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ochem homeworks sp11 key -10

ochem homeworks sp11 key -10 - Sessler CH310M/318M Homework...

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Sessler CH310M/318M Homework Problem Set 1 Due Friday January 28, 2011 2 1. Draw the Lewis dot structures for the following molecules and ions. Use lines for bonds and dots for lone pairs of electrons. a. CH 3 CO 2 H b. CH 3 CH 2 OH c. CO 3 2- d. NO 3 - e. SO 4 2- f. NH 4 + 2. For each molecule draw an arrow ( ) next to each polar covalent bond to show the direction of polarity for that bond. Then under each molecule draw another arrow to show the overall dipole moment for the entire molecule. Write “0” if no overall dipole moment exists. a. b. c. d. e. f. “0” “0”

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Sessler CH310M/318M Homework Problem Set 1 Due Friday January 28, 2011 3 3. Draw reasonable resonance structures for each of the molecules shown below. Use curved arrows to show the flow of electrons. Be sure to include all charges! Circle the major contributor and in one sentence, explain your choice. a. enolate anion Negative charge on a more electronegative atom (here: oxygen) b. Negative charge on a more electronegative atom (here: oxygen) c. - Filled valence shells - Maximum number of covalent bonds
Sessler CH310M/318M Homework Problem Set 1 Due Friday January 28, 2011 4 4. Acesulfame potassium is a calorie-free artificial sweetener, accidentially discovered in 1967 by the German chemist Karl Clauss at Hoechst AG. It is marketed under the trade names Sunett and Sweet One. For each letter, indicate the hybridization, the expected geometry and bond angles. a. b. hybridization:_____ sp 3 ______ hybridization:______ sp 2 _______ geometry:____ tetrahedral ___ geometry:____ trigonal-planar __ bond angle:_____ 109.5 _____ bond angle:_______ 120° ______ c. d. hybridization:______ sp 2 _______ hybridization:______ sp 2 _______ geometry:____ trigonal-planar __ geometry:____ trigonal-planar __ bond angle:_______ 120° ______ bond angle:_______ 120° ______

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Sessler CH310M/318M Homework Problem Set 1 Due Friday January 28, 2011 5 5. Determine the overall charge for each of the following molecules/ions and write it in the box. Then draw the Lewis line structures below. Use lines for bonds and dots for lone pairs of electrons. Also where appropriate indicate any formal charges ( and ) on the correct atoms. 6. Morphine is a potent opiate anagesic medication and is considered to be a prototypical opioid. a. Circle and identify at least five different functional groups in morphine. b. Provide the molecular formula for the above molecule:__________ C 17 H 19 NO 3 ___________
Sessler CH310M/318M Homework Problem Set 1 Due Friday January 28, 2011 6 7. Use VSEPR to predict bond angles about each highlighted atom (Partially taken from text problem 1.38). Use the line provided under each arrow for your final answer. a. b. c. d. e. f. g. h.

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Sessler CH310M/318M Homework Problem Set 2 Due Friday February 4, 2011 2 1. Each line in a molecular orbital diagram represents an orbital for a second row element. We use these schemes to show the addition of atomic orbitals that result in molecular orbitals..
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