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CHEM 1412 Practice Exam 4 (Chapters 21, & 23)
F
= 96485 J/V mol = 96485 C/mol of eG = –n F E°cell
Amp = C/sec

E = E° – (0.0592/n) log Q
G = –RTlnKeq
R = 8.314 J/mol K
mass of proton = 1.007276470 amu
lnNt = –kt + lnNo
c = 2.998 X 108 m/s
mass of neutron = 1.008664904 amu
A periodic table is also attached.
1.
2.
Alpha particles are identical to
A.
protons.
B.
helium atoms.
C.
hydrogen atoms.
D.
helium nuclei.
E.
electrons.
Predict the other product of the following nuclear transformation.
A.
B.
C.
D.
E.
3.
When atoms of beryllium-9 are bombarded with alpha particles, neutrons are
produced.
What new isotope is also formed?
A.
B.
C.
D.
E.
4.
In the
decay series there are six radioisotopes that decay by alpha emission,
including Th-232
itself, and four radioisotopes that decay by beta emission. The final product
of this series is a stable
isotope. The symbol for this product is
A.
B.
C.
D.
E.
5.
Sulfur-35 decays by beta emission. The decay product is
A.
B.
C.
D.
E.
6.
The only stable isotope of iodine is iodine-127. Predict the mode of decay of
A.
alpha emission
B.
beta emission
.
7.
8.
9.
C.
positron emission
D.
electron capture
Carbon-11 is a radioactive isotope of carbon. Its half-life is 20.3 minutes.
What fraction of the initial
number of carbon-11 atoms in a sample will remain after 81 minutes?
A.
1/16
B.
1/4
C.
1/2
D.
1/32
E.
1/8
Cobalt-60 is a beta emitter with a half-life of 5.3 years. Approximately what
fraction of cobalt-60
atoms will remain in a particular sample after 26.5 years?
A.
1/5
B.
1/16
C.
1/26
D.
1/32
E.
1/64
Which isotope, when bombarded with nitrogen-15, yields the artificial isotope
dubnium-260 plus 4
neutrons?
A.
californium-245
B.
thorium-257
C.
nobelium-245
D.
californium-249
E.
dubnium-249
10.
In the following reaction, identify X.
A.
B.
C.
D.
E.
11.
12.
13.
Decay of tin-110 by electron capture yields
A.
tin-109.
B.
cadmium-106.
C.
indium-110.
D.
antimony-110.
E.
tellurium-114.
Decay of ruthenium-93 by positron emission yields
A.
technetium-93.
B.
molybdenum-89.
C.
palladium-97.
D.
rhenium-93.
E.
ruthenium-92.
When atoms of aluminum-27 are bombarded with alpha particles, a neutron and
an element are
produced. The particular isotope formed is
A.
B.
C.
D.
E.
14.
15.
The general formula for alkenes is
A.
CnH2n+2
B.
C2nH2n
C.
CnHn+2
D.
CnH2n
E.
CnH2n-2
Which one of these formulas is that of an unsaturated hydrocarbon?
A.
B.
C.
D.
E.
16.
Which one of these hydrocarbons does not have isomers?
A.
C7H16
B.
C6H14
C.
C5H10
D.
C4H8
E.
C3H8
17.
18.
19.
20.
Which of these species are structural isomers of C6H14?
A.
I and II
B.
I and III
C.
II and III
D.
II and IV
E.
III and IV
Which of these species is an aromatic compound?
A.
C2H2
B.
C6H12
C.
C6H4Br2
D.
C5H10
E.
C2H4Br2
The name for the compound with the formula CH3CH2CH2CH2OH is
A.
propanol.
B.
propane.
C.
butanol.
D.
pentane.
E.
pentanol.
Which type of organic compound does not contain a carbonyl group?
A.
ethers
21.
B.
carboxylic acids
C.
ketones
D.
aldehydes
E.
esters
Which one of these compounds will result from the addition of HCl to
A.
B.
C.
D.
E.
22.
23.
none of these
Which of these is the systematic name for the compound represented below?
A.
2-ethylbutane
B.
3-methylpentene
C.
3-methyl-1-pentene
D.
3-methyl-1-hexene
E.
2-methylhexane
The correct structure for 2,3,3-trimethylpentane is
A.
?
B.
C.
D.
24.
40
25.
The gamma rays from cobalt-60 are used in cancer radiation treatment. What is
the nuclide produced in this
decay process?
Ar can be prepared by electron capture from
36
a)
Cl.
40
b)
K.
41
c)
Ar.
40
d)
Ca.
33
e)
S
a)
60
27
Co
b)
59
27
Co
c)
60
28
Ni
d)
59
26
Fe
e)
58
26
Fe
Part II – Show Your Work.
1.
Name the following compound:
CH3
|
CH3CHCH2CH2CHCH2CHCH2CH3
|
|
CH3
CH2CH3
b. trans-5-methyl-2-hexene
c. Draw the following molecule:
1-ethyl-1-methylcyclopentane
2.
Draw and name the structural isomers which have the molecular formula C4H9Br.
3.
Carbon-11 has a half-life of 20.4 minutes. Assuming you start with a 500 g
sample of
carbon-11,how much will remain after 24 hours? (Show calculation)
4.
i. Write the nuclear equation for the beta decay of iodine-131.
ii. By what process does oxygen-15 decay to nitrogen-15?
iii. The alpha decay of what isotope of what element produces lead-206?
iv. In the nuclear transmutation, 168O (p, ) X, what is the product nucleus
X?
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