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1、液体之间的溶解现象（Dissolutionbetweenliquids）Teachingfragments(observationdissolvedinwaterglueandshampoo)Teacher:"wehavelearnedthe"water"and"waterdissolvedsomeofthematerialishowtodissolvematerials",learned,PotassiumPermanganateinthedissolutionprocessofsaltwater.Theteacher
2、nowwanttoaskthestudents,likesalt,PotassiumPermanganate,itbelongstotheliquid,solidorgas?"Sheng:solid."(letthestudentsreallysalt,PotassiumPermanganatestate)Teacher:"beforeweweredissolvedinwaterinsolidlearning,thestudentsthink,whethertheliquidcouldbelikePotassiumPer
3、manganateassaltanddissolvedinwater?"Sheng:noway!Likeedibleoil!"Sheng:yes!Forexample,weusesoysauceandvinegarinourhouse."Sheng:yes!"Sheng::LetstudentsanswerfreelyandstimulatetheirinterestinlearningTeacher:"todaywewillcometogethertoexplorethephenomenonofdissolutionb
4、etweenliquids.""Writingontheblackboard:dissolutionbetweenliquids"Teacher:"herearetheglueandshampoo,let'slookatwhattheylooklike?"Student:"glueistransparent."."Student:"shampooliquid."Student:"theshampooiswhite."Student:"glueisliquid."."(trainstudents'observationab
5、ilityandlanguageexpressionability)Teacher:"byobservation,doweknowwhethertheybelongtoliquidorsolid?""Sheng:liquid"Teacher:"iftheteacherputglueandshampoointothewater,theycandissolveinwaterlikePotassiumPermanganate?Sheng:No"Student:"yes,ifnotdissolved,howdowewashour
6、hair?""Student:"Ialsofeeldissolved,justasmyclassmatessaid."."LetthestudentspredicttheresultsTeacher:"westillhavetotesttoseeiftheycanbedissolved."!Yousayit'snotgood!"Sheng:good."Teacher:"dotheglueandshampooinsolubilityinwater,weneedsomehelpwithequipmentobservation
7、,experimentalequipmentwehavetwowaterfilledbeaker,abottleofglue,abottleofshampoo,asmallspoonandchopsticksExplaintheexperimentstepsanddemonstratetheexperimentTeacher:"takeaspoonofglue,slowlypouredintoabeakerofwater,thestudentsobservetheglueishowtoenterthewater."Stu
8、dent:"slowlyenteringthewater."."Teacher:"doweseegluefloatingorsinkinginthewater?""Student:"itsanktothebottomofthewater."."Teacher:"howdoesthegluediffuseinthewa
