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Unformatted text preview: 1 Lecture 07 Chemical Compounds Moles of Compounds 3.8 Percent Composition 3.9 Determining Empirical and Molecular Formulas 3.10 The Biological Periodic Table 3.11 Lecture 07, Knowledge and Skills Know what ionic hydrates are Calculate molar mass from formula Perform mass-to-mole conversions Perform mole-to-mass conversions Calculate mass percent Determine empirical formulas from known mass percent Determine molecular formula from empirical formula plus information on molecular mass Know the most important elements in biological systems Ionic Hydrates Ionic hydrate: ionic compound with water trapped in the crystal Examples Examples MgSO 4 7H 2 O magnesium sulfate heptahydrate (Epsom salt) CuSO 4 5H 2 O copper(II) sulfate pentahydrate the water of hydration use hydrate with a Greek prefix for the number heat can remove some, or all, of this water Compound of the Week: Cobalt(II) Chloride, CoCl 2 CoCl CoCl 2 + + 6 H 6 H 2 O CoCl CoCl 2 6H 6H 2 O Cobalt(II) chloride, CoCl 2 , readily picks up water of hydration blue blue pink pink Intermediate stages are Intermediate stages are purple. purple....
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