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1、初三化学总复习习题精选（Selectedexercisesofchemistryreviewinjuniormiddleschool）First,multiple-choicequestions1.(2009.Chongqing)thefollowingchangesbelongtochemicalchangesA.woodintopiecesofwatermelonjuiceB.Analysis:A,B,CbelongtophysicalchangesAnswer:D2,exposedtothea
2、irhasbeenpartiallydeterioratedThefollowingdiagramscancorrectlyreflectthechangesAnalysis:Atermwrong,becausehydrochloricacidoverdose,thesolutiongraduallyacidicAsaresult,thequalityofthesolutionincreasescontinuouslyAnswer:CD3,(P35)Gasmixtureofhydrogen,oxyg
3、enandnitrogenItcan'tbeA.mixtureofhydrogenandnitrogengasC.gasmixtureanalysisofhydrogen,oxygenandnitrogencannotexistsimultaneouslyintheresidualgasaftercompletereactionAnswer:C4.ThefollowingquestionsarecompletelyconsistentwiththelawofconservationofmassThe
4、qualityofA.waterremainedunchangedbeforeandaftericeformationThetotalvolumeofB.50mLwatermixedwith50mLethanolislessthanthatofwaterC.2gramsofhydrogenisignitedin20gramsofoxygenD.1.2gcarboncanreactwith3.2goxygentoproduceexactlyAnalysis:inchemicalreactions,th
5、etotalmassofthesubstancesbeforethereactionisequaltothetotalmassofeachsubstanceafterthereactionIt'sthelawofconservationofmass.Sothere'sachemicalreactionAnswer:CD5.(Nanchang,Jiangxi,2009)A.9B.11SelectedquestionsofgradethreeThefollowingchangesareattribute
6、dtochemicalchangesWatermelonjuiceintoC.,snowintowater,D.sorghumwineAllbelongtophysicalchanges.TheNaOHsamplewhichhasbeenpartiallymodifiedintheairisdissolvedinwaterandmixedwithdilutehydrochloricacidThefollowingdiagramscancorrectlyreflectthechangesBecause
7、thehydrochloricacidexcesssolutiongraduallyacidic,PHwilldecrease,andlessthan7;BThequalityofthesolutionisincreasingbecausehydrochloricaciditselfisasolution.C,Dcorrect.Themixtureofnitrogengas20g,ignitedcompletelyreactedtoproduce18GwaterB.mixedgasofoxygena
8、ndnitrogenThereisnopossibilityofsimultaneousexistenceof2H2intheresidualgasafterthecompletereactionofoxygenandnitrogenmixtureD.2Gnitrogen,N,otherwisethereactionwillcontinueThefollowingstatementsarecompletelyconsistentwiththelawofconserva
