HW 7 - johnson (mjj622) H07: Geometries mccord (50970) 1...

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Unformatted text preview: johnson (mjj622) 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. tetrahedral 3. trigonal pyramidal 4. seesaw 5. T-shaped Explanation: There are three regions of electron density (with no lone pairs) around the central atom: C Cl b b b b b b Cl b b b b b b O b b b b 003 10.0 points Which of the following has bond angles slightly LESS than 120 ? 1. SO 3 2. I 3 3. O 3 correct 4. SF 2 5. NO 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. 0; 2; 0; 0 2. 4; 0; 0; 0 3. 0; 0; 1; 1 4. None of these 5. 0; 1; 1; 0 6. 1; 0; 1; 0 7. 2; 0; 0; 2 8. 2; 1; 0; 0 9. 3; 0; 0; 1 10. 1; 1; 0; 1 correct 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 johnson (mjj622) 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 b b b b b b b b N b b b b O b b b b b b 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 ....
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HW 7 - johnson (mjj622) H07: Geometries mccord (50970) 1...

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