Name:_____________
Chemistry 114
First Hour Exam
Remember- Show all work for partial credit
1. (30 points) for each of the following molecules determine the:
a. Lewis Structure, b. hybridization of central atom, c. Bond Angle around Central atom, d.
Geometry of MOLECULE, and e. Polarity
CF4
b
c
d
e
OF2
a
a
sp3
109
tetrahedral
nonpolar
b sp3
c 109
d V-shaped
e Polar
BeH2
a
b
c
d
e
AsF5
a
sp2
180
linear
Nonpolar
b dsp3
c 90 and 120
d trigonal bipyramid
e nonpolar
KrF 4
b
c
d
e
IF3
a
a
d2dp3
90
square planar
nonpolar
b dsp3
c 90
d T-shaped
e Polar
2
2. (20 points) Give a molecular orbital energy-level diagram for Be2+, and CNBased on this diagram predict the bond order and magnetism of this material.
Be2+
F*2s
F2s
CNF*2p
B*2p
F2p
89
B2p
89 89
F*2s
89
F2s
89
BO = (8-2)/2=3
Diamagnetic
8
89
BO = (2-1)/2 = .5
paramagnetic
3. (10 points) Name the following hydrocarbons:
CH3
CH3
CH2
CH3
HC CH2CH
H3C CH2
CH3
H3C
2,4-dimethylhexane
3-ethyl-1-methylcyclopentane
H3C
H 3C
H 3C
F
CH 3
2-methyl-2-butene
(No cis or trans)
1-fluoro-4 methylbenzene
4-fluoro-1-methylbenene
p-fluorotoluene, and others
H3C
H
H
CH2CH3
trans-2-pentene
3
4. (10 points) Give the structures of the following hydrocarbons:
2,2,4,4-tetramethylpentane
CH3
2,4-heptadiene
CH3
H 3C C
H
CH3 3C C 7C CH3
1
H
CH3 2 CH3
3-ethyl-4-decene
H3C
H2
C
H
C
H2C
C
H
C C C C C CH 3
H H H H2 H2
trans-2-butene
H2
C
C
H2
H2
C
C
H2
H2
C
H
CH3
H3C
CH3
H
CH3
para-dinitrobenzene
NO2
NO2
5. (10 points) Give an example of an addition reaction and a substitution reaction. Which
reaction occurs in alkanes? Alkene? Alkynes? Armomatic hydrocarbons
Substitution: CH3-CH3 + Cl2 6 CH3CH2Cl + HCL
Addition : CH2=CH2 + Cl2 6 CH2Cl-CH2Cl
Addition only occurs in alkenes and alkynes. Substitution occurs in alkanes and
aromatic hydrocarbons, and, if you want to get technical, the unsaturated portion of alkenes
and alkynes as well.
4
6. (10 points) Identify the various common functional groups in the following compounds
COOH
OH H
HO
C C
H
H
HO
N CH3
H
O C CH3
O
Epinephirine
OH - alcohol
-NH- Amine
you could also highlight the benzene ring
as an aromatic group
Aspirin
COOH carboxylic acid
Aromatic ring
O-C=O ester
8. (10 points) One of the plastics I recycle is #2, HDPE. HDPE stands for High Density
Polyethylene. Given that this is a specific form of the plastic polyethylene, give the
structure of monomer and the polymer for this plastic
H
H
Ethylene
H
H
H H H
H
H H H
H
Polyethylene