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Radioactivity Chapter Exam

Exam Instructions:

Choose your answers to the questions and click 'Next' to see the next set of questions. You can skip questions if you would like and come back to them later with the yellow "Go To First Skipped Question" button. When you have completed the practice exam, a green submit button will appear. Click it to see your results. Good luck!

Page 1

Question 1 1. Cobalt-57 has a half-life of about 272 days. If a sample has an initial mass of 2.24 grams and undergoes decay until it has a mass of 0.140 grams, then how many half-lives passed?

Question 2 2. The formation of uranium-236 from plutonium-240 occurs by:

Question 3 3. Which of the following is really just a high-energy electron?

Question 4 4. A sample of thulium-171 has a mass of 0.4055 grams. How much is left after 6 half-lives?

Question 5 5. Which of the following has a mass of 1 and an atomic number of 1?

Page 2

Question 6 6. During a nuclear reaction, mass is lost. Which of the following does this result in?

Question 7 7. Which of the following statements is NOT true regarding the process of nuclear fusion?

Question 8 8. A 6.95 gram sample of radioactive nobelium-259 has a half-life of 58 min. How much is left after 2 hours and 54 minutes?

Question 9 9. The difference between the mass of the nucleus and the sum of each individual nucleon is:

Question 10 10. Carbon-10 has a half-life of about 19 seconds. How many half-lives does it undergo in 2 minutes and 32 seconds?

Page 3

Question 11 11. When neptunium-238 decays, it emits two alpha particles, a beta particle, and a gamma particle. The resulting isotope is:

Question 12 12. What is the product of a cobalt-60 atom that undergoes two beta decays?

Question 13 13. When does nuclear fusion occur?

Question 14 14. Two artifacts have recently been discovered. After testing, it is found that Artifact A has 20% of carbon-14 in it, while Artifact B has 35% of carbon-14 in it. Which of the two artifacts is the OLDEST?

Question 15 15. Rochelle has been experiencing fatigue, depression, and has had difficulty concentrating. Her physician believes she has an underperforming thyroid and wants to run some tests. Iodine-131 will be used to study the activity of Rochelle's thyroid. This substance is an example of _____.

Page 4

Question 16 16. When polonium-218 decays, it emits a beta particle, followed by an alpha particle. The resulting isotope is:

Question 17 17. What is the energy required to break a nucleus into its individual nucleons called?

Question 18 18. Which particles are present in the nucleus of an atom?

Question 19 19. If a substance has a half-life of 5 years, then how much of the initial sample remains after 15 years?

Question 20 20. Which of the following has no mass and does not change the composition of the nucleus?

Page 5

Question 21 21. The equation E = mc2 shows that mass and energy are:

Question 22 22. How does a nuclear reaction differ from a chemical reaction?

Question 23 23. The type of nuclear power that occurs when a heavier atom splits into smaller pieces, which is the most common on Earth is known as _____.

Question 24 24. An element undergoes gamma decay to form lead-206. What was the identity of that initial element?

Question 25 25. The charges on beta particles (Β - ), alpha particles (α) and gamma (γ) rays are _____ respectively.

Page 6

Question 26 26. Becky was recently diagnosed with an aggressive brain tumor. Her oncologist recommended treating the tumor with cobalt-60 due to its precision with treating this type of cancer. This substance is being used for _____.

Question 27 27. Which type of reaction is involved with nuclear reactors?

Question 28 28. The equation E = mc2 shows that a small amount of mass creates _____.

Question 29 29. Despite human skin providing protection against alpha particles, why is it dangerous to ingest alpha particles?

Question 30 30. Which of the following can be shielded by a piece of paper?

Radioactivity Chapter Exam Instructions

Choose your answers to the questions and click 'Next' to see the next set of questions. You can skip questions if you would like and come back to them later with the yellow "Go To First Skipped Question" button. When you have completed the practice exam, a green submit button will appear. Click it to see your results. Good luck!

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