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Sigma 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"

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.

Chapter 10

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Chemistry 1210: Introduction to General Chemistry Dr. Gina M. Florio 26 Nov. 2012 Jespersen, Hyslop, & Brady Chapter 10 Chemical Bonding & Molecular Structure VSEPR Theory Valence Shell Electron Pair Repulsion (VSEPR) Model: 1. e- pairs repel each other 2. e- pairs position themselves in 3D to minimize repulsion Molecules have well defined shapes based on their electronic structure. Molecular Structure: Shapes of molecules The shapes of molecules are derived from 5 different geometric structures that are classified by number of electron domains contained around the central atom. Two types of electron domains: Bonding domains (e- pairs in bonds) Nonbonding domains (e- pairs associated with a single atom)

Bob Jones PPT Notes -- Chapter 7b

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Molecular Geometry 1 Valence Shell Electron Pair Repulsion (VSEPR) Theory Electron concentrations are arranged so as to be at maximum distance. Why? Electrons repel each other. Number of Electron Concentrations H H H H C ? ? ? ? Ex: CH4 O F F C ? ? ? ? Ex: CF2O Number of Electron Concentrations all 4 bonded = tetrahedral Ex: CH4 H H H H C ? ? ? ? 4 Regions of e? Conc. 5 Chemistry textbook, p. 169 3 bonded = pyramidal Ex: NH3 H H H N ? ? ? 4 Regions of e? Conc. 6 Chemistry textbook, p. 167 2 bonded = bent 104.5? Ex: H2O H H O ? ? 4 Regions of e? Conc. 7 Chemistry textbook, p. 170 1 bonded = linear Ex: HF H F ? 4 Regions of e? Conc. 8 Chemistry textbook, p. 170 All 3 bonded = trigonal planar 2 bonded = bent 120? Ex: BI3 Ex: GeF2 1 bonded = linear Ex: SO 3 Regions of e? Conc.

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

Bob Jones PPT Notes -- Chapter 6a

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Basics of Bonding 1 The second law of thermodynamics tells us that things tend to lose energy. Balls roll downhill. Electrons return to ground state. Atoms link or bond to each other. 2 Atoms bond because they Lose energy Gain stability 3 Energy/stability Unbonded Bonded 4 BJU Press Chemistry textbook p. 140 Noble gases (8 outer e?) are the most stable elements. Elements gain, lose, or share electrons to attain the ?noble-gas electron configuration.? This is called the octet rule. 5 Ionic: Metals/nonmetals Covalent: Nonmetals/nonmetals Metallic: Metals/metals Types of Bonds A property affecting ionic and covalent bonds The tendency of objects to have regions of opposite charge Polarity Examples: N and S poles (+) and (?) ends of a battery polar bond
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