Exam 2-solutions

Exam 2-solutions - Version 009 Exam 2 sutcliffe (90830)...

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Version 009 – Exam 2 – sutclife – (90830) 1 This print-out should have 25 questions. Multiple-choice questions may continue on the next column or page – Fnd all choices be±ore answering. 001 10.0 points Which o± the ±ollowing is the correct Lewis ±ormula ±or thio±ormaldehyde (CH 2 S)? 1. HC SH 2. H C S H 3. HCS H 4. H 5. H 6. H 7. SC H H 8. H 9. S H correct 10. H Explanation: The Lewis ±ormula ±or thio±ormaldehyde (CH 2 S) is S H 002 10.0 points What is the hybridization at the atom indi- cated by the arrow in the ±ollowing molecule? H H H H C O · · · · O ·· H O C O · · C H H H Acetylsalicylic acid (Aspirin) 1. sp 2 2. sp 3. sp 3 d 4. sp 3 correct 5. sp 3 d 2 Explanation: The O has RHED = 4 so ±our hybrid or- bitals are needed. The hybridization sp 3 pro- vides 4 orbitals. 003 10.0 points
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Version 009 – Exam 2 – sutclife – (90830) 2 What is the hybridization oF the central atom in Xe± 4 ? 1. sp 2. sp 2 3. sp 3 d 4. sp 3 d 2 correct 5. sp 3 Explanation: 004 (part 1 of 2) 10.0 points ±or these next two questions assume the octet rule is strictly obeyed. Draw the Lewis structure For SCl 2 .H o w many single bonds, double bonds, triple bonds, and unshared pairs oF electrons are on the central atom, in that order? 1. None oF these 2. 1, 1, 0, 1 3. 0, 2, 0, 0 4. 1, 0, 1, 0 5. 0, 0, 1, 1 6. 0, 1, 1, 0 7. 4, 0, 0, 0 8. 3, 0, 0, 1 9. 2, 0, 0, 2 correct 10. 2, 1, 0, 0 Explanation: Shas6va lencee lectronsandC lhas7va - lence electrons. The total number oF valence electrons in the molecule is 6+(2 × 7) = 6 + 14 = 20 The Lewis structure For SCl 2 is Cl S Cl and the central atom has 2 single bonds and 2 pairs oF unshared electrons. 005 (part 2 of 2) 10.0 points Determine the molecular geometry oF the molecule SCl 2 . 1. tetrahedral 2. bent or angular correct 3. octahedral 4. trigonal-bipyramidal 5. linear 6. None oF these 7. trigonal-pyramidal 8. trigonal-planar Explanation: The central atom has 2 bonding pairs and 2 lone pairs oF electrons. The Four areas oF high electron density make the electronic geometry tetrahedral and the molecular geometry bent or angular. S Cl Cl 006 10.0 points The smallest bond angles would be Found in a compound with which oF the Following molec- ular geometry? 1. square planar correct 2. trigonal planar 3. linear
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Version 009 – Exam 2 – sutclife – (90830) 3 4. tetrahedral 5. angular Explanation: Square planar molecular geometry has bond angles oF 90 degrees. Trigonal planar molecular geometry has bond angles oF 120 degrees.
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This note was uploaded on 02/12/2012 for the course CH 301 taught by Professor Fakhreddine/lyon during the Summer '07 term at University of Texas.

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Exam 2-solutions - Version 009 Exam 2 sutcliffe (90830)...

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