
Chemistry
10th Edition
ISBN: 9781305957404
Author: Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher: Cengage Learning
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Approximately how many half-lives must pass for the amount of radioactivity in a substance to decrease to below 1% of its initial level?
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- A 180.9 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 22.61 ng. How many half-lives of the unknown radioactive substance have occurred? number of half-lives: half-livesarrow_forwardThe half-life for P-32, a radionuclide used in DNA sequencing, is 14.28 days. Calculate the percentage of P-32 remaining after 94.2 days. Use 3 significant figures for the percentage.arrow_forwardPd-100 has a half-life of 3.6 days. If one had 6.02x10^23 atoms at the start, how many atoms would be present after 20.0days?arrow_forward
- Technetium-99m, an important radionuclide in medicine, has a half-life of 6.0 hours. What percentage of a sample of technetium-99m will remain undecayed after the following times?12 hours1 day 6 half- livesarrow_forwardHow many hours are needed for a 16.0 g sample of Si-31 to decay to 2.0 g? The half-life for Si-31 is 2.6 h.arrow_forwardThe half life of radium-226, the first radioactive element discovered, is 1,620 years. If a sample of material contains 16 milligrams of radium-226, how log will it tale for the sample to contain 1 milligram of radium-226?arrow_forward
- 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.arrow_forwardA bone has a carbon-14 decay rate of 4.98 disintegrations per minute per gram of carbon. If a living organism has a decay rate of 15.3 disintegrations per minute per gram of carbon, how old is the bone? The half life of carbon-14 is 5715 years.arrow_forward
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