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Unformatted text preview: Chemistry Exam 3 Review 09:14 Ch. 8 Band Theory – description of chemical bonding in solids in terms of bands of orbitals. Used to explain the electrical properties of metals, insulators, and semiconductors. Valence band – A band of orbitals or energy states populated by the valence electrons in the ground state of a bulk solid Conduction band – A band of orbitals or energy states at higher energy than the valence band and typically unoccupied in the ground state of a solid Conductor – Semiconductor – Insulator – Band gap – difference in energy between the valence band and the conduction band in a solid Unit cell – the smallest collection of atoms or molecules that can be repeated in three dimensions to produce the overall structure of a solid Body centered – crystal lattice in which particles are arranged at the corners of a cube and also at the center of the cube Face centered – crystal lattice in which particles are arranged at the corners of a cube and also at the center of each face of the cube Simple cubic – crystal lattice in which particles are arranged at the corners of a cube Coordination # - The number of lattice points immediately adjacent to any given lattice point in the structure of a solid Packing efficiency – The percentage of the total volume that is actually occupied by the atoms in a given crystal lattice Doping – The controlled addition of a very small concentration of one element to an intrinsic semiconductor such as silicon or germanium N-doping – P-doping – P-N junction – point at which a piece of p-type material meets a piece of n-type material; an important building block for integrated circuits Alloy – Electron sea – Ch. 9 Calorimetry – Experimental technique for measuring the heat flow into or out of a thermodynamic system Heat (q) – the flow of thermal energy between two objects, from the warmer to the...
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This note was uploaded on 10/05/2011 for the course THAR 281 taught by Professor Staff during the Fall '07 term at Texas A&M.
- Fall '07