CHE-1102 Lecture Notes - Lecture 2: Intermolecular Force, Surface Tension, Hydrogen Bond
Document Summary
Chapter 11 - intermolecular attractions and the properties of liquids and solids. A lot of intermolecular attractions in a solid, which keeps them together. More space between particles in a liquid. No intermolecular force in a gas because there is so much space between particles. The further away particles are, the less the force. The attractions between molecules are not nearly as strong as the intramolecular attractions (bonds) that hold compounds together. The very short lived attractive forces caused by the instantaneous displacement of electrons. Instantaneous dipole: distorted electrons give rise to a temporary dipole. Provides some additional intermolecular ordering on the molecular level. Increase in mw increase in london dispersion forces. Electronegativity increases to the right of the periodic table; decreases to the bottom of the table. Higher boiling point more ordered / greater intermolecular force. Occurs between polar molecules that contain a hydrogen atom that is attached to a f, o, or n.
