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C401Ch22LN2 - Chapter 22 Nuclear Chemistry or...

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Chapter 22: Nuclear Chemistry or RadioChemistry Part 2 Kinetics of Nuclear Decay Reactions Nuclear rxns like ± -decay and ² -decay have 1st order kinetics, that is the rate of the rxn depends on the concentration of the nuclide which is decaying. Since it is 1 st order kinetics, all the equations you learned about 1 st -order kinetics apply: And you can solve the same type of problems! The half-life of Co-60 is 5.3 years. How much of a 1.000 mg sample is left after 15.9 years? How much is left after 17.0 years? A rock contains 0.257 mg Pb-206 per mg U-238. The half-life for the decay of U-238 into Pb-206 is 4.5x10 9 years. How old is the rock? Take-Home Problem: see handout.
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Nuclear Binding Energy You learned that the nucleus is held together by neutrons (and gluons) and the strong nuclear force. What does this mean? It means that it takes energy to hold the nucleus together! The energy required to hold or “bind” the nucleus together is called the nuclear binding energy .
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