HW07-VSEPR-POLARITY-VB-solutions - parga (jrp3484) –...

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Unformatted text preview: parga (jrp3484) – HW07-VSEPR-POLARITY-VB – vandenbout – (51335) 1 This print-out should have 33 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. 001 10.0 points Consider the structural formula OH of phenol, the active ingredient in some oral anesthetics used in “sore-throat sprays.” What is the molar mass of phenol? 1. 94 g/mol correct 2. 50 g/mol 3. 89 g/mol 4. 17 g/mol Explanation: Remember that the shorthand notation means a phenyl group C 6 H 5 . The chemical formula is C 6 H 5 OH 002 10.0 points This is the condensed structural formula for acetaminophen, the active ingredient in the over-the-counter medication Tylenol. OH C CH 3 O N H What is the molecular formula of ac- etaminophen? 1. C 8 H 9 NO 2 correct 2. C 8 H 11 NO 2 3. C 8 H 8 NO 4. C 8 H 5 NO 2 Explanation: Remember that the shorthand notation means C 6 H 5 003 10.0 points This structure C C C C C C C C is the carbon skeleton for a structural isomer of octane with the hydrogen atoms omitted. What is the molecular formula of this isomer? 1. C 8 H 18 correct 2. C 8 H 24 3. C 8 H 8 4. C 8 H 17 Explanation: The structure is C H H H C C H C H H C H H H C H H H C H H H C H H H 004 10.0 points Consider the structure parga (jrp3484) – HW07-VSEPR-POLARITY-VB – vandenbout – (51335) 2 C CH 3 O O S CH 2 C C CH 2 CH 2 CH 2 CH 3 of a COX-2 inhibitor. How many single bonds, double bonds, and triple bonds are represented by this condensed formula? 1. 31 single, 4 double, 1 triple correct 2. 31 single, 3 double, 1 triple 3. 13 single, 3 double, 1 triple 4. 13 single, 4 double, 1 triple Explanation: The benzene ring can be shown as C C C C C C H H H H H H 005 10.0 points The electronegativity of H is 1. a lot less than that of C. 2. a lot more than that of C. 3. about equal to that of C. correct Explanation: 006 10.0 points Which pair of bonded atoms has the largest dipole moment? 1. N N 2. C O 3. C C 4. C F correct 5. C N Explanation: Dipole moments result because of the differ- ence in electronegativity (EN) between bond- ing atoms. The bonds with the largest dipole will have the largest difference in EN. EN in- creases from bottom to top and left to right on the periodic table. C C and N N have the same EN, so there is no dipole moment. Between N, O, and F, F is the most EN, and has the largest difference in EN with C. Therefore, the C N bond has the largest dipole. 007 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. 180 ◦ correct 2. 90 ◦ 3. 60 ◦ 4. 109.5 ◦ 5. 120 ◦ Explanation: 008 10.0 points What is the shape of COCl 2 ?...
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