student notes lec 26 F08

student notes lec 26 F08 - CHM 11500 Lecture 26 Reading for...

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Click to edit Master subtitle style CHM 11500 Lecture 26
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Reading for this week, Interchapter: The Chemistry of Modern Materials Pages 643-655
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Summary from Last Time Crystalline versus amorphous structures Crystalline types: atomic, molecular, ionic, metallic, network covalent Three types of cubic crystal lattices Simple cubic: __ atom/unit cell Body-centered cubic: __ atoms/unit cell Face-centered cubic: ___ atoms/unit cell
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Microscopic vs. Macroscopic Having looked at the types of crystalline bonds and their molecular-level order, we now will look at the macro-level properties and characteristics of some crystalline materials: Ceramics Metals Semiconductors
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Ceramics Solid inorganic compounds that combine metal and non-metal atoms and in which bonding ranges from ionic to covalent. Examples: Clays Glasses Bricks Cement Tile Sea shells Sea urchin spines made of CaCO3 and MgCO3
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Properties of Ceramics Generally they are: Hard Brittle Inflexible Thermal insulators Most are electrical insulators (some conduct electricity) Some are opaque, some are transparent
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Non-crystalline Formed by melting the raw materials and then cooling rapidly Most common: silicate glasses, derived from SiO2 Can modify properties by including impurities such as other oxides (Na2O, CaO, Al2O3, etc.) Pyrex glass (used for beakers and other chemistry glassware and for kitchen ovenware) is a borosilicate glass because it incorporates boric oxides. Pyrex glass thus withstands temperature changes much
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student notes lec 26 F08 - CHM 11500 Lecture 26 Reading for...

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