Chapter 21 Makeup
Student:
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1. On a plot of the number of neutrons versus the number of protons, a nucleus of aluminum-28
lies above the belt of stability. Write an equation for radioactive decay of aluminum-28.
2. Complete and balance the nuclear equation
3. Complete and balance the nuclear equation
4. Complete and balance the nuclear equation
5. Complete and balance the nuclear equation
6. Complete and balance the nuclear equation
7. Balance the equation
8. Balance the equation
9. Balance the equation
10. Balance the equation
11. Balance the equation
12. Predict which nucleus is less stable,
or
.
13. Predict which nucleus is less stable,
or
.
14. Predict which nucleus is less stable,
or
.
15. Describe the role of a moderator in a fission reactor, and give examples of two substances
that are used as moderators.
16. Calculate the binding energy per nucleon of an Al-27 nucleus given the following
masses:
: 26.981541 amu;
: 1.007838 amu;
: 1.008665 amu.
17. Find the nuclear binding energy of potassium-40 (atomic mass = 39.9632591 amu) in units of
joules per nucleon. [Data: neutron mass = 1.674928  10-24 g; proton mass = 1.672623  10-24 g;
electron mass = 9.109387  10-28 g; NA = 6.0221367  1023 /mol; c = 2.99792458  108 m/s]
A. 1.37  10-12 J/nucleon
B. 5.48  10-11 J/nucleon
C. 5.64  10-11 J/nucleon
D. 1.41  10-12 J/nucleon
E. 2.97  10-12 J/nucleon
18. What is the nuclear binding energy per nucleon, in joules, for
amu). [Data:
(atomic mass) = 1.007825 amu;
amu; c = 3.00  108 m/s]
A. 0.22076 J/nucleon
B. 3.30  10-11 J/nucleon
C. 1.32  10-12 J/nucleon
D. 0.999 J/nucleon
E. None of these.
(atomic mass 24.985839
(mass) = 1.008665 amu; 1 kg = 6.022  1026
19. Calculate the energy released in joules when one mole of polonium-214 decays according to
the equation
[Atomic masses: Pb-210 = 209.98284 amu, Po-214 = 213.99519 amu, He-4 = 4.00260 amu.]
A. 8.78  1014 J/mol
B. 7.2  1014 J/mol
C. 8.78  1011 J/mol
D. -9.75  10-3 J/mol
E. 1.46  10-9 J/mol
20. Determine how much energy is released when thorium-230 decays according
to
[Atomic masses: thorium-230 = 230.033127 amu; helium-4 =
4.002603 amu; radium-226 = 226.025403 amu]
A. 3.98 109 kJ/mol
B. 4.60 108 kJ/mol
C. 7.20 1011 kJ/mol
D. 4.90 109 kJ/mol
E. 7.15 1011 kJ/mol