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Chemistry 125: Lecture 22 October 26, 2009 Type Theory, Valence Theory & Constitutional Structure (1858) By mid-century there was serious conflict between
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The Phlogiston Theory Georg Ernest Stahl (1660-1734) metal + heat = calx of metal + Ø e.g., zinc = zinc oxide + Ø calx + charcoal(Ø) + heat = metal +
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