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matter, the discoveries 4.2, Laws of some compounds/elements, the…
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the discoveries 4.2
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Using Oil-drop
Robert Millikan
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he could calculate the mass of electrons by using the ratio (charge of e/mass of e) the mass: "9.1 x 10^-28"
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Using Nuclear Model
Rutherford
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Some alpha particles are deflected, so theres something in the middle (something in the middle that has mass, most of the atoms mass)
the deflection of the alpha particles = repulsive force between the nucleus and the alpha charges so the nuclues is positively charged
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the discoveries 4.1
Dalton
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Atoms of a given element are identical in size, mass, and chemical properties.
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In a chemical reaction, atoms are separated, combined or rearranged.
Democritus
Matter is composed of atoms, which move through empty space.
Atoms are solid, homogeneous, indestructible, and indivisible.
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Size, shape, and movement of atoms determine the properties of matter.
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Aristotle
Empty space cannot exist, disagreed with democritus
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types of mixtures
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homogeneous mixtures
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has a constant composition, uniform
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