EXAM1SOL - Moore, Robert Exam 1 Due: Feb 8 2007, noon Inst:...

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Moore, Robert – Exam 1 – Due: Feb 8 2007, noon – Inst: McCord 1 This print-out should have 20 questions. Multiple-choice questions may continue on the next column or page – fnd all choices be±ore answering. The due time is Central time. toluene: C 6 H 5 CH 3 = 92.14 g/mol carbon tetrachloride: CCl 4 = 153.81 g/mol 001 (part 1 o± 1) 10 points Which o± the ±ollowing molecules is most sol- uble in water? 1. CH 3 CH 2 OH correct 2. CH 4 3. benzene (C 6 H 6 ) 4. CCl 4 5. CH 3 CH 2 CH 2 CH 2 CH 2 CH 3 Explanation: 002 (part 1 o± 1) 10 points Water ±rom a local stream is added to one side o± the U-tube shown below. Pure water is placed in the tube on the other side o± the semipermeable membrane. With the le±t side open to barometric pressure o± 1.0 atm and 1.5 atm applied to the right side, the two liquids do not move. 1.00 atm 1.15 atm B A In which hal± o± the U-tube is the pure water located? 1. Not enough in±ormation is given. 2. B 3. A correct Explanation: 003 (part 1 o± 1) 10 points Several interesting observations ±rom the world around you are listed below. Which o± these is NOT explained by a colligative property? 1. Anti±reeze is added to a car radiator to keep the car ±rom overheating. 2. Water boils at a higher temperature when salt is added. 3. The ±reezing point o± water is lowered when salt is added. 4. At high altitude it takes longer to cook spaghetti. correct 5. A lobster will die when placed in ±resh water. Explanation: Colligative properties o± a solution depend on the number o± solute particles in solution, not the type. Boiling point variations due to pressure changes have nothing to do with solutions and colligative properties (boiling point variations due to particles in solution, etc.). 004 (part 1 o± 1) 10 points Consider a series o± chloride salts (MCl 2 ). As the charge-to-size ratio o± M 2+ (decreases, increases) the hydration energy o± M 2+ (de- creases, increases, does not change) in magni- tude and the crystal lattice energy o± MCl 2 (decreases, increases, may increase or de- crease) in magnitude. 1. increases; increases; increases correct 2. increases; does not change; may increase or decrease 3. decreases; increases; increases
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Moore, Robert – Exam 1 – Due: Feb 8 2007, noon – Inst: McCord 2 4. increases; decreases; increases 5. decreases; decreases; increases 6. increases; decreases; decreases 7. increases; increases; decreases Explanation: As charge-to-size ratio increases, hydration energy and crystal latice energy also increase. 005
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EXAM1SOL - Moore, Robert Exam 1 Due: Feb 8 2007, noon Inst:...

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