中讲稿南京晓庄学院

ChemistryDepartmentNanjingXiaozhuangCollegeLongQi南京晓庄学院化学系龙琪Finishthechemicaleuqation,please

S+O2igniteSO2

?点燃SulphurDioxide

What’sSO2like?Let’sobserveabottleofSO2Let’ssharetheinformationandideas观察PhysicalpropertiesPhysicalProperties

State:Odour:Colour:Boilingpoint:Solubility:Density:gasirritantcolorless/pungent/suffocating/faintsweetish

/colorlessliquid(whenT<-100)-10oc,easytoliquefysolubleheavierthantheairAtroomtemperature

VSO2:VH2O=40:1/2.5timesasheavyasair状态气味沸点溶解度密度物理性质Whatchemicalpropertiesdoes

SO2have?Let’sguess!1、likeCO2,SO2isanacidicoxide,then?GuessfromthevalenceofS:+6+40SO2BeoxidedBereducedCl2,Br2,O2,KMnO4,HNO3H2SSO2+Br2+2H2O=+H2SO42HBr酸性氧氧化物物化合价价被氧化化被还原原Let’sobservesomeexperiments!二氧化化硫与与水的的反应应.zipExperiment11.Reactionwithwater---apropertyasanacidicoxideSO2+H2OH2SO3reversiblereactionChemicalProperties化学性性质可逆反反应Let’ssharetheinformationandideas！a)Collectwatersamplesfromaroundyourhomeandschool.Youmaycollectwaterfromalltypesofsources,likerain,lakes,snow,tapwater,etc.Makesureyoustoreyoursamplesincleanglassjars(wellrinsed,withoutanysoapresidue).b)Labeleachjarwith:thedatethesamplewascollectedthesource(suchas,river,rain,puddle,snow)whereandhowitwascollectedthetimeofdayitwascollectedc)CheckthepHlevelofeachwatersample.Besuretocheckyoursamplesasquicklyaspossibleafteryouhavecollectedthem.d)RecordthepHlevelsinachartthatlookssomethinglikethis:e)Mapyourresults:DrawamapofyourareaandrecordthepHlevelresultsonthemap.Besuretowritethedatesbesidethelevelssoyoucancompareyourresultslateron.f)Optionalnextstep:InthenextSeason,repeattheexperimentbycollectingwatersamplesfromroughlythesamelocationsandrecordingyourresultsonachartlikethefirstone.WhatchangesinthepHoccurred,ifany?

DateandtimecollectedSourceWherethesourceisfromHowitwascollected

pHlevel

2.Reactionwithoxygen---apropertyasareductant2SO2+O22SO3SO3+H2O=H2SO4TheabovereactionsareusedintheindustrialproductionofH2SO4Highpressure,temperatureCatalyst

Acolorlesssolid,m.p:16.80b.p:44.80还原原剂剂工业业生生产产催化化剂剂二氧氧化化硫硫的的漂漂白白性性.zipExperiment23.BleachingFunctiondecolorizethemagentasolution,formingcolorlessandunstablecompounds.Thebleachingfunctionistemporary.漂白白性性品红红溶溶液液使…褪色色化合合物物暂时时的的不稳稳定定的的NewstrawhatOldstrawhatThenewoneisbleachedbySO2,forminganunstablecolorlesscompound,sothenewoneisinlightcolor.Theunstablecolorlesscompounddecomposesandrestoretheorginalcolor，sotheoldoneisindarkcolor恢复原来来的颜色色浅色深色Let’’ssharetheinformationandideas！人民网ChemicalpropertiesUseyourhead!Stateotherbleachingagentsandcomparethem永久性漂漂白暂时性漂漂白Let’’ssummarizethechemicalpropertiesofSO2!小结1.ReactionwithwaterSO2+H2OH2SO3reversiblereaction2.Reactionwithoxygen2SO2+O22SO33.BleachingFunctionHighpressure,temperatureCatalyst

GroupActivitiesWhatchemicalscouldyouusetodistinguishSO2fromCO2?在实验室室用装置置④制备某气气体时会会发生副副反应，，生成二二氧化碳碳、二氧氧化硫、、水蒸气气，请用用下列装装置设计计一个实实验，以以验证上上述混合合气体中中是否含含有二氧氧化碳、、二氧化化硫和水水蒸气．．（1）装置③中加的固固体药品品是_____，以验证证混合气气体中含含有的____．装装置②中盛有的的溶液是是____，以以验证证混合气气体含有有____．三种气气体的验验证顺序序为____，____，____。（2）连接上上述装置置以验证证混合气气体中含含有CO2、SO2和水蒸气气的顺序序是（填各仪仪器接口口的代码码字母））：（））接（（）（（）接接（））（））接（））（））．（3）实验时时装置①中Q瓶内的现现象是______，结论是是______．P瓶中的现现象______，P瓶溶液的的作用______．若K瓶中的品品红溶液液不褪色色，可得得到的结结论是______．无水CuSO4水蒸气澄清石灰灰水二氧化碳碳水蒸气二氧化硫硫二氧化碳碳GEFFEDCBA颜色褪去去混合气中中含有二二氧化硫硫溴水褪色色吸收二氧氧化硫二氧化硫硫已经除除尽IsSO2usefultousornot?UsesofSO2Bleachpaperpulp,wool,silk,andstrawproductsKillthemoldandbacteria纸浆草制品品霉菌细菌But!ThepollutedcitiesTheformationofinternationalacidrain酸雨雨形成成Thestatueerodedbyacidrain雕像被腐蚀蚀的Thetreesarebeingdestroyedbyacidrain被破坏坏的Let’ssharetheinformationandideas！Theharmfuleffectsonpeople’shealth影响Theskyshouldhavebeenblue!Whatshallwedo?CHINA,1998Mainresources:factoriesResourcesofSO2来源DoyouwanttoknowhowmuchSO2isintheairaroundyou?UseyourheadDesignanexperimenttomeasuretheconcentrationofSO2intheairaroundyou..设计测量浓度Comparewiththefollowingtable,doestheconcentrationofSO2intheairaroundyouexcess（））