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15 Cards in this Set

  • Front
  • Back
Particle theory of matter
made by democritus, cme up with the idea of an atom beign the smallest subunit
rejected the idea of the atom, ideas were lated rejected
law of conservation of mass
matter can be neither created or destroyed by oridinary chemical reactions or physical changes
law of definite proportions
same element in exacly teh same proportion will have the same mass no matter the sie of the smaple or the source of the compound ex: NaCl
law of multiple proportions
two or more compounds with same elements then the ratio of the first will always be uneven ex: oxygen and carbon and carbon monoxide and carbon dioxide
Dalton's Atomic Theory
1. made of atoms
2. identical in size, mass, and other properties
3. atoms cant be subdivided
4. whole number ratios
5. in chemical reaction they rearrange
Modern Atomic Theory
1. composed of atoms]
2. atoms of one element are differnet in properties from another element
in nucleus,neutral with equal numbers of p and n, 1.673*10^-27
surround nuclues, very large, large charge to mass ratio, 9.019*10^-31
in nucleus, 1.675*10^-27
cathode ray
electric current was run through various gasses at low pressures, surface of tube opposite of cathode glowed, rays were defelcted by a magnetic feild, deflected by a negative charged object
gave us the "electron"
measured the charge of the electron, 9.019*10^-31
bombarded gold foil with alpha particles, thought that it must haev been defelected by a bundle of postively charged
nuclear force
proton-neutron, proton-proton, neutron-neutron nonds that hold the particles in place