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Unformatted text preview: ctt253 Homework 6 Sparks (53535) 1 This printout should have 27 questions. Multiplechoice 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 : octahedral 2. sp 3 : trigonal pyramidal correct 3. sp 3 : trigonal planar 4. sp 3 d : octahedral 5. sp 3 : trapezoidal 6. sp 3 d : tetrahedral 7. sp 2 : tetrahedral 8. sp 2 : linear 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 What hybridization would you expect for Se when it is found in SeO 2 4 ? 1. sp 2. s 2 p 2 3. sp 3 correct 4. sp 2 5. p 6. spd 7. sp 3 d 8. sp 3 d 2 Explanation: N = 5 8 = 40 A = (6 5) + 2 = 32 S = 40 32 = 8 There are 8 shared or bonded electrons. The remaining electrons are placed around the O atoms. There are no lone pairs on the central Se atoms. This molecule has tetra hedral electronic and molecular geometry so there are 4 regions of high electron density. This corresponds to sp 3 hybridization. 003 10.0 points Give the hybridization of each central atom: nitrogen, middle carbon, right carbon. H N C HO C H H H b b 1. sp 2 , sp 3 , sp 3 2. sp 3 , sp 3 , sp 3 3. sp 2 , sp , sp 2 4. sp , sp , sp 5. sp 3 , sp 2 , sp 3 6. sp , sp 3 , sp 3 7. sp 2 , sp 2 , sp 3 correct 8. sp 2 , sp 2 , sp 2 Explanation: Hybridization is chosen based on the elec tronic geometry around the central atom, which is based on the number of RHED around the central atom. The RHED are three, three, and four. ctt253 Homework 6 Sparks (53535) 2 004 10.0 points A molecule has one lone pair of electrons on the central atom and three atoms bonded to the central atom. What is its electronic ar rangement and its hybridization? 1. pyramidal; sp 3 2. trigonal planar; sp 2 3. pyramidal; sp 2 4. trigonal planar; sp 3 5. angular; sp 3 6. tetrahedral; sp 3 correct 7. tetrahedral; sp 2 Explanation: One lone pair plus 3 bonded pairs equals 4 electronic regions. This means that the central atom is tetrahedral and hybridization is sp 3 . 005 (part 1 of 3) 10.0 points A A X X B C D For structure A, the electronic geometry is 1. linear. 2. trigonal bipyramidal. correct 3. angular....
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This note was uploaded on 03/19/2008 for the course CH 301 taught by Professor Fakhreddine/lyon during the Spring '07 term at University of Texas at Austin.
 Spring '07
 Fakhreddine/Lyon

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