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Unformatted text preview: sakerwalla (hs9229) – H08 : VSEPR – mccord – (50960) 1 This print-out should have 31 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. 001 10.0 points Which of the following statements about po- larity is false? 1. Lone (unshared) pairs of electrons on the central atom play an important role in influ- encing polarity. 2. CCl 4 is a polar molecule. 3. Linear molecules can be polar. 4. Dipole moments can “cancel”, giving a net non-polar molecule. 5. Polar molecules must have a net dipole moment. 002 10.0 points Which of the following molecules is nonpolar? 1. H 2 O 2. SO 2 3. NF 3 4. CH 3 Br 5. BF 3 003 10.0 points CHF 3 is (less,more) polar than CHI 3 because 1. less; the tetrahedral geometry decreases the polarity of C-F bonds. 2. less; the three polar C-F bonds are sym- metrical and cancel the dipole moments. 3. more; the C-H bond in CHF 3 is a non- polar bond. 4. more; the C-F bonds are more polar than the C-I bonds. 5. less; the C-H bond in CHF 3 is a non-polar bond. 004 10.0 points Which of the molecules I) B Cl b b b b b b Cl b b b b b b Cl b b b b b b II) O b b b b C O b b b b III) O b b b b H H contains polar covalent bonds but is NOT itself a polar molecule? 1. I only 2. All fit the criteria. 3. None fit the criteria. 4. II and III only 5. I and III only 6. II only 7. I and II only 8. III only 005 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. 60 ◦ 2. 90 ◦ 3. 120 ◦ sakerwalla (hs9229) – H08 : VSEPR – mccord – (50960) 2 4. 109.5 ◦ 5. 180 ◦ 006 10.0 points What is the shape of COCl 2 ?...
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This note was uploaded on 10/25/2011 for the course CHEM 301 taught by Professor Millburn during the Spring '11 term at The University of Texas at San Antonio- San Antonio.
- Spring '11