EXERCISE 15-1 Nuclear Chemistry

Click on the correct answer



1 Gold has only one naturally isotope on earth. How many neutrons are in a naturally occurring gold nucleus?
197
118
79
None of the previous answers.

2 Arsenic has only one naturally isotope on earth. How many neutrons are in a naturally occurring arsenic nucleus?
75
33
42
None of the previous answers.

3 Which one of the following isotopes of cobalt is probably stable?
54Co
63Co
59Fe
59Co
None of the previous answers.

4 Which one of the following isotopes is probably unstable?
16O
13O
89Y
209Bi
None of the previous answers.

5 Unstable nuclei undergo radioactive decay by several pathways including emission of alpha particles (4He) and beta particles (e-). 14C decays by emitting a beta particle. What is the other product?
10Be
14N
14B
13C
None of the previous answers.

6 238U decays by emitting an alpha particle. What is the other product?
234Th
238Np
234U
234Pa
None of the previous answers.

7 98Tc decays by emitting a beta particle. What is the other product?
97Mo
97Tc
98Ru
99Tc
None of the previous answers.

8 210Po decays by emitting a alpha particle. What is the other product?
206Pb
206Po
206Bi
210At
None of the previous answers.

9 An unknown isotope decays by emitting a alpha particle and forms 235U. What was the original isotope?
239U
231Th
235Np
239Pu
None of the previous answers.

10 65Ni radioactively decays to 65Cu with a half life of 2.5 hours. What was the other decay product?
alpha particle
beta particle
neutron
proton
none of the previous answers.

11 How long would it take for 64 grams of 65Ni to decay to 8 grams?
2.5 hrs
5 hrs
7.5 hrs
10 hrs.
None of the previous answers.

12 Which one of the following is an example of nuclear fission?
226Ra ® 222Rn + 4He
90Sr ® 90Y + e-
1n + 235U ® 139Ba + 94Kr + 3 1n
2H + 3H ® 4He + 1n
None of the previous answers.

13 Which one of the following is an example of nuclear fusion?
226Ra ® 222Rn + 4He
90Sr ® 90Y + e-
1n + 235U ® 139Ba + 94Kr + 3 1n
2H + 3H ® 4He + 1n
None of the previous answers.


return to the table of contents