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Thegeneral formofanuclearreactionis aa bb

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Unformatted text preview: a current running through the circuit. · When smoke particles interferewith the ions, current is reduced in the circuit, and an alarm goes off. 6 Chemistry 52 Chapter 18 HALF­LIFE · The time it takes for half of any radionuclide to decay is called half­life. Some nuclides have half­ lives o f only seconds, while others have half­life of years. · The rate of decay of any radionuclide fo llows the graph to the right, with each half­life reducing the amount of radionuclide to half of the previous amount. Examples: 1. Iodine­131 has a half­life o f 8 days. What mass of a 40 g sample of iodine­131 will remain after 24 days. 24 days x 1 half­life = 3 half­lives 8 days sample remaining after 3 half­lives = 40 g =5 g 8 2. How long would it take for a sample of C­14 to decay fro m 20.0 g to 0.625 g? (½­life o f C­14=5730 y) ½ Life g 0 20.0 1 2 3 half­lives x 7 4 5730 y = 1 half­life 5 6 7 Chemistry 52 Chapter 18 NUCLEAR REACTIONS · Similar to transmutation, nuclear react ions occur when two or more smaller nuclei combine to form a larger one. · The general form of a nuclear reaction...
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