Arsenic-74 is a radioisotope used for locating brain tumors.  If t1/2 of arsenic-74 is 18 days, how much of a 120 mg sample remains after 90. days?       3.8 mg     60. mg     12 mg     18 mg     5.0 mg

Q: A Radioactive substance decays exponentially. A scientist begins with 250 milligrams of a…

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Q: If you accidentally spill phosphorus-32 onto your shoe, how long would it take before 99.9% of the…

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Q: Fill in the missing symbol in this nuclear chemical equation. 0 22Na+je 11

A: This is a radioactivity problem, here sodium nucleus emits a positron(0e1).

Q: Isotopes X goes through a BETA decay and becomes isotape Y. isotape Y goes through an ALPHA decay…

A: The different types of radioactive decay are as follows; α-decay               ⇒             XZA  →…

Q: Radioactive radon-222, found in many homes, is a potential health hazard. The half-life of radon-222…

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Q: 11. What is true of all nuclear reactions? a. They are exothermic. b. They consist of larger nuclei…

A: Nuclear reactions involve one or more nuclides to be produced by collisions between two atomic…

Q: In a functional assay, you find that your purified hCG sample has an activity of 20,000 mIU/ml…

A: The sample have to be 100 times less the original activity . Now first we have to calculate the…

Q: QUESTION 18 Choose all of the statements about nuclear reactions that are false. The relative…

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Q: Chromium-51 is a radioisotope that is used to assess the lifetime of red blood cells The half-life…

A: “Since you have asked multiple questions, we will solve the first question for you. If you want any…

Q: 1. How many half-lives have passed for Pb-210 after 89.2 years? _____ half-lives (HL)  2. How much…

A: The given radioactive element is Pb-210, any radioactive element is unstable and hence undergoes…

Q: Isotope of uranium 234U decays to thorium by the alpha decay with the half-life of 7.73 x 1012 s.…

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Q: Which combination of nucleons produces the largest number of stable isotopes? O odd number of…

A: Which combination of nucleons produces the largest number of stable isotopes?

Q: Halfnum-172 (172Hf) has a half- life of 1.87 years. How much is left of a 100 mg sample after 5…

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Q: Cobalt―60 is a radioactive isotope with a half-life of 5.26 years and emits beta particles. i.…

A: Half- life = 5.26 years. Cobalt-60 decays to Nickel-60 plus an electron and an electron…

Q: what is the na-me, 1/2, 01 12 = day:

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Q: Janus only agreed to make a substance with a lower potency of 10.0 % w/v. To attain this…

A: Given  Final Concentration in terms of % ( w/v )   =  10 %  Initial Concentration in terms of %(w/v)…

Q: O 8. Use a scientific or graphing calculator to solve. Thorium-228 is a radioactive substance that…

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Q: The half-life of 223Ra is 11.4 days. How much of a 200.0 mg sample remains after 600 hours?

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Q: 10. A student currently has 30 mg of caffeine in her body. If the caffeine came from a coffee drink…

A: Given:Currendy amount of caffeine in body, [A] = 30 mgcurrent time, t= 12 hrs half life…

Q: when it died. How much remains after 5 half lives

A: As we know, Radioactivity follows first order kinetics. So, after nth half life time , amount(A)…

Q: How many half lives have passed if we measure 1 µg/g parent isotopes and 15 µg/g daughter isotopes…

A: Given: The amount of parent isotope in the rock sample = 1 μg/g The amount of daughter isotope in…

Q: Iridium-192 is one radioisotope used in brachytherapy, in which a radioactive source is placed…

A: Given: The initial mass of iridium-192 = 4.75 g

Q: Phosphorus‐32 is used to study a plant’s use of fertilizer. It has a half‐life of 14.3 days. Write…

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Q: How many days would it take for one-fourth of the sample to decay? 37.5 days time: Incorrect

A: To calc the time , we first need to check the percent of iridium remaining after one-fourth decay.…

Q: Assuming that the global amount of radiocarbon is constant, decaying Carbon-14 is repeatedly…

A: The carbon-14 nucleus is a radioactive nucleus and its converts into nitrogen-14 and beta particle.…

Q: Sodium -24 has a half life of 15 hours how much sodium -24 will remain in an 18.0g sample after 60…

A: Nuclear chemistry.

Q: Radioisotope X has a half-life of 4.0 h. Based on the figure below, if the original sample of the…

A: Half life (t1/2) :-  The time required for the concentration of reactant to reduce to half of its…

Q: Chromium-51 is a radioisotope that is used to assess the lifetime of red blood cells The half-life…

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Q: If Bismuth-210 has a half-life of 5.0 days and you started with 30.59 grams and you stopped the…

A: B83210i→AP84210O----(1)P84210O→B+P82206b----(2)As given reaction are nuclear  reactions and all…

Q: What is the half-life (in days) of a 500-mg sample of a certain radioisotope that decays to 25 mg in…

A: Given : initial amount = 500 mg             Final amount = 25 mg       Time = 353.17 hours  Tip :…

Q: calculate how much of a 10.0-g sample of americium-241 remains after four half lives. Americium-241…

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Q: Phosphorus-32 is a radioisotope. It is typically used as a tracer in biological research or to treat…

A: Given,Ordered sample of P32 = 950 mgTime required for shipping = 42.9 daysHalf-life of P32 = 14.3…

Q: If a radioisotope is required to undergo a decay series in order to form a stable isotope at the…

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Q: The carbon−14 decay rate of a sample obtained from a young tree is 0.390 disintegration per second…

A: Radioactive decay is the process by which an atomic nucleus loses energy by radiation to form stable…

Q: The half-life of 223Ra is 11.4 days. How much of a 200.0 mg sample remains after 600 hours?

A: Since,           24 hours = 1 day Therefore, 600 hours = 60024  day…

Q: Cobalt-60 is used extensively in medicine as a source of g-rays. Its half-life is 5.27 years. How…

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Q: The accompanying graph illustrates the decay of 88-42Mo, which decays via positron emission. The…

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Q: Fill in the missing symbol in this nuclear chemical equation. cher 0+HHe +e bio 20

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Q: 40. Tc-99 is often used as a radioactive tracer in several medical diagnostic procedures. It has…

A: (a) Interpretation: The amount of Tc-99 that will remain in the patients body after 24 hours is to…

Q: If the amount of radioactive sodium 24, used for studies of electrolytes within the body, the sample…

A: Given data: Radio active sodium -24 used in the studies of electrolytes within the body. Initial…

Q: If a sample has a half-life of 1 hour, how much of a 10.000 g sample would remain after 2 hours?

A: Any atomic nucleus which is mainly unstable tends to lose energy through radiation and this process…

Q: The following isotopes (listed with their half-lives) have been used in the medical and biological…

A: Activity of any radioactive reactant is given by  Activity = number of particles X decay rate…