# H1 F10 - compare these values with the measured densities...

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ENMA 300 Homework 1 Due: Sept. 14, 2010 1. Predict the type of bonding that holds the atoms/molecules together in the following solid materials. Explain why you have made the prediction for each material. Where appropriate include calculations. CaO CdS FeO Bronze (a copper rich copper-tin alloy) Solid neon Polyisoprene (a type of rubber) AlP 2a) Make a table with the melting point, elastic modulus, CTE, and density for Sn, Au and W. Reference your source(s) for the information. Briefly discuss how these properties relate to bonding. b) On the same nested schematic diagram sketch potential well diagrams for Sn, Au and W. Give a brief explanation for the relative location and shape of each curve. c) Briefly indicate how this schematic diagram could help you select a material for a specific application. 3. Callister 3.2. Show that the atomic packing factor for BCC is 0.68. 4. Callister 3.6 Using atomic weight, crystal structure, and atomic radius data tabulated inside the front cover, compute the theoretical densities of aluminum, nickel, magnesium, and tungsten, and then
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Unformatted text preview: compare these values with the measured densities listed in this same table. The c/a ratio for magnesium is 1.624. Study questions: Note: These are additional questions to help guide you as you read and study. They will not be collected or graded and solutions will not be provided. You can ask that we work out a solution to a specific problem during office hours or for class. Chapter 1: Callister 1.1 Note: If you do this problem you should consider that many of the devices combine multiple materials to provide the properties/functionality of the device. Thus, you should consider more than one material and its properties. How would this problem help you with respect to materials selection in a future job? Chapter 2: Briefly compare and contrast ionic, covalent and metallic bonding. Come back to this question later in the semester as you learn how bonding affects different kinds of behavior and think about how your answer would change. Callister: 2.4, 2.11-2.15...
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## This note was uploaded on 08/02/2011 for the course ENMA 300 taught by Professor Alsheikhly during the Spring '11 term at University of Maryland Baltimore.

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