Suppose the amount of a certain radioactive substance in a sample decays from 7.40 mg to 4.60 mg over a period of 20.6 years. Calculate the half life of the substance. Round your answer to 2 significant digits. I years

Q: The half life for the decay of carbon-14 is 5.73 × 10’ years. Suppose the activity due to the…

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Q: Suppose the amount of a certain radioactive substance in a sample decays from 4.60 mg to 1.90 mg…

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Q: 9. Suppose the amount of a certain radioactive substance in a sample decays from 3.80 mg to 1.70 mg…

A: Reaction in which rate is linearly depend upon one reactant is known as first order reaction.

Q: Be sure to answer all parts. The radioactive decay of thallium-206 to lead-206 has a half-life of…

A: Here we have to calculate number of atom left after 42 minutes-

Q: If you have 1 gm of pure potassium 40 (40K) that is experimentally determined to emit about 105 beta…

A: Activity of 40 K = 105 beta rays. The decay constant λ can be calculated as follows:

Q: The number of radioactive nuclides in a sample decays from 3.80 x to 1020 19 9.50 x 10 in 58.0…

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Q: If the mass of a sample of radioactive cesium-137 decays from 71.9 milligrams to 20.8 milligrams in…

A: The integrated rate law expression for the first-order kinetics is: Half-life relates to the rate…

Q: [Refere A 1.14 g sample of a radioactive isotope decays to 0.87 g in 36.3 hr. What is the half-life…

A: Given  Initial Amount [ A ]0   = 1.15 gram  Remaining Amount [ A ]    = 0.87 gram  Time ( t ) = 36.3…

Q: At the beginning of an experiment, a scientist has 348 grams of radioactive goo. After 75 minutes,…

A: Radioactive decay follow first order kinetics. The integrated rate law for the first order reaction…

Q: The carbon-14 decay rate of a sample obtained from a young tree is 0.256 disintegration per second…

A: Decay process is a first order reaction. Therefore we have to put the integrated rate law for first…

Q: Radioactive Decay The half-life of palladium-100 is 4 days. After 20 days a sample has been reduced…

A: Given Data:  Half life of Pd-100 = 4 days  Reduced mass = 0.375g The formula of half life is given…

Q: Uranium-240 has a half-life of 14.1 hours (note this is NOT a fissionable isotope).  A country with…

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Q: 1. A 1 kg mass of radioactive material was left to decay in a laboratory. After 12 years, the…

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Q: The activity of radioactive carbon-14 decay in a piece of charcoal found at a volcanic site is 11.0…

A: Step 1. Determine decimal fraction of Carbon -14 remaining: 11.018.3=0.601   Step 2. Determine how…

Q: The initial amount of the radioactive material V in a rock is determined to be 6.78 mg. Only 1.46 mg…

A: final answer is = 5.3200 mg

Q: 1.) Carbon-14 has a half-life of 5600 years. If you had a sample of 100% carbon-14, how much would…

A: Given, carbon-14 half life with 100 % carbon-14 sample.we are asked to calculate the amount of…

Q: An isotope of the element erbium has a half-life of approximately 15 hours. Initially there are 23…

A: Given that : The half-life of erbium = 15 hours The initial mass of erbium = 23 g

Q: Q5. The chart shows the mass of a decaying nuclide versus time. What is the half-life of the decay?…

A: The decay constant (k) can be determined by the following equation; k=-1tlnNN0 Here, N is the amount…

Q: a 45.91 mg sample of a pure radioisotope has a half-life of 52 days, what will be the mass of the…

A: Given 45.91 mg sample of a pure radioisotope has a half-life of 52 day mass of the original…

Q: At the beginning of an experiment, a scientist has 228 grams of radioactive goo. After 135 minutes,…

A: Hi! there, since there are multiple questions posted. We are answering first question. If you need…

Q: Carbon-14 has a half-life of 5730 years. In a plant fossil, you find that the 14C has decayed to…

A: Given,                 Isotope = 14C                 Half life =5730 years                 Remaining…

Q: At the beginning of an experiment, a scientist has 244 grams of radioactive goo. After 105 minutes,…

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Q: Suppose the amount of a certain radioactive substance in a sample decays from 6.70 mg to 700. µg…

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Q: Suppose the amount of a certain radioactive substance in a sample decays from 9.40mg to 5.40mg over…

A: Radioactive decay is the first order decay. the formula for calculation of radioactive decay as…

Q: Suppose the amount of a certain radioactive substance in a sample decays from 1.60 mg to 900. µg…

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Q: The half life for the decay of carbon-14 is 5.73 × 10 years. Suppose the activity due to the…

