CHM 2046- Final Exam Guide - Comprehensive Notes for the exam ( 37 pages long!)
Document Summary
Increase in ke = increase in the motion of particles: more motion, more freedom, average kinetic energy is directly proportional to the temperature, keavg = 1. 5 kt. Intermolecular attractions are due to attractive forces between opposite charges: + ion to ion, + end of polar molecule to end, all molecules have at the very least, a temporary charge. Intramolecular forces > intermolecular forces: large charge = stronger attraction, longer distance = weaker attraction, as stated (cid:271)(cid:455) coulo(cid:373)(cid:271)(cid:859)s la(cid:449) In a mixture, ions from an ionic compound are attracted to the dipole of polar molecule: the strength of this attraction is one of the main factors that determines solubility of ionic compounds in water. Summary: dispersion forces are the weakest, then dipole-dipole, then hydrogen bonds, dispersion forces are present in all molecules/atoms, magnitude of dispersion forces increases with molar mass. If a molecule is polar, it has dipole-dipole attraction.
