Chem 051 - Chemistry for Allied Health Professionals » Winter 2024 » Quiz 4 Radioactive decay

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Question #1
A nuclear equation is balanced when
A.   the sum of the mass numbers and the sum of the atomic numbers of the particles and atoms are the same on both sides of the equation.
B.   the charges of the particles and atoms are the same on both sides of the equation.
C.   the same particles and atoms are on both sides of the equation.
D.   the same elements are found on both sides of the equation.
Question #2
A wooden object from a prehistoric site has a carbon-14 activity of 10 counts per minute (cpm) compared to 40 cpm for new wood. If carbon-14 has a half-life of 5730 years, what is the age of the wood?
A.   5730 yr
B.   1430 yr
C.   17,200 yr
D.   11,500 yr
Question #3
Beta particles are identical to
A.   helium nuclei.
B.   electrons.
C.   protons.
D.   helium atoms.
Question #4
In the nuclear equation of a beta emitter,
A.   the new nucleus contains 2 fewer protons.
B.   the mass number of the new nucleus is 4 less than that of the original nucleus.
C.   the new nucleus contains 2 more protons.
D.   the new nucleus contains 1 more proton.
Question #5
Krypton-79 has a half-life of 35 hours. How many half-lives have passed after 105 hours?
A.   4 half-lives
B.   3 half-lives
C.   2 half-lives
D.   1 half-life
Question #6
Sodium-24 has a half-life of 15 hours. How many hours is three half-lives
A.   45 hours
B.   30 hours
C.   15 hours
D.   60 hours
Question #7
Sulfur-35 decays by beta emission. The decay product is 
A.   Cl-34
B.   P-35
C.   Cl-35
D.   S-34
Question #8
The damaging effects of radiation on the body are a result of
A.   the formation of unstable ions or radicals.
B.   extensive damage to nerve cells.
C.   the formation of radioactive atoms in the body.
D.   transmutation reactions in the body.
Question #9
Which is NOT a way to minimize your exposure to radiation?
A.   staying a longer time
B.   keeping a good distance
C.   wearing a lead apron
D.   standing behind a thick concrete wall

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