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Solve problems involving half life including

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Solve problems involving half-life, including determining the amount of material remaining or starting, and the amount of time passed: Describe radiochemical dating (carbon-14 article) Compare and contrast nuclear fission and fusion o Explain why energy is released when either fission or fusion occurs (E = mc 2 ) o Explain why the products of fusion and fission are more stable than what they start with o Describe thermonuclear reactions and know where they occur Explain what a nuclear chain reaction is, what critical mass is, and how they are related. Explain how nuclear energy is used to produce electricity. o Describe some dangers and problems associated with nuclear energy (i.e. Alchemist/Chernobyl) o Explain why fusion is not used in nuclear power plants and what it would take to achieve it. Describe several methods of detecting and measuring radiation (film, Geiger counter, scintillation counter) Explain how radiation is used in medicine Describe the biological harm from exposure to radiation and explain that most radiation exposure is from natural sources. Useful equations: A = A 0 1 2 ( ) n , where A = final amount, A 0 = initial amount, and n = Elapsed time Half-life (or t 1/2 ) 1. Problems pg. 836-837 #38, 40, 42-46, 48, 51, 56, 57, 59, 62, 64-67, 69-72, 74 (determine what the other product is), 75 (determine what else is produced), 77, 79 Additional Problems: 1. Complete the following radioactive decay series:
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Chapter 25 Review 2 2. Technetium-99, which has a half-life of 6.0 hrs, is used as a radiotracer in medical applications. If a patient has 100 mg of Tc-99 injected into her, how much time will pass until 6.25 mg remain in her system? 3. The half-life of radon-222 is 3.82 days. What was the original mass if 0.50 g Rn-222 remains after 11.46 days? Remember to review all our worksheets and the quiz! Answers to calculation problems: 77. 3.00 mg, 0.188 mg; 79. 0.629 mg; Additional Problems 2. 24 hrs; 3. 4.0 g
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