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Lect+21+Fall+2011 - ReviewofLastLecture Chapter7 TheFiresof...

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10/20/2011 1 Chapter 7: The Fires of Nuclear Fission (continued) Oct. 21/2011 Review of Last Lecture Strategies for reducing global warming? E=mc 2 Definition of fission Difference between chemical and nuclear reactions 2 Nuclear Equations, Examples 1) U 235 fissions to form Ba 138, Kr 95 and n 0 2) U 235 fissions to form an element ( Z =52, A =137) another element ( Z =40 A =97) and n 0 =137), another element ( =40, 3) U 235 fissions to form Xe 143 and another element ( A =90, Z =?) and n 0 3 Nuclear Equations Notice that both sides contain neutrons, why not cancel them out? n 3 Kr Ba U n 1 0 92 36 141 56 235 92 1 0 + + + On the left, the neutron: On the right, neutrons: 4 Kr n
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