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19 Cards in this Set
- Front
- Back
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Law of conservation of mass
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mass can neither be created nor destroyed during ordinary chemical and physical reactions
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law of definite proportions
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a pure compound, whatever its source, always contains definite or constant proportions of the elements by mass
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law of multiple proportions
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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
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Dalton
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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 |
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goldstein
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Found protons
Canal Rays perferated - side |
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JJ thomson
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electrons
Cathode ray tube found e/m... magnetic field, other path |
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Milliken
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oil drop
calculated electric force 1.6*10^-10 coulomb, mass of electron |
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Lord Kelvin
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plum pudding moddel,electrons=raisins in pudding
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Rutherford
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gold foil
found nucleus |
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Chadwick
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neutron
did math |
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Bohr
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planet model, energy quantisized
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Schrodinger
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Wave mechanical model
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cathode
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-
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anode
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+
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electron
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9*10^-31
1.6*10^-19 |
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proton
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1.673*10^-27
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Neutron
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1.675*10^-27
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Symbol
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A^xX
A= mass z= atomic number |
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Isotopes
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Same element, diff mass numb. general name=nuclide
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