1. ICP 9/28/12 Half-life

2. Warmup Write a balanced nuclear equation for the alpha decay of Uranium-238.

3. Half-life All radioactive samples decay (break-down) at a set rate. That rate is called the half-life. Half-life – how long it takes for exactly one- half of a radioactive sample to decay.

4. Decay of an Isotope with a half life of 6 days # of Half-livesTimeAmount 0010 g

5. Decay of an Isotope with a half life of 6 days # of Half-livesTimeAmount 0010 g 16 days5 g

6. Decay of an Isotope with a half life of 6 days # of Half-livesTimeAmount 0010 g 16 days5 g 212 days2.5 g

7. Decay of an Isotope with a half life of 6 days # of Half-livesTimeAmount 0010 g 16 days5 g 212 days2.5 g 318 days1.25 g

8. Decay of an Isotope with a half life of 6 days # of Half-livesTimeAmount 0010 g 16 days5 g 212 days2.5 g 318 days1.25 g 424 days0.625 g

9. Decay of an Isotope with a half life of 6 days # of Half-livesTimePercent remaining 00100%

10. Decay of an Isotope with a half life of 6 days # of Half-livesTimePercent remaining 00100% 16 days50%

11. Decay of an Isotope with a half life of 6 days # of Half-livesTimePercent remaining 00100% 16 days50% 212 days25%

12. Decay of an Isotope with a half life of 6 days # of Half-livesTimePercent remaining 00100% 16 days50% 212 days25% 318 days12.5%

13. Decay of an Isotope with a half life of 6 days # of Half-livesTimePercent remaining 00100% 16 days50% 212 days25% 318 days12.5% 424 days6.25%

14. Agenda Work on Half-Life Problems

15. Sample Chart for notes # of Half-livesTimeAmountPercent Remaining 0010 g100%