01:160:161 Lecture Notes - Lecture 20: Metal, Covalent Bond, Cubic Crystal System
Document Summary
Only combination of pressure and temperature where 3 phases exist in equilibrium. Reading at a pressure of 1 atm until you hit liquid gas equilibrium line. Point just before supercritical fluid phase: highest point where you have distinct boundary between liquid and gas (everything will start blending, no distinct point of telling if its liquid or solid. Microscopic small # of atoms, ions, or molecules making up a unit that is repeated over and over: unit cell. Description: a sphere (atom, ion, or molecule on each corner of unit cell) Coordination # - (how many neighboring atoms/ions/molecule one atom/ion/molecule has: = 6. Simple cubic number of spheres inside the unit cell 8 x 1/8 = 1. Edge of unit cell length l = 2r. Description: 1 sphere completely inside the cube (middle) and 1 sphere on each corner. Coordination # 8: # of spheres inside unit cell, 1 (middle) + (8 x 1/8)
