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Angela Gregory

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- 1. Open Ended30 seconds1 ptWhy does radioactive decay occur?
- 2. Open Ended30 seconds1 ptHalf-life
- 3. Open Ended30 seconds1 ptRadiometric dating
- 4. Open Ended30 seconds1 ptSolving half-life problems without using the half-life formula
- 5. Open Ended30 seconds1 ptThe half-life of strontium-90 is 29 years. If you started with 10 grams of SR-90, how much would be left after 29 years?
- 6. Open Ended30 seconds1 ptThe half-life of radon-222 is 3.8 days. How much of a 100. g sample is left after 15.2 days?
- 7. Open Ended30 seconds1 ptCarbon-14 has a half-life of 5,715 years. If a sample contains 70 mg originally, how much is left after 17,145 years?
- 8. Open Ended30 seconds1 ptHow much of a 500. g sample of potassium-42 is left after 62 hours? The half-life of potassium-42 is 12.4 hours.
- 9. Open Ended30 seconds1 ptWhat is the half-life of a 100.0 g sample of nitrogen-16 that decays to 12.5 g of nitrogen-16. The half-life time of N-16 is 7.2s?
- 10. Open Ended30 seconds1 ptIf 100 g of gold-198 decays to 6.25 g the half-life of gold-198 is 2.7 days. How much time has passed?
- 11. Open Ended30 seconds1 ptAll isotopes of technetium are radioactive, but they have widely varying half-lives. If an 800.0 g sample of technetium-99 to 100.0 g of technetium-99 in 639,000 y, what is its half-life?
- 12. Open Ended30 seconds1 ptA 208. g sample of sodium-24 decays, how much will remain after 60 hours? The half-life of Na-24 is 15h.
- 13. Open Ended30 seconds1 ptIf half-life of iodine-131 is 8.10 days, after 24.3 days how much of a 50.00 g sample will remain?
- 14. Open Ended30 seconds1 ptThe half-life of hafnium-156 is 0.025 s. How long will it take a 500. g sample to decay to ¼ its original mass?
- 15. Open Ended30 seconds1 ptThe half-life of cobalt-60 is 5.26 years. If 50.0 g are left after 15.78 years, how many grams were in the original sample?
- 16. Open Ended30 seconds1 ptDaughter Isotope
- 17. Open Ended30 seconds1 ptParent Isotope
- 18. Open Ended30 seconds1 ptAs radioactive Parent isotope decrease, stable daughter isotope increases
- 19. Open Ended30 seconds1 ptUses for Radiometric Dating
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