1. Determine all possible resonance structures of sulfite. 2 ......2019/09/10 · Review 1....
Transcript of 1. Determine all possible resonance structures of sulfite. 2 ......2019/09/10 · Review 1....
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Review1. Determine all possible resonance structures of sulfite.2. Calculate the bond order for s-o. 3. Is there a specific Lewis model that best represents the ion? Use formal charge to support your answer.
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241-2=26 [email protected]:÷÷÷÷÷÷÷¥f±¥÷÷÷¥÷÷:*
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Bo of S- O = 4 bondsTatom
- 1541.5J
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VSEPR&Model&
• “Valence(Shell(Electron(Pair(Repulsion”(• Basic(molecular(structure,(builds(upon(Lewis(Model(
• Attempts(to(account(for(3D(structures(! (e.g(tetrahedral,(seesaw,(octahedral(
• 3D(structures(allow(more(accurate(prediction(of(polarity((remember(how?)(
• Not(a(quantum(model((no(mention(of(s,(p,(d,(f(orbitals)(
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Solution(Chemistry(Notes(
( 6(
((((((
( ( ( (
((((((
( ( ( (
((((((
( ( ( (
((((((
( ( ( (
((((((
( ( ( (
(((Write(Lewis(diagram(first.(Then(using(the(VSEPR,(make(a(modification(to(the(structure(to(accurately(represent(the(shape.(1. H2O(2. CH4(
3. CO2(4. NH3(
5. CH3OH( 6. BeCl2((Be(eT(def.)(
7. CH3OCH3(8. C6H6(
((((
2 Bonds
←#*#-o ⇐ a
linear
2 Bonds 3 Bond1 LP ' O
*¥**o ⇐ 3bent trigonal planar
2B - 4 Bondsup r EEP !; !! Ol ⇐ 4#***o oy***oO O axialbent trigonal pyramid tetrahedral
313 413 5- Bonds OO 240 0 up
g I # equatorial""÷÷¥*¥÷: :÷÷÷*¥¥T ÷: #**Eo⇐slinear T- shape seesaw bi pyramidal
2B 313 413 b-Bonds 6 Bonds4LP - - 3. LP 24
'
i! ?;ILP O
÷÷÷i¥÷o÷*i: ¥!¥**÷I←*¥*⇒⇐6o remove ← fo...
' axial Olinear T- shape square planar square pyramid octahedral
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VSEPR&Review&
• Draw(VSEPR(model(for(each.(Determine(the(molecular(geometry,(electron(geometry,(shape(name,(bond(angle(and(dipole(moment.(! CH4((! NH3(! CO2(! SF4(! CH2O(! ICl5(
H109.50
{ CH4 4+443=8 it It → Hshape w/o LP ⇐ MG =
tetrahedraShape includes ⇐ EG
= tetrahedraltells
LP bond 4H ooo oooNHS 5th -33=8 ply ; → s
"HE
Mq= D pyramid y - HII LEG - tetrahedralHHstsh.tt#tells bond 4
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:O :CO2
, [email protected] . Sp ②CO2 4+(2-6)=16 : CFE tf 'H
16-4=12 f4 ¢ 0
E. =c÷o:"Eugene
MG - ECT S sp to checkLinear
<VSEPR
Bond 4
Np
'°O°. §?:{
"dedok
IF F:o o X o / o '
SFA 6h47) - 34 0⑥ o.O34-8=26 g. E - ¥ .
•0
26-(4-6)=2 ↳ VSEPR4bonds ILP
Iv
MG - seesaw :¥: SpdECT - O bipyramid
: Hey 900Bond 4=12004900
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go
polar - ° ; II. ¥1200I Cl :÷.CI-Cl
Cl lCl
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Quiz&1&&
• Drawing(Lewis(diagram(• Choosing(the(correct(Lewis(diagram(based(on(FC(• Drawing(VSEPR,(name(of(shape,(bond(angle,(dipole(moment,(polarity,(and(partial(charges(
on Thursday
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AP(Chemistry(12(
Bonding((
Valence(Bond(Theory(
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Valence&Bond&Theory&
• Attempts(to(explain(molecular(structure(based(on(quantum(model(• Results'are'very'similar'to'VSEPR'Model,'and'in'most'cases,'VBT'is'not'needed'to'explain'anything'extra'• Having(said(that,(the(most(important(contribution(from(VBT(is(hybridisation(
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Valence&Bond&Theory&• Recall(that(sVorbital(electrons(and(pVorbital(electrons(have(different(energy(levels((so(do(dVorbital(electrons)(! (For(example,(when(we(write(the(electron(conWiguration(for(C,(we(write(1s22s22p2(
! (The(valence(electrons(in(C(are(the(2s22p2(electrons((4(valence(electrons)(
HpH -&-HpH
O2 2
✓
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In CH4 needs sp3x4H
C 15 252 ZPZ µIt -- Tt @DEEfE.H
H
sp ph¥ridH¥### spsspzSp3 It ←core = not used in
bonding
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Valence&Bond&Theory&• When(central(atoms(are(bonded,(however,(they(make(bonds(that(are(identical(to(nearby(atoms(• Problem:(How(can(electrons(of(different(energy(levels(form(bonds(of(identical(energy(level?(• Solution:'Hybridisation'
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Valence&Bond&Theory&
I go"
I 808 88
Hmissing
it-
H sp
spz p
c. sps x
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Valence&Bond&Theory&• Example:(CO2(
! (Carbon(needs(to(make(two'equal'bonds'with(oxygen(
{MG=FG= Linear
2-bonds• op • a d
Q.si#FCFr.Qspzp-71-zs22PZzs#I-1¥If#spx2
2 bonds 3.bonds 4 bonds b-bond
sp sp' Sps sp3d
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Hybridisa>on&in&CO2&Ibond
• a o o SigmaO = CFO
( = 152252 zp2° °
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T Et8 bond
⑧y①iI? 2x Zbsopndt b remaininghybrid used pxz
7L indouble2x bond H
Unbybridized lP- orbital t
sp HyobrrbiffiazedI = S bond
= IT bonds µ H