Exam 2-solutions - Version 129 Exam 2 sutcliffe (52380) 1...

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Unformatted text preview: Version 129 Exam 2 sutcliffe (52380) 1 This print-out should have 30 questions. Multiple-choice questions may continue on the next column or page find all choices before answering. 001 10.0 points Classify the molecule SiBr 4 . 1. polar molecule with polar bonds 2. nonpolar molecule with polar bonds cor- rect 3. nonpolar molecule with nonpolar bonds 4. polar molecule with nonpolar bonds Explanation: 002 10.0 points In the heteronuclear diatomic molecule OF, the antibonding molecular orbitals have 1. more fluorine-like atomic orbital charac- ter. 2. more oxygen-like atomic orbital charac- ter. correct 3. no electrons in them. 4. This molecule does not form any molecu- lar orbitals. Explanation: The bonding molecular orbitals reflect the more electronegative element F and the an- tibonding molecular orbitals reflect the less electronegative element O. 003 10.0 points What is the hybridization at the atom indi- cated by the arrow in the following molecule? H H H H C O O H O C O C H H H Acetylsalicylic acid (Aspirin) 1. sp 3 d 2 2. sp 3 d 3. sp 3 correct 4. sp 2 5. sp Explanation: The O has RHED = 4 so four hybrid or- bitals are needed. The hybridization sp 3 pro- vides 4 orbitals. 004 10.0 points Draw the Lewis dot structure for SF 4 . How many lone pairs of electrons are on the central atom? 1. 4 2. 1 correct 3. 3 4. 5. 2 Explanation: S has 6 valence e F has 4 ( 7 valence e ) Total = 34 e Version 129 Exam 2 sutcliffe (52380) 2 S F b b b b b b F b b b b b b F b b b b b b F b b b b b b b b has 34 e and S is a known exception to the octet rule so the structure is correct as drawn. There is 1 lone pair on S, the central atom. 005 10.0 points A bond 1. always exists in conjunction with a bond. correct 2. may correspond to several fruit flavors. 3. is composed of antibonding orbitals. 4. leads to low dipole moments. 5. stems from sp 3 hybridzation of orbitals. Explanation: 006 10.0 points Draw the Lewis structure for the molecule containing two H and one Se atoms. How many single bonds, double bonds, triple bonds, and unshared pairs of electrons are on the central atom, in that order? 1. 3, 0, 0, 1 2. None of these 3. 1, 1, 0, 1 4. 0, 0, 1, 1 5. 0, 2, 0, 0 6. 2, 0, 0, 2 correct 7. 2, 1, 0, 0 8. 4, 0, 0, 0 9. 0, 1, 1, 0 10. 1, 0, 1, 0 Explanation: Se has 6 valence electrons; H has one va- lence electron: b b b b b b Se b H Total number of valence electrons: Se 1 6 e = 6 e H 2 1 e = 2 e 8 e Thus the Lewis dot structure is b b b b b b b b H Se H and the central atom has 2 single bonds and two unshared electron pairs. 007 10.0 points For dinitrogen monoxide, the arrangement of the atoms is N-N-O. In the Lewis structure with the single bond N N and the triple bond N O, what are the formal charges on N, N, and O, in order from left to right?...
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This note was uploaded on 10/20/2011 for the course CH 301 taught by Professor Fakhreddine/lyon during the Fall '07 term at University of Texas at Austin.

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Exam 2-solutions - Version 129 Exam 2 sutcliffe (52380) 1...

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