2046chapter12 - compounds Classifications of Solids...

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1 Ch 12: Solids and Modern Materials Learning goals and key skills: h Classify solids base on bonding/intermolecular forces and understand how difference in bonding relates to physical properties h Know the difference between crystalline and amorphous solids. Understand the relationships between lattice vectors and unit cell. h Understand why there are a limited number of lattices. Be able to recognize the four 2d and several 3d primitive lattices. Know the locations of lattice points for body- and face-centered lattices h Calculate the empirical formula and density of ionic and metallic solids from a picture of the unit cell. Be able to estimate the length of a cubic unit cell from the radii of the atoms/ions present h Explain how homogeneous and heterogeneous alloys differ. Describe the differences between substitutional alloys, interstitial alloys, and intermetallic
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Unformatted text preview: compounds. Classifications of Solids Crystalline Solids – have atoms arranged in an orderly repeating pattern Amorphous Solids – lack the order found in crystalline solids 2 Unit cell – relatively small repeating unit that is made up of a unique arrangement of atoms and embodies the structure of the solid. Crystal lattice – geometrical pattern of points on which the unit cells are arranged Lattice points – each lattice point has an identical environment. The positions of the lattice points are defined by the lattice vectors . 3 4 X-ray diffraction 5 6 Alloys Alloy – a material that contains more than one element and has the characteristic properties of a metal. 7...
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2046chapter12 - compounds Classifications of Solids...

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