Unit 6 - Oct 25 2013 Chapter 6 Fundamentals of Chemical Bonding Section 6.1(Pages 258-263 Overview of Bonding The Hydrogen Molecule Bond Length and

Unit 6 - Oct 25 2013 Chapter 6 Fundamentals of Chemical...

This preview shows page 1 - 14 out of 93 pages.

Oct. 25, 2013 Chapter 6: Fundamentals of Chemical Bonding Section 6.1 (Pages 258-263): Overview of Bonding The Hydrogen Molecule Bond Length and Bond Energy Other Diatomic Molecules: F 2 Unequal Electron Sharing Electronegativity and Polar Covalent Bonds Suggested end-of-chapter exercises: 6.1, 6.2, 6.5, 6.8, 6.9, 6.10, 6.11
Image of page 1
Oct. 25, 2013 Chapter 6: Fundamentals of Chemical Bonding Section 6.2 (Pages 264-274): Lewis Structures The Conventions The Bonding Framework Building Lewis Structures Optimizing the Structure Beyond the Octet Resonance Structures Suggested end-of-chapter exercises: 6.15, 6.17, 6.19, 6.21, 6.23, 6.25, 6.27, 6.29
Image of page 2
Lewis Theory: refers to a description of chemical bonding through Lewis symbols and Lewis structures in accordance with a particular set of rules. Based on the observed “inertness” of noble gases, and the idea that atoms of other elements combine to acquire noble gas electron configuration Lewis Theory: An Overview Gilbert Newton Lewis (1875 1946) Alpha Chi Sigma Educational Foundation:
Image of page 3
Lewis Theory Fundamentals: Valence shell electrons play an important role in chemical bonding Electrons are transferred or shared between two atoms in a way that both atoms acquire a stable electron configuration. This configuration is normally consistent with noble gas configuration with an octet (eight) outer-shell electrons. Bonds can be: Ionic Covalent Lewis Theory: An Overview
Image of page 4
Octet: refers to eight electrons in the outer-most (valence) electronic shell of an atom or in a Lewis structure. Lewis Symbol: represents the valence electrons of an element by dots placed around the chemical symbol of the element. Lewis Theory: An Overview N •• P •• As •• Sb •• Bi •• •• Al Se •• Ar •• •• •• I •• •• ••
Image of page 5
Problem: Write Lewis symbols for: (a) Mg (b) K (c) Br - (d) S 2- Lewis Theory: An Overview
Image of page 6
Ionic bond: results from the transfer of electrons between metal and nonmetal atoms. Positive and negative ions are formed and held together by electrostatic attractions. Lewis Theory: An Overview
Image of page 7
Lewis Structure: combination of Lewis symbols that depicts the transfer or sharing of electrons in a chemical bond. Lewis Theory: An Overview Lewis symbols Lewis structure
Image of page 8
Lewis symbols for ionic compounds Lewis Theory: An Overview Ba O •• •• •• O •• •• •• Ba 2+ 2- Mg Cl •• •• •• Cl •• •• •• •• Cl •• •• •• Mg 2+ - 2 BaO MgCl 2
Image of page 9
Lewis Theory: An Overview Problem: Write Lewis structures for the following ionic compounds: (a) Al 2 O 3 (b) Na 2 S (c) Li 2 O
Image of page 10
Covalent bonds: are formed when electrons are shared between a pair of atoms. Lewis Theory: An Overview
Image of page 11
Covalent bonds: are formed when electrons are shared between a pair of atoms. Lewis Theory: An Overview
Image of page 12