SampleEx3 - Chem 6 sample exam 3(100 points total This is a...

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Chem 6 sample exam 3 (100 points total) @ This is a closed book exam to which the Honor Principle applies. @ The last page contains the MO energy level ordering for diatomic molecules, some electronegativity information, and the periodic table. You can detach it for easy reference. @ Please write clearly and SHOW YOUR WORK. If you need to write on the back of the exam paper, please indicate this clearly. @ Some questions are more challenging than others. Allot your time accordingly, and try to answer EVERY question. @ Please put your name both below and on p. 2. NAME (please print) ___________________________________________
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2 1. (10 pts, 2 each) Indicate whether or not each of the following molecules has a dipole moment. Briefly explain your answers. (a) CO (b) BBr 3 (c) BrF 3 (d) XeF 4 (e) PF 5
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3 2. (10 pts, 5 each) Give Lewis dot structures for the following molecules, including formal charges and resonance structures if necessary. Also, predict their idealized 3-dimensional structures, and describe qualitatively any deviations of the structures from the idealized predictions. (a) O 3 [atom connectivity is O-O-O] (b) BrF 5
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4 3 . (10 pts, 5 each) (a) GaSbCl 6 could exist either as [SbCl 2 ] + [GaCl 4 ] ( 1 ) or [GaCl 2 ] + [SbCl 4 ] ( 2 ). Give the 3-dimensional structure of the anions in both cases.
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