Exam02answers pg3 - 1. + correct 2. + 3. + 4. + 5. + 6. +...

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009 (part 1 of 1) 10 points A double bond in a compound like C 2 H 4 con- sists of 1. 2 pi bonds. 2. a sigma and a pi bond. correct 3. 2 sigma bonds. Explanation: 010 (part 1 of 1) 10 points Which of the following angles is the best de- scription of the O-O-O bond angle in O 3 (ozone)? 1. 90 2. 109.5 3. 107 4. 180 5. 120 6. 122 7. 117 correct Explanation: Ozone has 3 electron regions around the central oxygen (double bond, single bond, and a lone pair). This gives a trigonal planar electronic geometry from which to build. The bond angle starts out at 120 as any trigonal planar geometry would. HOWEVER! The lone pair electrons are MORE repulsive than the bonding pairs and therefore distorts the trigonal planar shape. The bond angle is squeezed slighly to a bond angle of 117 which is the BEST answer. 011 (part 1 of 1) 10 points Which of the following symbols is used to depict a partial positive charge?
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Unformatted text preview: 1. + correct 2. + 3. + 4. + 5. + 6. + Explanation: 012 (part 1 of 1) 10 points Which pair of bonded atoms has the largest dipole moment? 1. C N 2. C C 3. N N 4. C F correct 5. C O Explanation: Dipole moments result because of the dier-ence in electronegativity (EN) between bond-ing atoms. The bonds with the largest dipole will have the largest dierence 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 dierence in EN with C. Therefore, the C N bond has the largest dipole. 013 (part 1 of 1) 10 points The type of bonding which results in discrete molecules is 1. covalent. correct 2. ionic. 3. isotope....
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This note was uploaded on 01/23/2011 for the course CH 301 taught by Professor Fakhreddine/lyon during the Spring '07 term at University of Texas at Austin.

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