资源描述：
《水的组成、分子和原子（composition, molecules and atoms of water）》由会员上传分享，免费在线阅读，更多相关内容在教育资源-天天文库。
1、水的组成、分子和原子（Composition,moleculesandatomsofwater）[integrationoflearningobjectives]1.accordingtotheexperimentofelectrolysiswater,weknowthecompositionofwater.2.understandthedifferencebetweensinglesubstanceandcompound.3.understandtheprocessandmethodofhumanunderstandingofthematerial
2、world.4.understandingmatterismadeupoftinyparticlessuchasmoleculesandatoms.The5.moleculeisthesmallestparticlethatkeepsthechemicalpropertiesofthematerial;theatomisthesmallestparticleinthechemicalchange.Thebasiccharacteristicsof6.molecules,andcanexplainthephenomenon7.cultivateabst
3、ractthinkingability,imaginationandanalysisandreasoningability.Emphasis:determinethecompositionofwateraccordingtotheexperimentofelectrolysiswater;explainsomephenomenafromtheviewpointofmoleculeandatom.Difficulty:thedistinctionbetweensinglecompoundsandcompounds;theunderstandingofm
4、olecularandatomicconcepts.[keypointsofknowledge]Knowledgepoint1:electrolysisexperimentofwater1.experimentalinstruments:waterelectrolyzer(orsinkandtesttube),DCpowersupply,alcohollamp.2.experimentaldrugs:water,sodiumhydroxide(ordilutesulfuricacid).3.experimentaloperation:asshowni
5、nfigures7-1and7-2,fillupthewaterinthewaterelectrolyzer(ortesttube)andaddasmallamountofsodiumhydroxide(ordilutesulfuricacid)tothewatertoturnonthepowersupply.4.experimentalphenomenon:therearebubblesontheelectrode,afteraperiodoftime,thepositivegasisless,andthenegativegasismore;the
6、volumeratioofpositiveandnegativegasis1:2.5.testgas:figure7-2shows,with1inthewoodgastesttubewithMars,foundthewoodagain,thatistheoxygengasinthetube;2closetotheflame,gascombustion,flameislightblue,thatishydrogen.6.experimentalresults:undertheactionofdirectcurrent,waterreactschemic
7、allytoproducehydrogenandoxygen.Literalexpression:water,hydrogen,oxygenH2OH2O27.experimentalanalysis:hydrogeniscomposedofhydrogenelements,oxygeniscomposedofoxygenelements,whichshowsthatwaterisnotcomposedofoneelement,butbyhydrogen,oxygentwoelements.[keypointsinterpretation]1.theo
8、retically,thevolumeratioofthegasinthetesttubeconnected
