25_Solids_CHMSpirng09

25_Solids_CHMSpirng09 - CHM 115 Lecture 25/26 Solids...

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1 CHM 115 Lecture 25/26 Solids Reading: Sections 13.6-13.8, pp 616-629
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2 Crystalline solids When most liquids are cooled, they eventually freeze and form crystalline solids , solids in which the atoms, ions, or molecules are arranged in a definite repeating pattern .
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3 Crystalline solids Some solids (such as diamonds and the individual grains in sugar and table salt) are single crystal. Most common crystalline solids are aggregates of many small crystals. Common examples of the latter are sandstone, chunks of ice, granite, and metal objects. QuickTimeᆰ and a TIFF (Uncompressed) decom are needed to see this pict QuickTimeᆰ and a TIFF (Uncompressed) de are needed to see this p Granite tile for countertops.
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4 Amorphous solids Tar, molten glass, molten plastics, and molten butter, consist of large molecules or a mixture of molecules that cannot move readily. As the temperature is lowered, their molecules move more and more slowly and finally stop in random positions. The resulting materials are called amorphous solids or glasses. Such solids lack an ordered internal structure . Common examples include candle wax, butter, glass, and plastics.
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5 Question 1 Which type of crystalline solid is CaF 2 ? A. Atomic solid B. Molecular solid C. Ionic solid D. Metallic solid E. Network covalent solid
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6 Question 2 Which type of crystalline solid is solid nitrogen ? A. Atomic solid B. Molecular solid C. Ionic solid D. Metallic solid E. Network covalent solid
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7 Major Types of Crystalline Solids - Reading Interparticle Forces Physical Behavior Atomic (Noble gases) Molecular Ionic Metallic Network Soft, very low mp, poor thermal & electrical conductors Dispersion Dispersion, dipole-dipole, H bonds
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25_Solids_CHMSpirng09 - CHM 115 Lecture 25/26 Solids...

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