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Lecture April 8
1
Hour II this Thursday April 10:acid-base reactions,
oxidation-reduction (Chap. 4)Chap. 9 and 10
A bit more on MO Theory
Review
See Study Guide posted
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MO Diagram of a HeteronuclearDiatomic Molecule
2
See Figure p. 443
2p
2p
2s2s
!*2p
!2p
"2p
"*2p
!*2s
!2s
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Filling NO
3
2p
2p
2s2s
!*2p
!2p
"2p
"*2p
!*2s
!2s
No
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Filling the MO
4
2p
2p
2s2s
!*2p
!2p
"2p
"*2p
!*2s
!2s
BondOrder =
1/2 (6-1)
=2.5
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Study Guide - Chap. 4
5
Chapter 4:
•Write balanced chemical equations, and net ionic equations
for acid/base reactions.
•Know the common strong acids and bases given in Table
4.2
•Neutralization calculations with strong acids and bases
•Concentration of a base [OH-] from the solubility of a
compound or the concentration of the aqueous solution.
•Identify the oxidation numbers of elements in compounds,
oxidation-reduction reactions, the compound oxidized and
reduced and the oxidizing agent and reducing agent in a
reaction
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Oxidation-Reduction Review
6
Rules on p. 164Lead-Acid Battery
Pb(s) + PbO2(s) + 2 H2SO4(aq) !
2 PbSO4(s) + 2 H2O(l)
Pb 0 to +2
Pb +4 to +2
oxidation
reduction
Pb is the reducing agent
PbO2 is the oxidizing agent
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Acid-Base Reaction Review
7
Acid + base ! salt + H2O(l)
Only strong acids and bases - Table 4.2
HNO3(aq) + KOH(aq) ! KNO3(aq) + H2O(l)
Net ionic reaction:H+(aq) + OH-(aq) ! H2O(l)
Neutralization is when nacid = nbase
Remember: n = MV
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Chap. 9 and 10
8
•Write Lewis Dot Structures for atoms, ions, and molecules•Write resonance structures for molecules•Predict and name the valence shell electron orbital geometries ofcentral atoms in a molecule.
•Predict and name the molecular geometries, estimate bond angles.•Formal charge - use to select between possible structures•Predict the relative polarity of bonds and molecules•Give the orbital hybridization responsible for bonds to the central atom.•Identify sigma and pi bonds in molecules.•Structure of Benzene and other organic molecules (be able to identify
the hybridization of specific atoms in the structure.)•MO theory only for diatomic molecules and their ions (will be giventhe diagram to fill in.)
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Quiz of the Day
9
Assumingthis diagramis valid for
the NF
system, givethe bond
order. Use .5to designate
1/2
2p
2p
2s2s
!
*2p
!2p
"2p
"*2p
!*2s
!2s
Answer: 2.0
