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Homework 5-solutions

# Homework 5-solutions - dewitt(aad777 Homework 5...

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dewitt (aad777) – Homework 5 – sutcliffe – (52380) 1 This print-out should have 20 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. 001 10.0 points Which of the following combinations of hy- bridization and molecular geometry is possi- ble? 1. sp 3 : trigonal pyramidal correct 2. sp 3 : trapezoidal 3. sp 3 d : octahedral 4. sp 3 : octahedral 5. sp 2 : linear 6. sp 2 : tetrahedral 7. sp 3 : trigonal planar 8. sp 3 d : tetrahedral 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. 33%; 67% 2. 25%; 75% correct 3. 67%; 33% 4. 75%; 25% 5. 50%; 50% 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 has one lone pair of electrons on A. 2. It has two single bonds and two double bonds. 3. It must be an anion. 4. It is a polar molecule. 5. It exhibits resonance. correct 6. It is sp 3 hybridized. 7. It has linear molecular shape. 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 allene structure. C C H H C H H a b c What hybridizations would you expect for the carbon atoms identified by a, b, and c,

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dewitt (aad777) – Homework 5 – sutcliffe – (52380) 2 respectively? 1. sp 2 , sp, sp 2 correct 2. sp 2 , sp, sp 3. sp 3 , sp, sp 4. sp 3 , sp 2 , sp 3 5. sp 3 , sp, sp 3 6. sp 2 , sp 2 , sp 3 7. sp 3 , sp 3 , sp 2 Explanation: C C H H C H H sp 2 sp sp 2 005 (part 1 of 3) 10.0 points Consider the Lewis structures for H 2 CCH 2 , H 2 C C
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