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Unformatted text preview: chauhan (mmc2762) – Feb. 9 HW – sparks – (51150) 1 This print-out should have 13 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. Preview chapter 13 sections 7 and 9-12 be- fore next class. 001 10.0 points The Lewis dot structure for an isolated arsenic atom has 1. one pair of electrons and three lone elec- trons. correct 2. four pairs of electrons. 3. two pairs of electrons and one lone elec- tron. 4. five lone electrons. 5. three pairs of electrons and one lone elec- tron. Explanation: The electron configuration of As is [Ar]4 s 2 3 d 10 4 p 3 By Hund’s rule, degenerate orbitals are first filled singly before pairing up electrons with opposite spins. Note that electrons in d or- bitals are not shown in Lewis structures. 002 10.0 points Which of the following is the best represen- tation of the compound calcium fluoride? 1. 2 Ca + , bracketleftbigg F b b b b b b b b bracketrightbigg 2- 2. None is appropriate because calcium flu- oride is a covalent compound. 3. 3 Ca 2+ , 2 bracketleftbigg F b b b b b b b b bracketrightbigg 3- 4. Ca + , bracketleftbigg F b b b b b b b b bracketrightbigg- 5. Ca 2+ , bracketleftbigg F b b b b b b b b bracketrightbigg 2- 6. Ca 2+ , 2 bracketleftbigg F b b b b b b b b bracketrightbigg- correct Explanation: 003 10.0 points The correct name for the compound NH 4 CN is 1. nitrogenhydrogencarbon nitride....
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This note was uploaded on 04/03/2012 for the course CHEM 56920 taught by Professor Sparks during the Spring '12 term at University of Texas at Austin.
- Spring '12