chapter 8 second set of chapt. 8 homework dates extended until after break lab notes today’s...
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![Page 1: Chapter 8 Second set of Chapt. 8 homework dates extended until after break Lab Notes Today’s Topic: Bond Properties (Sec. 8.4- there is no 8.3!) Electron](https://reader035.vdocument.in/reader035/viewer/2022062702/56649d4d5503460f94a2c80c/html5/thumbnails/1.jpg)
•Chapter 8 •Second set of Chapt. 8 homework dates extended until after break•Lab Notes•Today’s Topic:
Bond Properties (Sec. 8.4- there is no 8.3!)
Electron Distribution in Molecules (8.5)
November 16, 2009
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What can we do with Lewis Structures?
Bond Properties
1. Polarity
2. Bond Order
3. Bond Length
4. Bond Energy
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Bond Energy= The energy required to separate two bonded atoms
Remember-
It ALWAYS takes energy to break a bond!
Making bonds releases energy.
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It ALWAYS requires energy to BREAK a bond!
The phosphate bond in ATP is not “broken”, it is hydrolyzed, a multi-faceted process that does result in a net release of energy. However, it involves more than the simple breaking of one bond.
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Bond Energy in Ionic Compounds: Lattice Energy
Energy to separate all the ions
NaCl(s) Na+(g) + Cl-(g) H = Lattice E = -790 kJ/mol
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Lattice Energy
Lattice energy = the energy it takes to pull ions in a solid apart
Remember Coulomb’s Law! Depends on ion SIZE Depends on ion CHARGE
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Which has the strongest lattice energy?
1 2 3 4
38%
21%
12%
30%
1. MgCl2. BaCl3. KCl4. CsCl
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Internal Properties of Molecules
ResonanceFormal ChargeOxidation NumberPartial Charge
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Resonance Structures
A resonance structure is when more than one arrangement of electrons is possible (i.e., there is more than one reasonable Lewis structure)
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Resonance and Bond Order
Bond order will not equal the # of bonds if there is more than one possible structure
What is the bond order of the C-O bond in the carbonate ion?
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What is the bond order in SO2?
1 2. 3. 4. 5. 6.
6% 6%
16%
5%
49%
17%
1. 12. 1.253. 1.334. 1.55. 1.676. 2.0
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