A: Given that : Half-life of carbon-14 = 5.73 x 103 years The activity due to the radioactive decay =…

Q: A skull believed to belong to an ancient human being has a carbon-14 decay rate of 6.50 dis/min.g of…

A: Radioactive disintegration follows first order reaction and decay rate equation can expressed as,…

Q: The carbon-14 decay rate of a sample obtained from a young tree is 0.260 disintegration per second…

A: Initial activity = 0.260 dpspg Final activity = 0.181 dpspg Half life = 5715 year

Q: The carbon-14 decay rate of a sample obtained from a young tree is 0.263 disintegration per second…

A: Solution - According to the question - Given - Ao = initial activity = 0.263dps A = activity at time…

Q: 3. A certain radioactive material is known to decay at a rate proportional to the amount present. If…

A: Solution -

Q: Suppose the amount of a certain radioactive substance in a sample decays from 7.10 mg to 5.20 mg…

A: Radioactive decays are first order reactions. Since we know that the relationship between the amount…

Q: Suppose the amount of a certain radioactive substance in a sample decays from 6.50 mg to 2.40 mg…

A: Radioactive decay is a first-order reaction. On applying the value for rate constant k, we find it…

Q: if 8.000 grams of U-234 are sealed in a container and then opened many years later -- how much time…

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Q: radioactive sample originally contains 8.0g of an isotope with a half- life of 6 days. What is the…

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Q: A radioactive isotope decays from 60 grams to 15 grams in 20 seconds. What is its half-life? a) 20…

A: The radioactive decay is an example of first order reaction.

Q: At the beginning of an experiment, a scientist has 192 grams of radioactive goo. After 90 minutes,…

A: Initial mass, final mass, time required for radioactive goo are given for which relevant questions…

Q: A radioactive material decays at a rate proportional to its amount. If the material has a half-life…

A: To solve this question, first find out rate constant using half life and then use that to find out…

Q: The half life for the decay of carbon-14 is 5.73 x 10³ years. Suppose the activity due to the…

A: We need to calculate age of the wood sample

Q: The half-life of a radioactive nucleus is 1.5·10 -8 s. What is this half-life in milliseconds (ms),…

A: The half-life of the given radioactive nucleus is 1.5×10-8 s. This half-life can be converted into…

Q: The half-life of Radium-226 is 1590 years. If a sample contains 300 mg, how many mg will remain…

A: We are given Radium -226 t1/2=1590 years                  (i) We know radioactive decay always…

Q: 1.50 moles of a radio nuclide emits 3.09 x 1010 beta particles per second. assumed that each beta…

A: Here 1.5 moles of radio active nuclide emits 3.09×10^10 beta particles per second. We have to…

Q: A radioactive isotope has a half life of 60.2 minutes.How long will it take for radiation from a 325…

A: The radioactive decay of an isotope follows a first-order reaction, The integrated rate law for a…

Q: Be sure to answer all parts. The activity of radioactive carbon-14 decay in a piece of charcoal…

A: Radioactive decay follows first order kinetics.  We know that : k = 0.693/t0.5 ...(1)  Here, t0.5 =…

Q: Substance Q initially weights 120% of its remaining mass after its decay in 60 minutes. What is its…

A: Given  substance Q initial weight =120% of its remaining mass after its decay for 60 mins t=60…

Q: 5. A tree falls in a forest. How many years must pass before the carbon-14 mass in the tree's carbon…

A: Suppose Initial amount = Ao Amount at time, t = 3.125% Ao  Half-life, t1/2 = 5570 years

Q: The half life for the decay of carbon-14 is 5.73 × 10’ years. Suppose the activity due to the…

A: We have to calculate the age of artifact.

Q: Suppose a small quantity of radon gas, which has a half-life of 3.8 days, is accidentally released…

A: To calculate the number of days the laboratory remains evacuated

Q: 4. The half-life of radioactive radium-224 is 3.50 days. What was the original mass if 0.200 g…

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Q: Thoron has a high average annual radiation dose according to the graph. Iti eavy radioisotope formed…

A: No

Q: Polonium-210 is a radioactive substance with a half-life of 138 days. If a nuclear facility is…

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Micelles and Biological Membrane

Micelles are the type of lipid molecules that organize themselves in spherical shape in aqueous solutions. The production of the micelle is a reply to the amphipathic behavior of fatty acids. It means that they consist of both hydrophobic regions and hydrophilic regions. In micelles, polar head groups (hydrophilic groups) produce an outer layer associated with water whereas nonpolar tails (hydrophobic groups) are organized in the interior.