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19 Cards in this Set

  • Front
  • Back
Law of conservation of mass
mass can neither be created nor destroyed during ordinary chemical and physical reactions
law of definite proportions
a pure compound, whatever its source, always contains definite or constant proportions of the elements by mass
law of multiple proportions
when 2 elements form more than 1 compound, the masses of one element in these coumpounds for a fixed mass of the other element are in ratios of small whole numbers
Dalton
atomic theory
1. elements are made of atoms
2.all atoms of an element are identical
3.atoms of a given element are diff from those of other elements
4.atoms of one element can combine w/ atoms of another element to form compounds. a given compound always has the same relative number and types of atoms
5.atoms are indivisible in chem process. a chemical reaction simply changes the way atoms are grouped together
goldstein
Found protons
Canal Rays
perferated - side
JJ thomson
electrons
Cathode ray tube
found e/m... magnetic field, other path
Milliken
oil drop
calculated electric force
1.6*10^-10 coulomb, mass of electron
Lord Kelvin
plum pudding moddel,electrons=raisins in pudding
Rutherford
gold foil
found nucleus
Chadwick
neutron
did math
Bohr
planet model, energy quantisized
Schrodinger
Wave mechanical model
cathode
-
anode
+
electron
9*10^-31
1.6*10^-19
proton
1.673*10^-27
Neutron
1.675*10^-27
Symbol
A^xX
A= mass
z= atomic number
Isotopes
Same element, diff mass numb. general name=nuclide