University:
Mississippi College
Course:
CHE 141 | General Chemistry I
Academic year:

2022
Views:

400

Pages:

4
Author:

Abby D.

The QM Model of the Atom Pt.2In some cases,"light"is best described not as a "wave", but "particle"ThePhotoelectriceffect:HighElightcandislodgee-'sfrommetals.observation:nometalxe--metal#even verynightampvidionabledislodgee-Electrons were dislodged by vidim light as long asz high.was influential on E!!EinsteinsSolution:that wastoolowYorkmetalmetalphotonminimanEphoton=hfrequency6.626x1034J.S(Plank'scst)?CanwecalculateoflightthathasaEpnoton=hrC=222=cV=3.00x10mis2210gmV=2.67x1d"s=1.767x1079JA 100W,Howmanyemitted-second?PIW=152=525nmC=RVU=C5,25x10tmEpnoton=hz2Ephoton=h2V=3.00x108m/sX10145(5.25x107th3.786x10-99(3.786x10'9)photon1005= 2.64x102 20 photons/s CANTAtomic Spec trascopy(science behind fireworks ,neonsigns, flametests..when atoms are exposed to energy celectricity neat, flame), theywill absorb E but then immediately emit that E in the formvisible light Ccharacteristic color)V. distinct wovelengths 2 are emitted theatonsemissionspectrumlonique to each element. like fingerprint)Bohr attempted to explain this phenomenonBourmodelBonr Model of the atum:light)G-Slivein"StationarystatesCorbits),oneyprotecotW/ a distint value.=3e-s c a cantransition(instantaneously)bt<0=2Stationarystatesifaphotonisabsorbed41+n=1nucleusoremittedEphoton = -2.18x102(falling or gollegue orbitals)nfrain initial? Calc the the photon that is emitted when one- fallsfrom(Hatem)12n=4 12.2.what color is photon?(4) (16)emittedcoming -4.0875 x10-195 2nd Ephoton=h2 2 = EpnotonhC=R2V= 44.0875 x10198TV3rd6.626 x10-34 S.S2=f 2=3.00x108M15V=6.168x10156.168x10'45Zinnm2=4.86x107 m 10'nmIm486nmcolorblue10 am2n comeKey Pt of QM model: Just like light e-'s have both a particle &a wave nature!particle nature position can'tneverThe havedeBrogliewave nature:velocityknow the masse- position and velocityTher fore we can only caic@ the same time.Probabilities of where an atom is most likely to beShroedinger did the Probability carc about where(in an atom)e'-s could be His solutions to his equations lead to "orbitals"30 zones e:-can live.Quantum Numbers (solins to schroedinger's equations)4 of them (n l, me,msdescribedescribes e-or bitalsin the orbitauseachutherPrincipal QN(n)Angular Momentum QN())Magnetic QN (me)depends own-dependsonePossible values:Possible values: l canPossible Values:n can be 1,2,3,etcbe all whole numbersme can be all whole #ers(cantbe zero,mustfrom 0 to n-l.b+-l lbe a pos. interger#)If n=l l can be 0significance: nn=2. l can be OE I-2describes SIZEn=3l can be 0,1,2Ifl=o me can be O& ENERGY of then=4 l can be 0,1,2,3l=1, me can be -1,0,+1or bital as nisselSignificance: l describesl=2, me can be -2,-1, 9,+1,+2the SHAPE of the orbital.l=3,mecan be (-3,-2,-1, O,th,+2,lShape+3.OS-2lobessignificance: me describesIP-nodeOrientation of the orbital in(nucleus)2d-2 nodesspace.3 f-complexlobesl=O(s orbitals)only oneorbitall=3(f orbitals)l= 2ld orbitals)only one orientationdiff7diff orie ntations)0000.00Pxorienations)00000000l=1 orbitals)003 diff orientations2J2 7cant3pg"orbital"2P3pytestnme+AlCONNOCspyAHCalorimetry Notes3pylower C]lower intensity vice/versalWhite light - absorbs all colors Cemmits a certain COLORtransmitted comes through, absurbed snows the colorBeer's Law: A=ElC (in lab manual) - unique to it's owncompandabsorbanceCamt. of lightthat get absorbed)Absorbance is proportional to concentration#vontsl-tdESP-0(84without9sauge7EDJS -lJE