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1. What does the 101 in
represent?
a. the mass number
b. the atomic number
2. What does the 218 in polonium-218 represent?
a. the mass number
b. the atomic number
3. Balance the following equation:
c. the nuclide number
d. the number of neutrons
c. the mass defect
d. the neutron number
____
a.
c.
b.
d.
4. Balance the following equation:
a.
b.
+ ____
c.
d.
5. Balance the following equation:
a.
b.
____ +
c.
d.
6. Alpha particles are
a. electrons.
c. electromagnetic waves.
b. helium nuclei.
d. neutrons.
7. Beta particles are
a. electrons.
c. electromagnetic waves.
b. helium nuclei.
d. neutrons.
8. Gamma rays are
a. electrons.
c. electromagnetic waves.
b. helium nuclei.
d. neutrons.
9. Which of the following is the symbol for an alpha particle?
a.
c.
b.
d.
_ 10. The half-life of an isotope is the time required for half the nuclei in a sample to
a. undergo radioactive decay.
c. undergo nuclear fusion.
b. undergo nuclear fission.
d. react chemically.
_ 11. How many half-lives are required for three-fourths of the nuclei of one isotope in a sample to decay?
a.
c. 2
b.
d. 3
_ 12. What is the half-life of an isotope if 125 g of a 500 g sample of the isotope remain after 3.0 years?
a. 1.5 years
c. 3.5 years
b. 2.5 years
d. 4.5 years
13. The nuclide
contains ____________________ protons.
14. The nuclide
contains ____________________ neutrons.
15. Write the nuclear equation for each of the following reactions. Refer to a periodic table.
a. the alpha decay of
b. the beta decay of
16. What is the half-life of an isotope if after 2.00 weeks you have 31.25 g remaining from a 250.0 g starting sample size?
clear
swer Section
ULTIPLE CHOICE
1. ANS: B
OBJ: 1
2. ANS: A
OBJ: 1
3. ANS: A
OBJ: 4
4. ANS: B
OBJ: 4
5. ANS: C
OBJ: 4
6. ANS: B
OBJ: 2
7. ANS: A
OBJ: 2
8. ANS: C
OBJ: 2
9. ANS: D
OBJ: 2
10. ANS: A
OBJ: 3
11. ANS: C
Solution:
PTS: 1
DIF: I
REF: 1
PTS: 1
DIF: I
REF: 1
PTS: 1
DIF: II
REF: 1
PTS: 1
DIF: II
REF: 1
PTS: 1
DIF: II
REF: 1
PTS: 1
DIF: I
REF: 2
PTS: 1
DIF: I
REF: 2
PTS: 1
DIF: I
REF: 2
PTS: 1
DIF: I
REF: 2
PTS: 1
DIF: I
REF: 2
PTS: 1
12. ANS: A
Solution:
DIF: I
REF: 2
OBJ: 3
DIF: III
REF: 2
OBJ: 3
DIF: I
REF: 1
OBJ: 1
PTS: 1
MPLETION
13. ANS: 53
PTS: 1
14. ANS: 118
PTS: 1
DIF: II
REF: 1
OBJ: 1
PTS: 1
DIF: II
16. ANS:
half-life = 4.67 days
Solution:
REF: 1
OBJ: 4
REF: 2
OBJ: 3
OBLEM
15. ANS:
a.
b.
PTS: 1
DIF: III