高中化学基础知识Basic knowledge of high school chemistry.docx
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高中化学基础知识Basic knowledge of high school chemistry.docx
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高中化学基础知识Basicknowledgeofhighschoolchemistry
高中化学基础知识(Basicknowledgeofhighschoolchemistry)
Highschoolchemistry,knowledgepoints,concept,alotofthingsareveryabstract,difficulttounderstand,toreviewthegreatdifficulty,Weifangyoungteacherstocreatehighschoolchemistryaimstohelpthestudentsarestudyinganddeepentheirunderstandingofthechemistryofhighschool,tohelpthemsolvethedifficultiesencounteredinlearning.
Catalog
Safetyofchemicalexperiment
Separationandpurificationofmixtures
Iontest
Aunitofquantityofmatter
Theapplicationofquantityofmatterinchemistryexperiment
Chemicalsandtheirchanges
Metalsandtheircompounds
Nonmetalsandtheircompounds
Testofchlorideion
Nitricoxideandnitrogendioxide
Ammoniaandammoniumsaltchemicalexperimentsafety
Separationandpurificationofmixtures
Iontest
Aunitofquantityofmatter
Theapplicationofquantityofmatterinchemistryexperiment
Chemicalsandtheirchanges
Metalsandtheircompounds
Nonmetalsandtheircompounds
Testsforchlorideion,nitricoxideandnitrogendioxide,ammoniaandammoniumsalts
Safetyofchemicalexperiment
1,
(1)thetestofpoisonousgasshouldbecarriedoutintheventilatedkitchen,andattentionshouldbepaidtothepropertreatmentofexhaustgas(absorptionorignition,etc.).Whenconductinginflammableandexplosivegasexperiments,itshouldbeobservedthatthetailgasshouldbeburnedorproperlytreated.
(2)burnshouldbetreatedbyadoctor.(3)concentratedacidsprinkledontheexperimentaltable,firstwithNa2CO3(orNaHCO3)neutralization,andthenwashedcleanwithwater.Concentratedacidstainedontheskin,itshouldbewipedwithadrycloth,andthenrinsewithwater.ConcentratedacidsplashintheeyeshouldbedilutedwithdiluteNaHCO3solution,andthenaskthedoctortodealwith.(4)concentratedalkaliontheexperimentaltable,firstdilutewithaceticacidneutralization,andthenwashedcleanwithwater.Concentratedalkaliontheskin,itshouldfirstflushwithalargeamountofwater,andthencoatedwithboricacidsolution.Concentratedalkalisplashintheeye,rinsewithwaterandthenrinsewithboricacidsolution.(5)sodium,phosphorusandotherfiresshouldbecoveredwithsand.(6)asmallareaofalcoholandotherflammableorganicmatteriscaughtfire.Itshouldbequicklywashedwithadampcloth.
Separationandpurificationofmixtures
Theapplicationshouldpayattentiontomattersofmaterialseparationandpurificationmethodforexamplefiltrationforsolid-liquidseparationmixedapaste,twolowandthreebydistillationandpurificationsuchaspurificationorseparationofliquidmixturesofdifferentboilingpointstopreventliquidsaltbumping,themercurythermometeristhepositionoftheball,theflowofthewatersolubilityofdifferentcondensationdistillationsuchasoildistillationsuchastheuseofoilextractionofsoluteinanimmisciblesolvent,asolventextractionagentselectionmethodofsolutefromitssolutionandanothersolventcompositionoftheextractshouldmeetthefollowingrequirements:
theoriginalandthesolventimmiscible;opentheupperendofthepistonorthegroovethepistonandthefunnelwateronthesolubilityofthesoluteismuchlargerthantheoriginalsolventwithbromineincarbontetrachlorideextractionofbromineandiodineliquidseparationofimmiscibleliquidsTheairiscommunicatedwiththeairinsideandoutsidethefunnel.Openthepiston,thepistonclosesslowlylowerliquidoutflow,inatimelymanner,theupperliquidpouredoutfromtheupperendasbyheatingamixtureofevaporationofbromineandiodinebromineincarbontetrachlorideextractionintoliquidafterevaporationandcrystallizationforseparationandpurificationofseveralsolublesolidsolutionevaporates,withaglassrodtostirmoreevaporationwhenthesolidsolution;inthedish,stopheatingseparationofNaClandKNO3mixture
Iontest
ThephenomenonofionionequationClAgNO3reagent,diluteHNO3whiteprecipitateproducedCl+Ag+AgCl=SO42-:
diluteHClprecipitationformula,BaCl2whiteprecipitateSO42-+Ba2+=BaSO4downthemostcommonshouldhave:
alkalisodiumpotassiumcalciumandbarium,besidesisinsolubleinwater;bariumsulfate,leadwatersolublechloridesalt,silvercarbonateinpotassiumsodiumsolutionunder.K+,Na+,K+(throughthepurpleflame,cobaltblueglass)Na+yellow.Fe3+usesKSCNsolutiontogenerateredsubstancesFe(SCN)3.,Br-andI-,usingadiluteHNO3acidifiedAgNO3solutionBr-toproduceapaleyellowprecipitatethatisinsolubleindilutenitricacid,andI-producesayellowprecipitatethatisinsolubleindilutenitricacid.
