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Questions

Use Table 6-1 and Figure 6-8 to help answer the following questions.

1.  Assume you begin with 10.0 g of a radioactive parent isotope. How many grams of parent isotope will be present in the sample after each of the following half-lives? (2 points)

                                                                          Remaining parent isotope

One half-life                                                              _________ g

Four half-lives                                                           _________ g

2.  If a radioactive isotope has a half-life of 400 million years, how long will it take for     

50% of the material to change to the daughter product? (2 points)

3. A sample is brought to the laboratory and the chemist determines that the remaining percentage of the parent isotope is about 13% of the total amount that was originally present. If the half-life of the material is 600 million years, how old is the sample? (2 points)

4. Determine the numerical ages of rock samples that contain a parent isotope with a half-life of 100 million years and have the following percentages of original parent isotope. (2 points)

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