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Chapter 12 Chemical Bonding. Chapter 12 Table of Contents 12.1 Types of Chemical Bonds (see Part 1) 12.2 Electronegativity (see Part 1) 12.3 Bond Polarity.

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Presentation on theme: "Chapter 12 Chemical Bonding. Chapter 12 Table of Contents 12.1 Types of Chemical Bonds (see Part 1) 12.2 Electronegativity (see Part 1) 12.3 Bond Polarity."— Presentation transcript:

1 Chapter 12 Chemical Bonding

2 Chapter 12 Table of Contents 12.1 Types of Chemical Bonds (see Part 1) 12.2 Electronegativity (see Part 1) 12.3 Bond Polarity and Dipole Moments (see Part 1) 12.4 Stable Electron Configurations and Charges on Ions (see Part 1) 12.5 Ionic Bonding and Structures of Ionic Compounds (see Part 1) 12.6Lewis Structures (see Part 1) 12.7Lewis Structures of Molecules with Multiple Bonds (see Part 1) 12.8Molecular Structure (see Part 1) 12.9Molecular Structure: The VSEPR Model 12.10Molecular Structure: Molecules with Double Bonds

3 Section 12.9 Molecular Structure: The VSEPR Model Return to TOC Copyright © Cengage Learning. All rights reserved 3 VSEPR Model VSEPR: Valence Shell Electron-Pair Repulsion. The structure around a given atom is determined principally by minimizing electron pair repulsions.

4 Section 12.9 Molecular Structure: The VSEPR Model Return to TOC Copyright © Cengage Learning. All rights reserved 4 Two Pairs of Electrons BeCl 2 180° Linear

5 Section 12.9 Molecular Structure: The VSEPR Model Return to TOC Copyright © Cengage Learning. All rights reserved 5 Three Pairs of Electrons BF 3 120° Trigonal planar

6 Section 12.9 Molecular Structure: The VSEPR Model Return to TOC Copyright © Cengage Learning. All rights reserved 6 Four Pairs of Electrons CH 4 109.5° Tetrahedral

7 Section 12.9 Molecular Structure: The VSEPR Model Return to TOC Copyright © Cengage Learning. All rights reserved 7 Steps for Predicting Molecular Structure Using the VSEPR Model 1.Draw the Lewis structure for the molecule. 2.Count the electron pairs and arrange them in the way that minimizes repulsion (put the pairs as far apart as possible). 3.Determine the positions of the atoms from the way electron pairs are shared (how electrons are shared between the central atom and surrounding atoms). 4.Determine the name of the molecular structure from positions of the atoms.

8 Section 12.9 Molecular Structure: The VSEPR Model Return to TOC Copyright © Cengage Learning. All rights reserved 8 Arrangements of Electron Pairs and the Resulting Molecular Structures for Two, Three, and Four Electron Pairs

9 Section 12.10 Molecular Structure: Molecules with Double Bonds Return to TOC Copyright © Cengage Learning. All rights reserved 9 Molecules with Double Bonds When using the VSEPR model to predict the molecular geometry of a molecule, a double or triple bond is counted the same as a single electron pair.  CO 2

10 Section 12.10 Molecular Structure: Molecules with Double Bonds Return to TOC Copyright © Cengage Learning. All rights reserved 10 Concept Check Determine the molecular structure for each of the following molecules, and include bond angles: HCN PH 3 SeO 2 O3O3 HCN – linear, 180 o PH 3 – trigonal pyramid, 109.5 o (107 o ) SeO 2 – bent, 120 o O 3 – bent, 120 o

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