HW9 S - Owlia, Arria Homework 9 Due: Nov 6 2007, midnight...

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Unformatted text preview: Owlia, Arria 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 find 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 trans- CHCl CHCl. 1. London forces correct 2. London forces, dipole-dipole, hydrogen bonding 3. None of these 4. hydrogen bonding 5. dipole-dipole 6. London forces, dipole-dipole Explanation: C H Cl C H Cl is non-polar. 002 (part 1 of 2) 10 points Calculate the ratio of the potential energies for the interaction of a water molecule with an Al 3+ ion (of radius 53 pm) and with a Be 2+ ion (of radius 27 pm). 1. 0.63 2. . 39 correct 3. 0.24 4. 0.76 5. 0.52 6. None of these Explanation: r Al = 53 pm r Be = 27 pm The energy E p -| z | r 2 , so the ratio is E Al E Be = | z Al | r 2 Be | z Be | r 2 Al = | 3 | (27 pm) 2 | 2 | (53 pm) 2 = 0 . 389284 003 (part 2 of 2) 10 points Which ion will attract a water molecule more strongly? 1. Be 2+ correct 2. Al 3+ 3. Equal attraction Explanation: The attraction of the Be 2+ ion will be greater than that of the Al 3+ ion. Even though the Be 2+ ion has a lower charge, its radius is much smaller than that of Al 3+ , making the attraction greater. 004 (part 1 of 1) 10 points Which of the following cations is likely to be hydrated in compounds? 1. Li + correct 2. K + 3. NH + 4 4. Rb + 5. Cs + Explanation: Li + is the smallest. 005 (part 1 of 1) 10 points Owlia, Arria Homework 9 Due: Nov 6 2007, midnight Inst: Vandenbout 2 Which of the following compounds is UN- LIKELY to be commonly available and thus not found in the laboratory? 1. KCN 2H 2 O correct 2. La(NO 3 ) 3 6HO 3. CuSO 4 5H 2 O 4. BaCl 2 2H 2 O 5. Na 2 CO 3 10H 2 O 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 significant type of intermolecular forces in a liquid sample of fluoroform (CHF 3 )?...
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This note was uploaded on 05/01/2008 for the course CH 301 taught by Professor Fakhreddine/lyon during the Fall '07 term at University of Texas at Austin.

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HW9 S - Owlia, Arria Homework 9 Due: Nov 6 2007, midnight...

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