A 739.7 ng sample of an unknown radioactive substance was placed in storage and its mass measured periodically. After 47 days the amount of radioactive substance had decreased to 92.46 ng. How many half‑lives of the unknown radioactive substance have occurred?

Q: Which of these terms describes the following process? 230PU 235½U + %He2* A) Chemical B) Fusion C)…

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

Q: If the amount of a radioactive element decreases from 0.36 g to 90. mg in 22 min, what is its…

A: Half-life (t1/2) is defined as the time required by a substance to reduce to half of its initial…

Q: Pls. refer to the given answer choices so that i will know if my solution is wrong

A: 100% undecayed  at time 0 .

Q: How many half‑lives of the unknown radioactive substance have occurred?

A: As we know that decay of radioactive substance follows first order kinetics

Q: Carbon-14 Original amount: 60.0 g Amount left: 3.75 g Total time: Half-life: 5730 y Number of…

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Q: hat are the 19 artificial radioactive elements?

A: The elements the following uranium on the periodic table are only produced artificially and are…

Q: What symbols are used to denote alpha and beta particles ? Where do these particles come from ?

A: Given Particle  Alpha Particle  Beta Particle  Symbols of particles = To be determined

Q: How does nuclear fission differ from nuclear fusion? Why are both of these processes exothermic?

A: Nuclear fission differ from nuclear fusion and  both of these processes are exothermic or not need…

Q: How much of a 100. g sample of Gold (Au-198) is left after 8.10 days?

A: Atoms of higher atomic masses are unstable and decays to give stable atoms.  These are generally…

Q: A radioactive sample contains 1.55 g of an isotope with a halflife of 3.8 days. What mass of the…

A: Given details, t1/2 = 3.8 days t = 5.5 days m0 = 1.55 g To calculate the mass of the isotope. By…

Q: The Br-82 nucleus has a half-life of 1.0 x 103 min. If you wanted 1.0 g Br-82 and the delivery time…

A: The radioactive decay of Br-82 is an example of first order reaction. The rate constant of the…

Q: The half-life of Oxygen-14 is 1.177 minutes.  You originally have 20 grams of it.  After roughly 3.5…

A: Given: Half-life of Oxygen-14 is 1.177 minutes Mass of Oxygen-14 is 20 g

Q: Sulfur-38 Original amount: 5.0 g Amount left: c Total time: 8.61 h Half-life: 2.87 h Number of…

A:

Q: Of an initial amount of7000g of​ lead-210, how much will remain in120​years? Lead-210 decays at a…

A:

Q: A sample of Thorium-228 has a half life of 1.9116 years. what percent of thorium 228 remains after…

A: Let the initial amount be A0After the first half-life the amount remaining is

Q: After 5.0 × 105 years, how much of the sample of Krypton-81 would remain?

A:

Q: How much (in grams) of a 17.2-g sample of some radioactive element (half-life of 4 days) remains…

A: The given mass of the substance =  17.2 g The half-life of the substance (t1/2) = 4 days Time…

Q: Complete the following nuclear bombardment equation by filling in the nuclear symbol for the missing…

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Q: Fill in the name of the missing radioactive particle by entering "alpha", "beta" or "positron" 179…

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Q: Fill in the name of the missing radioactive particle by entering "alpha", "beta" or "positron" 175…

A: The spontaneous process of breakdown of an unstable heavy atom by emitting radiation is called…

Q: If 10 grams of Uranium underwent three half-lives; how much uranium would be left?

