中講稿南京曉莊學(xué)院

ChemistryDepartmentNanjingXiaozhuangCollegeLongQi南京曉莊學(xué)院化學(xué)系龍琪Finishthechemicaleuqation,please

S+O2igniteSO2

?點(diǎn)燃SulphurDioxide

What’sSO2like?Let’sobserveabottleofSO2Let’ssharetheinformationandideas觀察PhysicalpropertiesPhysicalProperties

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

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

VSO2:VH2O=40:1/2.5timesasheavyasair狀態(tài)氣味沸點(diǎn)溶解度密度物理性質(zhì)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價(jià)價(jià)被氧化化被還原原Let’sobservesomeexperiments!二氧化化硫與與水的的反應(yīng)應(yīng).zipExperiment11.Reactionwithwater---apropertyasanacidicoxideSO2+H2OH2SO3reversiblereactionChemicalProperties化學(xué)性性質(zhì)可逆反反應(yīng)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還原原劑劑工業(yè)業(yè)生生產(chǎn)產(chǎn)催化化劑劑二氧氧化化硫硫的的漂漂白白性性.zipExperiment23.BleachingFunctiondecolorizethemagentasolution,formingcolorlessandunstablecompounds.Thebleachingfunctionistemporary.漂白白性性品紅紅溶溶液液使…褪色色化合合物物暫時(shí)時(shí)的的不穩(wěn)穩(wěn)定定的的NewstrawhatOldstrawhatThenewoneisbleachedbySO2,forminganunstablecolorlesscompound,sothenewoneisinlightcolor.Theunstablecolorlesscompounddecomposesandrestoretheorginalcolor，sotheoldoneisindarkcolor恢復(fù)原來(lái)來(lái)的顏色色淺色深色Let’’ssharetheinformationandideas！人民網(wǎng)ChemicalpropertiesUseyourhead!Stateotherbleachingagentsandcomparethem永久性漂漂白暫時(shí)性漂漂白Let’’ssummarizethechemicalpropertiesofSO2!小結(jié)1.ReactionwithwaterSO2+H2OH2SO3reversiblereaction2.Reactionwithoxygen2SO2+O22SO33.BleachingFunctionHighpressure,temperatureCatalyst

GroupActivitiesWhatchemicalscouldyouusetodistinguishSO2fromCO2?在實(shí)驗(yàn)室室用裝置置④制備某氣氣體時(shí)會(huì)會(huì)發(fā)生副副反應(yīng)，，生成二二氧化碳碳、二氧氧化硫、、水蒸氣氣，請(qǐng)用用下列裝裝置設(shè)計(jì)計(jì)一個(gè)實(shí)實(shí)驗(yàn)，以以驗(yàn)證上上述混合合氣體中中是否含含有二氧氧化碳、、二氧化化硫和水水蒸氣．．（1）裝置③中加的固固體藥品品是_____，以驗(yàn)證證混合氣氣體中含含有的____．裝裝置②中盛有的的溶液是是____，以以驗(yàn)證證混合氣氣體含有有____．三種氣氣體的驗(yàn)驗(yàn)證順序序?yàn)開(kāi)___，____，____。（2）連接上上述裝置置以驗(yàn)證證混合氣氣體中含含有CO2、SO2和水蒸氣氣的順序序是（填各儀儀器接口口的代碼碼字母））：（））接（（）（（）接接（））（））接（））（））．（3）實(shí)驗(yàn)時(shí)時(shí)裝置①中Q瓶?jī)?nèi)的現(xiàn)現(xiàn)象是______，結(jié)論是是______．P瓶中的現(xiàn)現(xiàn)象______，P瓶溶液的的作用______．若K瓶中的品品紅溶液液不褪色色，可得得到的結(jié)結(jié)論是______．無(wú)水CuSO4水蒸氣澄清石灰灰水二氧化碳碳水蒸氣二氧化硫硫二氧化碳碳GEFFEDCBA顏色褪去去混合氣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經(jīng)除除盡IsSO2usefultousornot?UsesofSO2Bleachpaperpulp,wool,silk,andstrawproductsKillthemoldandbacteria紙漿草制品品霉菌細(xì)菌But!ThepollutedcitiesTheformationofinternationalacidrain酸雨雨形成成Thestatueerodedbyacidrain雕像被腐蝕蝕的Thetreesarebeingdestroyedbyacidrain被破壞壞的Let’ssharetheinformationandideas！Theharmfuleffectsonpeople’shealth影響Theskyshouldhavebeenblue!Whatshallwedo?CHINA,1998Mainresources:factoriesResourcesofSO2來(lái)源DoyouwanttoknowhowmuchSO2isintheairaroundyou?UseyourheadDesignanexperimenttomeasuretheconcentrationofSO2intheairaroundyou..設(shè)計(jì)測(cè)量濃度Comparewiththefollowingtable,doestheconcentrationofSO2intheairaroundyouexcess（））