二氧化硫的双语教学(省常中-房寿高).ppt

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1、Sulfurdioxide江苏省常州高级中学房寿高一、Preparationofsulfurdioxide二、PhysicalpropertiesofSO2Undernormalcircumstances，sulfurdioxideisakindofcolorlessgaswithaverypungent([‘pʌndʒənt]刺激性)odour.Itsdensityismorethanair.Fromthepreparation,whatphysicalpropertiescanyouget?Easilysolubleinwater(1:40).E

2、asilyliquefied,poisonousgasunderpressure.Isitsolubleinwater?三、chemicalpropertiesofSO2let’sguess1.LikeCO2,SO2isanacidicoxide二氧化硅与二氧化碳的比较CO2SO2WithbasicoxideWithbasewithwaterWithsaltCaO＋SO2CaSO3高温CO2＋2NaOH＝Na2CO3+H2OSO2＋2NaOH＝Na2SO3+H2OCO2＋Na2CO3+H2O＝2NaHCO3Someotherimportantchem

3、icalequations.SO2+NaOH=NaHSO3（excess）LikeCO2,IfyouPassSO2throughlimewater[Ca(OH)2],thelimewaterturnscloudy.ContinuingpassingSO2willeliminatethecloudycondition.SO2+H2O+CaSO3=Ca(HSO3)2CalciumbisulfiteEnlargeyouviewstalagmite['stæləɡmait,stə'læɡmait]石笋；石笋状stalactite['stæləktait,st

4、ə'læktait]钟乳石SO2+Na2CO3=（insufficient）SO2+2NaHCO3=Na2SO3+2CO2+H2O（insufficient）Na2SO3+CO2SO2+Na2CO3(excess）—NaHSO3+CO2+H2O22SO2+NaHCO3=NaHSO3+CO2（excess）—Exercises：ToremovetheimpuritygasofSO2inCO2,whichreagentshouldwechoose()A.SaturatedNa2SO4（aq)B.SaturatedNaHCO3(aq)C.Saturated

5、NaOH(aq)D.SaturatedNa2CO3(aq)BSO2SH2SO40+4+6氧化性加还原剂还原性加氧化剂Prediction：Bothasoxidizingagentandreducingagent。Guessfromthevalenceofsulfur2、reducibilitySO2CanreactwithO2、X2solution（Cl2、Br2、I2）、H2O2、HNO3、KMnO4(H+)、Fe3+etc.2)SO2+Cl2+H2O=(Br2、I2similarly）2SO2+O22SO31)△HCl+H2SO422Questi

6、on：PutsomeSO2(g)intoBaCl2(aq),isthereanywhiteprecipitation[pri,sipi‘teiʃən](沉淀）?ThenaddsomedropsofH2O2,whatwillhappen？3）SO2+H2O2=H2SO4NOYes.Becauseinacidicsolution,NO3—hasstrongoxidability，itcanoxidize['ɔksidaiz]SO2intoSO42-.Discussion：PutsomeSO2(g)intoBa(NO3)2(aq),isthereanywh

7、iteprecipitation?4）SO2CanmakeKMnO4(H+)、Fe3+fade（MnO4-intoMn2+).5SO2+2MnO4-+2H2O=2Mn2++5SO42-+4H+SO2+2Fe3++2H2O=SO42-+2Fe2++4H+3、OxidabilityPutsomeSO2(g)intoH2S(aq),whatphenomenoncanyousee?SO2+2H2S=3S↓+2H2O（comproportionation归中反应）experimentsDisproportionation歧化反应4、Bleachingagent

8、demonstrativeexperimentBleachingprinciple：Temporarilyc