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ID:20894456
大小:1.71 MB
页数:26页
时间:2018-10-17
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1、BunsenBurnerIntroducingScienceInthischapter,youwilllearn:WhatisaBunsenburner.HowtousetheBunsenburner.HeatingsubstanceswithaBunsenburner.Findoutwhichflameishotter.ABunsenBurnerThefirstBunsenburnerOutercoreInnercoreBurnertubeStopcockCollarRobertBunsenWeheatthingswithaBunsenburner(本生燈)inthela
2、boratory.RobertBunsen,aGermanchemist,inventedthisapparatusin1855.ABunsenBurnerWhatarethepartsofaBunsenburner?Labelthediagramusingthesewords.airholechimneycollartubinggastapchimneyairholecollartubinggastapHowdoweuseaBunsenburner?1.Jointheburnertoagastap.HowdoweuseaBunsenburner?2.Closetheair
3、hole.HowdoweuseaBunsenburner?3.Lightamatchandholditoverthechimney.Turnonthegastap.TheBunsenflameIWhatwillbethecolouroftheflamewhentheairholeisclosed?Thisisaluminousflame.TheBunsenflameIIOpentheairholeslowly.Whatwillbethecolouroftheflamewhentheairholeisopened?Thisisanon-luminousflame.Checkp
4、ointUsesuitablewordstofillintheblanks.Thenon-luminousflameis(a)incolour.Theluminousflameis(b)incolour.The(c)flameiseasiertosee.(a)yellow(b)blue(c)luminousFlameIwithairholeCLOSEDyellowincolourluminousFlameIIwithairholeOPENEDblueincolournon-luminousWhichkindofflameishotter???Howtoknowwhichfl
5、ameishotter?Tocontacttheflamewithyourhand?Tomeasurethetemperaturebyathermometer?XXTocomparethetimetakentomakethewaterboiled?Howtoheatanobject?(1)Theapparatususedintheprocedureofheating:Whatarethese?TripodBunsenBurnerWiregauzeBeakerHowtoheatanobject?(2)1.PrepareaBunsenBurner2.Putatripodover
6、theBunsenBurner3PlaceawiregauzeontothetripodHowtoheatanobject?(3)4.Putabeakerontothewiregauze5.ThenaddwaterintothebeakerMeasuringthetimetakentoboilacertainamountofwaterFillabeakerwith50cm3oftapwaterSetuptheapparatusasshowninthediagramHeatthewaterwithaflameofBunsenBurneruntilitboilsUsestop-
7、watchtofindoutthetimetakenStop-watchExperimentstocomparewhichflameishotterExperiment1withtheairholeofBunsenBurnerCLOSEDyellowflameExperiment2withtheairholeofBunsenBurnerOPENEDblueflameExperiment1(a)LightaBunsenBurnerwiththeairholeclosedLightamatchandholditove
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