Chemistry (Chang), 10th Edition

Chapter 23: Nuclear Chemistry

Self Assessment B

1
A radioisotope decays, producing an alpha particle and Th-234. The original radioisotope must have been an atom of ____.
A)Pa
B)Bi
C)U
D)Ra
E)Rb
2
When Pb-210 decays by release of a beta particle, what isotope is formed?
A)209Bi
B)210Bi
C)209Pb
D)210Tl
E)209Tl
3
Which of the following isotopes is most likely to be stable?
A)72Rb
B)57Cr
C)38Ar
D)42Sc
E)23Mg
4
An alkaline earth element is radioactive. It and its daughter elements decay by emitting three alpha particles in succession. In what group of the preceding period on the periodic table will the product of this decay sequence be found?
A)Group I
B)Group III
C)Group IV
D)Group VI
E)Group VIII
5
What fraction of radioactive atoms remains in a sample after three half-lives?
A)1/2
B)1/4
C)1/8
D)1/16
E)1/32
6
Cesium-134 is a beta-emitter with a half-life of 2 yr. What will be the mass of cesium-134 remaining after 10 years if the initial sample mass was 2.50 g?
A)7.82 x 10-2 g
B)0.500 g
C)2.44 x 10-3 g
D)0.250 g
7
The half-life of 90Sr is 20 yr. If a sample of this nuclide has an initial activity of 8000 disintegrations per minute, what will be its activity after 80 yr?
A)2000 disintegrations per minute
B)250 disintegrations per minute
C)1000 disintegrations per minute
D)500 disintegrations per minute
8
A typical neutron-initiated fission of 235U yields 97Mo, two neutrons, and an isotope of what element?
A)In
B)Sn
C)Te
D)Sb
9
Which of the following materials is put into a nuclear reactor to slow the chain reaction?
A)control rods
B)reflectors
C)moderators
D)heavy water
10
What is the specific activity, in Ci/g, of an isotope if 4.56 mg of the isotope emits 2.27 x 108b particles per second? [1 Ci = 3.7 x 1010 disintegrations/second.]
A)4.97 Ci/g
B)0.135 Ci/g
C)1.33 x 10-3 Ci/g
D)1.35 Ci/g
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