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Feb. 9 HW-solutions - chauhan(mmc2762 Feb 9 HW sparks(51150...

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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 10.0points 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 10.0points Which of the following is the best represen- tation of the compound calcium fluoride? 1. 2 Ca + , bracketleftbigg F bracketrightbigg 2 - 2. None is appropriate because calcium flu- oride is a covalent compound. 3. 3 Ca 2+ , 2 bracketleftbigg F bracketrightbigg 3 - 4. Ca + , bracketleftbigg F bracketrightbigg - 5. Ca 2+ , bracketleftbigg F bracketrightbigg 2 - 6. Ca 2+ , 2 bracketleftbigg F bracketrightbigg - correct Explanation: 003 10.0points The correct name for the compound NH 4 CN is 1. nitrogenhydrogencarbon nitride. 2. nitrogen-hydrocyanic acid. 3. ammonium cyanate. 4. ammonium carbon nitride. 5. ammonium cyanide. correct Explanation: NH 4 CN is an ionic compound, held to- gether by the attraction of opposite charges.
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