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chemnotesfall07 - *December 3 2007 Vapor Pressure pressure...

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****December 3, 2007**** Vapor Pressure- pressure exerted by a vapor at equilibrium with the liquid o As temp increases, vapor pressure increases (more molecules escaping into vapor phase!!) o As intermolecular forces increase, vapor pressure decreases (less molecules escaping into vapor phase!!) Boiling Point – temperature at which the vapor pressure = external pressure o Sea level - 1 atm BP- 100 deg. Celsius o Boulder BP - 94 deg. Celsius o Normal BP - the temp at which the vapor pressure = 1 atm. o Phase diagram for CO2 and H20 = Fig. 12.8 Intermolecular forces (pure substances) o 1- Dispersion forces (London forces) Weakest force IM force Occur in non-polar and polar molecules Most important in non-polar Induced/temporary dipole o 2- Dipole-dipole forces Intermediate forces Occurs in polar molecules Permanent dipoles o 3- Hydrogen “bonding” (still an intermolecular force, not comparable to the other hydrogen bond) Strongest IM force
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