emission spectra labdoc发射光谱labdoc

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1、EmissionSpectroscopyName:__________________LearningTarget:Describetheprocessofexcitationandemissionofenergybyanelectron.Thedevelopmentofatomictheoryinthelate1800’sandearly1900’shingedlargelyonobservablephenomena.Theuseofatomicemissionspectrabecamethebasisformanymodelsoftheatomandisvitalint

2、heunderstandingofenergylevelsandorbitaltheory.Thefollowingwebsitesareusefulinunderstandingthebackgroundofthetheoryanddevelopmentofatomicemissionspectra:http://science.howstuffworks.com/atom7.htmhttp://chemistry.about.com/od/analyticalchemistry/a/flametest.htmhttp://imagine.gsfc.nasa.gov/do

3、cs/science/how_l1/spectra.html*Usethesewebsitesandanswerthepre-labquestions.PleasesubmityouranswerstotheGoogleformatthefollowinglink:http://bit.ly/18NQuBj.*IwillsendyouallanemailwiththethirdlinkbecauseyoucannotreachitbytypingintheURL.PART1:SpectroscopicAnalysisofHouseholdSourcesofLightMate

4、rials:spectroscopeandcoloredpencilsProcedure:1.Obtainastudentspectroscopeandexaminethespectrumemittedbyahouseholdlightsource.2.RecordyourobservationsontheReportSheet,rememberingtodescribethespectruminwords.PART2:SpectroscopeAnalysisofGasesMaterials:spectrumtubeshighvoltagepowersupplyspectr

5、oscopecoloredpencilsSafetyAlerts:highvoltage;breakablesProcedure:1.Sincethehighvoltagesrequiredforthispartoftheexperimentmaypresentanelectricalhazard,youshouldnottouchthespectrumtubeorhigh-voltageassembly.2.Oncethepowersupplyisturnedonaimthespectroscopeattheglowingtube.Readthenumberswheree

6、achspectrumlineoccursinyourspectroscope.RecordthesepositionsontheReportSheet.3.Usingcoloredpencils,makeasketchofthespectrumontheReportSheet’sspectroscopegraph.Notethecolorsthataremostbrightandthecolorsthataremostdim.4.Oncetheentireclasshasrecordedthespectrumforthisgas,thespectrumtubewillbe

7、changed.RepeatStep2foreachofthegassamplesandrecordyourobservationsontheReportSheet.PART3:MetalIonFlameTestsMaterials:BunsenburnermatchessamplesofsaltsSafetyAlerts:goggles;openflameProcedure:1.CAUTION:Beforeyouusetheburner,checktoseethatsafetyisobserved.Ignitea