Description
CHEM 20A 2018 FALL STUDY GUIDE
MIDTERE TWO
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CHAPTERS. QUchum. Mechanics I Atomic Structure
Sul The Hydrogen. Atom
Xoneelectron model the energy very depends only on the
distance of electron from the nucleus.
No angular orientation *Spherical Cordelicates
2 0. How much Zaxis fX=sind cose I y = nsino.sing We also discuss several other topics like Does neuroscience really bear on the truth of theories of moral motivation?
* T: distance Txty + 3 = 12 * Energy levels
E=en= enzt;2133+). simplify the constants
En= (Ruelbery) TRydberg = 2,198 x 10 J=13.6ev.
nis called principle quantum number _Eclepenels only.onn as povertical depends only onk. If you want to learn more check out What are the 3 clusters of pds?
Schöchinger Equestion. caliso quantizes Esquerer h eutt) 2 3 4 = 0.12 ha)
Progean = mzt e Tm=2,741, ... 01,... 11, 1) We also discuss several other topics like What are the forms of integration at the farmer?
e is called angulier momentiun quicultura munbec Whis called magnetic_quan _kumber For natuttom=of +8et of thitimt)=n For n=27ttom=0 tit=tm=Ot7)] 4 sets.=n?  conventional label method to:s ble plz:d l=3R. *Wave Functions
 spherical harmonics 46100) = Baiba Kemlere spherically symmetric potential We also discuss several other topics like How can we identify dipoledipole forces?
 Racial Angular energy function. Probability density at a particularpoint
themel& P = RmxPC Lambec61d6. dlcxcy.cz
=tšinódriloc
LAND
center
probabilioy of fineling ian electimai Niepdv = US 140Xy.33l?dzdy dz. 140%. yo ;) x Volume Searches * Sizes & Shapes of Orbitals We also discuss several other topics like What does confidence interval denote?
10 ) for Z=1.0=tat the first Bohr abit of Hector Radial behavior or Contair Plant R4 1 00 noeffect Don't forget about the age old question of What are the strong acids?
I sabitals e=0
to_Y=onstant 
radial nodes =n11=0
xaxis
uxi's
radiat probability density. (Elnur Radial
volume density  porbitals. 671 hot spherically symmetrit
che cosoáz (000= TU max_co=&min – Zaxis. Same shape şi
epey Ypx=a(Y +Y, YP = C2 CYA14)
TABAT
AT AT TEST I W Lorena  I orbituls l=2
dxy dyz. dxz czy m=224 TL+2, de 2 m=0 *n increases. General reclius_thereases * l angular nedes Incll radiel nocles ancltotal nodes. *1 0 yenilm) vanishes for all except scortatals  Electron Spin Mg=ts Spin quantion number
CHEM 20A 2018 ALL STUDY GUIDE
MIDTERM TWO.
5.2 Shell Model for Many Election Atoms
* Hartree Orbitals
selfconsistent field orloral approxi. nethocles Assumptions : effective field Lonly depeneks on r
z r is the only coordinate
3. field is symmetric ( sphertent). Satom= 42102:4842) GOLD z orbital approximsectibl.am * Sizes and Shapes of Hartrees orbital.
Shell: all electrons with the same calue of an
Subshell = elections with the same value of in and la
Determine Periodic Table & Formation of Chemical Bond *Shietcling Effecùs Eviergy Seguerte of Hartree Orbituds.
. no degeneration X & zp have different energy
Vet (r) ñ  cet effective nuclear charge. EnxRuelberes)
_
nucleus.
 Shielding constant
t15)225201638,3pteach(484pH4clitat Shielding: sumet = +0:34 + Shett +0.854_n2 Shetty7.0075
He (18) shielding =0.31. exception because close to
Ens<Enp Send 5.3. Afabout Potaple for Electron Emfiguredden.
Le Parculi exclusion Principles
no bwo electrons have the same set of quantum numbers
 all different
Chak Mems). 2. Hunets Rule
Parachel spins is the lowest energy First enter each orbitals 1 1 1 then fill 11 11 11.
1870
.
A
.
B
energy to hig
E68 op
27 # Co3t henlohe JAN 2018
hower
* Building up. Atoms
follow the arrow fill from lower 28
energy to higher energy levels. 1848.40 Sp Ess se sa se Exceptions: 24C) [Ar]3d As'
29Cut? [Ar]3d1443')  tesave election with Cat chidn't fiu
full or half full
lover energy 5.4 ShelloR Peritoare Table Photoelectron Spectroscopy
 photoelection Spectaneter
measuring the energy
of the election after
Tonizatiba_cle) If Detector E= hu meve election extraction plates
Tonization reclciton kinetic energy energy energy.
Ita=Ex "Koopmen 3. Approximation":
__'lonization energy_is_the
negative of Hartree → KELOV) orbital energy
I ho
Eam 22m02_2
Ezo
t
 Enit
l
tonizationenergy13 theenergyrequiréel to remare an é from the
atom."
CHEM ZOA 2018 FALL MIDTERMI
STUDY GUIDE
5.5 Periodic Properties & Electronic Structure
*. Atomic Reclus : inverse to attraction (elecimen. eneryy:
Same period ( the changes) Atomic Radlins to Because of increase in Nucleus Charge Same Grong Chuge changes.)
