CHM 2046 Study Guide - Quiz Guide: Covalent Bond, Electrical Conductor, Silicon Dioxide
Document Summary
3 categories: nonbonding, metallic, network content solids. Nonbonding atomic solids: noble gases in solid form, held by relatively weak dispersion forces (low melting point but increases with molar mass, closet-packed structures (either hex or cubic) that helps maximizes attractive force + minimizes energy. Metallic atomic solids: held by metallic bonds, coulombic attractions, melting points varies & varying bond strength, mostly closet-packed lattice points (cations, not directional. Network covalent atomic solids: examples: diamonds, graphite, silicon dioxide, held by covalent bonds, and attached to their nearest neighbors, directional, very high melting points, dimensionality of the network affects other physical properties. Very rigid due to directionality of covalent bonds & very hard. One giant molecule held by covalent bonds. Each sheet a giant molecule and sheets are stacked by dispersion forces. Carbon atoms in a sheet are covalently bonded together. Slippery feel (slide past each other, only dispersion forces holding together) Quartz is sio in pure form (melts at 1600c)
