Exam02answers - Cheung, Anthony Exam 2 Due: Oct 18 2006,...

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Cheung, Anthony – Exam 2 – Due: Oct 18 2006, 1:00 pm – Inst: McCord 1 This print-out should have 25 questions. Multiple-choice questions may continue on the next column or page – fnd all choices beFore answering. The due time is Central time. 001 (part 1 oF 2) 10 points What is the expected bond order For the diatomic species B + 2 ? 1. 2 2. 1 2 correct 3. 1 4. 3 5. 3 2 6. 4 Explanation: BO = 2 + 1 - 2 2 = 1 2 2 p σ * 2 p π * 2 p σ 2 p π 2 p 2 p ↑↓ 2 s ↑↓ σ * 2 s ↑↓ σ 2 s ↑↓ 2 s 002 (part 2 oF 2) 10 points What is the magnetism and number oF un- paired electrons oF B + 2 ? 1. paramagnetic; 4 2. paramagnetic; 3 3. paramagnetic; 2 4. paramagnetic; 1 correct 5. diamagnetic Explanation: 003 (part 1 oF 1) 10 points Consider the Following covalent bond radii: Single Double Triple C 77 pm 67 pm 60 pm N 75 pm 60 pm 55 pm O 74 pm 60 pm - S 102 pm - - What is the approximate length oF the CN bond in OC(NH 2 ) 2 (urea) using the table val- ues? 1. 179 pm 2. 127 pm 3. 120 pm 4. 142 pm 5. 115 pm 6. 152 pm correct 7. 135 pm Explanation: Urea has a single C N bond, so C + N = 77 pm + 75 pm = 152 pm 004 (part 1 oF 1) 10 points What would be the expected carbon-carbon- chlorine angle in the compound dichloroacety- lene (C 2 Cl 2 )? 1. 180 correct
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Cheung, Anthony – Exam 2 – Due: Oct 18 2006, 1:00 pm – Inst: McCord 2 2. 90 3. 120 4. 109.5 5. 150 Explanation: 005 (part 1 of 1) 10 points What hybridization would you expect for the carbon atoms in the cyclic compound benzene (C 6 H 6 )? 1. sp 2 correct 2. sp 3 3. sp 3 d 2 4. sp 3 d 5. sp Explanation: In each carbon one s orbital and two p or- bitals hybridize to produce three sp 2 orbitals which form sigma bonds between the carbons and between carbon and hydrogen. The re- maining p orbitals form pi bonds between the carbons. 006
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This note was uploaded on 11/11/2010 for the course CH 301 taught by Professor Fakhreddine/lyon during the Fall '07 term at University of Texas at Austin.

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Exam02answers - Cheung, Anthony Exam 2 Due: Oct 18 2006,...

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