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9 Cards in this Set

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  • Back
law of definite proportions
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
law of multiple proportions
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
law of combining volumes
equal volumes of gases at the same temperature and pressure contain equal numbers of molecules
law of conservation of mass
mass is neither created nor destroyed during ordinary chemical or physical reactions
Robert Milikan
Oil Drop experiment- discovered value of the charge on an electron
JJ Thompson
discovered presence of electrons w/ cathode ray tube (they are negatively charged), "plum pudding" atom model
Gold foil experiment (2 conclusions)
1. atom has nucleus: round, hard, positively charged
2. atom is mostly empty space
James Chadwick
discovered neutrons: in nucleus, neutral charge, mass is like the proton, electrons have a tiny mass
John Dalton's atomic theory (the true statements)
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