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Nuclear Chemistry Ch 18, Pg 666, # 1-8

Nuclear Chemistry Ch 18, Pg 666, # 1-8. #1. What is meant by the half-life of a radioactive nuclide?. #2. Explain how carbon-14 dating is used to determine the age of an object. (Carbon-14 half life is 5.715 x 10 3 years = 5,715 years).

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Nuclear Chemistry Ch 18, Pg 666, # 1-8

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  1. Nuclear Chemistry Ch 18, Pg 666, # 1-8

  2. #1. What is meant by the half-life of a radioactive nuclide?

  3. #2. Explain how carbon-14 dating is used to determine the age of an object. • (Carbon-14 half life is 5.715 x 103 years = 5,715 years)

  4. #3. Why is potassium-40 used to date objects older than 50,000 years old? • (half life Potassium–40 is 1.28 x 109 years)

  5. #4. Identify three practical applications of nuclear chemistry

  6. 5. What fraction of an original sample of a radioactive isotope remains after three half-lives have passed?

  7. #6. How many half-lives of radon-222 (half life 3.82 days) have passed in 11.46 days? If 5.2 x 10-8 g of radon-222 remain in a sealed box after 11.46 days, how much was present in the box initially?

  8. #7. The half-life of proactinium-234 in its ground state is 6.69 h. What fraction of a given amount remains after 26.76 h?

  9. #8. The half-life of thorium-227 is 18.72 days. How many days are required for ¾ of a given amount to decay?

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