Chemistry 2213A Midterm: 2010 midterm with answers

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4 Oct 2015
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Chemistry 2213a Midterm Test, Fall 2010 Page 1
1. Which one of the following Lewis structures has a net negative charge?
A)
H C C C N
OH
H
B) HC C N H
H
H
O
H
C) H O C C N
H
H
D)
H O C C N H
HH
H
E)
HC C N H
H
H
O
2. How many of the following molecules are non-polar?
CO
2
CH
2
F
2
C
2
H
2
CH
2
O CH
3
OCH
3
A) 4
B) 3
C) 5
D) 2
E) 1
3. Shown on the right is the sedative phenobarbital.
Which statements about phenobarbital are correct?
1. It contains exactly one
sp
3
-hybridized carbon.
2. It contains two
sp
2
-hybridized nitrogens.
3. All carbon-carbon bond angles in the aromatic ring are 120°.
A) All statements are correct
B) 1 only
C) 1 and 3 only
D) 2 and 3 only
E) 2 only
N
N
O
O
O
H
H
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Chemistry 2213a Midterm Test, Fall 2010 Page 2
4. The ball-and-stick model shown below corresponds to which one of A – E?
A)
B)
C)
D)
E)
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Chemistry 2213a Midterm Test, Fall 2010 Page 3
5. The correct use of arrows is shown in which one of A – E?
A)
OO O2
B)
CH
3
OH CH
3
OH
2
+Cl
HCl
C) O
O
O
O
D)
HOH
2+H
2O
E)
O
O
+NH
3
NH
4
O
O
H
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Document Summary

H h: h o c c n h. Shown on the right is the sedative phenobarbital. Which statements about phenobarbital are correct: it contains exactly one sp3-hybridized carbon, it contains two sp2-hybridized nitrogens, all carbon-carbon bond angles in the aromatic ring are 120 . O: all statements are correct, 1 only, 1 and 3 only, 2 and 3 only, 2 only. Arrange the following in the order of increasing pka, from lowest to highest. Which one of the following equilibria lies furthest to the left: ch3cooh + nh2. When aspartame, shown below, is placed in an acidic environment, such as that of the stomach, which atom is protonated first: 1, 2, 3, 4, 5. Page 7: how many of the compounds listed below can exhibit cis-trans isomerism, 1,1,3-trichlorocyclohexane, 2-chloro-2-butene, 3-chloropropyne, 2,3-difluoropentane, none, 3, 4, 1, 2. The compound epi-aristolochene is found in pepper and tomato plants. How many hydrogen atoms does it contain: 24, 32, 20, 18, 16.

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