双语课稿--氧气的化学性质

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1、Topic:ThechemicalpropertiesofoxygenOutline:1、Sulfurreactswithoxygen.2、Ironreactswithoxygen・3、ThechemicalpropertiesofoxygenGoodafternoon,everyonelWelcometomyclasslTodaywewilllearnaboutthechemicalpropertiesofoxygen.Weknowoxygenisoneoftheaircomposition.Wecannotlivewithouttheoxyge

2、n.Sotheoxygenisveryimportantinourlife.Nowletusknowmoreabouttheoxygenbywatchingthevideowiththequestionsthatwhyweshouldplaceasmallwaterinthebottomofthebottleandwhatdiffereneebetweentheburningsulfurinairandinoxygen.Pleasecomparethem・(Thevideo:weplaceasmallamountofsulfurontoaspoon

3、andheatthestrongly.Wecanseethatsulfurburnsinairwithablueflame.Thenweputtheburningsulfurintheoxygen,wecanfindthatsulfurburnsmorestronglyinoxygenwithapurplish-blueflame,whichmeanssulfurreactwithoxygen,thenproducessulfurdioxide.)Fromthevideo,wecanknowthatsulfurburnsinairwithablue

4、flamewhileitburnsmorestronglyinoxygenwithapurplish-blueflame.Sulfurhasachemicalreactionwithoxygentoformthepungentsmallinggascalledsulfurdioxideandheat.Thisreactioncanbewrittenlikethis:IgniteSulfur+Oxygen►SulfurdioxideNowweknowthephenomenonofsulfurburningintheairandintheoxygen.

5、Weallknowthatsulfurisanonmetalsubstancewhichisafaintyellowsolid.Butwhatwillhappenwhilethemetal(iron)reactswithoxygen?Letuswatchthevideowiththesequestionsthatwhatuseofplacingasmallwaterinthebottomofthebottleandwhatdiffereneewecanwatchbetweentheburningthinironinairandinoxygen.Pl

6、easecomparethembyyourself.(Thevideo:Windapieceofshinythinironwireintoahelixandtieittoanironwireinoneendandtoamatchattheother.Lightthematchandputitslowlyintoagas-collectingbottlefilledwithoxygen.Wecanseethatthethinironwireburnsstronglyinoxygentogivesparksandtoformablacksoildcal

7、ledferriferousoxide・Theproductisspatteredaftermeltingshowinglargeamountsofheatappearduringthereaction.)Bywatchingthevideo,wecanknowaboutthatthethinironwirecannotburnwithredheatintheair.Whilethethinironwireburnsstronglyinoxygentogivesparksandtoformablacksoildcalledferriferousox

8、ide.Theproductisspatteredaftermeltingshowinglargeamountsofhea