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Happy Thursday!!

Happy Thursday!!. Test Tomorrow!! 5 grams of Selenium-83 decays to .15625 in 25 hours. What is the half-life of Selenium-83? The half-life of strontium-90 is 35 years. If 7.0 grams of strontium-90 is produced, how much will remain after 140 years?. Chemistry. Unit Two Day 6 Kimrey

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Happy Thursday!!

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  1. Happy Thursday!! • Test Tomorrow!! • 5 grams of Selenium-83 decays to .15625 in 25 hours. What is the half-life of Selenium-83? • The half-life of strontium-90 is 35 years. If 7.0 grams of strontium-90 is produced, how much will remain after 140 years?

  2. Chemistry Unit Two Day 6 Kimrey 13 September 2012

  3. Half-Life Lab Quiz • What is the half-life of Pennium, according to your graph? • What was the average count for shake #3? • Which unit could refer to a half-life? • Meter • Second • Liter • Kilogram

  4. If Carbon-12 accounts for 98.92% of a sample, and Carbon-14 is 0.022%, find the % of Carbon-13 in the sample.

  5. This element undergoes beta and gamma decay. Write the equation: • La-138

  6. Magnesium has three naturally occuring isotopes. 78.70% of Magnesium atoms exist as Magnesium-24, 10.03% exist as Magnesium-25 and 11.17% exist as Magnesium-26. What is the average atomic mass of Magnesium?

  7. Fission versus Fusion • Fusion: small atoms coming together to make a bigger atom • occurs on the sun; very hot temperatures • Atoms “fuse” together • Fission: breaking a large atom into smaller atoms (called daughter nuclei) • Natural radioactive decay

  8. This element undergoes alpha and gamma decay. Write the equation: • U-238

  9. Thallium-201 has a half-life of 73 hours. If 4.0 mg of thallium-201 disintegrates over a period of 6.0 days and 2 hours, how many mg of thallium-201 will remain?

  10. Element Math…

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