bunsen burner

《bunsen burner》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、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