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CHM151Y1 (9)
Lecture

Physical Chem Lecture Jan 9

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Department
Chemistry
Course
CHM151Y1
Professor
Stephen Reid
Semester
Fall

Description
Jan92012PhysicalChemistryLectureChapter12AttractiveforcesinteractionsbetweenatomsduetochargesonatomsorduetotheelectronsthattheyshareWithinmoleculestherearebondingforceswhichinfluencethechemicalpropertiesInternalmolecularforcestendtobeweakerthoughnotalwaysTheyaretheforcesinbetweenmoleculesForinstancebetweenwatermoleculesTheyarenonbondingInhighschoolstudentsprobablylearnedaboutphasechangesButyoumaynotremembersublimationForinstancewatersublimingfromthesunonthesidewalkduringwinterEndothermicprocesstakesheattogofromlefthandsidetowardsrighthandsideEnergyisgivenoffFavouriteexampleFloridaorangetreesaresprayedwithwatertoprotectthefruitinsidewhenitgetscoldfreezingoutsideLiquidshaveverylowcompressibilityIfyoucontaminatepumpswithanoilwhichvaporizesbadlywithanotherthatvaporizeseasilycausesmanyproblemscreatinggaspocketsforexampleTheviscosityofgasismoresoforgasthanitisforliquidwewilllearnaboutthismorelaterHeatsofvaporizationareshownintheslideseegraphHeatsofvaporizationandfusionforseveralcommonsubstancesWaterisveryhighandArgonisverylowArgonatomsdontsticktogetherverystronglyMetalslikeMercuryhavesomanyelectronsthattheygiverisetostrongreactionstakesalotofheattovaporize9 Jan 2012 CHM151Y1Y The Molecular Science LEC 101
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