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H07- Geometries-solutions

H07- Geometries-solutions - truitt(wtt255 H07 Geometries...

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truitt (wtt255) – H07: Geometries – mccord – (50970) 1 This print-out should have 24 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. 001 10.0 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. 109.5 3. 60 4. 180 correct 5. 90 Explanation: 002 10.0 points What is the shape of COCl 2 ? 1. trigonal planar correct 2. trigonal pyramidal 3. seesaw 4. T-shaped 5. tetrahedral Explanation: There are three regions of electron density (with no lone pairs) around the central atom: C Cl Cl O 003 10.0 points Which of the following has bond angles slightly LESS than 120 ? 1. O 3 correct 2. NO 3 3. I 3 4. SF 2 5. SO 3 Explanation: While SO 3 and O 3 have three regions of electron density around the central atom, only O 3 has a lone pair in one of these regions. The lone pair repels the other bonds more, which makes their angle slightly less than 120 . 004 (part 1 of 2) 10.0 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. None of these 2. 0; 2; 0; 0 3. 0; 1; 1; 0 4. 2; 0; 0; 2 5. 0; 0; 1; 1 6. 1; 1; 0; 1 correct 7. 4; 0; 0; 0 8. 1; 0; 1; 0 9. 3; 0; 0; 1 10. 2; 1; 0; 0 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 ion’s negative charge) is
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truitt (wtt255) – H07: Geometries – mccord – (50970) 2 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: bracketleftbigg O N O bracketrightbigg and the central atom has one single bond, one double bond, and one unshared pair of electrons. 005 (part 2 of 2) 10.0 points Determine the molecular geometry of the ion NO 2 . 1. tetrahedral 2. bent or angular correct 3. None of these 4. trigonal-pyramidal 5. trigonal-bipyramidal 6. trigonal-planar 7. octahedral 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
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