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ch3 - Molecules Compounds Equations Chapter Goals Interpret...

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Molecules, Compounds & Equations NaCl, salt Buckyball, C 60 Ethanol, C 2 H 6 O Chapter 3 Chapter Goals Interpret, predict, and write formulas for ionic and molecular compounds Nomenclature Properties of ionic compounds More on molar mass Percent composition and derivation of formulas from experimental data. Elements that exist as molecules Atoms of most of the nonmetals form discrete molecules, except for the noble gases: H 2 , O 2 , N 2 , F 2 , Cl 2 , Br 2 ( l), I 2 (s) Some elements can exist in more than one form of molecule; the different forms are called allotropes . Examples are: Diamond, graphite, and buckyballs for carbon. O 2 and O 3 (ozone) for oxygen. Allotropes of C Atomic Solids (molecules) ELEMENTS THAT EXIST AS POLYATOMIC MOLECULES White P 4 and polymeric red phosphorus (P 4 units) Sulfur: crown- shaped rings of S 8 molecules Molecular Compounds: Formulas NAME MOLECULAR CONDENSED STRUCTURAL FORMULA FORMULA FORMULA Ethanol C 2 H 6 O CH 3 CH 2 OH C O C H H H H H H C C H H O H H H H Dimethyl C 2 H 6 O CH 3 OCH 3 ether Ethanol and dimethyl ether are constitutional isomers.
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