CHEM 130 Chapter Notes - Chapter 9: Phase Diagram, Intermolecular Force, Noble Gas
Document Summary
Intermolecular forces are relatively weak interactions that occur between molecules. When a substance changes from a solid to a liquid, the molecules remain intact, the changes in states are due to forces among molecules, not within molecules. Molecules with polar bonds often behave in an electric field as if they had a center of positive charge and a center of negative charge dipole moment. London dispersion forces are forces that exist among noble gas atoms and nonpolar molecules, that involve an accidental dipole that induces a momentary dipole in a neighbor; weak. Vaporization/evaporation is the change in state that occurs when a liquid evaporates to form a gas (endothermic) Heat/enthalpy of vaporization is the energy required to vaporize one mole of liquid at 1 atm. Condensation is the process by which vapor molecules re-form a liquid; as the number of vapor molecules increases, so does the rate of return of these molecules to a liquid state.
