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The Ties That Bind Chemical Bonding and Interactions.

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Presentation on theme: "The Ties That Bind Chemical Bonding and Interactions."— Presentation transcript:

1 The Ties That Bind Chemical Bonding and Interactions

2 1. Stable Electron Configurations 2. Electron-Dot (Lewis) Structures 1. Drawing, Rules for Drawing 2. The Octet Rule 3. Some Exceptions to the Rule 3. Ionic Bonding 1. Naming ionic compounds 2. Drawing 4. Covalent Bonding 1. Naming covalent compounds 2. Drawing 3. Electronegativity and Polar Covalent Compounds 5. Molecular Shapes and the VSEPR Theory 6. Intermolecular Forces of Attraction 1. H-bonds, Dipole-Dipole, Ion-Dipole, London Dispersion Forces

3 MOLECULAR GEOMETRY

4 The VSEPR Model Predicting Molecular Geometries

5 Cl Be 2 atoms bonded to central atom 0 lone pairs on central atom 10.1

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7 The VSEPR Model Predicting Molecular Geometries

8 10.1

9 bonding-pair vs. bonding pair repulsion lone-pair vs. lone pair repulsion lone-pair vs. bonding pair repulsion >>

10 The VSEPR Model Molecules with Expanded Valence Shells

11 The VSEPR Model Molecules with Expanded Valence Shells To minimize e e repulsion, lone pairs are always placed in equatorial positions.

12 The VSEPR Model Molecules with Expanded Valence Shells

13 10.1

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16 The VSEPR Model

17 Molecules with More than One Central Atom In acetic acid, CH 3 COOH, there are three central atoms. We assign the geometry about each central atom separately.

18 Predicting Molecular Geometry 1.Draw Lewis structure for molecule. 2.Count number of lone pairs on the central atom and number of atoms bonded to the central atom. 3.Use VSEPR to predict the geometry of the molecule. What are the molecular geometries of SO 2 and SF 4 ? SO O AB 2 E bent S F F F F AB 4 E distorted tetrahedron 10.1

19 The VSEPR Model Predicting Molecular Geometries To determine the electron pair geometry: draw the Lewis structure; count the total number of electron pairs around the central atom. arrange the electron pairs in one of the above geometries to minimize e -e repulsion. multiple bounds count as one bonding pair.


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