Lecture 18 - Lecture18 04:16

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Lecture 18 04:16 What % of New Jersey’s electricity comes from nuclear energy? Answer: 50% SOURCE of electricity #1 coal #2 natural gas #3 Nuclear #4 Hydro #5 Oil Nuclear energy generation in the United States 1973 – 2008: Steadily growing up  to 1990. From then to 2008 has les steadily grown. Mostly stayed slightly upward  but not much. Structure of an Atom: Nucleus composed of neutrons/protons together as the  mass. Electrons circulating around outside.  Energy scales of chemical and nuclear reactions: Chemical reactions occur at the atomic energy scale (I.E. changes in the arra  gements of atomic and molecular electrons). The natural unit of energy is the  electron Volt (eV). One eV corresponds to 1.6 x 10^-19 joules Nuclear reactions occur at the Nuclear energy scale (I.E., changes in the  arrangement of the Nuclei of atoms). The natural unit of energy is one million  electron volts (MeV) or  So, for equal masses of reactants, nuclear uses chemical? A different way to consider chemical and nuclear reactions: Change in mass. From Einstien’s formula relating mass and energy: E = Mc^2 In any reaction generating energy, the mass of the final products is less than the  mass of the initial reactants. In chemical reactions, the mass difference is typically very small. Example:
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C + O2   C02 +3.3 X 10^7 J/(KG of C) Since 1 kg of carbon corresponds to 9 x 10^16 J, the fraction of carbon mass  converted to energy is only 4 x 10^-10
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This note was uploaded on 09/05/2011 for the course ENVIRONMEN 0000 taught by Professor Faculty during the Spring '11 term at Rutgers.

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Lecture 18 - Lecture18 04:16

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