Homework 2 - phan (dhp354) HW 02 Solutions vanden bout...

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phan (dhp354) – HW 02 Solutions – vanden bout – (51165) 1 This print-out should have 42 questions. Multiple-choice questions may continue on the next column or page – fnd all choices beFore answering. 001 10.0 points Both ammonia and phosphine (PH 3 ) are sol- uble in water. Which is least soluble and why? 1. ammonia; it is too small to be hydrated by water molecules. 2. ammonia; it does not Form hydrogen bonds with water molecules. 3. ammonia; the N - H bonds are so strong that they cannot break to enable the ammonia to hydrogen-bond with water. 4. phosphine; it does not Form hydrogen bonds with water molecules. 5. phosphine; the P - H bonds are so strong that they cannot break to enable phosphine to hydrogen-bond with water. 002 10.0 points Some distilled water is added to an empty beaker. A gram oF copper(II) nitrate is added to the beaker with stirring. AFter a Few min- utes, what is in the beaker? 1. solid copper, nitrate ions, and water 2. nitrogen gas, copper atoms, electrons, and water 3. solid copper(II) nitrate and water 4. a sticky material oF copper hydronitrite 5. copper ions, nitrate ions, and water 003 10.0 points Which is the best representation oF the solva- tion oF a sodium cation in water? hydrogen oxygen Na + ion 1. 2. 3.
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phan (dhp354) – HW 02 Solutions – vanden bout – (51165) 2 4. 004 10.0 points When we put sugar in water it melts. 1. True 2. False 005 10.0 points Rank the following in terms of decreas- ing miscibility in C 8 H 18 (octane): C 2 H 5 Cl (chloroethane), H 2 O (water), C 2 H 5 F (±uo- roethane), C 9 H 20 (nonane). 1. C 9 H 20 > C 2 H 5 Cl > C 2 H 5 F > H 2 O 2. H 2 O > C 9 H 20 > C 2 H 5 Cl > C 2 H 5 F 3. C 2 H 5 Cl > C 2 H 5 F > H 2 O > C 9 H 20 4. C 2 H 5 F > H 2 O > C 9 H 20 > C 2 H 5 Cl 006 10.0 points Octane (C 8 H 18 ) is a major component of gaso- line. Which of the following would you expect to be the LEAST soluble in gasoline? 1. table sugar 2. motor oil 3. candle wax 4. diesel fuel 5. table salt 007 10.0 points Which of the following is a possible combina- tion of values for ΔH lattice , ΔH hydration and ΔH solution , respectively, for a salt whose dis- solution is endothermic. 1. - 450 , +400 , and - 50 kJ · mol 1 , 2. - 900 , - 900 , and - 1800 kJ · mol 1 , 3. +640 , - 620 , and + 20 kJ · mol 1 , 4. +550 , - 480 , and + 1030 kJ · mol 1 , 008 10.0 points A solvent is just another name for a solution. 1.
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This note was uploaded on 02/05/2012 for the course CH 302 taught by Professor Holcombe during the Spring '07 term at University of Texas at Austin.

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Homework 2 - phan (dhp354) HW 02 Solutions vanden bout...

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