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12 Cards in this Set

  • Front
  • Back
Law of Conservation of mass
Law of Definite Proportions
In any sample size of a compound…same proportion of each element + mass
Law of Multiple Proportions
3.) Law of multiple proportions: Compare 2 compounds w/ same 2 elements. Ex: Carbon Monoxide vs. Carbon dioxide same amount of one element… other elements mass will be (small) whole # ratio. 1 gram of carbon-
CO/1.33g CO2/2.66y- 1:2 NOT 1:1.5
Joseph john Tompson
Discovered electron using the cathode ray experiment
Robert Milliken
Measured charge of electron. made it able to discover mass of electron. Used 'plum pudding' model to show how electrons are evenly distributed.
Ernest Rutherford
Discovered the nucleus using the Gold foil experiment.
Ancient greek who first discovered the Atom!
Didnt believe in the atom, thus chemistry was not studied for 2000 years.
John Dalton
Discovered Atomic Theory
Atomic Theory
1.)All matter is composed of atoms
2.) Atoms of the same element are identical
3.) Atoms cannot be subdivided or destroyed, created
4.) Atoms combine in whole number ratios
5.) In reactions, Atoms are combined, separated, or rearranged
Avogadros Number
1 Atomic mass unit