Radioactive Decay And Acid Dissociation Constant Chap. 9 And 10 Worksheet With Answers - Middle Tennessee State University Page 18
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2010.37 Explain why carbon-14 with a half-life of about 5600 years would not be a good
radioisotope to use if you want to determine the age of a coal bed thought to be
several million years old.
Solution
After 10 half-lives, the amount of the radioisotope left is less than 1/1000 of
the original amount. This would almost be undetectable. Ten half-lives for
14
14C = 56,000 years. The amount of
C left after several million years would
be essentially zero.
Induced Nuclear Reactions (Section 10.8)
10.43 To make indium-111 for diagnostic work, silver-109 is bombarded with
particles. What isotope forms when a silver-109 captures an particle? Write
a balanced equation to represent the process. What two particles must be
emitted by the isotope to form indium-111?
Solution
1 09
4
111
1
Ag +
In + 2
n
47
49
0
2
Two neutrons are emitted as a result of the bombardment.
Nuclear Energy (Section 10.9)
10.45 Write one balanced equation that illustrates nuclear fission.
Solution
235
1
139
95
1
U +
n
Xe +
Sr + 2
n
92
0
54
38
0
10.47 Explain why critical mass is an important concept in neutron-induced fission
chain reactions.
Solution
A critical mass is when there is enough fissionable material present to
support a self-sustained fission reaction. This process is used for
commercial power generation.
10.49 Complete the following equations, which represent two additional ways uranium-
235 can undergo nuclear fission.
Solution
ADDITIONAL EXERCISES
10.51 Polonium-210 decays by alpha emission and has a half-life of 138 days.
20
Suppose a sample of Po-210 contains 6.02x10
Po-210 atoms and undergoes
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