 Aromic Because of accling new shell 7 Radius f (Shielding Effect). ons Effect of Group > Pertal eq. u ostat EX+1<x<(x1) Because of Sume elecimens
Radous c hifferent nuckles chemies
*lonization Energy
Laseening
 period
Groupe descending
EP
A Be
a BCN
Na
13
*Electron
EA=oE in exig Xigte]. same trend with the shifoing leave won't lower Turectomico
but
 humber Xcas fore
Figo Figit
 book FandNe have
> ID électroms
bor basically equals to Notte
CHAPTER 6 QUANTUM MECHANICS S MOLECULAR STRUCTURE
61 Quantum Picture of the Chemical Bronid
 Do and De are book  * _clissociation energy
Only Do Do measurable
the experiment Det
to represents zero privat
energy, lowest collow  fruttating value  equilibeiten bracel forreth 
Includes four parts (a e ě replitsion
(b) $ repulsiera to é o attraction
(do KE of ē interviucteur distance
11
large separation no interaction no interaction
construitive
equitorium
interference begins bond length * probabilion density diagram Hz.
for Born  Oppenheimer Approsinaiton nuclei fixed Solve Schrödinger's Equation move closer potermol energy togethelstellect solve anothered (Assumption  Mass of Proton (Nuclear) >> Mass of electrols)
CHEM 20A 2018 FALL MIDTERMII
STUDY GUIDE 6.2 Exaat Moecutor onbrials for the simplestNolecules that
Wave functions
Het EFA, FB. (4) PAB)
As graphic forms.  Molecular abitals log Itu zou 16th lg 28g
h a nadal plane 1/2,3.. energy level o Odī....6: Cylindrical symmetry Tu nalal plane contain
No anguteur momentum
 l intervinclear ans.
norzio angutana komentum  udg g x y z y 3) (4 = 4 Gerade"
u (xy s exy 3 4 = 4 lungeracle's
site sian
ale ng
opposite sign
I same sign
AH
reflect.
reflect * Ncave of Chemical Boncl. in Hat
eva

Antiboriding orbital
corresponding
ao
log — bonding abitat
CHAPTER 4. Introduction To QUANTUM MESHANICS.
4.1. Preliminasies  Wewe Motibasmanel Light
1 * Wave Amplitude As.
wale (A).
ling e Speed Fin
distance
time
*WARE LENGTH Time for a perial hx.t)ho = Accosztix/a  zlit/a) *Electromagnevio Radication  En
Eixos=Emar (cosizzly1D037)
c=27=2.997810 m/s same for all EM haves
electric field
A
hagnetto
field
X Spectrum
10
.
tetéti

1orm on in soon Zoon 10 V srays Xrays UV Visble
&
IR Microwave. frequency r
Rachio Example
microwave ovens use a frequenen 2.4.5x10°Hz What is the wavelength
 3.00x108 m/s 8 2.45X 10842
.
0,122m Interference and Oiffraction
Two waves pass through some region superposition of thos constructive inference: A
doutakel intens destructive interference: L y
canceled out Constructive interfers intensity position 2 clestiructive interference diffraction
intension
C
PA
ence.
no lights
destructive interference.
right of
constructive
interference
.
_.4.2Evidence for Energy Quantization in Atoms
*Lutherforet's Pametany Model doesn't holich Because = election is accelerating
o it must emit EM wave e  it will lose energy and spiral into nucleus.
So Quantized energy may help. * Max Planck anel Blackbody Radiation  emits energy from its surface in EM waves.
EM ware's wardlength clistribution depends on temperature.
 Classical As Temperature ? Hintensitattu
< Expertvustot taxitam fceltonton frequensa 70ook soook leg. light bulb=heated
redwhite). wavelength
racliation Bottzimento
intensity fulls to Zero at extretuely high .
→ Actually linionsistent with experimen intensity at frequency
Planck. Argumen  high toscattators are excited in different hope Frest Step: It is not possible to pass art with a comowane eft energy
This an oscillator of frequencydo.  energy, in quanta" of huagnituele ho.
Total E. Eose = nho n = 12,3,4... Chaenergy x time)
Tdifferent stars color)
constant
PALDIESERT
V
I
Ear
Classical
Shot
T he Planck's
 ot Second Step Radiation intensity curves
. fall out of intensity diminish probabilion
3 hilket h: Planck constanti ASTA PROD
 stets probability (Boltzmann dest.) (Clt hv/kg F1 (elt holes TF02
e s =he emit energy from being in TDEA: UJEnergy is discrete zj osoittator Takes discrete 3 temperature rust thing that
8th
of exciting osc.
kre
This
* Atomic Speutta
Spectrograph
for hydreagen, 7=(x722x3,29x108 N = 3,4,5, ..., Lit proves the atoms emit anul trecerea discrete
See speuren.
7 . Bohr's hypothes
aboorte
Explanation: Eitho=Ef. E=ho absorption. E
 Ei=Ef tho. emission. of ho t
 Grommet * FranckHertz Experiment and Energy Levels of Atom  known.energy elections collide with crans  Votoupl receiving a current at Places tonos Absorb Energus
e
correct. Im
Hacelerator
Uto  VEupperElowe
rolight light emitral by
Atom absorts energy to discrete Queittizzet extrauto,