CHEM 001B Lecture Notes - Lecture 9: Kinetic Theory Of Gases, Intermolecular Force, Boiling Point
9 Mar 2018
School
Department
Course
Professor
Document Summary
Forces: the combustion of attractive and repulsive electrical forces between pairs of electrons within a molecule are intramolecular forces, the forces that act between molecules and between molecules and ions are intermolecular forces. Interactions of nonpolar molecules: dispersion (london) forces: Dispersion: momentary shift in e- density = dispersion. Strength of dispersion forces: factors affection strength of dispersion, size of atoms/molecules, shape of molecules. Effect of shape on dispersion: the more spread out a molecule, the stronger the opportunity for dispersion forces and the higher the boiling point. Ion-dipole interaction: attractive force between an ion and a molecule that has a permeant dipole, sphere of hydration, cluster of water molecules surrounding an ion in aqueous solution, sphere of solvation if solvent is other than h2o. Dipole-dipole interactions: dipole-dipole interaction, attractive forces between polar molecules, hydrogen bond, strongest dipole-dipole interaction, occurs between h atom bonded to a small, highly electronegative element (f,o,n) and an atom of o or n in another molecule.
