CHEM101 Lecture 41: April 10_ From Last Lecture_ The density of Al, Conductors, Semiconductors, and Insulators, Semiconductors & Example Si Semiconductor

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10 Apr 2019
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April 10: from last lecture: the density of al, conductors, semiconductors, and. Al volume of the cell = 6. 631 x 10^-26 m^3. Molar mass of al = 4 atoms in a cell = 26. 98 g/mol x 4 = 107. 98 g/mol x cell. Mass of a single cell = (107. 98 g/mol x cell) / (6. 02 x 10^23 cells in a mol) Density = (1. 792 x 10^-22 g/cell) / (6. 631 x 10^-29 m^3/cell) = 2. 703 x 10^6 gm or 2. 703 g cm^3. Conductors: this is a material that conducts electricity, another way to say that would be that it allows the movement of electrons or the flow of electrons. There is no gap/energy difference between the valence band and the conduction band. The band is a large collection of orbitals, of any kind. Semiconductors: materials that show higher conduction for electrons when an external force (energy) is applied to the system.

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