[PDF] [PDF] Temperature and Glow Sticks - Cool Cosmos

[PDF] Chemiluminescence: Glow Stick in a Beaker 9 - PS21

11 mar 2015 · Using a 100 mL graduated cylinder, add 75 mL of solution A to each beaker To the second beaker, add approximately 1 mL of fluorescein solution To the third beaker, add approximately 1/4 mL of the rhodamine B solution The addition of solution B will initiate the chemiluminescence reaction

[PDF] Experiment 9 Chemiluminescence: Glow stick in a beaker - PS-21

Chemiluminescence: Glow stick in a beaker For the Instructor All CH2Cl2 and oxalyl chloride solutions should be stored in a hood The MSDS sheets for these

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The cold ghostly fluorescent light of a glow stick easily captures the imagination of young people everywhere CHEMICAL LUMINESCENCE: The emission of

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Teacher demonstrates a glow stick by breaking it and passing it around reaction is taking place because light is emitted; exothermic reaction or chemiluminescence Beakers could be substituted with plastic/polystyrene beakers (ensure hot 

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chemiluminescence occurs in a living organism, the production of light by a firefly is also classi- plankton will leave a blue glow along the path of the stick

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Experiment #1: Chemiluminescence – Building a Glowstick Guess how o Gently place the TLC plate into the beaker and cap the beaker Vial Type of Ink 1

[PDF] Temperature and Glow Sticks - Cool Cosmos

“How Do Lightsticks Work? Learn About Chemiluminescence” Which beaker contained the glow stick that reached maximum brightness first? 4 What was the  

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Chemiluminescence: Synthesis of Cyalume and Making it Glow When you bend the light stick, the hydrogen peroxide vial breaks, the hydrogen Use a 25- mL round-bottomed flask containing a medium-sized stir bar (not the really small  

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or the yellow-green glow of a firefly You also see chemiluminescence in commercial “light” sticks All are “cool” (heatless) sources of light

pdf Chemiluminescence: Glow Stick in a Beaker 9 - PS-21

water to the beaker Add 7 5 mL of the diluted hydrogen peroxide solution that you just made to each of two 100 mL beakers Add 20 mL of dichloromethane to each beaker Add 0 005 g of 910-bis(phenylethynyl)anthracene to one beaker; label the beaker C Add 0 005 g of 910-di-

Experiment 9 Chemiluminescence: Glow stick in a beaker - PS-21

Chemiluminescence: Glow stick in a beaker For the Instructor All CH2Cl2 and oxalyl chloride solutions should be stored in a hood The MSDS sheets for these chemicals should be reviewed before the experiment In part A the carbonate buffer solution with the luminol and copper should have a pH of approximately 9 if made correctly

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TemperatureandtheRateofChemicalReactionsPurpose:Thepurposeofthislabisforstudentstoinvestigatetheeffectoftemperatureontherateofachemicalreaction.KeyScienceTopics:• KineticMolecularTheoryofHeat• Energytransformation(e.g.,chemicalenergytolight{orradiant}energy)• Electronenergylevels,absorptionandemission• FluorescenceGradeLevel:• PhysicalScience,Grades6-9StudentPriorKnowledge:• StudentsshouldbeabletodefinetheKineticMolecularTheoryofHeat.• StudentsshouldbefamiliarwiththeBohrmodeloftheatomandelectronenergylevels.• Whileitwouldbehelpfulifstudentswerefamiliarwithelectronenergylevelsandabsorption/emissionofphotons,thisactivitycouldbeusedtointroducethatconcept.Materials:Eachlabgroupshouldhavethefollowing:• ThreebeakerslabeledA,B,andC• Thermometer• Threeglowsticksthatarethesamesize,brand,andcolor• Hot,roomtemperature,andcoldwaterIhaveusedminiglowsticksuptotheregular-sizedglowsticks.Besuretohaveextraonhandassomeglowstickswillnotreact.AfterHalloweenisagoodtimetostockuponglowsticksatabargainprice.Sciencesupplystores(especiallyon-line)andpartystoresaregoodsourcesaswell.Thismayalsobedoneasateacherdemoandhavestudentsrecordthedata.Suggestions:Iusuallyusethislabasanintroductiontoatomicspectra - achallengingtopicformiddleschool,highschoolandcollegestudents.ThislabisagoodreviewofhowtheBohrmodel;whileitisanincompletedescriptionoftheatom,isagoodmodelforexplainingelectronenergylevels.Toexplainelectronenergylevels,Iusethestandardclimbingonachair,thenalabtablemethod.Whilestandingontheground,IexplainthatIamonthegroundstate.IfIabsorbjust

