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Chapter 21 Nuclear Chemistry

Multiple Choice
Identify the choice that best completes the statement or answers the question.
 

 1. 
In balancing the nuclear reaction mc001-1.jpgU ® mc001-2.jpgE  +  mc001-3.jpgHe, the identity of element E is __________.
a.
Pu
b.
Np
c.
U
d.
Pa
e.
Th
 

 2. 
This reaction is an example of __________.

mc002-1.jpgPo ® mc002-2.jpgPb  +  _____
a.
alpha decay
b.
beta emission
c.
gamma emission
d.
positron emission
e.
electron capture
 

 3. 
The missing product from this reaction is __________.

mc003-1.jpgI ® mc003-2.jpgTe  +  _____
a.
mc003-3.jpgHe
b.
mc003-4.jpge
c.
mc003-5.jpgn
d.
mc003-6.jpge
e.
mc003-7.jpgg
 

 4. 
What is the mass number of a neutron?
a.
2
b.
1
c.
3
d.
4
e.
0
 

 5. 
What order process is radioactive decay?
a.
zeroth
b.
first
c.
second
d.
third
e.
fourth
 

 6. 
131I has a half-life of 8.04 days. Assuming you start with a 1.53 mg sample of  131I, how many mg will remain after 13.0 days?
a.
0.835
b.
0.268
c.
0.422
d.
0.440
e.
0.499
 

 7. 
The decay of a radionuclide with a half-life of 4.3 ´ 105 years has a rate constant (in yr-1) equal to __________.
a.
6.2 ´ 105
b.
1.6 ´ 10-6
c.
2.3 ´ 10-6
d.
2.8 ´ 103
e.
5.9 ´ 10-8
 

 8. 
The mass of a proton is 1.00728 amu and that of a neutron is 1.00867 amu. What is the mass defect (in amu) of a mc008-1.jpgCo nucleus? (The mass of a cobalt-60 nucleus is 59.9338 amu.)
a.
27.7830
b.
0.5489
c.
0.5405
d.
0.0662
e.
0.4827
 

 9. 
Atoms with the same atomic number and different mass numbers
a.
do not exist.
b.
are isomers.
c.
are isotopes.
d.
are allotropes
e.
are resonance structures.
 



 
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