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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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