In class notes for October 15, 2007

In class notes for October 15, 2007 - o Isopentane has a...

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General Chemistry Lecture 102a In class notes for October 15, 2007 Exam Thursday 7-9pm Last Lecture o Intermol attractions o Vapor pressure and phase transitions The stronger or weaker the intermolecular attraction, it will become a solid, liquid, gas accordingly Table of boiling points tells about the types of attractions we have The noble gas category only as dispersion forces Methane, ammonia, water and HF o Methane is non-polar, dispersion forces o The other three are polar – dipole-dipole and dispersion, also hydrogen bonding o Water is the best at hydrogen bonding Fluoride, cloride, bromide, iodide o Nonpolar and dispersion forces Methane, carbon tetrafluoride, carbon tetrachloride o The bigger the electron cloud the higher the boiling point will be Hr, HCl, HBr, and HI o Dipole-dipole and dispersion o Hf has hydrogen bonding Pentane, isopentane, neopentane, decane o Pentane is a five carbon chain
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Unformatted text preview: o Isopentane has a branch, neopentane has two branches, decane has ten carbons o See a o More surface area, higher boiling point Vapor pressure o See b o At equilibrium the vapor pressure reaches a maximum and stops o See c General Chemistry Lecture 102a In class notes for October 15, 2007 Clicker question s o Which flask will have the highest vapor pressure? 50 mL at 25 degrees c 50 mL at 45 de They will be the same o Which flask will have the highest vapor pressure? (assume same temp in both) 50mL with 1.0 atm 50mL with vacuum in flask initially Both the same pressure o one gas doesnt care what the other is doing o Which flask will have the highest vapor pressure (assume same temp in both) 100mL flask with 10mL of water 100mL flask with 50mL of water Both same pressure Demo...
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This note was uploaded on 02/22/2009 for the course CHEM 102a taught by Professor Hanusa during the Fall '06 term at Vanderbilt.

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In class notes for October 15, 2007 - o Isopentane has a...

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