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# hw6 - ctt253 Homework 6 Sparks(53535 This print-out should...

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ctt253 – Homework 6 – Sparks – (53535) 1 This print-out should have 27 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 : 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 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.

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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. 4. tetrahedral. 5. octahedral. 6. cubic. Explanation: Structure A has five regions of electron den- sity around the central atom, so its electronic geometry is trigonal bipyramidal.
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