CHM 143 Lecture Notes - Lecture 24: Capillary Action, Evaporation, Lone Pair
26 Dec 2016
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Document Summary
Free rotation- single bonds sigma bonds which are end to end orbital overlap. The atoms connected can move around or spin on the axis. Pi bonds prevent free rotation atoms are locked in a fixed location. Distinguished by 4 physical properties: volume and shape, density, compressibility, thermal expansion. Phase change- transition from one state of matter to another. This occurs when the vapor pressure equals atmospheric pressure. Melting point the temp at which the s to l. Freezing point the temp at which the l to s. Boiling point the temp at which the l to g. Normal bp the temp the substance boils at 1 atm. No gases because molecules do not touch: dipole dipole, dispersion forces, hydrogen bond, ion dipole. Dipole dipole- interaction between 2 polar molecules + region of one molecule is attracted to - region of 2 molecule. Takes more energy (increase temp) to interrupt the attraction between 2 molecules.
