HW06 solution_pdf

# HW06 solution_pdf - jung(jj23596 – H06 Geometries –...

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Unformatted text preview: jung (jj23596) – H06: Geometries – McCord – (53110) 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. 109.5 ◦ 2. 60 ◦ 3. 90 ◦ 4. 120 ◦ 5. 180 ◦ correct Explanation: 002 10.0 points What is the shape of COCl 2 ? 1. trigonal planar correct 2. seesaw 3. tetrahedral 4. trigonal pyramidal 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. NO − 3 2. I − 3 3. O 3 correct 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. 2; 1; 0; 0 2. 0; 0; 1; 1 3. 4; 0; 0; 0 4. 3; 0; 0; 1 5. 1; 0; 1; 0 6. 1; 1; 0; 1 correct 7. 0; 1; 1; 0 8. None of these 9. 0; 2; 0; 0 10. 2; 0; 0; 2 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 jung (jj23596) – H06: Geometries – McCord – (53110) 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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HW06 solution_pdf - jung(jj23596 – H06 Geometries –...

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