1 A radioisotope has a half life of 4 days. How much of a 20-gram sample of this radioisotope remains at the end of each time period? A. 4 Days B. 8 Days 2 The mass of Cobalt-60 in a sample is found to have decreased from 0.800 grams to 0.2000 grams in a period of 10.5 years. From this information, calculate the half-life of Cobalt-60

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Chapter1: Chemical Foundations
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1 A radioisotope has a half life of 4
days. How much of a 20-gram
sample of this radioisotope
remains at the end of each time
period?
A. 4 Days
B. 8 Days
2 The mass of Cobalt-60 in a
sample is found to have
decreased from 0.800 grams to
0.2000 grams in a period of 10.5
years. From this information,
calculate the half-life of
Cobalt-60
3 Carbon-14 has a half life of about
5,730 years. It an archeologist
examines a bone and finds 6.25%
Transcribed Image Text:Question 1 A radioisotope has a half life of 4 days. How much of a 20-gram sample of this radioisotope remains at the end of each time period? A. 4 Days B. 8 Days 2 The mass of Cobalt-60 in a sample is found to have decreased from 0.800 grams to 0.2000 grams in a period of 10.5 years. From this information, calculate the half-life of Cobalt-60 3 Carbon-14 has a half life of about 5,730 years. It an archeologist examines a bone and finds 6.25%
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