ap chemistry day 12 - ms....
TRANSCRIPT
![Page 1: AP Chemistry Day 12 - Ms. Flemingflemingapchem.weebly.com/uploads/2/4/6/5/24658308/ap_chem_chapter_unit... · Do-Now: – Now, we will complete an FRQ analysis. – Use the key and](https://reader033.vdocuments.site/reader033/viewer/2022042005/5e6f6348f0c88c3321181b01/html5/thumbnails/1.jpg)
Wednesday,September27th,2017
APChemistryDay12
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Do-Now:TakeoutyourFRQpacketandturntoFRQ#4:1. Usetheanswerkeytoreviewyour
response2. Keepinmind:APFRQkeysare
guidelinestellinggraderswhattolookfor.Theyarenotgivingyoucompleteresponses.
3. GiveyourselfanapproximatescoreforeachsecHon,andgiveyourselfatotaloutof6points
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Do-Now:– Now,wewillcompleteanFRQanalysis.– Usethekeyandyourresponsetocompletetheworksheet.
– Discusswithyourgroupifneeded– Evenifyouthinkyoureceivedfullpoints,thinkabouthowyoucouldrewriteyouranswertoexpressyourideasclearly,concisely,andinalogicalflow.
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Announcements• UnitTest
– Bringcalculatorsandreferencesheets– FRQ/ResponsesecKononFriday– MCsecKononTuesday
• Labnextweek• Tradeindojopoints
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CW/HWAssignments15. FRQMeta-Analysis9/2716. MassSpecNotes+Packet9/27
PLANNER • StudyfortestJJJ• Getallstamps• FinishFRQMeta-AnalysisandMassSpec.packet
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FLT• Iwillbeableto:– UsedatafrommassspectrometrytoidenKfytheelementsandthemassesofindividualatomsofaspecificelement
– JusKfytheselecKonofaparKculartypeofspectroscopytomeasureproperKesassociatedwithvibraKonalorelectronicmoKonsofmolecules
• Bycomple1ngMassSpecNotes
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MassSpectrometry
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Recall
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PhotoelectronSpectroscopy(PES)
• UsingPES,wecanidenKfyspecificelementsandalsocomparetheirionizaKonenergiesforspecificelectrons
IdealizedPESspectrumofphosphorus
IdealizedPESspectraofboronandfluorine
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PhotoelectronSpectroscopy(PES)
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Isotopes
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Isotopes• AreallatomsofagivenelementidenKcal?• Whileatomsareneutralandhaveequivalentnumbersofprotonsandelectrons...
• Thenumberofneutronsmaydiffer• Becauseatomsmayhavevaryingnumbersofneutrons,theirmassmayalsodiffer
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Isotopes• FrederickSoddy(1877-1956)proposedtheideaofisotopesin1912
• Isotopes=atomsofthesameelementhavingdifferentmasses,duetovaryingnumbersofneutrons.
• SoddywontheNobelPrizeinChemistryin1921forhisworkwithisotopesandradioacKvematerials.
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Isotopes
• Elements occur in nature as mixtures of isotopes.
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AverageAtomicMass
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Atomic Mass§ Whatisthemassofanatomofoxygen?§ Itdepends,becausetherearedifferentkindsofoxygenatoms.
§ Wearemoreconcernedwiththeaverageatomicmass.
§ Averageatomicmass=weightedaverageoftheisotopesofagivenelementbasedontheabundance(%)innature
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Atomic Mass• Each isotope has its own atomic
mass, thus we determine the average from percent abundance.
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Calculating Atomic Mass• MulKplytheatomicmassofeachisotopebyitsabundance(expressedasadecimal),thenaddtheresults.
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Example• Calculatetheaverageatomicmassofoxygen
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Trythisoneinyourgroups:
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SoluKon• a):
• Letx=abundanceofNe-20• 19.99x+21.00(1-x)=20.18• x=0.905• %abundaceNe-20=90.5%,Ne-22=9.5%
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Average Atomic mass• ButhowdoscienKstsdeterminepercentabundanceandaverageatomicmass?
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MassSpectrometry
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MassSpectrometry• MassspectrometryprovidesmasstochargeraKoandprovidesuswithinformaKontodeterminethemolecularmassofatoms/moleculesinasample.
• High-energyelectronsbombardthesample,causingittoionize
• AnelectricfieldseparatestheionsbasedontheirmasstochargeraKoàthisdataiscompiledintoamassspectrum
• (itseparatesisotopesbymass)
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MassSpectrometry
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MassSpectrometry• LikePES,therelaKvesizeofthepeaksindicatestherelaKvenumberofparKcles
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MassSpectrometry• Basedonthisspectrum,whatisthemostcommonisotopeofzirconiuminoursample?
• Zr-90hasthehighestintensity(tallestpeak),soitisthemostcommon
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MassSpectrometry• GivenZr-90is89.905amu,Zr-91is90.906amu,Zr-92is91.905amu,Zr-94is93.906amu,andZr-96is95.908amu,calculatetheaverageatomicmassofzirconium.
• Seehowcloseyougetto91.22
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BasedonthemassspectrumofatomY,whichofthefollowingstatementsisfalse?
a.peakAandpeakDcomefromatomsthathavethesamenumberofelectronsb.therearesevenisotopesofatomYc.peakCcomesfromthemostabundantisotopeofatomYd.peakDcomesfromanatomwith4moreprotonsthantheatomthatgavepeakB
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Theiden1tyofcompoundYis:a. Zirconiumb. Molybdenumc. Americiumd. Einsteinium
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Whichpeakcomesfromanatomwiththegreatestnumberofneutrons?a. Ab. Cc. Dd. Allpeakshavethesamenumberofneutrons
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CW• MassSpecpacket
– ThispacketgoesbeyondthelevelofunderstandingrequiredontheAP
– FocusoninterpreKng/explaining/calculaKngmorethanunderstandinghowitworks
– AjemptallquesKons
• Studyforquiz