CHEM 122 1st Edition Lecture 2 Outline of Last LectureI. Three Physical States of Mattera. Gasesb. Liquidsc. SolidsII. Intermolecular/Intramolecular Forcesa. Polarizability Outline of Current Lecture I. Dipole-Dipole Forcesa. Polar moleculesII. Hydrogen BondingCurrent LectureDipole-Dipole Forces: Attractions between the partial positive and negative sides of polar molecules.- All polar molecules have dipole-dipole attractionsPolar molecules/Permanent dipoles: molecules that are more electronegative have a greater tendency to attract bonding pairs of electrons toward itself.London dispersion forces is much greater than the dipole-dipole forces for polar molecules- Therefore molecules of similar size, those with greater dipole moments with have slightly greater intermolecular forces resulting in slightly higher boiling points.Hydrogen Bonding: bonds that form between a partial positive Hydrogen and a partially negative lone pairs.- Have unusually strong intermolecular forcesThese notes represent a detailed interpretation of the professor’s lecture. GradeBuddy is best Used as a supplement to your own notes, not as a substitute.- Only happens with N,O and F. Common features:o Second period elementso Very small atomso Very electronegativeo Have lone pairs of electrons for their hydrideso Formation of highly polar
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