Radioactive decay can be described by the following equation In A = In Ao – kt where Ap is the original amount of the substance, A is the amount of the substance remaining after time t, and k is a constant that is characteristic of the substance. -1 For the radioactive isotope radon-222, k is 1.81 x 10- days If the original amount of radon-222 in a sample is 43.8 mg, how much radon-222 remains after 3.53 days have passed? mg Submit Answer Retry Entire Group No more group attempts remain

Radioactive decay can be described by the following equation In A = In Ao – kt where Ap is the original amount of the substance, A is the amount of the substance remaining after time t, and k is a constant that is characteristic of the substance. -1 For the radioactive isotope radon-222, k is 1.81 x 10- days If the original amount of radon-222 in a sample is 43.8 mg, how much radon-222 remains after 3.53 days have passed? mg Submit Answer Retry Entire Group No more group attempts remain

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

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The radioactive decay of Radon-222 follows a first order differential dA/dt = - kA where A is the activity and K is the rate constant. equation If the initial activity of a sample of Radon gas is 10 Bq, the activity after a week is:
c) Lead-210 isotope (21°Pb) is a radioactive pollutant presents in tobacco leaves, which may be one of the cancer-causes for smokers. This lead-210 is originated from several decays of radon-222 typically found in the soil gas and surface air layer in the tobacco fam. i) The possible decay series from radon-222 to produce lead-210 is as follows: 21Po 214Pb Bi 214Po → Pb Compieie ühe decay series by consirucing a suiiabie baianced nuciear reaction equation for each decay step. ii) Lead-210 has a long half-life (fo.5) (approximately 20.4 years). Based on this statement, suggest the reason(s) why high lead-210 content in cigarettes is hazardous for smokers' health.
Radioactive decay can be described by the following equation In A = In Ao – kt where Ao is the original amount of the substance, A is the amount of the substance remaining after time t, and k is a constant that is characteristic of the substance. For the radioactive isotope radon-222, k is 1.81 × 10-1 days. If the original amount of radon-222 in a sample is 69.9 mg, how much time is needed for the amount of radon- 222 that remains to fall to 37.8 mg? days
[References] Use the References to access important values if needed for this question. Radioactive decay can be described by the following equation In A = In Ag - kt where Ag is the original amount of the substance, A is the amount of the substance remaining after time t, and k is a constant that is characteristic of the substance. For the radioactive isotope chromium-51, k is 2.50 x 10-2 days . If the original amount of chromium-51 in a sample is 29.2 mg, how much chromium-51 remains after 30.5 days have passed? mg Submit Answer Retry Entire Group No more group attempts remain
A volcanic eruption melts a large chunk of rock, and all gases are expelled. After cooling, argon- 40 accumulates from the ongoing decay of potassium-40 (half-life of potassium-40 is 1.25 x 10° yr) in the rock. When a piece of rock is analyzed, it is found to contain 1.38 mmol of potassium- 40 and 1.14 mmol of argon-40. How long ago did the rock cool?
Use the References to access important values if needed for this quertion. Radioactive decay can be described by the following equation In A = In Ag - kt where Ao is the original amount of the substance, A is the armount of the substance remaining after time t, and k is a constant that is characteristic of the substance. For the radioactive isotope phosphorus-32, k is 4.85 × 10-* days", If the original amount of phosphorus-32 in a sample is 64.9 mg, how much phosphorus-32 remains after 14.6 days have passed? Jmg Submit Answer Retry Entire Group No more group attempts remain
In order to solve for the rate constant, k, in two steps you must: Step One Add the same expression to each side of the equation to leave the term that includes the variable by itself on the right- hand side of the expression: (Be sure that the answer field changes from light yellow to dark yellow before releasing your answer.) +[A] - kt + [A], Drag and drop your selection from the following list to complete the answer: 1 1 [A.] -[Ao] - [A.] [Ao] Submit
Even though plutonium−239 (t1/2 = 2.41 × 104 yr) is one of the main fission fuels, it is still a radiation hazard present in spent uranium fuel from nuclear power plants. How many years does it take for 94% of the plutonium−239 in spent fuel to decay?
A sabretooth skeleton has a carbon-14 decay rate of 1.90 dis/min/g. If the carbon-14 decay rate in living organisms is 13.6 dis/min/g, when did the sabretooth live? The half-life of carbon-14 is 5730 years.
The alchemist's dream is to produce gold from cheaper and more abundant elements. This dream was finally realized when 18 Hg was converted into gold.-198 by 80 neutron bombardment. 1. Complete the unbalanced nuclear equation below. → ⁹8 Au+? 198 80 2. Gold-198 is radioactive and has a half-life of 2.7 days. Calculate the decay constant.
The half-life of a particular radioactive isotope X is 10.0 days. (1) Determine its decay constant. (2) What will be the number of its nuclei which will be required to produce an activity of 8.0 mCi. (3) A sample of the isotope X with the initial activity decays for 50.0 days. Determine the activity at the end of this period.