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Unformatted text preview: romasko (qrr58) Homework 5 sutcliffe (50985) 1 This printout should have 22 questions. Multiplechoice questions may continue on the next column or page find all choices before answering. Questions 1 through 13 deal with VB the ory, the rest with MO theory. 001 10.0 points Which of the following combinations of hy bridization and molecular geometry is possi ble? 1. sp 3 d : tetrahedral 2. sp 3 : trigonal pyramidal correct 3. sp 2 : tetrahedral 4. sp 2 : linear 5. sp 3 : trigonal planar 6. sp 3 : octahedral 7. sp 3 d : octahedral 8. sp 3 : trapezoidal Explanation: Use the hybridization to confirm the elec tronic geometry; e.g. , sp 2 means three hybrid orbitals, three RHED and a trigonal planar electronic geometry. Verify if the molecular geometry is possible for the given electronic geometry: for exam ple, for trigonal planar electronic geometry, only trigonal planar and bent are possible. 002 10.0 points The sp 3 hybridization has what percent s character and what percent p character? 1. 50%; 50% 2. 75%; 25% 3. 25%; 75% correct 4. 67%; 33% 5. 33%; 67% Explanation: s = 1 4 = 25% p = 3 4 = 75% 003 10.0 points A molecule AB 3 has eight shared electrons and follows the normal octet rule. The central atom is A. The atoms surrounding A are represented by B. Pick the true statement. 1. It is a polar molecule. 2. It has one lone pair of electrons on A. 3. It must be an anion. 4. It has linear molecular shape. 5. It is sp 3 hybridized. 6. It has two single bonds and two double bonds. 7. It exhibits resonance. correct Explanation: The structure for AB 3 is A B B B A molecule exhibits resonance if more than one Lewis structure can be drawn. In this case the double bond could be between the central atom and any of the B atoms. 004 10.0 points Carbon has a valence of four in nearly all of its compounds and can form chains and rings of C atoms. Consider the propyne structure. romasko (qrr58) Homework 5 sutcliffe (50985) 2 C C H H H C H a b c What hybridizations would you expect for the carbon atoms identified by a, b, and c, respectively? 1. sp 3 , sp, sp 3 2. sp 3 , sp 2 , sp 3 3. sp 3 , sp 3 , sp 2 4. sp 2 , sp, sp 2 5. sp 2 , sp, sp 6. sp 2 , sp 2 , sp 3 7. sp 3 , sp, sp correct Explanation: C C H H H C H sp 3 sp sp 005 (part 1 of 3) 10.0 points Consider the Lewis structures for H...
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This note was uploaded on 06/07/2011 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
 Chemistry

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