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3.125%

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Station __: If we start with 120 atoms of a radioactive substance, how many will remain after 5 half lives. Show your work.

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3.75 atoms

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Station __: When you analyze a rock sample you find that only 6.25% of the original Carbon-14 remains. Knowing that Carbon-14 has a half life of 5,730 years, how old is the rock approximately? Show your work.

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22,920 years

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Station __: If a sample know to be about 11,460 years old has 400 Carbon-14 atoms, how many atoms were in the sample when the organism died? The half life of Carbon-14 is 5,730 years. Show your work.

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1600 atoms

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Station __: Sodium-24 has a half-life of 15 hours. How much sodium-24 will remain in an 18.0 g sample after 60 hours? Show your work.

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1.125 GRAMS

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Station __: After 42 days a 2.0 g sample of Phosphorus-32 contains only .25 g of the isotope. What is the half-life of phosphorus-32? Show your work.

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14 Days

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Station __: Polonium-214 has a relatively short half-life of 164 seconds. How many seconds would it take for 8.0 g of this isotope to decay to .25 g? Show your work.

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820 secs

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Station __: How many half-lives does it take for 16 g of Palladium-103 to decay to 1.0 g? Show your work.

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4 half lives

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Station __: What percentage of the original sample of Copper-66 would remain after 51 minutes if the half-life is 5.10 minutes? Show your work.

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.1 %

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Station __: In 5.49 seconds, 1.20 g of Argon-35 decays to leave only 0.15 g. What is the half life of Argon-35? Show your work.

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1.83 secs

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Station __: How much of a 30.0 gram sample of a substance will be left after 2 hours if the half-life is 15 minutes? Show your work

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.117 grams

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Station __: The half-life of Thorium-27 is days. How many days are require for 5.5 grams to remain if you start with 88 grams? Show your work

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74.88 days

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Station __: The half-life of Cobalt-60 is 5.26 years. If 25 grams are left after years, how many grams were in the original sample? Show your work

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3200 grams

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Station __: The half life of Zinc-71 is 2.4 minutes. If one had 100 g at the beginning, how many grams would be left after 7.2 minutes. Show work.

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12.5 Grams

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Station __: After 48 days, 2 grams of an original 128 gram sample remain. What is the half-life of the sample? Show work.

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8 Days

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Station __: The half-life of Iodine-131 is about 8 days. What percentage of an Iodine-131 sample will remain after 40 days? Show work.

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H ALF L IFE P RACTICE. Y OU HAVE 5 G OF SODIUM 25. H OW MUCH WOULD YOU HAVE AFTER 3 HALF LIVES ? Step 1: 25 12.5 6.25 6.25g remain.

H ALF L IFE P RACTICE. Y OU HAVE 5 G OF SODIUM 25. H OW MUCH WOULD YOU HAVE AFTER 3 HALF LIVES ? Step 1: 25 12.5 6.25 6.25g remain.

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