CHEM 115aLg Lecture Notes - Lecture 3: Antoine Lavoisier, Atomic Number, Mass Number
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Celsius to fahrenheit calculation: = (cid:2871)(cid:2870)(cid:2869). 8, =(cid:4666) (cid:883). 8(cid:4667)+(cid:885)(cid:884) Antoine lavoisier is the father of modern chemistry: laws of conservation of mass and energy. Dalto(cid:374)"s ato(cid:373)ic theory of (cid:373)ass (cid:449)as highly controversial. A(cid:448)ogadro"s hypothesis: at the same temperature and pressure, equal volumes of different gases contain the same number of particles, # of moles (and particles) are proportional to volume, law of combining volumes. Atom contains: electrons, protons- found in nucleus with positive charge of equal magnitude to the electro(cid:374)"s (cid:374)egati(cid:448)e charge, neutrons- found in nucleus, same mass as proton but with no charge. Thomson discovered the electron through the cathode ray: pass high voltage between cathodes through cathode to fluorescent screen. Put magnets around the tube which deflected the ray in a manner consistent with negative charge. Deflection allowed for calculation of charge : mass ratio. Plum pudding model- electrons are randomly distributed in a cloud of positive charge: disproven pretty soon afterwards.
