1058-Ho3-RG1-10 - Chem 1058 J. Walcott LEARNING STRATEGIES...

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Chem 1058 Handout #3 J. Walcott LEARNING STRATEGIES CENTER Spring 2010 Review Guide #1 Lectures: 1/25/10 – 1/29/10 Chapter 14 I. Resonance A. Resonance structures show the delocalizatiion of electrons, which are represented by the curved- arrow formalism, without moving atoms. Resonance structures are usually placed in brackets and are used to describe a single molecule. The real molecule is the weighted average of its resonance structures. B. Generally, the molecule with the greater number of resonance structures is more stable. C. The following guidelines can be used to evaluate the relative importance of resonance structures: 1. Identical structures are equally important descriptions of a molecule. 2. Structures with the greater number of bonds are more important. 3. Structures requiring the separation of opposite charges are less important than those that do not. 4. Structures in which charges and/or electron deficiency are assigned to atoms of appropriate electronegativity are more important. 5. Resonance structures with a noble gas configuration are more important than those that do not have a noble gas configuration. II.
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1058-Ho3-RG1-10 - Chem 1058 J. Walcott LEARNING STRATEGIES...

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