ch07 - padilla(tp5647 HW07 VSEPR shear(52375 This print-out...

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padilla (tp5647) – HW07: VSEPR – shear – (52375) 1 This print-out should have 20 questions. Multiple-choice questions may continue on the next column or page – fnd all choices beFore answering. DrRuth says: A table oF VSEPR structures will NOT be provided at the exam. You need to learn how to construct it or memorize it. You may want to take this homework closed book to see what areas you need to work on For the exam. 001 10.0 points Which symbol(s) in the periodic table Z X R Y P Q L represent elements having 7 valence electrons? 1. X and Z 2. Q 3. P and L correct 4. R 5. Y Explanation: The halogens Z X R Y P Q L have seven valence electrons. 002 10.0 points Which oF the Following is the correct Lewis Formula For boron trichloride (BCl 3 )? 1. Cl b b b b b b B Cl b b b b Cl b b b b b b 2. Cl B Cl Cl 3. b b b b b b Cl B Cl Cl 4. b b b b b b b b Cl B Cl Cl 5. b b b b b b b b b b b b Cl B Cl Cl 6. Cl B Cl Cl b b b b b b b b b b 7. Cl B Cl b b b b Cl 8. b b b b b b b b b b b b b b b b b b Cl B Cl Cl correct 9. b b b b b b b b b b b b b b b b b b b b Cl B Cl Cl 10. b b b b b b b b b b b b b b Cl B Cl Cl Explanation: B contributes 3 valence e and each Cl contributes 7 valence e For a total oF 24 e .
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padilla (tp5647) – HW07: VSEPR – shear – (52375) 2 B is a known exception to the octet rule and can form stable with 6 valence e : b b b b b b b b b b b b b b b b b b Cl B Cl Cl 003 10.0 points The basic fact that determines molecular shapes is that 1. nuclei attract electrons. 2. electrons attract each other. 3. nuclei attract each other. 4. nuclei repel each other. 5. electron pairs repel each other. correct Explanation: 004 10.0 points Which statement is false? 1. Lone pairs of electrons repel each other more strongly than they repel bonding pairs. 2. Lone pairs of electrons are considered a part of the description of the electronic geom- etry about a central atom. 3.
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This note was uploaded on 03/31/2010 for the course CH ch302 taught by Professor F during the Spring '09 term at University of Texas-Tyler.

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ch07 - padilla(tp5647 HW07 VSEPR shear(52375 This print-out...

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