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Assume you begin with 10.0 g of a radioactive parent isotope.
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)
