苏打喷泉中班科学教案：用科学家时间线介绍苏打喷泉的历史

第页共页苏打喷泉中班科学教案：用科学家时间线介绍苏打喷泉的历史Scienceisafascinatingsubjectthatenablesustoexploreandunderstandtheworldaroundus.Aspartofthesciencecurriculumforpreschoolers,thestudyofchemicalreactionscanintroducethemtothewondersofscience.Oneofthemostexcitingchemicalreactionsthatcanbeinvestigatedisthereactionthatoccurswhenaddingbakingsodaandvinegartogether.Thisreactionisknownasthe"sodafountain"or"sodageyser"andisaclassicscienceexperimentthatkidsofallagesenjoy.Inthissciencelessonplan,wewilluseascientifictimelinetoexplorethehistoryofthesodafountain.Wewillstartbyexaminingthescientificdiscoveriesofearlychemistswholaidthefoundationfortheunderstandingofchemicalreactions.WewillthenmoveontothehistoryofsodafountainsinAmerica,andexplorehowtheywereonceapopularpartofAmericanculture.Finally,wewilldiscussthesciencebehindthesodafountain,andwhythisfunexperimentnevergetsold.Part1:EarlyDiscoveriesinChemistryThehistoryofthesodafountaincanbetracedbacktotheearlychemistswholaidthefoundationforourunderstandingofchemicalreactions.Aristotle,thefamousGreekphilosopher,wasoneofthefirsttowriteaboutchemicalreactions.Hebelievedthateverythingintheuniversewasmadeupoffourbasicelements-Earth,Air,Fire,andWater-andthatchemicalreactionsoccurredwhentheseelementscombinedandformednewsubstances.Inthe17thcentury,famouschemistRobertBoyleconductedexperimentsthatchangedthewaywethinkaboutgases.Hediscoveredthatgasescouldbecompressedandthatthevolumeofgaswasinverselyproportionaltothepressureappliedtoit.Thisdiscoveryledtothedevelopmentofmoderngaslaws,whicharestillinusetoday.Inthe18thcentury,famousscientistAntoineLavoisierconductedexperimentsthatpavedthewayforourmodernunderstandingofchemicalreactions.Lavoisierdiscoveredthelawofconservationofmass,whichstatesthatmattercannotbecreatedordestroyedbutonlyconvertedfromoneformtoanother.Thisdiscoveryledtothedevelopmentofmodernchemistryandtheperiodictableofelements.Part2:TheHistoryofSodaFountainsinAmericaThesodafountainasweknowittodaywasinventedintheearly19thcentury,butitwasn'tuntilthelate1800sthatitbecameapopularpartofAmericanculture.Sodafountainswerefirstusedasawaytodispensemedicine,aspharmacistswouldmixvariousingredientstocreateremediesforvariousailments.Inthelate1800s,sodafountainsbecamepopularindrugstoresandcandyshopsacrossAmerica.Peoplewouldcometotheseplacestoenjoyarefreshingdrinkandsocializewithfriends.Bytheearly1900s,sodafountainshadbecomeastapleofAmericanculture,andtheycouldbefoundinnearlyeverytownandcityinthecountry.Part3:TheScienceBehindtheSodaFountainThesodafountainisaclassicexampleofachemicalreactionbetweenvinegarandbakingsoda.Whenthetwosubstancesaremixedtogether,carbondioxidegasisproduced,whichcausesthemixturetofizzandbubble.Thisreactioniscausedbyanacid-basereaction,asvinegarisanacidandbakingsodaisabase.Thechemicalreactionbetweenvinegarandbakingsodacanbeexplainedbythefollowingequation:NaHCO3+CH3COOH-->CO2+H2O+CH3COONaInthisequation,NaHCO3representsbakingsoda,CH3COOHrepresentsvinegar,CO2representscarbondioxide,H2Orepresentswater,andCH3COONarepresentssodiumacetate.ConclusionInconclusion,thesodafountainisaclassicscienceexperimentthatkidsofallagesenjoy.Byusingascientifictimelinetoexplorethehistoryofthesodafountain,wecanseehowthisfunexperimenthasevolvedovertime.FromtheearlydiscoveriesofAristotletothemodernchemistry