Nuclear Chem Energetics

Nuclear Chem Energetics - Nuclear Chem Slide 26 Nuclear...

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1 Nuclear Chem Slide 26 Nuclear Chem Slide 27
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2 Nuclear Chem Slide 28 Nuclear Energetics When protons and neutrons form a nucleus, or when a nuclear reaction occurs, energy is released; why? 1 amu = 1.6605 x 10 -27 kg That is, the products have less mass than the starting materials! Mass must have been converted to Energy! 14 C 14 N+ 0 e 6 7 -1 13.999950 amu 13.999234 amu 0.000549 amu m = -1.67 x 10 -4 amu Nuclear Chem Slide 29 Nuclear Energetics: Energy Equivalents Examination of nuclear mass changes help us to understand stability differences. Consider a free neutron (t 1/2 = 12 min): This will give a m = -1.395 x 10 -30 kg and E = -1.254 x 10 -13 J/neutron For single-atom calculations it is more convenient to use electron volts (eV) rather than joules; 1 eV = energy given to an atom when accelerated thru a potential of 1.00 V: E = Q E o , where E (in J), Q (in C) and E o (in volts) So 1 eV = 1.602117 x 10 -19 J and 1 MeV = 1.602117 x 10 -13 J 1 n 1 p + 0 e 0 1 -1 1.00866490 amu 1.00727647 amu 5.4857990 x 10 -4 amu m = -8.398510 x 10 -4 amu
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3 Nuclear Chem Slide 30 Nuclear Energetics: Energy Equivalents
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Nuclear Chem Energetics - Nuclear Chem Slide 26 Nuclear...

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