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9 Cards in this Set
- Front
- Back
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law of definite proportions
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a chemical compound contains the same elements in exacly the same proportions by mass regardless of the size of the sample or the source of the compound
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law of multiple proportions
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if two or more different compounds are composed of the 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 combining volumes
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equal volumes of gases at the same temperature and pressure contain equal numbers of molecules
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law of conservation of mass
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mass is neither created nor destroyed during ordinary chemical or physical reactions
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Robert Milikan
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Oil Drop experiment- discovered value of the charge on an electron
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JJ Thompson
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discovered presence of electrons w/ cathode ray tube (they are negatively charged), "plum pudding" atom model
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Gold foil experiment (2 conclusions)
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1. atom has nucleus: round, hard, positively charged
2. atom is mostly empty space |
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James Chadwick
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discovered neutrons: in nucleus, neutral charge, mass is like the proton, electrons have a tiny mass
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John Dalton's atomic theory (the true statements)
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1. atoms of different elements combine in simple whole number ratios to form chemical compounds
2. in chemical reactions, atoms are combined, separated or rearranged |
