Energy Changes in Nuclear Reactions Energy and mass are two sides of the same coin. E = mc 2 c = 3.00 x 10 8 m/s m = mass, in kg E = energy, in J When.

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Presentation transcript:

Energy Changes in Nuclear Reactions Energy and mass are two sides of the same coin. E = mc 2 c = 3.00 x 10 8 m/s m = mass, in kg E = energy, in J When a system loses/gains energy, it loses/gains mass. In chemical reactions, this mass change is nearly undetectable, so we speak of mass as being “conserved,” when it really isn’t. The amount of “mass-and-energy-together,” however, IS conserved. Mass changes in nuclear reactions are much larger than in chemical reactions, and are easily measured. All spontaneous nuclear reactions are exothermic.

Nuclear Binding Energy mass of nucleus mass of nucleons < (when they AREN’T in a nucleus, i.e., if they were separated and massed individually) “Separate: heavier. Tighter: lighter.”

rest masses: n 0 = amu = x 10 –24 g p + = amu = x 10 –24 g e – = amu = x 10 –28 g mass defect = mass of constituent nucleons mass of nucleus – This “missing” mass is converted into energy, which is used to hold the nucleus together. (or “mass deficiency”)

Use mass defect, E = mc 2, and # of nucleons to calculate binding energy per nucleon (BE/n). -- large BE/n means great nuclear stability -- BE/n is largest for Fe-56, meaning: (1) larger-than-Fe-56-nuclei… (2) smaller-than-Fe-56-nuclei… can undergo fusion + ENERGY + Both fission and fusion are exothermic. decay OR can undergo fission

Calculate the binding energy per nucleon of N-14, which has a nuclear mass of amu. 7 p + ( amu) = amu 7 n 0 ( amu) = amu amu m.d. = – = amu amu = x 10 –28 kg = x 10 –12 J/nucleon As a comparison, the BE/n for Fe-56 is 1.41 x 10 –12 J/n, which is 8.79 MeV (1 eV = 1.60 x 10 –19 J).

Nuclear Fission Fission requires… slow-moving neutrons. distance too big; strong force weakens; +/+ repulsion takes over fast n 0 slow n 0 released n 0 ; free to split more nuclei Important fissionable nuclei: U-233, U-235, Pu-239 chain reaction: one nuclear reaction leads to one or more others

critical mass: the mass of fissionable material required to maintain a chain reaction at a constant rate safe critical mass (“Run, Forrest, run!”) supercritical mass supercritical mass: the mass above which the chain reaction accelerates (reaction maintained at constant rate) Little Boy, later dropped on Hiroshima (“Ah jes’ felt lahk runnING.”)