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Chem Prelim - Chem Prelim#1 Review-physical change doesn't...

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Chem Prelim #1 Review -physical change: doesn’t change composition…chemical change: does change composition -* only mixtures can be separated by a physical process (filtration, distillation (pure water condensed from vapor), chromatogroaphy) -C F=9/5C + 32 -extensive property: dependent on quantity of matter…intensive: independent of quantity -in dealing with volume/density/mass always convert kg to g -percent composition : sweater containing 3.5% NaCl by mass = 100g/3.5 g NaCl -sig figs: decimal point present (left right until a nonzero is hit)…absent (right left) -mass is conserved -law of constant composition/ law of definite proportions: all samples of a compound have the same composition (same proportions by mass of constituent elements) - dalton’s atomic theory mass is conserved, elements combine in fixed mass ratioslaw of multiple proportions: if 2 elements form more than a single compound, the masses of 1 element combined with a fixed mass of the second one are in the ratio of a small whole number -
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