# 5. In the equation: 1. Which equation represents the radioactive decay of 226. Ra -

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1 . Which equation represents the radioactive decay of 6 Ra? 6 Ra - 6 Rn + He 6 6 Ra - 9 Ac + 0 e 6 6 Ra - 7 Fr e 6 5 Ra - Ra + 0 n. The chart below shows the spontaneous nuclear decay of U-3 to Th-3 to Pa-3 to U In the equation: 3 9 Pa 3 9 U + X The X represents a helium nucleus proton beta particle neutron 6. According to the equation: X 0 Pb + He The nucleus correctly represented by X is 0 0 Hg Po 0 0 Bi Pb 7. In the equation: 3 90 Th 3 9 Pa + X What is the correct order of nuclear decay modes for the change from U-3 to U-3? î decay, decay, î decay î decay, î decay, í decay í decay, í decay, î decay í decay, î decay, î decay 3. Which product of nuclear decay has mass but no charge? alpha particles gamma rays neutrons beta positrons. In the equation: 39 0 Th 3 9 Pa + X The symbol X represents 0 + e 0 e 0 n H Which particle is represented by X? 0 e He H 0 + e. In the equation: 6 Ra 6 Rn + X X represents a neutron a beta particle a proton an alpha particle 9. Given the reaction: 3 9 Pa X + 0 e When the equation is correctly balanced the nucleus represented by X is 3 9 U 35 9 U Th 3 90 Th

2 0. Given the equation: 9 F O + X Which symbol, when substituted for X, correctly balances the equation? H 0 n 0 e 0 + e. In the equation: X 6 Ra + He The symbol X represents 6 Th Th 6 Rn Rn. A neutron has approximately the same mass as an alpha particle an electron a beta particle a proton 3. What is the half-life of sodium-5 if.00 gram of a 6.00-gram sample of sodium-5 remains unchanged after 37 seconds? 7. s 79.0 s 59.3 s s. Based on Reference Table N, what is the fraction of a sample of potassium- that will remain unchanged after 6.0 hours? 5. What is the half-life and decay mode of Rn-?.9 days and alpha decay.9 days and beta decay 3. days and alpha decay 3. days and beta decay 6. Based on Reference Table N, what fraction of a radioactive 90 Sr sample would remain unchanged after 56. years? 6 7. How many days are required for 00. grams of radon- to decay to 50.0 grams?.9 days 7.6 days 3. days.5 days. Which radioisotope undergoes beta decay and has a half-life of less than minute? Fr-0 N-6 K- P-3 9. Based on Reference Table N, what fraction of a sample of gold-9 remains radioactive after.69 days? After 3 days, 5 milligrams of an 0-milligram sample of a radioactive isotope remains unchanged. What is the half-life of this element? days 6 days days days. According to Reference Table N, which radioactive isotope will retain only one-eighth ( ) its original radioactive atoms after approximately 3 days? gold-9 phosphorus-3 iodine-3 radon-. According to Table N, which radioactive isotope is best for determining the actual age of Earth? 3 U 90 Sr 60 Co C

3 Base your answers to questions 3 through 6 on on the graph below. The graph represents the decay of radioactive material X into a stable decay product.. Each of the objects below has different amounts remaining of the original radioactive material X. Which object is most likely the oldest? 3. If radioactive material X were heated, the length of its half-life period would decrease remain the same increase

4 5. Which graph best represents the relative percentages of radioactive material X and its stable decay product after 5,000 years?(the shaded region represents radioactive material while the non-shaded region represents stable decay products.) 6. What is the approximate half-life of radioactive material X? 5,000 yr 50,000 yr 0,000 yr 00,000 yr 7. Exactly how much time must elapse before 6 grams of potassium- decays, leaving grams of the original isotope?. hours 3. hours. hours. hours. As a sample of the radioactive isotope 3 I decays, its half-life decreases remains the same increases 9. The half-life of a radioactive substance is.5 minutes. What fraction of the original radioactive substance remains after 0 minutes? Approximately what fraction of an original Co 60 sample remains after years? 6 3. The half-life of 3 I is.07 days. What fraction of a sample of 3 I remains after. days? 6 3. What was the original mass of a radioactive sample that decayed to 5 grams in four half-life periods? 50 g 00 g 00 g 00 g 33. What is the total number of grams of a 3-gram sample of 3 P remaining after 7.5 days of decay?.0 g.0 g.0 g.0 g 3. In how many days will a -gram sample of 3 53 I decay, leaving a total of.5 grams of the original isotope? What mass of a 60.0-gram sample of 6 N will remain unchanged after. seconds? 3.75 g 5.0 g 7.50 g 30.0 g

5 36. The half-life of 6 C is 5,730 years. What fraction of a gram sample of 6 C would remain after 7,90 years? What is the number of half-life periods required for a sample of a radioactive material to decay to one-sixteenth its original mass? A sample of 3 I decays to.0 gram in 0. days. What was the mass of the original sample?.0 g 3 g 6 g.0 g 39. Compared to 37 K, the isotope K has a shorter half-life and the same decay mode shorter half-life and a different decay mode longer half-life and the same decay mode longer half-life and a different decay mode 0. What total mass of a 6 gram sample of 60 Co will remain unchanged after 5.9 years?.0 g.0 g.0 g.0 g. A 0.0 milligram sample of 33 P decays to 0.0 milligrams in 50.0 days. What is the half-life of 33 P?.5 days 37.5 days 5.0 days 75.0 days. If.0 grams of a sample of 60 Co existed in 990, in which year will the remaining amount of 60 Co in the sample be 0.50 gram? If 3.0 grams of 90 Sr in a rock sample remained in 99, approximately how many grams of 90 Sr were present in the original rock sample in 933? 9.0 g 3.0 g 6.0 g. g. As a sample of a radioactive element decays, its half-life decreases remains the same increases 5. If 0 milligrams of a radioactive element decays to 0 milligrams in 30 minutes, what is the element's half-life in minutes? An 0 milligram sample of a radioactive isotope decays to 5 milligrams in 3 days. What is the half-life of this element? days 6 days days days 7. If a radioactive substance has a half-life of 9 days what fraction of its original mass would remain after 7 days? 3

6 . The graph below represents the decay of a radioactive isotope. 5. The graph below represents the decay curve of a radioactive isotope. The half-life of this isotope is years 5 years 30 years 60 years Based on Reference Table H, which radioisotope is best represented by the graph? 3 P 3 I 9 Au Rn 9. Which sample will decay least over a period of 30 days? 0 g of Au-9 0 g of P-3 0 g of I-3 0 g of Rn- 50. As the temperature of a sample of a radioactive element decreases, the half-life of the element decreases remains the same increases 5. Which radioactive sample would contain the greatest remaining mass of the radioactive isotope after 0 years?.0 grams of 9 Au.0 grams of K.0 grams of 3 P.0 grams of 60 Co 53. After 30 days, 5.0 grams of a radioactive isotope remains from an original 0.-gram sample. What is the half-life of this element? 5 days 5 days 0 days 0 days 5. Approximately how many grams of a 0-gram sample of 3 53 I will remain unchanged after days? The half-life of a radioactive isotope is 0.0 minutes. What is the total amount of a.00- gram sample of this isotope remaining after.00 hour? g 0.50 g g 0.5 g 56. Which of the following radioisotopes has the shortest half-life? C 3 H 37 K 3 P

8 6. A radioisotope which is sometimes used by doctors to pinpoint a brain tumor is carbon- technetium-99 lead-06 uranium-3

9 Reference Tables

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