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Midterm

chem_3351_first_hour_exam_key_fall_2016Exam


Department
Chemistry & Biochemistry
Course Code
CHEM 3351
Professor
All
Study Guide
Midterm

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Easily Legible Printed Name:______________________________
Page 1 of 6
HEM 3351 (100), Fall 2016
Professor Walba
First Hour Exam
September 20, 2016
scores:
1) 20
2) 20
3) 20
4) 20
5) 20
PLEASE read the questions very carefully!
PLEASE legibly print your name on each page of the exam.
H
He
Li
Be
B
C
N
O
F
Na
Mg
Al
Si
P
S
Ne
Cl
Ar
Br
I
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
35
53
1A
2A
3A
4A
5A
6A
7A
8A
CU Honor Code Pledge: On my honor, as a University of
Colorado at Boulder Student, I have neither given nor received
unauthorized assistance.
Signature: ______________________________________
Recitation TA Name: _____________________________
Recitation day and time: ___________________________
This is a closed-book exam. The use of notes, calculators, scratch
paper, or cell phones will not be allowed during the exam. You
may use models brought in a clear Ziploc bag. Please put all your
answers on the test in the appropriate place. Use the backs of the
pages for scratch (there are two additional blank scratch sheets
after the last page of the exam). DO NOT PUT ANSWERS ON
THE SCRATCH SHEETS.
Key

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Printed Name:
Page 2 of 6 Total points for this page: 20
1 (20 pts) a) For 2 methylbutane (structure shown at right), sighting down the C2-C3
bond, define the eclipsed conformation shown in the Newman projection on the energy
diagram below as having 0° dihedral angle.
Draw Newman projections of the three staggered conformations of 2-methylbutane,
sighting down the C2-C3 bond, in the boxes. Please rotate the back carbon clockwise moving from 0° to 60°,
180°, and 300°.
Complete the energy diagram by indicating the relative energy of all the conformations (eclipsed, staggered,
and everything in between) in the rotation from 0° to 360° = 0° using a smooth curve.
2
3
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