TemperatureandtheRateofChemicalReactionsName:_________________________________________Date:________________Pre-labquestion:WhatdoestheKinetic-MolecularTheorystate?Purpose:Forthislab,wearegoingtobetakingsomequalitativedata.Qualitativedatadescribesaqualityofanobjectorevent.Youmayhavebeenaskedinasurveytoselectanumberthatdescribedhowwellyoulikedaparticularitem;thatisanexampleofqualitativedata.Inthislab,sincewecan'tmeasurethebrightnessofaglowstick,wearegoingtorankhowbrightitiswith"1"beingbrightestand"3"beingthedimmest.Wearealsogoingtorankhowquicklytheglowstickreacheditsmaximumbrightnesswith"1"beingthequickestad"3"beingtheslowest.Materials:• Three(3)glassbeakers:o FillBeakerAwith200mLofcoldwatero FillBeakerB200mLofroomtemperaturewatero FillBeakerCwith200mLofhotwater.• Threeglowsticksthatarethesamesize,brand,andcolor.• ThermometerProcedure:1. Recordthewatertemperatureofeachbeakerinthetablebelow.2. Ifyourglowsticksareinapackage,removethemfromthepackage,butdonotbreakthemyet!3. Onceeveryonehasrecordedthewatertemperatureofthebeakers,theteacherwillturnoutthelights.4. Oncethelightsareout,breakthethreeglowsticksatthesametimeandimmediatelyplaceoneglowstickineachcup.5. Observehowbrighteachglowstickisandhowquicklyitreachedmaximumbrightness.6. RanktheglowsticksbasedontheirbrightnessandhowquicklytheyreachmaximumbrightnessandrecordinTable1below:

Table1:BeakerWaterTemperature,°CBrightness("1"=Brightest,"3"=Dimmest)Howquicklyglowstickreachedmaximum"glow"("1"=Quickest,"3"Slowest)ABCQuestions:1. Whichbeakercontainedthebrightestglowstick?2. Whatwasthewatertemperatureinthatbeaker?3. Whichbeakercontainedtheglowstickthatreachedmaximumbrightnessfirst?4. Whatwasthewatertemperatureinthatbeaker?5. Howdoesthewatertemperatureaffecttherateofthechemicalreactionoccurringinaglowstick?ExplainthisresultusingyourknowledgeoftheKineticMolecularTheoryofHeat.6. Whatevidencedoyouhavethatachemicalreactiontookplace?

TeacherAnswerKeyTemperatureandtheRateofChemicalReactionsName:___________Key____________________________Date:________________Pre-labquestion:WhatdoestheKinetic-MolecularTheorystate?TheKineticMolecularTheoryofHeatstatesthatmoleculesinafluidincreasetheirspeedincreasesastemperatureincreases.Purpose:Thepurposeofthislabistodeterminetheeffectoftemperatureontherateofachemicalreaction.Forthislab,wearegoingtobetakingsomequalitativedata.Qualitativedatadescribesaqualityofanobjectorevent.Youmayhavebeenaskedinasurveytoselectanumberthatdescribedhowwellyoulikedaparticularitem;thatisanexampleofqualitativedata.Inthislab,sincewecan'tmeasurethebrightnessofaglowstick,wearegoingtorankhowbrightitiswith"1"beingbrightestand"3"beingthedimmest.Wearealsogoingtorankhowquicklytheglowstickreacheditsmaximumbrightnesswith"1"beingthequickestad"3"beingtheslowest.Materials:• Three(3)glassbeakers:o FillBeakerAwith200mLofcoldwatero FillBeakerB200mLofroomtemperaturewatero FillBeakerCwith200mLofhotwater.• Threeglowsticksthatarethesamesize,brand,andcolor.• ThermometerProcedure:7. Recordthewatertemperatureofeachbeakerinthetablebelow.8. Ifyourglowsticksareinapackage,removethemfromthepackage,butdonotbreakthemyet!9. Onceeveryonehasrecordedthewatertemperatureofthebeakers,theteacherwillturnoutthelights.10. Oncethelightsareout,breakthethreeglowsticksatthesametimeandimmediatelyplaceoneglowstickineachcup.11. Observehowbrighteachglowstickisandhowquicklyitreachedmaximumbrightness.12. RanktheglowsticksbasedontheirbrightnessandhowquicklytheyreachmaximumbrightnessandrecordinTable1below:

Table1:BeakerWaterTemperature,°CBrightness("1"=Brightest,"3"=Dimmest)Howquicklyglowstickreachedmaximum"glow"("1"=Quickest,"3"Slowest)A5°C33B20°C22C66°C11Questions:7. Whichbeakercontainedthebrightestglowstick?BeakerC8. Whatwasthewatertemperatureinthatbeaker?Hotwater(T=66°C)9. Whichbeakercontainedtheglowstickthatreachedmaximumbrightnessfirst?BeakerC10. Whatwasthewatertemperatureinthatbeaker?Hotwater(T=66°C)11. Howdoesthewatertemperatureaffecttherateofthechemicalreactionoccurringinaglowstick?ExplainthisresultusingyourknowledgeoftheKineticMolecularTheoryofHeat.Theglowstickinthehotwaterhadafasterreactionrate.TheKineticMolecularTheoryofHeatstatesthatparticlesinafluidincreasetheirspeedastemperatureincreases.Thehotwaterhasfastermovingparticlesthanthecoldandroomtemperaturewater.Thesefast-movingparticlescollidewiththeglowstick,transferringenergy.Thiscausestheliquidparticlesintheglowsticktomovequicker,increasingtherateofthechemicalreaction.12. Whatevidencedoyouhavethatachemicalreactiontookplace?Emissionoflightisoneofthesixindicatorsofachemicalreaction.

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