Download Chemistry Semester II Exam Review Chp 25 Nuclear

Chemistry Semester II Exam Review
Chp 25 Nuclear Chemistry
1. What particle is needed to complete the following nuclear equation?
Mn ____ + e
2. When radium-226 (atomic number 88) decays by emitting an alpha particle, it becomes
____.
3. The charge on a gamma ray is ____.
4. What particle is needed to complete the following equation?
N + ____
C+ H
5. Which type of coolant(s) usually is (are) used to remove heat from a nuclear reactor core?
6. Control rods made of ____.
7. What particle does argon-39 (atomic number 18) emit when it decays to potassium-39
(atomic number 19)?
8. The least penetrating form of radiation is ____.
9. What particle is emitted in alpha radiation?
10. Controlled nuclear chain reactions ____.
11. To what element does polonium-208 (atomic number 84) decay when it emits an alpha
particle?
12. A beta particle is a(n) ____.
13. Which symbol is used for an alpha particle?
14. What is the approximate half-life of uranium-238?
15. What is the change in the atomic number when an atom emits an alpha particle?
16. What is the change in atomic number when an atom emits a beta particle?
17. What particle is needed to complete this nuclear reaction?
Rn
Po + _____
18. Which of the following materials is most effective for stopping gamma radiation?
19. The concentration of carbon-14 in a piece of wood from an ancient burial mound indicates
that two half-lives of this radioisotope have passed. If the half-life (t ) for carbon-14 is
5730 years, approximately how many years ago did this sample of wood die?
20. If the half-life of sodium-24 is 15 hours, how much remains from a 10.0-g sample after 60
hours?
21. If the half-life of a radioactive material is 8 years, how many years will it take for one half
of the original amount of material to decay?
22. Complete the following nuclear reaction:
U
He + Th
23. The radioisotope radon-222 has a half-life of 3.8 days. How much of a 73.9-g sample of
radon-222 would be left after approximately 23 days?