A: The time in which half of the initial amount of the reactants convert into the product known as half…

Q: Iodine 1 31 has a half life of about 8 days.  In 40 days what percent of the original sample would…

A: Formula used :-  t1/2 = .693/k  Where k is rate constant. k = 2.303/t log [A0]/[A]

Q: Phosphorus-32 has a half-life of 14.0 days. Starting with 6.00 g of 32P, how many grams will remain…

A: Given: The half-life of phosphorus -32 =14.0 days i.e. t1/2=14.0 days Starting amount of P=6.00 g

Q: Krypton-85 has a half life of 10 years. Approximately what percentage of Kr-85 produced from the…

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Q: The half life of bismuth-213 is 46 minutes.  How much of a 20 g sample of bismuth-213 is left after…

A: The unstable nucleus or isotope undergoes radioactive decay to form a stable nucleus. This process…

Q: The half–life of a radioactive material is 7.04 days. Assuming you start with a 1.45 mg sample, how…

A: Given , Half life = 7.04 days Time , t = 16 days Initial Weight of sample = 1.45 mg

Q: The radioactive nuclide Co has a half-life of 8.5 hours. What mass of Co remains from a 0.0196 g…

A: Half life = 8.5hrs  Mass = 0.0196g  t = 18hrs

Q: Lead-204 has a half-life of 15 minutes. Suppose there are initially 100 Pb-204 atoms. After 30…

A: The time in which half of the initial amount of the reactants convert into the product known as half…

Q: A 169 ng sample of radioactive material has a half life of 3.9 days. How many ng of radioactive…

A: Sample of redioactive material=169ng Half life=3.9days

Q: A certain radioactive material is known to decay at a rate proportional to the amount present. If…

A: Consider the given information is as follows; Initial amount N0 = 500 mg Amount after 3 Nt years =…

Q: How does half-life relate to radioactive decay?

A: The half-life (t1/2) is the time required by any quantity to reduce half of its initial value.

Q: How much of a 24-gram sample of Radium-226 will remain unchanged at the end of three half-life…

A: 19) Given : Initial mass of radium-226 = 24 g And time passed = 3 half lives.

Q: If the initial sample is 8.25 g, what mass of the original iridium‑192 remains after 105 days?

A: The nuclear reactions are a type of chemical processes which lead to the formation of some new…

Q: Explain the differences between the chemical reactions and the nuclear reactions

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Q: 20) Determine the missing particle in radioactive decay: 119 a) so 244 b) Pu => He + 94

A: This problem can be solved using the concept of mass and charge balance.

Q: 145 g sample of radioactive has a half live of 6.4 days how many g of material is left are 2 half…

A: The time required to disintegrate the molecule to half of its initial concentration is called the…

Q: A radioactive sample contains 2.90 gg of an isotope with a half-life of 3.8 days How much of the…

A: Given- Initial mass = 2.90 g Half life = 3.8 days To find- mass of the isotope in grams remaining…

Q: U-235 was bombarded with a neutron producing Cs-144 and Rb-90. How many excess neutrons are released…

A: Nuclear transmutation is the process in which one chemical element is converted into new chemical…

Q: 233ра 'Pa

A: Radioactive decay series: It is series of radiochemistry in which transformation of one radioactive…

Q: A radioactive sample contains 2.45g. How much willl remain after 11.4 days? (Half life is 3.8 days)

A:

Q: In the following equation, what particle or type of radiation decay is needed in order to balance…

A: In the nuclear reaction by the bombardment of nuclear particle or by the emission of nuclear…

Q: In the thorium decay series, thorium-232 loses a total of 6 α particles and 4 β particles in a…

A: The final isotope is Lead-208.

Q: Explain the meaning of the term critical mass in relation to the use of a chain reaction for the…

A: Answer: Controlled nuclear chain reaction is used in which nuclear fission takes place to produce…

Q: If there were 300 grams of carbon-14 originally present, how many years would it take for there to…

A: Interpretation -  To determine how many years would it take for there to be 90 grams of carbon-14…

Q: Phosphorus-32 has a half-life of 14.0 days. Starting with 4.00g of P, how many grams will remain…

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Q: In a natural decay series, how many α and β⁻ emissions peratom of uranium-235 result in an atom…

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Q: A radioactive sample has a mass of 500 grams. How much remains after two half-lives?

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Q: A radioactive iodine sample has a half life of 6 days. If the original sample is 24 grams, how much…

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Q: The radioactive nuclide Co has a shelf-life of 17.5 hours. What mass Co remains from 0.0100g sample…

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