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: QUESTION 1 What is the radioactive particle released in the following nuclear equation? 90 38 Sr- →…

A: Nuclear reaction: A nuclear reaction must cause a transformation of at least one nuclide to another.…

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: The amount of radio active material present at time t is given by A=Aoekt, where Ao is the initial…

A: For a first order reaction, the rate of reaction is proportional to the first power of concentration…

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: 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: 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: 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: 18° Re is used in the treatment of bone cancer. The half-life of 180 Re is 3.72 days. If you begin…

A: Given: Half-life of isotope = 3.72 days. The initial mass of isotope =1.76 µg And time passed = 18.6…

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: 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: 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: Fill in the missing symbol in this nuclear chemical equation. 1 + H X

A: Fill in the missing symbol in this nuclear chemical equation,? + 10 n -----> 3215 P  +  11HAs we…

Q: Iron-59 is a radioisotope used to study iron metabolism in the spleen. It has a half-life of 44.5…

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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: Sodium24, which is used to locate blood clots in the human circulatory system, has a halflife of…

A: Consider the given information is as follows; Order of the reaction = 1 (as radioactive decay)…

Q: Nitrogen-13 has a biologic half-life of 2.84 minutes and emits positrons.    If a patient is…

A: Initial concentration of nitrogen-13 = 500.0 micrograms  Half- life = 2.84 minutes  Half-life means…

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 age of water samples or aqueous solutions can be determined by determining the radioactive…

A: see attachmentExplanation:Step 1: Step 2: Step 3: Step 4:

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

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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…

Q: sodium-24 is a radioisotope used to measure blood circulation time. Calculate the mass (in…

A: Original mass of Na-24 sample = 26.6 mg Half life = 4 hours Mass of sample after 1 day and 4 hours…