MCDB 1150 Lecture Notes - Lecture 7: Van Der Waals Force, Hydrogen Bond, Covalent Bond
17 Nov 2016
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Ionic bonds - electrostatic interaction between full charges. Van der waals - interaction between induced dipoles (transient dipoles) Hydrophobic/hydrophilic - disruption of hydrogen bonding of water by hydrophobic (nonpolar) molecules. Nonpolar molecules when mixed w polar molecules cannot participate in the bonding activity that the polar molecules are participating in. Bonding, water and carbon - the chemical basis of life. If you add a nonpolar substance to water the polar molecules will reorganize themselves around the nonpolar molecules. Tendency of nonpolar molecules to be excluded from polar environment (h2o) Hydrophobic molecules appear to aggregate in aqueous (water) solutions. Not a true bond call it an interaction . H2o molecules in h-bonded network-dynamic and relatively disordered. Nonpolar molecules disrupt network because can"t h-bond with h2o. H-bonds between h2o molecules must break and reform around the nonpolar substance = (cid:1542) order. Before adding the hydrophobic substance: h2o bonded network, (cid:1542) entropy.
