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Early Modern Atomic Theory History
Early Modern Atomic Theory History
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14 Terms
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1
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Aristotle's Theory
all matter can be grouped into four main elements, fire, water, air, and earth
2
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Democritus’s idea-
all matter is made up of tiny, indestructible particles called atoms
3
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alchemy/alchemists
both a philosophy and a hunt for ways to turn lead (or another common material) into gold so the _______ could be closer to God.
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Law of conservation of matter
matter is neither created nor destroyed
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Law of definite proportions-
a given chemical compound always contains its component elements in fixed ratio and does not depend on its source and method of preparation.
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John Dalton's first theory
matter is composed of tiny particles called atoms
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John Dalton's second theory
atoms are fundamental, indestructible, and indivisible particles (he was not correct about all of this)
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John Dalton's third theory
all atoms of a given atom are exactly alike (he was not correct)
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John Dalton's fourth theory
atoms of one element cannot change into another element, but they can combine in simple whole ratios to make compounds
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John Dalton's fifth theory
In a chemical reaction, atoms are separated, combined, or rearranged
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JJ Thomson
___ discovered the electron using the cathode ray tube
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Millikan
____ used oil drop experiment to measure the charge and mass of a single electron
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Rutherford
____ used the gold foil experiment to discover the nucleus
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Chadwick
____ found the neutron
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