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1、Lecturer:林海妍10chemicaleducationclassoneStudentnumber:2010364102AlkaliMetals-SodiumKnowledgepoints:Partone:reviewwhatwelearntlastclassParttwo:learnthenewknowledge-thechemicalpropertiesofsodiumPartthree:dosomeexercisesThephysicalpropertiesofsodiumColorHardnessDensityMeltingpointBoilingpointElectricco
2、nductivityThermalconductivitySodium(Na)Silverywhitesmall0.97g/cm397.81℃882.9℃goodgoodCanbesummarizedasfivewords:white,soft,light,andguideChinesemeaning:白，软，轻，低，导ChemicalpropertiesofsodiumDiscussion:1.Doessodiummeltintoaball?Isthereanyotherphenomenon?Why?2.Whatcolorchangeshappeninthesolutionasreacti
3、ontakesplace?Whatisformedduringthereactionbetweensodiumandwater?I.SodiumreactswithwaterSodiumandwaterreactionexperimentphenomenoncanbesummarizedasfivewords:Floating,melting,tour,ring,red.Float-sodiumfloatsonwater.becausethedensityofsodiumislessthanwaterMelt-sodiummeltsintoashinyball.Becauseofthelow
4、meltingpointofsodium,sodiumreactswithwatertoreleasealotofheatandmakesodiummeltTour------sodiumballwalksinalldirectionsBecausethereactionformsgases,andgasespromotesodiumswimrapidlyinalldirectionsPayattentiontoobservephenomenacarefully!Red-solutionischangedtoredsolutionBecausegeneratedthealkalisodium
5、hydroxide(NaOH),solutioncontainsphenolphthalein(酚酞）,phenolphthaleinmeetalkaliandappearred.Ring--thereactionprocesssendout"hiss,hiss"sound.Becausereactingquickly,andformsgas.ThegenerationofH2intheairisburningandsendsoutthepoppingsound.2Na+2H2O=2NaOH+H2↑Thechemicalequation：Dosomeexercises1.Putwaterin
6、abeaker,dropphenolphthaleinsolutioninit,thenputapieceofsodiuminthisbeaker,andfinishthefollowingtable.PhenomenonofthisexperimentAnalysisofthereactionandtheequationsFloating,Melting,tour,ring,red2Na+2H2O=2NaOH+H2↑2.Whycan’twetakesodiumstraightbyhands?Becausesodiumcanreactswithwaterandformsthealkaliso
7、diumhydroxide.Thesodiumhydroxideisalkali,whichisstrongcorrosive,soitwilldoharmtous.Soweshouldtakethesodiumbytweezer.
