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Unformatted text preview: Version 292 Exam 2 2008 Brodbelt (53765) 1 This printout should have 33 questions. Multiplechoice questions may continue on the next column or page find all choices before answering. The use of calculators, cell phones, and other electronic devices is prohibited on this exam. The term molecular geometry means molecular shape. GOOD LUCK! 001 10.0 points The letters in the periodic table are used to identify four different elements. A B C D Based on periodic table trends, which el ement is expected to have the GREATEST tendency to attract a shared pair of electrons? 1. D 2. A 3. C correct 4. B Explanation: Electronegativity (the ability to attract a shared pair of electrons) increases going to the right and upward in the periodic table. 002 10.0 points If a molecule has square planar molecular ge ometry, what must be its hybridization? 1. sp 2 2. sp 3 3. sp 4. sp 3 d 5. sp 3 d 2 correct Explanation: A molecule with square planar molecular geometry has octahedral electronic geometry which cooresponds to sp 3 d 2 hybridization. 003 10.0 points The C + cation has how many total electrons and how many valence electrons? 1. 7; 5 2. 5; 4 3. 5; 3 correct 4. 7; 8 5. 6; 6 6. 6; 3 7. 6; 4 8. 7; 6 9. 6; 5 Explanation: C + has lost an electron giving it 5 total and 3 valence electrons. 004 10.0 points The number of orbitals having the quantum numbers n = 6, = 2 and m = 1 is 1. 5. 2. 9. 3. 1. correct 4. 3. 5. 7. Explanation: Only one orbital will have this set of quan tum numbers. Where = 2, five values of m are possible, namely, 2, 1, 0, 1, and 2. Each one of these m values represents a single orbital. Version 292 Exam 2 2008 Brodbelt (53765) 2 005 10.0 points The Lewis dot structure of H 3 O + has (7, 8, 9) total electrons and (2, 3, 4) shared (bonded) pairs. 1. 8; 4 2. 9; 3 3. 7; 2 4. 8; 3 correct 5. 9; 4 6. 7; 4 7. 7; 3 8. 9; 2 9. 8; 2 Explanation: The total number of valence electrons is O 1 5 e = 5 e H 3 1 e = 3 e 8 e and the Lewis structure is O b b H H H + 006 10.0 points Which of the following correctly describes the Lewis dot structure for S + ? 1. two pairs of electrons, one lone electron 2. one pair of electrons, two lone electrons 3. two pairs of electrons, two lone electrons 4. three pairs of electrons 5. one pair of electrons, three lone electrons correct 6. three pairs of electrons, one lone electron 7. two pairs of electrons, three lone elec trons Explanation: S + is a sulfur atom with one electron removed. The electron configuration is [Ne] 3 s 2 3 p 3 , represented by bracketleftBigg S b b b b b bracketrightBigg + 007 10.0 points Atomic oxygen would most likely form its most stable monatomic ion when it 1. loses one electron....
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This note was uploaded on 09/13/2011 for the course CH 301 taught by Professor Fakhreddine/lyon during the Fall '07 term at University of Texas at Austin.
 Fall '07
 Fakhreddine/Lyon

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