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Unformatted text preview: romasko (qrr58) Homework 5 sutcliffe (50985) 1 This print-out should have 22 questions. Multiple-choice 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