11-7-08%20-%20Lecture%2015%20-%20Chapter%203%20%26%20Fund.%20H%2cI

11-7-08%20-%20Lecture%2015%20-%20Chapter%203%20%26%20Fund.%20H%2cI

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Heteronuclear Diatomic Molecules
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Molecular Orbitals and Color
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Band Theory- valence electrons donated by atoms are spread over the entire structure.
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Al Metal and MOs Al Metal and MOs 2000 MOs 2000 MOs Use 1000 Al atoms and get 4000 MOs Have 3000 e- or 1500 pairs This fills the bottom levels 3/4 of the way.
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Electrical Conductivity Electrical Conductivity Conduction band Filled levels + e- Empty levels Add energy Valence band
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Band Structure
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Chemical Reactions
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Law of Conservation of Mass Because the same atoms are present in a reaction at the beginning and at the end, the amount of mass in a system does not change. chemical equations must be balanced they must have the same number of atoms of the same kind of atom on both sides stoichiometric coefficients 2 H 2 (g) + O 2 (g) → 2 H 2 O (g)
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Meaning of Chemical Equations 4 Al (s) + 3 O 2 (g) → 2 Al 2 O 3 (s) This equation means: 4 Al atoms + 3 O 2 molecules give 2 units of Al 2 O 3 BUT it also means: 4 moles of Al + 3 moles of O 2 give
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11-7-08%20-%20Lecture%2015%20-%20Chapter%203%20%26%20Fund.%20H%2cI

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