Quiz Chapter 1-2

Quiz Chapter 1-2 - CH 383 AY 2007-2008 A Hour 50 points...

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•• CH 383 AY 2007-2008 Name --------- A Hour Date ---------- 50 points Quiz Chapters 1-2 15 Minutes (24) 1. Consider fonnaldehyde (methanal), CH 2 0. a. Draw the Lewis (electron-dot) and the Keku1e (line-bond) structures. o "0' " . . C . . M' . It b. What is the hybridization ofthe C atom? c. What is the H-C-H bond angle? o .... /;<D d. What orbitals make up the carbon-hydrogen cr bond? e. What orbitals make up the carbon-oxygen 1t bond? f. What is the molecular shape of methanal? Tr-, J 0 "'a.A pi Ctnq . .. 1
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CH 383 Quiz 1 A Hour continued g. Convert the Kekule structure drawn for l.a. into a structure using the wedge, dashed- wedge, and line format to depict three-dimensional character of the molecule. ,..I ' . Vi) (II. I!' 'J I ". t , , ,. h. Convert the Kekule structure drawn for l.a. into a picture that shows all of the bonding orbitals (hybridized and unhybridized) in the molecule and how they overlap to form bonds. Indicate the name of each orbital and the type of bonds formed as a result of orbital overlap.~~) ~ . "A IT .' - .i v" ,v\. .~ --~, "( 1 ,. 'f ~(0~,//·\.-""ti/" :\ L_-~-"!--.~ '---. ..../ '..- . ... C" ....:.: e ~.~ 0(." ''if'' 11" (16) 2. Consider the carbonate anion C03 2-, a. Draw a Lewis structure of the carbonate anion, showing all lone pair electrons. G . . 'eJ " :0', \0: \ I G/ C '- \ ~.' /' ~ ,--,,~ . ........ c.. \ 'i '- ~"C?' ~O" .? :0;8 (3 . II , b. On the structure you drew in 2.a. above, use electron-pushing arrows to show the movement of electrons and generate two resonance forms of your original structure. CH383 AY 07-08 2 A Hour, Quiz 1
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CH 383 Quiz 1 A Hour continued c. On each of the structures you drew above, write all non-zero fonnal charges next to each atom in the structure. d. Do these structures differ in energy? Why or why not? () 0 ) cU) c..~ f 5 (.5 0. r( 5 h", r -(, e 1 ~ ~A I ') ~~ A-t1 I-J IT'''; (JC ~ e r S (;\ ( <. -1 ~ '2, J a. ry\,e, d \;\ e i() '( e \0 . . . q '( (~ (10) 3. Using your model kit, build the following model of phosgene (a chemical warfare agent) and present it to your professor for evaluation. Include lone pair electrons and proper
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This test prep was uploaded on 04/15/2008 for the course CH 383 taught by Professor Comitz during the Fall '08 term at West Point.

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Quiz Chapter 1-2 - CH 383 AY 2007-2008 A Hour 50 points...

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