A specimen of charcoal found contains 57% as much 14C as a sample of present day charcoal. What is the age of the sample? (14C has a known half-life of about 5700 years.)   A. 4622.51 yrs   B. 6940.27 yrs   C. 5147.88 yrs   D. 7490.48 yrs

Q: The radioactive decay of a sample containing an unknown radioactive isotope produced 6274…

A: Given Initial disintegration = 6274 Final disintegration = 1898 Time = 15.31 days

Q: Skeletal remains had lost 85%of the C-14 they originally contained. Determine the approximate age…

A:

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

A:

Q: 29) a rock from the moon was found to contain 1.0 x 10* g (A,) of uranium-238 and 4.0 x 10“ g…

A: The half-life of a radioactive isotope (t1/2 ): All radioactive decay first-order reaction kinetics.…

Q: 7) The half life of silicon is 710 years. 40 grams are present now, how much will be present in 200…

A:

Q: A piece of a spear handle is found in an archaeological dig in Central America. It contains 42.1% as…

A: Given: Amount of isotope in handle = 42.1 % of a living tree. And the half-life of the isotope…

Q: Half-life is the time required for a radioactive element to decay to half of its original mass.…

A: Given: The % of original radium sample=100% The % of a sample of radium that has decayed=75% The…

Q: How much of a 24 g sample of radium 226 will remain unchanged at the end of 3 half-life periods?

A: Given,  Mass of the sample of radium 226 = 24 g  Mass of the sample of radium 226 remain unchanged…

Q: Torgeir is on a geology field trip and finds a meteorite that contains 10 times more argon-40 than…

A: Radioactive decay of material follows first order kinetics.  Half life is defined as the time…

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: In a dusty corner of a spooky abandoned lab, you find a vial labeled “70g of iron-55”.  You weigh…

A: Welcome to bartleby !  We have to calculate time required

Q: An ancient skull has a carbon-14 decay rate of 0.75 disintegrations per minute. The living organisms…

A: Chemical changes in which amount of species taken varies or changes linearly with time are said to…

Q: A piece of a spear handle is found in an archaeological dig in Central America. It contains 12.5% as…

A:

Q: 32.  A specimen of charcoal found contains 57% as much 14C as a sample of present day charcoal. What…

A: Given : Half life = 5700 years

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: The radioactive isotope carbon-14 is used for radiocarbon dating. The half-life of carbon-14 is…

A:

Q: 3. An archeologist unearths a bone sample and wants to know the age of the initial amount of…

A: Given:  Present amount of bone = 49 %  Half life = 5730 years

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: about how much would have been left after three half-lives? A parent isotope has a half-life of 500…

A: Note : As per guidelines we can answer only the first question   The time it takes for the…

Q: (19] There are 40 grams of radioactive substance at one point in time. After two hours, only 30…

A: The half-life of a quantity is the amount of time it takes to decrease to half of its original…

Q: Carbon 14 decays to carbon12. The half-life of the C14 isotope is 5730 years. 3000 years after an…

A:

Q: An archeological sample was predicted to be 9,415 years old. If the C-14 measured at present in the…

A:

Q: A radioactive sample contains 1.55 g of an isotope with ahalf-life of 3.8 days. What mass of the…

A: Radioactive isotopes may occur naturally or be artificially produced. Radioactive isotopes possess…

Q: An old wooden bowl unearthed in an archeological dig is found to have one‑fourth of the amount of…

A:

Q: An analytical laboratory balance typically measures mass to the nearest 0.1 mg. What energy change…

A: Given : Loss of mass = 0.1 mg  Since 1 Kg = 1000 g  And 1 g = 1000 mg => 1 Kg = 106 mg Hence mass…

Q: Francium-223 is a radioactive isotope with a half-life of about 22 minutes. How much time will it…

A:

Q: A piece of a spear handle is found in an archaeological dig in Central America. It contains 41.7% as…

A: Given, half life of C14 = 5730 yr

Q: A scientist is taking measurements on an unknown isotope to determine its half life. If the…

A: Radioactive decay is followed first order kinetics  Decay constant                  λ =2.303t…

Q: 1) Phosphorus-32 has a half-life of 14.0  days . Starting with 4.00  g  of  32P , how many grams…

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

Q: Define the term half-life as used in radioactivity. The half-life of carbon-14 is 5730 years. If the…

A: Half life in Radioactivity : It is the time required by a radioactive nuclei to decay to exactly…

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

A:

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: 24. A radioactive substance weighing 18.00 grams undergoes radioactive decay in 12.5 days and has…

A:

Q: Naturally occurring uranium is composed mostly of 238U and 235U, with relative abundances of 99.28%…

A:

Q: An archaeologist finds some ancient jewelry made from bone. The jewelry has a carbon mass of 482 g…

A: Nuclear decay follows 1st order reaction.  Given the half-life of C-14, t1/2 = 5730 year…

Q: The half-life of carbon-14 is 5730 years. What does this statement mean? [A] It means that carbon-14…

A: Given: The half-life t12 of carbon-14 is 5730 years

Q: A 50.0 mg sample of an unknown radioactive substance was placed in storage and its mass measured…

A:

Q: chemist determines that a sample of petrified wood has a decay rate of 6.00 counts/minute-gram. What…

A:

Q: Naturally occurring uranium is composed mostly of 238U and 235U, with relative abundances of 99.28%…

A: Given, relative abundance : U238=99.28 % U235=0.72% Half life : t1/2 of U238=4.5×109 yr t1/2 of…

Q: The radioactive decay of Cs-137 is displayed in the plot below. 100 90 80 70 60 50 40 30 20 10 20…

A: We have to calculate  A. Half life  B.mass left  C. Percentage of original sample left

Q: Carbon-11 is a radioactive isotope of carbon. Its half-life is 20.3 minutes. What fraction of the…

A: When the rate of the reaction is directly proportional to the first power of the concentration of…

Q: carbon-14 activity

A: Given data, Basic equation is Ae = Ao x 0.5 (t / t1/2)   Therefore,

Q: rock containing 238U and 206Pb was examined to determine its approximate age. The molar ratio of…

A:

Q: The half life of Pa-234 is 6.75 hours. What fraction of a sample of this isotope remains after 27…

A: The half-life period of radioactive elements can be expressed as: λ=0.693t1/2

Q: Naturally occurring uranium is composed mostly of 238U and 235U, with relative abundances of 99.28%…

A: Decay constant for 238U can be calculated as: λ=0.693t12=0.6934.5×109years-1 Decay constant for 235…

Q: 1. A sample of einsteinium-252 decayed to 64.3% of its original mass after 300 days. a) What is the…

A: The rate law for the 1st order reaction is given by, k=1tln[A]0[A] where k is the rate constant, t…

Q: The 175Pt isotope has a half-life of 2.53 seconds. What percentage of the original quantity of 175Pt…

A: The radio active decay follows first order kinetics. The half life t1/2 and rate constant K of a…

Q: The cesium-137 has a half life of 30 years after 90 years about 10g.remains. the original mass of…

A:

Writing and Balancing Nuclear Equations

A nuclear equation is a symbolic representation of a nuclear reaction using certain symbols. It is studied in nuclear chemistry and nuclear physics.