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Cell Biology
Bryan Hogeveen

1 2 Most students will have their final lab exam next Molecular solids week. Practice and be ready for it! Strong intramolecular forces (strong bonds within the Cornered By Mike Baldwin molecule) But relatively weak intermolecular forces (much weaker than the molecule's bonds) FDL , CO , I , Br 4 2 2 2 low–moderate m.p. (size and # electrdependent) solubiepolarlvents dipole – dipole low – moderate m.p. HCl, CHCl 3 solubielarlvents Read sections 12.1, 12.2 H – bonding low – moderate m.p. EtOH, H O 2 Practice PS #6 solutions, lab manual practice exam. solubielarlvents 3 4 Atomic solids Diamond vs. graphite both are allotropes of carbon Different subtypes: Network (diamond) The covalent bonds extend throughout the solid  Metallic  Network Examples: C (diamond), silicon carbide (replace half C  Group 18 by Si) Wide range of m.p. See figure from Table 12.6  W ~ 3400C  Hg is a liquid at room temperature  group 18 very low m.p. Wide range of hardness  Fei,hard  Cu, Ag, Au soft Insulators/conductors Remember: low m.p. doesn’t mean a weak covalent bond. It’s the intermolecular forces that are broken 5 6 Each C atom is bonded to 4 other C atoms and the Network (graphite) network is extended throughout the solid in all  Sheets / layers (see figure next slide) resulting in directions. a structure with a direction to it  high m.p.  Within a layer strong covalent bonds (each C is  very hard
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