Lecture23_October212008 - Announcements October27 November3...

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Announcements Homework on Chapter 7 due Monday,  October 27 Homework on Chapter 8 due Monday  November 3 Chapter 7 “Chemical Bonding and  Molecular Structure”  finish on Friday Chapter 8 “Molecules and Materials” begin  on Friday
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Chapter 7:  Chemical Bonding and  Molecular Structure The Ionic Bond (7.2) Formation of Anions and Cations The Covalent Bond (7.3)  Energy, Reactions and Structure of Molecules Electronegativity and Bond Polarity (7.4) Lewis Structures (7.5) Orbital Overlap and Chemical Bonding (7.6) Hybrid Orbitals (7.7) Shapes of Molecules (7.8) Fluorine Compounds (7.9)
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   Covalent bonds:   formed by sharing pairs of          electrons   Length and strength of bond results form interplay of  attraction  between  opposite charges  and  repulsion   between  like charges Net attractive forces hold atoms together
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Figure 7.4
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Chemical Bonds and Energy When two atoms  approach one  another, the  negatively  charged electron  clouds are  attracted to the  other atom’s  positively charged  nucleus. Figure 7.5
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Bond Dissociation Energy Bond Dissociation Energy (D):  Amount of energy  required to break a chemical bond Value is positive because energy is required to  break a bond Bonds between similar atoms have similar  dissociation energies 
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Average Bond Dissociation Energies
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Chemical Bonds and  Reactions
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Chemical Bonds During  ionic bond formation , cations and  anions achieve  np 6  electronic  configurations (noble gas configuration).
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