ch11_Part6 - Dimensionality of the network affects other...

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GENERAL CHEMISTRY CHAPTER 11 – INTERMOLECULAR FORCES, LIQUIDS, & SOLIDS PAGE 21 OF 22 metallic atomic solids = held together by metallic bonds Solids held together by metallic bonds Strength varies with sizes and charges of cations Melting point varies Mostly closest packed arrangements of the lattice points network covalent atomic solids Solids held together by covalent bonds Atoms attached to its nearest neighbors by covalent bonds Because of the directionality of the covalent bonds, these do not tend to form closest-packed arrangements in the crystal Because of the strength of the covalent bonds, these have very high melting points (> 1000°C)
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Unformatted text preview: Dimensionality of the network affects other physical properties Diamond Graphite High Melting ( ~3800C) High Melting ( ~3800C) Very Rigid Strong Covalent Bonds Slippery feel - Only dispersion forces holding the sheets together Very Hard - Strong Covalent Bonds Lubricants sheets can slide past each other -- Electrical Insulator Thermal Conductor Thermal Conductor Chemically Unreactive Chemically Unreactive GENERAL CHEMISTRY CHAPTER 11 INTERMOLECULAR FORCES, LIQUIDS, & SOLIDS PAGE 22 OF 22 Other carbon allotropes: Flow Chart to classify crystalline solids:...
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ch11_Part6 - Dimensionality of the network affects other...

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