HW-6 - Rahman, Tarique Homework 6 Due: Oct 9 2007, midnight...

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Unformatted text preview: Rahman, Tarique Homework 6 Due: Oct 9 2007, midnight Inst: Vandenbout 1 This print-out should have 23 questions. Multiple-choice questions may continue on the next column or page find all choices before answering. The due time is Central time. Here are more questions finishing up Chap- ter 13 and starting Chapter 14. Remember, the HWS could be overloaded with the actual due time arrives Tuesday night. 001 (part 1 of 1) 10 points Consider a 3-atom molecule A B A for which B has a total of only four valence elec- trons enough to make two bonds. Predict the A-B-A bond angle. 1. 120 2. 90 3. 109.5 4. 180 correct 5. 60 Explanation: 002 (part 1 of 1) 10 points Consider the compound peroxyacetylni- trate, an eye irritant in smog. O N C O O O O CH 3 O Predict the indicated bond angle. 1. 109.5 2. 120 correct 3. 90 4. 30 5. 60 Explanation: 003 (part 1 of 2) 10 points Draw the Lewis structure for NO- 2 . How many single bonds, double bonds, triple bonds, and unshared pairs of electrons are on the central atom, in that order? 1. 2; 1; 0; 0 2. 0; 2; 0; 0 3. 1; 0; 1; 0 4. 2; 0; 0; 2 5. 0; 1; 1; 0 6. 4; 0; 0; 0 7. 0; 0; 1; 1 8. 1; 1; 0; 1 correct 9. 3; 0; 0; 1 10. None of these Explanation: N has 5 valence electrons and O has 6 va- lence electron. The total number of valence electrons in the ion (plus one to account for the ions negative charge) is 5 + (2 6) + 1 = 18 The Lewis structure for NO- 2 can be found by connecting the oxygen atoms to nitrogen and placing eight electrons around each atom: O N O - and the central atom has one single bond, one double bond, and one unshared pair of electrons. 004 (part 2 of 2) 10 points Determine the molecular geometry of the ion NO- 2 . Rahman, Tarique Homework 6 Due: Oct 9 2007, midnight Inst: Vandenbout 2 1. trigonal-bipyramidal 2. trigonal-pyramidal 3. octahedral 4. bent or angular correct 5. trigonal-planar 6. tetrahedral 7. None of these 8. linear Explanation: The central atom N has 2 bonding regions and 1 lone pair of electrons. The three areas of high electron density make the electronic geometry trigonal planar and the molecular geometry bent or angular:...
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HW-6 - Rahman, Tarique Homework 6 Due: Oct 9 2007, midnight...

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