Separating mixtures - matter are atoms o atoms in constant...

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Separating mixtures mixture's components have different properties devise a process that selects components with certain properties o density, melting point, boiling point, solubility, reactivity, magnetism, polarity some basic techniques o filtration: select components by particle size o floatation: select components by density o crystallization: select components by solubility o extraction: select components by solubility o distillation: select components by boiling point o chromatography : select components by affinity for a 'stationary phase' Development of the Atomic Theory Problem: why do different materials have different properties? Early models for salt, Early atomists (Leukippos, Demokritos, and Epikouros) o samples can't be subdivided without limit o tiny, discrete, indestructible units of
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Unformatted text preview: matter are atoms o atoms in constant motion through empty space o sizes and shapes of atoms determine all material properties o atoms have mass John Dalton , ca. 1803 o Elements are composed of atoms with characteristic masses. o Compounds are composed of atoms combined in small, whole number ratios. Relationship between elemental composition and atom ratios in molecules. If C and O atoms weigh 12 and 16 units, respectively, the atom ratios in molecules convert to the element mass percentages in compounds. % C by mass % O by mass possible molecules carbon monoxide 42.8% 57.2% CO, C C 3 O 3 , . .. carbon dioxide 30.0% 70.0% CO 2 , C C 3 O 6 , . .. o Chemical reactions rearrange connections between atoms....
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Separating mixtures - matter are atoms o atoms in constant...

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