MSE 150 Exam 1 Review

MSE 150 Exam 1 Review - MSE 150 Exam 1 Review Short Answers...

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MSE 150 Exam 1 Review Short Answers Lecture 1 Non-metals Non-metals have 4 or more valence electrons (mostly) Anions High electronegativity Metals 3 or less valence electrons Cations (+) Low electronegativity Ceramics Brittle Insulators Polymers Plasticity Insulators Limited Temp Range C-It Lowest density Lecture 2 ---Questions on writing outer shell configurations Lecture 3 Primary Bonds: Ionic Electrostatic Attraction Non-directional High coordination number Covalent Bond Shared electrons Complete outer shell Bond angles Low CN Metallic Bond Delocalized electrons Non-directional High CN Lecture 4 Ceramic Materials Compounds Metal – cations Nonmetal – anions %Ionic = (1-e -1/4(Xa-Xb)^2 )*100 -- Ionic/Covalent
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Charge Neutrality Relatice Sizes of Anions and Cations r/R Metals BCC CN = 8 FCC and HCP CN = 12 Substitutional Solid solutions 1. Size difference 2. same crystal structure a. Valence and electronegativity Polymers C-C covalent C-H 96% Thermoplastics soften on heating. Chains of C-C with secondary bonds between the chains which allow the softening.
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MSE 150 Exam 1 Review - MSE 150 Exam 1 Review Short Answers...

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