hw 9 answers - Iype, Shelby Homework 9 Due: Nov 6 2007,...

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Iype, Shelby – Homework 9 – Due: Nov 6 2007, midnight – Inst: Vandenbout 1 This print-out should have 23 questions. Multiple-choice questions may continue on the next column or page – fnd all choices beFore answering. The due time is Central time. Room Assignments For EXAM 2 A-K WEL 1.316 L-O WEL 2.122 P-Z WEL 1.308 001 (part 1 oF 1) 10 points IdentiFy the kinds oF intermolecular Forces that might arise between molecules oF N 2 H 4 . 1. hydrogen bonding 2. dipole-dipole 3. London Forces 4. None oF these 5. London Forces, dipole-dipole 6. London Forces, dipole-dipole, hydrogen bonding correct Explanation: N H H N H H is polar. 002 (part 1 oF 2) 10 points Calculate the ratio oF the potential energies For the interaction oF a water molecule with a Ca 2+ ion (oF radius 100 pm) and with an In 3+ ion (oF radius 72 pm). 1. 0 . 35 correct 2. 0.52 3. 0.76 4. 0.63 5. None oF these 6. 0.24 Explanation: r Ca = 100 pm r In = 72 pm The energy E p -| z | μ r 2 , so the ratio is E Ca E In = | z Ca | r 2 In | z In | r 2 Ca = | 2 | (72 pm) 2 | 3 | (100 pm) 2 = 0 . 3456 003 (part 2 oF 2) 10 points Which ion will attract a water molecule more strongly? 1. In 3+ correct 2. Ca 2+ 3. Equal attraction Explanation: The attraction oF the Ca 2+ ion will be less than that oF the In 3+ ion because it has both a larger radius and a lower charge. 004 (part 1 oF 1) 10 points Which oF the Following cations is likely to be hydrated in compounds? 1. NH + 4 2. Rb + 3. K + 4. Li + correct 5. Cs + Explanation: Li + is the smallest. 005 (part 1 oF 1) 10 points Which oF the Following compounds is UN- LIKELY to be commonly available and thus not Found in the laboratory?
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Iype, Shelby – Homework 9 – Due: Nov 6 2007, midnight – Inst: Vandenbout 2 1. BaCl 2 · 2H 2 O 2. Na 2 CO 3 · 10H 2 O 3. La(NO 3 ) 3 · 6HO 4. CuSO 4 · 5H 2 O 5. KCN · 2H 2 O correct Explanation: K + is only a +1 cation AND it is too large to substantially attract waters of hydration. +2 and +3 cations will generally form hydrates. Na + will also attract water due to its smaller size. 006 (part 1 of 1) 10 points What would be the most signiFcant type of intermolecular forces in a liquid sample of ±uoroform (CH² 3 )? 1. hydrogen bonding 2. dispersion 3. ionic 4. covalent 5. dipole-dipole correct Explanation: London forces, dispersion forces, van der Waals or induced dipoles all describe the same intermolecular force. London forces are in- duced, short-lived, and very weak. Molecules and atoms can experience London forces be-
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This note was uploaded on 03/30/2009 for the course CH 301 taught by Professor Fakhreddine/lyon during the Spring '07 term at University of Texas at Austin.

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hw 9 answers - Iype, Shelby Homework 9 Due: Nov 6 2007,...

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