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1、九年级化学全书重难点全册.doc（Ninegradechemistrycompleteanddifficultwholebook.Doc）Ninegradechemistrycompleteanddifficultwholebook.DocFirst,walkintotheworldofChemistry1.Whatischemistry?2.Howtolearnchemistry?(1)themethodoflearningchemistry:experimentalinquiry;(2)theto
2、oloflearningchemistryistheperiodictableofelements;(3)thecharacteristicsofchemistrylearningare:threeconcerns(payingattentiontothecomposition,structure,nature,changelawofmatter)3basicskillsofchemicalexperiments:Theuseofdrugs.Solidpowder,spoonorpapergroove
3、;solidblock,tweezers;asmallamountofliquid,thedropper;acertainamountofliquid,oraburette;dosagedidnotexplaintheexperiment,generallywiththeleastamountofliquid;1-2ml,solidcoveredthebottomofthetube.Materialheating.Heatinginstrumentiscommonlyused(alcohollampw
4、ickcutflushwithwine,buttheshoulder,heatingintheouterflame,flametemperatureislow,withacap,thelightsblowingmostbogey).Forsolidmaterial(heatingtubefixediron,ironclampfromthemouththree,heatingtubedeclinate,avoidingthereturnpipewascracked,solidtileneartheend
5、ofthepipe,themovingflameafterusetobeevenlyheated,thenremovecold,washstendyMoworry).Heatingliquidmaterial(liquidliquidisthreepointsone,outerwallisdry,antiburningcrack,woodholdingtubehandlehandle,45degreesinclinedtoheating,liquidbottomheatingevenly,pipemo
6、uthisempty,notperson).Thewashingofinstruments(glassware).Standard:theinnerwallisadheredtothewaterfilmevenly,anditcannotdriptogether.Methods:usehairbrush,rinsewithdetergentandwater.Specialoil,alkalimetaloxideandcarbonatewithwaterinsolubleindilutehydrochl
7、oricacidcleaning,withmanganesedioxide,PotassiumPermanganatewithconcentratedhydrochloricacidwashoilwithhotalkalisuchassodiumcarbonatecleaning.Collectionofgases.Thedrainagemethodissuitableforgaseswhicharenotsolubleinwateroraredifficulttodissolveinwaterand
8、donotreactwithwater.Theupperairmethodissuitableforgaseswithgreatergasdensitythanair.Thedownwardexhaustairmethodissuitableforgaseswithsmallergasdensitythanair.Secondtalkabouttheairaroundus1.CompositionofairAccordingtothevolumecalc
