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23 Cards in this Set
- Front
- Back
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Particle Theory supported as early as
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400 B.C.
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Particle Theory was supported by
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Democritus
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The Greek meaning of the word Atom is
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indivisible
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Who did not believe in atoms,
and thought all matter was continuous |
Aristotle
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The transforming of substances to one or more new substances is called a
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Chemical Reation
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1790's study of matter is revolutionized by
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new emphasis on the quantitative analysis of chemical reactions
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Mass is neither created nor destroyed in ordinary physical/chemical changes
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Law of Conservation of Mass
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Chemical compounds have the same elements in exact same proportions by mass regardless of the size or source of compound.
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Law of Definite Proportions
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Two or more different compounds are composed at same two elements, then the ratio of the masses of the second element combined with a certain mass of the first element is always a ratio of small whole numbers.
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Law of Multiple Proportions
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John Dalton in 1808 proposed
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Dalton's Atomic Theory
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All matter is composed of
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Atoms
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Atoms of a given element are identical in what
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size, mass, and other properties.
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Cannot be subdivided created or destroyed
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Atoms
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Atoms of different elements combine in simple whole-number ratios to form
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chemical compounds
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Atoms are combined, seperated, or rearranged
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Chemical reactions
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smallest particle of element that retains the chemical properties of that element
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Atom
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very small region located at the center of an atom
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Nucleus
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made up of at least one positively charged particle
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Proton
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made up of neutral particles
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Neutron
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occupied by negatively charged particles
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Electron
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generated by metal disk, vacuum pump, voltage source, tube, & gas at low pressure
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cathode ray
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deflected by a magnetic field in the same manner as a wire carrying electric current, which was known to have a negative charge
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cathode ray observation
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the rays were deflected away from a negatively charged object
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cathode ray observation
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