StudentLecture_27

StudentLecture_27 - CHM 11500 T, Lecture 27, 1/3/2009...

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1 CHM 11500 T, Lecture 27, 1/3/2009 Reading: Interchapter: The Chemistry of Modern Materials Pages 656-669 Lab: Ch11, Gold Nanoparticles Final Exam: 8 am, Tuesday, December 15. Hall of Music
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2 Question #1 What is the radius of the Potassium ion in KCl? a = 628 pm r Cl - = 181 pm a. 628 pm b. 314 pm c. 266 pm d. 133 pm NaCl structure
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3 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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4 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 CaCO 3 and MgCO 3
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5 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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6 The Kyocera Ceramic Knife ultra light weight, with a RAZOR sharp edge. ceramic blades are made of zirconia, ZrO 2 , which is second only to diamonds in hardness. ceramic material is also extremely low-friction, which adds to the ease of cutting and chopping. Black knives are fired once more, causing the color change, and making them slightly harder Ceramics are hard and sharp but they fracture. Ceramic knives should not be used on bone-in meats, fruit with pits, frozen food, or other hard foods. Ceramic Knives
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7 Classes of Ceramics: Glasses Non-crystalline Formed by melting the raw materials and then cooling rapidly • Most common: silicate glasses, derived from SiO 2 Can modify properties by including impurities such
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StudentLecture_27 - CHM 11500 T, Lecture 27, 1/3/2009...

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