CHEM 001 Lecture Notes - Lecture 23: Electronegativity, Vaporization, Gecko

• School: College of The Sequoias
• Department: Chemistry (CHEM)
• Course: CHEM 001
• Professor: guerra

Document Summary

Intermolecular forces are weak since they involve partial charges on molecules (1 > q > - There are also large distances (radius) between molecules. Dipole-dipole forces - when polar molecules approach each other, their partial charges act as small electric fields. One molecule"s positive pole attracts the negative pole of another. A strong type of dipole-dipole force that occurs in molecules with h-x bonds (x = fon) N, o, and f only h-bond because they are. Very electronegative - strong partial charges on h and x. Usually boiling point increase as molar mass increases. H2o, hf, and nh3 have higher boiling points since they hydrogen-bond. Present in all atoms, molecules, and ions. Responsible for liquid and solid phases of nonpolar molecules. A temporary charge build-up at one side induces a dipole in its neighbor. Geckos adhere to surfaces via dispersion forces only. Can"t adhere to teflon (due to fluorine atoms on surface)