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Unformatted text preview: Lecture Date: Wednesday, September 12, 2007 Announcements: 0 Lecture slides have been posted 1. Representation of Covalent Compounds: A. Element: AxByCz. .. l. A, B and C represent the various elements present in the compound and x, y and 2 represent counts of the atoms of the respective elements. B. Empirical formula: 1. It corresponds to the naming with no common integers between x, y and 2. We only have ratios of quantities of species A to species B to species C. C. Formula unit: 1. It represents the number of atoms in one chemical unit/ molecule. Example: C6H12016 (glucose) This means glucose has 6 units of CHZO in one molecule. D. Structural formula; , 1. It is basically arrangements of atoms and bonds. 2. Example: There are 2 arrangements of C4H10 a. Butane and Methyl propane. b. Both have different properties. 3. Compounds with same number of atoms but different arrangements are called isomers. H H H H | | I | H — C — C — C — C — H Butane (melting point = -O.5 degree Celsius) |||| HHHH ...
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