CHEM 1210 Chapter 11: Liquids and Intermolecular Forces

• School: Ohio State University
• Department: Chemistry
• Course: CHEM 1210
• Professor: Kroner Steven

Document Summary

11-1| a molecular comparison of gases, liquids, and solids. Gas: assumes shape and volume of container, expands to fill container, is compressible, flows easily, diffusion within a gas occurs rapidly. Liquid: assumes shape but not volume of container, doesn"t expand to fill container, isn"t compressible, flows easily, diffusion within a liquid occurs slowly. Solid: retains shape and volume, doesn"t expand to fill container, isn"t compressible, doesn"t flow, diffusion within a solid occurs extremely slowly. Intermolecular forces are generally much weaker than intramolecular forces (bonds) Many properties reflect intermolecular forces, such as boiling and melting points. As intermolecular forces increase, so do boiling and melting points. Three types of forces called van der waals forces: dispersion forces, dipole-dipole attractions, and hydrogen bonding. All three are electrostatic, involve + - attractions. Dispersion force: instantaneous distribution of electrons in nonpolar atoms can still have an instantaneous dipole moment. Motion of electrons in one atom influence motion of the neighbor atom"s electrons.