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Pi bond

AP Chemistry Zumdahl 7E Chapter 9 Notes

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1 Chapter 9 - Covalent Bonding: Orbitals 9.1 Hybridization and the Localized Electron Model A. Hybridization 1. The mixing of two or more atomic orbitals of similar energies on the same atom to produce new orbitals of equal energies B. Hybrid Orbitals 1. Orbitals of equal energy produced by the combination of two or more orbitals on the same atom C. Evidence for hybridization of carbon - Methane and sp3 1. Four bonds of equal length and strength Carbon's isolated configuration Carbon's hybridized configuration 2. Four effective pairs of electrons surround the carbon 3. "Whenever a set of equivalent tetrahedral atomic orbitals is required by an atom, this model assumes that the atom adopts a set of sp3 orbitals; the atom becomes hybridized"

Principles of Chemistry Chapter 7

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Chapter 7: Chemical Bonding Section 7.3: The Covalent Bond Wednesday, October 1, 2014 1:55 PM Covalent bonds - attractive force resulting from the sharing of electrons between pairs of atoms ? Chemical Bonds and Energy ? Driving force between all bond formation is lowering overall energy (NOTE: attractive interactions lower potential energy) ? Typically in interactions between nonmetals! ? -point of minimum energy in a system = formation of covalent bond Bond energy - energy released when isolated atoms form a covalent bond Bond length - distance between the nuclei of bonded atoms ? Formation of a chemical bond always releases energy Bond strength is determined by the amount of energy released in the formation of that bond (more released energy means stronger bond) ?

Organic Chapter 2 ppt

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Chapter 2 Structure and Properties of Organic Molecules Organic Chemistry, 6th Edition L. G. Wade, Jr. Chapter 2 * Sigma Bonding Electron density lies between the nuclei. A bond may be formed by s-s, p-p, s-p, or hybridized orbital overlaps. => Chapter 2 Chapter 2 * Pi Bonding Pi bonds form after sigma bonds. Sideways overlap of parallel p orbitals. => Chapter 2 Chapter 2 * Multiple Bonds A double bond (2 pairs of shared electrons) consists of a sigma bond and a pi bond. A triple bond (3 pairs of shared electrons) consists of a sigma bond and two pi bonds. => Chapter 2 Chapter 2 * Molecular Shapes Bond angles cannot be explained with simple s and p orbitals. Use VSEPR theory.

Bob Jones PPT Notes -- Chapter 7a

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Bond Theories 1 Lewis Structures Tell us about bonds in a molecule Do not tell us about the shape of the molecule Valence Bond Theory Based on the quantum model Says that covalent bonds form when orbitals of different atoms overlap sigma (?) ? the ends of the orbitals overlap pi (?) ? the sides of the orbitals overlap Types When Orbitals Overlap Bonds: sigma bond Single Bond s sublevel 5 Chemistry textbook, p. 162 sigma bond Single Bond p sublevel 6 Chemistry textbook, p. 162 Which type of bond forms first between covalently bonded atoms? Sigma Pi Depends on the atom Question 7 sigma and pi bond Double Bond 8 Chemistry textbook, p. 162 sigma and 2 pi bonds Triple Bond 9 Chemistry textbook, p. 162 pi bond forms only after a sigma bond weaker than a sigma bond double bond
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