Card Set Information

2012-09-20 22:43:17

LO Part 2
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  1. Polarity
    Having an uneven distribution of charge
  2. Hydrogen Bond
    A partly electrostatic, partly covalent interaction between a donor group such as O--H or N--H and an electronegative acceptor atom such as O or N.
  3. Electrostatic interaction
    Occur between particles that are polar but not actually charges
  4. Van der Waal's radius
    The distance from an atom's nucleus to its effective electronic surface.
  5. Van der Waal's interaction
    A weak noncovalent association between molecules that arises from the attractive forces between polar groups (dipole-dipole interaction) or between nonpolar groups whose fluctuating electron distribution gives rise to temporary dipoles (London dispersion forces).
  6. Electronegativity
    A measure of an atom's affinity for electrons.
  7. Dipole-dipole interaction
    A type of van der Waals interaction between two strongly polar groups.
  8. London dispersion forces
    The weak van der Waals interactions between nonpolar groups as a result of fluctuations in their electron distributions that create a temporary separation of charge (polarity).
  9. Hydrophilic
    Having high enough polarity to readily interact with water molecules.  Hydrophilic substances tend to dissolve in water.
  10. Hydrophobic
    Having insufficient polarity to readily interact with water molecules.  Hydrophobic substances tend to be insoluble in water.
  11. Hydrophobic effect
    The tendency of water to minimize its contacts with nonpolar substances, thereby inducing the substances to aggregrate
  12. Amphiphilic
    (Amphipathic) Having both polar and non-polar regions and therefore being both hydrophilic and hydrophobic.
  13. Amphipathic
    Having both polar and non-polar regions and therefore being both hydrophilic and hydrophobic (amphiphilic)
  14. Micelle
    A globular aggregate of amphiphilic molecules in aqueous solution that are oriented such that polar segments form the surface of the aggregate and the non-polar segments form a core that is out of contact with the solvent.