Afterthereleaseofcarbonateionswithhydrochloricacidiscolorlessandodorlessandmakeclearlimewaterturbidgases:
carbondioxide.Ammoniaionswithconcentratedsodiumhydroxide,heatedtoproduceapungentodor,wetredlitmusblueNH3.fourgasimpurity.Note:
1,inordertomaketheimpurity,reagentcannotjoinis"appropriate",butshouldbe"excessive",becauseyoucannotguaranteethataddingsolventtheamountofonlyexcessionsorionclustersinthesubsequentoperationmustbeeasytoremove.2.Makesurethatnewimpurityparticlesarenotintroduced,andevenifadded,theymustberemovedinsubsequentoperations
Aunitofquantityofmatter
1.thequantityofasubstance(n)isthephysicalquantityofacollectivecontainingacertainnumberofparticles.2.moles(mol):
measureanyparticleof23squareparticlescontaining6.02x10particlesinto1moles.3.:
theAvogadroconstant23timesmol-1iscalledAvogadroconstant6.02X10.4.oftheamountofsubstancesubstancecontainingparticlenumber=5.=N/NAn/Avogadroconstantmolarmass(M)
(1)definition:
massperunitamountofsubstanceofthematerialiscalledmolarmass.
(2):
g/molorg..Mol-1(3):
numericalrelativeatomicmassorrelativemolecularmassisequaltotheparticlequality/quantity=6..Materialmaterialmolarmass(n=m/M)six,themolarvolumeofgas1.gasmolarvolume(Vm)
(1)definition:
gasunitmolarvolumecalledthemolarvolumeofgas.
(2):
unitvolume=L/mol2.gasvolume/materialthemolarvolumeofgasn=V/Vm3.standardcondition,Vm=22.4L/mol
Theapplicationofquantityofmatterinchemistryexperiment
1.theconcentrationofasubstance.
(1)definedastheamountofsubstanceinthesolutionofasolutecontainedinaunitvolumesolution.ThephysicalquantityofthesolutioniscalledtheconcentrationofthesubstanceBofthesoluteB.
(2):
mol/L(3)theamountofsubstanceconcentration=theamountofsolutematerial/solutionvolumeCB=nB/V2.acertainamountofsubstanceconcentrationofcompound
(1):
accordingtothebasicprincipleofconcentrationforvolumeandsolutesolutionofthematerial,methodofcalculationforconcentrationofrelatedsubstancesandcalculatethemassorvolumerequiredforthesoluteinthecontainerwillbedilutedwithsolventandsolutetoaspecifiedvolume,havetopreparedsolution.
(2)themainoperationoftheA.testwhetherthe.B.solution,WaterLeakage1.2.3,weighing,dissolution,transfer,5.4.,washing.The6fixedvolume.7.8,shake,storagesolution.Note:
Aselectionandpreparationfortheflaskvolumeofsolutionthesame.Bmustbecheckedbeforeuse.WaterLeakagewhetherCcannotbedirectlydissolvedinavolumetricflask.Ddissolvedaftersolutionandthentransfertocoolingatroomtemperature.EconstantvolumeWhentheliquidlevelis1to2cmawayfromthecalibrationline,useadroppertoobservethewaterheadtothelowestpointoftheliquidsurfacebytheheadupmethod.3.solutionisdiluted:
C(concentratedsolution),V(concentratedsolution),=C(dilutesolution),V(dilutesolution)
Chemicalsandtheirchanges
Asysteminwhichsubstances(orsubstances)aredispersedinanother(ormore)substance,knownasdispersions.Substancesdispersedarecalleddispersions(gases,liquids,solids).Substancesthatactasdispersingagentsarecalleddispersants(gases,liquids,solids).Threekindsofcolloidalsolution,emulsion,dispersion,scatteredmatterparticlesize/nmappearancecanpassthroughthefilterpaperortheTyndalleffectwaslessthan1examplesofuniform,transparentandstablewithoutNaCl,sucrosesolutionin1-100betweencolloidaluniform,transparentandstabletosomeFe(OH)3colloidemulsionchemicalchangesmorethan100chemicalchangesisnotuniform,opaqueandunstablewithoutslurrytwo,materialcanoccurinavarietyof1,betweensubstances,accordingtocertainstandardscanbeusedtoclassifychemicalchanges.
(1)accordingtothereactantsandproductscategoriesandhowmanyspeciesofthereactioncanbedividedinto:
A,chemicalreaction(A+B=AB),B(AB=A+B)C,thedecompositionreactionofreplacementreaction(A+BC=AC+B),Dmetathesis(AB+CD=AD+CB)reaction
(2)accordingtowhetherisinthethereactionisdividedinto:
A,ionreaction:
thereareaclassofreactiveioninthe.Thereactionsmainlyinvolvemetathesisandredoxreactionsinvolvingions.B,molecularreaction(nonionicreaction)(3)accordingtowhetherthereisareactionintheelectrontransferreactioncanbedividedinto:
A,redoxreaction:
thereactionofelectrontransfer(gainoroffset)ofthereactionsubstance:
theelectrontransfer(gainoroffset)features:
thevalenceofelementsbeforeandafterthereactionwiththechangeofBandnonredoxreaction,2ionreaction
(1),electrolyte:
conductivecompoundsinaqueoussolutionormeltstate,calledelectrolyte.Acids,alkalis,andsaltsareelectrolytes.Acompoundthatcannotconductelectricityinaqueoussolutionormoltenstate;iscalledanonelectro
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