chapter_1_introduction_and_review

chapter_1_introduction_and_review - Chapter 1 Introduction...

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Unformatted text preview: Chapter 1 Introduction and Review h Concept to review : It is your responsibility to review the following concepts before the first class to ensure success in understanding new concepts: Atomic structure (1-2) 2 Bond formation: octet rule (1-3) Lewis structure (1-4) Multiple bonds (1-5) Electronegativity and bond polarity (1-6) Formal charges (1-7) h Resonance (1-9) Sometimes the structure of a compound cannot be represented by a single Lewis structure. In this case, more than one structure is used. The actual structure of the compound is somewhere between the resonance forms and is called the resonance hybrid. 3 C + N H H H H C N + H H H H = C N H H H H resonance forms of a resonance hybrid resonance hybrid combined representation h For example, when acetic acid is deprotonated by a base, a carboxylate anion is formed for which 2 resonance forms can be drawn. h Remember that in resonance hybrid, only electrons can move, not atoms 4 h Rules: Individual resonance forms are imaginary. Resonance forms differ only in the placement of their or non bonding 5 placement of their or non-bonding electrons. (see example of the carboxylate anion). Resonance forms of a compound do not have to be equivalent Example: acetone anion 6 b Resonance forms must be valid Lewis structures and obey the normal rules of valency. Example: Acetate anion O O O- O 7 H 3 C O H HO- H 3 C O- H 3 C O H 3 C O _ not a valid Lewis Structure The resonance hybrid is more stable than any individual resonance form, ie , resonance leads to stability....
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This note was uploaded on 08/10/2011 for the course CHEM 203 taught by Professor Guyplourde during the Spring '11 term at UNBC.

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chapter_1_introduction_and_review - Chapter 1 Introduction...

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