EXERCISE 15-1 Nuclear Chemistry
Click on the correct answer
1
Gold has only one naturally isotope on earth. How many neutrons are in a naturally occurring gold nucleus?
197
118
79
None of the previous answers.
2
Arsenic has only one naturally isotope on earth. How many neutrons are in a naturally occurring arsenic nucleus?
75
33
42
None of the previous answers.
3
Which one of the following isotopes of cobalt is probably stable?
54
Co
63
Co
59
Fe
59
Co
None of the previous answers.
4
Which one of the following isotopes is probably unstable?
16
O
13
O
89
Y
209
Bi
None of the previous answers.
5
Unstable nuclei undergo radioactive decay by several pathways including emission of alpha particles (
4
He) and beta particles (e
-
).
14
C decays by emitting a beta particle. What is the other product?
10
Be
14
N
14
B
13
C
None of the previous answers.
6
238
U decays by emitting an alpha particle. What is the other product?
234
Th
238
Np
234
U
234
Pa
None of the previous answers.
7
98
Tc decays by emitting a beta particle. What is the other product?
97
Mo
97
Tc
98
Ru
99
Tc
None of the previous answers.
8
210
Po decays by emitting a alpha particle. What is the other product?
206
Pb
206
Po
206
Bi
210
At
None of the previous answers.
9
An unknown isotope decays by emitting a alpha particle and forms
235
U. What was the original isotope?
239
U
231
Th
235
Np
239
Pu
None of the previous answers.
10
65
Ni radioactively decays to
65
Cu with a half life of 2.5 hours. What was the other decay product?
alpha particle
beta particle
neutron
proton
none of the previous answers.
11
How long would it take for 64 grams of
65
Ni to decay to 8 grams?
2.5 hrs
5 hrs
7.5 hrs
10 hrs.
None of the previous answers.
12
Which one of the following is an example of nuclear fission?
226
Ra
®
222
Rn +
4
He
90
Sr
®
90
Y + e
-
1
n +
235
U
®
139
Ba +
94
Kr + 3
1
n
2
H +
3
H
®
4
He +
1
n
None of the previous answers.
13
Which one of the following is an example of nuclear fusion?
226
Ra
®
222
Rn +
4
He
90
Sr
®
90
Y + e
-
1
n +
235
U
®
139
Ba +
94
Kr + 3
1
n
2
H +
3
H
®
4
He +
1
n
None of the previous answers.
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