems 1. Which compound from the list below will be the most soluble in ethyl acetate? a) 1 b) 2 c) 3 d) 4 e) 5 O O H Cl Cl H H 1 2 3 4 5 2. Which compound from the list above will be the most soluble in cyclohexane? a) 1 b) 2 c) 3 d) 4 e) 5 3. Indicate which layer the following compounds will be found. A B _____Aqueous layer (density = 1.0 g/ml) _____ Diethyl Ether organic layer (density = .71 g/ml) _____ OH HO _____ O O _____ ______ O O _____ 3 M H 2 SO 4 _______ 2-methyl butane
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4. Rank the solvents from most polar to least polar: 1) methanol 2) benzene 3) diethyl ether 4) acetonitrile 5) acetic acid a) solvent 4, then 5, 1, 3, and 2. b) solvent 1, then 4, 5, 2, and 3. c) solvent 5, then 1, 4, 3,
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Unformatted text preview: and 2. d) solvent 2, then 3, 1, 4, and 5. 5. In recrystallization, why is it important to cool the solution slowly? a) in order to trap out all the impurities b) in order to achieve the biggest crystals c) in order to form a seed crystal d) in order to keep all of the impurities in solution, rather than in the crystals 6. A student performs an extraction in a separatory funnel. Compound A is extracted with 200 mL of ether two times from 250 mL of water. If there are 4.25 g total grams of compound A, how much of compound A will remain in the water layer after the two extractions? a) .22 g b) 1.2 g c) .97 g d) 3.98 g 7. After the two extractions, the student evaporates the solvent from compound A. What is the percent recovery? a) 5% b) 27% c) 95% d) 73% 8) The addition of an ionic substance such as NaCl is often used during an extraction to prevent: a) salting out b) precipitations c) emulsions d) separation...
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This homework help was uploaded on 04/17/2008 for the course CHEMISTRY 625 taught by Professor Waetzig during the Spring '08 term at Kansas.

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midterm problems 4 - and 2. d) solvent 2, then 3, 1, 4, and...

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