42中讲稿ppt-南京晓庄学院

ChemistryDepartmentNanjingXiaozhuangCollegeLongQi南京晓庄学院化学系龙琪Finishthechemicaleuqation,pleaseS+O2igniteSO2?点燃SulphurDioxideWhat’sSO2like?Let’sobserveabottleofSO2Let’ssharetheinformationandideas观察PhysicalpropertiesPhysicalProperties•State:•Odour:•Colour:•Boilingpoint:•Solubility:•Density:gasirritantcolorless/pungent/suffocating/faintsweetish/colorlessliquid(whenT-100)-10oc,easytoliquefysolubleheavierthantheairAtroomtemperatureVSO2:VH2O=40:1/2.5timesasheavyasair状态气味沸点溶解度密度物理性质WhatchemicalpropertiesdoesSO2have?Let’sguess!1、likeCO2,SO2isanacidicoxide,then?2.GuessfromthevalenceofS:+6+40SO2BeoxidedBereducedCl2,Br2,O2,KMnO4,HNO3H2SSO2+Br2+2H2O=+H2SO42HBr酸性氧化物化合价被氧化被还原Let’sobservesomeexperiments!二氧化硫与水的反应.zipExperiment11.Reactionwithwater---apropertyasanacidicoxideSO2+H2OH2SO3reversiblereactionChemicalProperties化学性质可逆反应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?DateandtimecollectedSourceWherethesourceisfromHowitwascollectedpHlevel2.Reactionwithoxygen---apropertyasareductant2SO2+O22SO3SO3+H2O=H2SO4TheabovereactionsareusedintheindustrialproductionofH2SO4Highpressure,temperatureCatalystAcolorlesssolid,m.p:16.80b.p:44.80还原剂工业生产催化剂二氧化硫的漂白性.zipExperiment23.BleachingFunctiondecolorizethemagentasolution,formingcolorlessandunstablecompounds.Thebleachingfunctionistemporary.漂白性品红溶液使…褪色化合物暂时的不稳定的NewstrawhatOldstrawhatThenewoneisbleachedbySO2,forminganunstablecolorlesscompound,sothenewoneisinlightcolor.Theunstablecolorlesscompounddecomposesandrestoretheorginalcolor，sotheoldoneisindarkcolor恢复原来的颜色浅色深色Let’ssharetheinformationandideas！人民网ChemicalpropertiesUseyourhead!Stateotherbleachingagentsandcomparethem永久性漂白暂时性漂白Let’ssummarizethechemicalpropertiesofSO2!小结1.ReactionwithwaterSO2+H2OH2SO3reversiblereaction2.Reactionwithoxygen2SO2+O22SO33.BleachingFunctionHighpressure,temperatureCatalystGroupActivities•WhatchemicalscouldyouusetodistinguishSO2fromCO2?•在实验室用装置④制备某气体时会发生副反应，生成二氧化碳、二氧化硫、水蒸气，请用下列装置设计一个实验，以验证上述混合气体中是否含有二氧化碳、二氧化硫和水蒸气．（1）装置③中加的固体药品是_____，以验证混合气体中含有的____．装置②中盛有的溶液是____，以验证混合气体含有____．三种气体的验证顺序为____，____，____。（2）连接上述装置以验证混合气体中含有CO2、SO2和水蒸气的顺序是（填各仪器接口的代码字母）：（）接（）（）接（）（）接（）（）．（3）实验时装置①中Q瓶内的现象是______，结论是______．P瓶中的现象______，P瓶溶液的作用______．若K瓶中的品红溶液不褪色，可得到的结论是______．无水CuSO4水蒸气澄清石灰水二氧化碳水蒸气二氧化硫二氧化碳GEFFEDCBA颜色褪去混合气中含有二氧化硫溴水褪色吸收二氧化硫二氧化硫已经除尽IsSO2usefultousornot?UsesofSO2•Bleachpaperpulp,wool,silk,andstrawproducts•Killthemoldandbacteria纸浆草制品霉菌细菌But!ThepollutedcitiesTheformationofinternationalacidrain酸雨形成Thestatueerodedbyacidrain雕像被腐蚀的Thetreesarebeingdestroyedbyacidrain被破坏的Let’ssharetheinformationandideas！Theharmfuleffectsonpeople’shealth影响Theskyshouldhavebeenblue!Whatshallwedo?CHINA,1998Mainresources:factoriesResourcesofSO2来源DoyouwanttoknowhowmuchSO2isintheairaroundyou?UseyourheadDesignanexperimenttomeasuretheconcentrationofSO2intheairaroundyou..设计测量浓度Comparewiththefollowingtable,doestheconcentrationofSO2intheairaroundyouexcess（）thelimitation?Ifitis,whatcanyoudo?time10standard20standard30standardPeryearday0.020.060.10Perday0.050.150.25once0.150.500.70LimitationofSO2intheair/mg·m3比较超过限度Thanksforyourcoming!Email:[e-mail]