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1、KeyHomeworkChapter8:BasicConceptsofChemicalBondingExercises:Sections8.5,8.6,8.7:DrawingLewisStructures:ResonanceStructures;ExceptionstotheOctetRule1.DrawLewisstructuresforthefollowing:1010a)methylamine,CH3NH2b)dimethylether,C2H6Oe)borontrifluoridef)chloritepolyatomicion10c)ethanol,
2、C2H6Od)xenontetrafluorideg)PCl310h)methane102.DrawLewisstructuresforthefollowingcompoundscontainingmultiplebonds:10a)carbondioxideb)carbonmonoxidec)diatomicnitrogend)ethyne,AKA:acetylene,C2H2e)HCNf)ethylene,C2H4g)CH2O3.DrawallpossibleLewisstructuresforthefollowing:10a)ozone,O3b)sul
3、furtrioxidec)nitratepolyatomiciond)benzene,C6H6e)carbonatepolyatomicionf)thiocyanatepolatomicion3.Continued10g)nitritepolyatomicion4.a)WhentalkingaboutatomsinaLewisstructure,whatismeantbythetermformalcharge?theformalchargeofanyatominamoleculeisthechargetheatomwouldhaveifalltheatoms
4、inthemoleculehadthesameelectronegativityb)Doestheformalchargeofanatomrepresenttheactualchargeonthatatom?Explain.NO:formalchargesarebookkeepingconventiontohelpchoosebetweenthemostlikelyLewisstructures.c)HowdoestheformalchargeofanatominaLewisstructuredifferfromtheoxidationnumberofthe
5、atom?Doeitheroftheserepresentthe"TRUE"situation?Explain.FormalCharge=oneextremeforpossibleelectrondistribution,assumestheelectronsaredistributedsuchthatthereisperfectcovalencyOxidation#=theotherextreme,assumemoreelectronegativeelementholdsalltheelectronsinabondTruth=somewhereinbetw
6、eenthesetwoextremes5.Drawallpossibleresonancestructuresforeachofthefollowinganduseformalchargetodeterminethemostlikelyresonance10structure.a)chloratepolatomicion'B'istheMOSTLIKELYresonancestructureb/ci)ithasthelowestpossiblechargeonallionsii)itputsthe(-)chargesonthemostelectronegat
7、iveatoms-oxygeniii)itputsthe(+)chargeonthelesselectronegativeatom-chlorineiv)thetotalchargessumtothechargeonthepolyatomicion=-1b)cyanatepolyatomicion'C'istheMOSTLIKELYresonancestructureb/ci)itassignsaformalchargeof"0"totwooftheatoms-CandNii)itputsthe(-)chargesonthemostelectronegati
8、veatoms-oxygeniii)thetotal
