Lecture_13_Nuclear_Processes - LECTURE NOTES LECTURE 13...

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L E C T U R E N O T E S LECTURE 13 Nuclear Processes GENERAL CHEMISTRY Fall 2008 Updated: 11/22/2011
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Nuclear Composition The radius of a nucleus is 10 -14 m, ten thousand times smaller than the radius of an atom. Nuclei are composed of two protons and neutrons, called nucleons. Nuclear Fission Heavy nuclides fragment in a process called fission. The process of fission was discovered in 1938 by Lise Meitner and Otto Hahn in Germany. The first atomic bomb was detonated in the New Mexico desert at 5:30 AM on July 16, 1945. A. Nuclear Fission 1. A very heavy nucleus splits into more stable nuclei of intermediate mass 2. The mass of the products is less than the mass of the reactants. Missing mass is converted to energy a. Small amounts of missing mass are converted to HUGE amounts of energy (E = mc2) B. Nuclear Chain Reaction 1. A reaction in which the material that starts the reaction is also one of the products and can start another reaction C. Critical Mass 1.
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