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Chemistry 9 Online
OpenStudy (anonymous):

A certain radioactive element has a half-life of one hour. If you start with 40.0 grams of the element at noon, how much of the radioactive element will be left at 2 p.m.? 20.0 grams 10.0 grams 5.0 grams 0.0 grams

OpenStudy (stephstar101):

After each hour, the amount cuts in half: Noon - 40.0g 1pm - 20.0g 2pm - 10.0g

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