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Chapter 13 - 5214638 Crystalline solids When a...

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5214638.doc Crystalline solids When a molecule/atom solidifies in a orderly fashion crystalline When a molecule solidifies in a non-orderly fashion, ie. no repeating units amorphous Crystalline solids The atoms, molecules or ions pack together in an ordered arrangement Such solids typically have flat surfaces, with unique angles between faces and unique 3-dimensional shape Examples of crystalline solids include diamonds, and quartz crystals Amorphous solids No ordered structure to the particles of the solid No well defined faces, angles or shapes Often are mixtures of molecules which do not stack together well, or large flexible molecules Examples would include glass and rubber Crystal lattices and unit cells Particles in crystals are arranged in patterns that repeat over and over again in all directions. overall pattern is know as crystal lattice simplest or basic unit is called a unit cell see figure 13.4 Unit Cells Chem 111 Lecture notes By Alan Zombeck page 1
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