half life practice
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Half Life Practice. You have 5g of sodium 25. How much would you have after 3 half lives?. Step 1: 25 12.56.25 6.25g remain. Now You. C14 has a half life of 5730 years. If you had 88g, how much C14 would remain after 5 half lives?. Step 1: 88 4422115.52.75g. - PowerPoint PPT PresentationTRANSCRIPT
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HALF LIFE PRACTICE
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YOU HAVE 5G OF SODIUM 25. HOW MUCH WOULD YOU HAVE AFTER 3 HALF LIVES?
Step 1:2512.56.256.25g remain
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Now You
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C14 HAS A HALF LIFE OF 5730 YEARS. IF YOU HAD 88G, HOW MUCH C14 WOULD REMAIN AFTER 5 HALF LIVES?
Step 1:884422115.52.75g
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ACTINIUM 226 HAS A HALF LIFE OF 28 HOURS. 100 G OF ACTINIUM 226 DEGRADES OVER 56 HOURS. HOW MUCH WILL BE LEFT?
Step 1: 56/28=2Step 2: 100g50g25g
25g
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Now You
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AFTER 11,200 YEARS, A SAMPLE OF RADIUM-226 HAS DECAYED. IT HAS A HALF-LIFE OF 1600 YEARS. THE SAMPLE WAS ORIGINALLY 162 GRAMS. HOW MUCH IS LEFT?
Step 1: 11,200/1600=7Step 2:
1628140.520.2510.1255.0625 2.53125
2.53125g
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THE HALF LIFE OF ISOTOPE X IS 2 YEARS. HOW LONG WOULD IT TAKE FOR 4G TO DECAY TO .5G?
Step 1: 421.5(3 Half lives have passed)Step 2:3X2years=6 years
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NOW YOU
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CARBON HAS A HALF LIFE OF 5730 YEARS. HOW LONG WOULD IT TAKE 100G TO DECAY TO 25 GRAMS?
Step 1:1005025 (2 half lives have passed)Step 2:5730 years X 2=11460 Years
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A SAMPLE INITIALLY CONTAINS 60G OF THORIUM 234. AFTER 48 DAYS ONLY 7.5 GRAMS REMAIN. HOW LONG IS ONE HALF LIFE?
Step 1: 6030157.5 (3 half lives have passed)
Step2: 48/3=16
16 days
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Now You
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WE START WITH 500G OF ISOTOPE X. IN 10,000 YEARS WE END WITH 7.8G. HOW LING IS ONE HALF LIFE FOR ISOTOPE X?
Step 1: 50025012562.531.2515.67.8
(6 half lives have passed)Step 2: 10,000/6 = 1666.66
One half life is 1666.66 years