Midterm1-Ternansky-Fall04

Midterm1-Ternansky-Fall04 - Chemistry 140A Fall, 2004 NAME:...

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Chemistry 140A Fall, 2004 First Midterm Exam-200 points 10/19/04 NAME: Ima Key 1. (10 points) Draw the Lewis dot structure for the nitro group (NO 2 - ) Be sure to draw all valence electrons and indicate charges where appropriate. (Chapter 1; #28d) N O O (-) (10 pts) N O O (-) (-) (+) (8 pts) 2. (16 pts; 6 pts. each contributor ) Draw two resonance structures for the following molecule. Label your resonance contributors "A" and "B". Indicate which of your resonance contributors is better and give one reason why it is better. N C N (+) (-) C N (+) (-) N C N (+) (-) N (+) (-) N N (-) (+) A B C D E
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(2 points) Better resonance contributor: E>A>B>D>C (2 points) Reason: for E: charges properly located; minimize charge separation 3. (13 points) Draw all possible atomic energy orbital levels from 1s through and including 3d listing them from lowest energy to highest. Next, fill in the electrons for boron. Correct orbitals listed and correct # of each: 4 points Correct energy level positioning: 4 points Correct electron palcement for Boron: 5 points E 1s 2s 2p 3s 4s 3p 3d
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Midterm1-Ternansky-Fall04 - Chemistry 140A Fall, 2004 NAME:...

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