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 U3 to Th3 to Pa3 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 U3 to U3? 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 halflife of sodium5 if.00 gram of a 6.00gram sample of sodium5 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 halflife 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 halflife of less than minute? Fr0 N6 K P3 9. Based on Reference Table N, what fraction of a sample of gold9 remains radioactive after.69 days? After 3 days, 5 milligrams of an 0milligram sample of a radioactive isotope remains unchanged. What is the halflife of this element? days 6 days days days. According to Reference Table N, which radioactive isotope will retain only oneeighth ( ) its original radioactive atoms after approximately 3 days? gold9 phosphorus3 iodine3 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 halflife 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 nonshaded region represents stable decay products.) 6. What is the approximate halflife 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 halflife decreases remains the same increases 9. The halflife 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 halflife 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 halflife periods? 50 g 00 g 00 g 00 g 33. What is the total number of grams of a 3gram 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 60.0gram sample of 6 N will remain unchanged after. seconds? 3.75 g 5.0 g 7.50 g 30.0 g
5 36. The halflife 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 halflife periods required for a sample of a radioactive material to decay to onesixteenth 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 halflife and the same decay mode shorter halflife and a different decay mode longer halflife and the same decay mode longer halflife 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 halflife 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 halflife 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 halflife in minutes? An 0 milligram sample of a radioactive isotope decays to 5 milligrams in 3 days. What is the halflife of this element? days 6 days days days 7. If a radioactive substance has a halflife 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 halflife 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 Au9 0 g of P3 0 g of I3 0 g of Rn 50. As the temperature of a sample of a radioactive element decreases, the halflife 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 halflife of this element? 5 days 5 days 0 days 0 days 5. Approximately how many grams of a 0gram sample of 3 53 I will remain unchanged after days? The halflife 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 halflife? C 3 H 37 K 3 P
7 57. A radioactive element has a halflife of days. Which fraction represents the amount of an original sample of this element remaining after 6 days? 3 5. Which of the following 0gram samples of radioisotope will decay to the greatest extent in days? 3 5 P 5 36 Kr 0 7 Fr 3 53 I 59. An original sample of a radioisotope had a mass of 0 grams. After days, 5 grams of the radioisotope remains unchanged. What is the halflife of this radioisotope? day 5 days days days 60. The decay of which radioisotope can be used to estimate the age of the fossilized remains of an insect? Rn Co60 I3 C 6. Which isotope is most commonly used in the radioactive dating of the remains of organic materials? C 6 N 3 P 37 K 6. Which isotopic ratio needs to be determined when the age of ancient wooden objects is investigated? uranium35 to uranium3 hydrogen to hydrogen3 nitrogen6 to nitrogen carbon to carbon 63. Which procedure is based on the halflife of a radioisotope? accelerating to increase kinetic energy radiating to kill cancer cells counting to determine a level of radioactivity dating to determine age 6. A radioactivedating procedure to determine the age of a mineral compares the mineral's remaining amounts of isotope 3 U and isotope 06 Pb 06 Bi Pb Bi 65. The course of a chemical reaction can be traced by using a polar molecule stable isotope diatomic molecule radioisotope 66. The radioisotope I3 is used to control nuclear reactors determine the age of fossils diagnose thyroid disorders trigger fussion reactors 67. Radioisotopes used for medical diagnosis must have long halflives and be quickly eliminated by the body long halflives and be slowly eliminated by the body short halflives and be quickly eliminated by the body short halflives and be slowly eliminated by the body
8 6. A radioisotope which is sometimes used by doctors to pinpoint a brain tumor is carbon technetium99 lead06 uranium3
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