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matter that is composed of only one type of atom; cannot be converted to simpler substance by ordinary chemical means
2 or more elements and/or compounds combined in a variable ratio by mass; can be homogeneous or heterogeneous
three laws of chemistry
law of conservation of mass; law of definite proportions; law of multiple proportions
law of definite proportions
compounds contain elements in certain definite proportions and in no other combinations
law of multiple proportions
elements may combine in more than one set of proportions but each set corresponds to a different compound
atomic theory 3
real substances are mixtures of atoms of different elements in different proportions
atomic theory 4
one substance can be changed into another by simply changing the proportions of the element
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