Name: ______Pretest: _____/34
Posttest: _____/34
Ch 9 Pretest: Nuclear Energy
Match the vocabulary term on the left with the correct definition on the right.
1. _____ product of radioactive decay that is madeA. Alpha particle
of a high-energy photon B. Background Radiation
2. _____ product of radioactive decay that is C. Beta particle
made of a charged electron D. Fission
3. _____ product of radioactive decay that is E. Fusion
made of two protons and two neutronsF. Gamma Ray
4. _____ process by which a nucleus splits into G. Half-life
two or more fragments and releases H. Nuclear Chain Reaction
neutrons and energy I. Radioactivity
5. _____ a continuous series of nuclear fission J. Radioactive tracer
reactionsK. Strong nuclear force
6. _____ counteracts repulsion between protons
and holds nucleus together
7. _____ found naturally in low levels from cosmic rays and from radioactive isotopes
in the soil and air
8. _____ process in which light nuclei combine at extremely high temperatures
forming heavier nuclei and releasing energy
9. _____ matter and energy that is released from the nucleus during radioactive decay
10. _____ a radioactive material that is added to a substance so that its distribution
can be detected later.
11. _____ the time required for half of a sample of a radioactive substance to become
stable
Review stuff from ch 4 (4.2 specifically)
12. ______An atom with a different number of neutrons is called a(n)…
13. ______The number of protons and neutrons an atom has.
14. ______this is called….
15. – 16. It has ______protons and ______neutrons.
Half Life Graph and Calculations (Show work for full credit)
17. ______A 208 g sample of sodium-24 decays to 13.0 g of
sodium-24 in 60.0 hours. What is the half-life of this radioactive isotope?
18. ______Chromium-48 has a short half-life of 21.6 hours. How
long will it take 360.00 g of chromium-48 to decay to 11.25 grams?
19. ______Carbon-14 has a half-life of 5730 years. How much of a
144 gram sample of carbon-14 will remain after 17,190 years?
To the right is a graph showing the radioactive decay of a substance. Use it to answer the following questions.
20. What is the half-life of this
substance?
21. How can you tell?
22. How many half-lives will it take for 5 kg of
the substance to remain?
23. After 6 days, how much of the substance will remain, if I started with 120 g?
24. – 26. Describe what happens during nuclear fission and nuclear fusion. How are
they similar and different?
27. – 28. List one advantage and one disadvantage of nuclear energy as a power
source.
29. What happens to the amounts of mass and energy in fission and fusion? (Howare they converted?)
30. – 32. Different types of radiation can pass through different thickness anddensities of material. Label the three arrows below with the types of radiation that they represent.
33. – 34. List two common, everyday activities that add to your amount of natural
nuclear radiation exposure.