双语Carbon dioxide

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1、PropertiesofcarbondioxideOutline：1.Physicalpropertiesofcarbondioxide2.ChemicalpropertiesofcarbondioxideFrom:九年义务教育三年制初级中学教科书Chapter5Goodmorning,everyone!Welcometomyclass!Beforeclass,Iaskyousomequestion:Doyouhearofthegreenhouseeffect?Whatkindofgascausedbythegre

2、enhouseeffect?Whatknowstheanswer?Carbondioxide.Whatimportantpropertiesofcarbondioxide?Thisclass,Welearnthepropertiesofcarbondioxidetegether.1.PhysicalpropertiesofcarbondioxideFirstly,welearnaboutthephysicalpropertiesofcarbondioxide.Thisbottlefilledwithcarbondi

3、oxide.Lookcarefully.Whatstateisit?Itisgas.Whatcolorisit?Itiscolorless.Howaboutthedensityofcarbondioxide.Withthisquestion,letuslookatthemedia.Tietwosimilarsizesmallpaperbagstobothsidesofathinwoodrod.Tieathinropetothemiddleofthewoodrodtomaintainbalance,andtiethe

4、othersideoftheroptoanionsupportingstand.Pourcarbondioxidequicklyintooneofthesmallpaperbags.Whathappens.Thetwopaperbagsstillbalance?Thebagfilledwithcarbondioxideistilted.Itshowcarbondioxidehasahigherdensitythanair.Carbondioxidehasadensityof1.977g/L,about1.5time

5、sthanofair.CantheCarbondioxidedissolveinwater?Letusdoanexperiment.Thisbottlefilledwithcarbondioxide.Thisiswater.Now,Ipourthewaterintobottle,tighenthelidandshockit.Lookcarefully,whathappen?Thebottledefate.ItshowsthatCarbondioxidecandissoleinwater.2.Chemicalprop

6、ertiesofcarbondioxideNow,letusdoanexperiment.Putthecandleonthebottle,litit.Pourintocarbondioxide.Payattentiontowhathappenstotheburningcandle.Thecandlegoesout.Thisexperimentshowscarbondioxidedoesnotburn,norhelpburning.Finally,takeasummary.Bytheclass,weknowphysi

7、calproperties:carbondioxideisacolorlessgas,hasahigherdensitythanair,candissolveinwater;Chemicalproperties:doesnotburnanddoesn’thelpburning.Myclassisover.thanksyourlistening