Chapter 8: Prediction of Molecular Geometry (VSEPR)

Slides:

Advertisements

Similar presentations

Copyright McGraw-Hill Chapter 9 Chemical Bonding II: Molecular Geometry and Bonding Theories.

Advertisements

Molecular Shape VSEPR (Valence Shell Electron Pair Repulsion) Theory.

X. VSEPR Theory – Valence Shell Electron Pair Repulsion theory. [Remember: Like charges repel!] Valence Shell Electron Pair Repulsion theory. [Remember:

Basic Chemistry Copyright © 2011 Pearson Education, Inc. 1 Chapter 10 Structures of Solids and Liquids 10.2 Shapes of Molecules and Ions (VSEPR Theory)

Molecular shapes Balls and sticks. Learning objectives  Apply VSEPR to predict electronic geometry and shapes of simple molecules.

Chapter 9 Molecular Geometry and Bonding Theories.

Molecular Shapes Chapter 6 Section 3. Molecular Structure It mean the 3-D arrangement of atoms in a molecule Lewis dot structures show how atoms are bonded.

VSEPR Valence Shell Electron Pair Repulsion Theory Predicting Molecular geometry or molecular shapes.

Trigonal Bipyramidal Electronic Geometry: AB5, AB4U, AB3U2, and AB2U3

Carvone Bucky ball Molecular Geometry Chapter 8 Part 2.

VSEPR Theory Valence Shell Electron Pair Repulsion.

Lewis Symbols and the Octet Rule Electron Dot Symbols convenient way of showing the valence electrons of atoms. Consists of the chemical symbol and one.

Molecular Geometry. 2-D and 3-D Lewis Structures explain the two dimensional structure of molecules In order to model the actual structure of a molecule.

Cornell Notes (Section 8.4, especially page 263  Topic: Molecular Geometry  Date: 2/7/2012  VSEPR = Valence Shell Electron Pair Repulsion  Valence.

Chemistry Chapter 9 Notes #3. Representing Molecules Molecular Formula –Ex. CH 4 –Ex. H 2 O Structural/ Lewis Formula Ball & Stick Model Space Filling.

Molecular Shapes Chapter 6 Section 3. Lewis dot structures show how atoms are bonded together, but they often do not illustrate the true shape of a molecule.

Section 8.13 Molecular Structure: The VSEPR Model VSEPR: Valence Shell Electron-Pair Repulsion. ▪Used to predict a 3-dimensional shape of a molecule ▪Based.

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.

VSEPR Theory Valence Shell Electron Pair Repulsion.

Molecular Geometry and VSEPR Theory

Objectives for Bonding and Periodicity (2)

Sahara Williams.

Molecular Geometry and Bonding Theories.

Molecular Geometry VSEPR.

Chapter 8 Covalent Bonding 8.3 Bonding Theories

VSEPR and Molecular Geometry

TOPIC: Molecular Geometry (Shapes of Molecules) Essential Question: How do you determine the different shapes of molecules?

Timberlake LecturePLUS

ValenceShellElectronPairRepulsion

Molecular Geometries and Bonding Theories

Ch. 6 – Molecular Structure

Molecular Geometry bond length, angle determined experimentally

Valence Shell Electron Pair

MOLECULAR GEOMETRY Topic # 18

Valence Shell Electron Pair Repulsion Theory (VSEPR)

Bellwork Monday Draw the following Lewis dot structures. CCl4 NH4+

Valence Shell Electron Pair Repulsion

MOLECULAR GEOMETRY Bonding Unit.

II. Molecular Geometry (p. 183 – 187)

CHEMISTRY 161 Chapter 10 Chemical Bonding II

Molecular Geometry VSEPR and beyond!.

The VSEPR Theory Section 4.3.

Chapter 6 – 3 Molecular Geometry (p. 214 – 218)

O = O V___________ S________ E________ P______ R____________

Ch. 6 – Molecular Structure

Molecular Structure Molecular Geometry.

GEOMETRY AND POLARITY OF MOLECULES

Chapter 8 Covalent Bonding 8.3 Bonding Theories

Chapter 10 Molecular Structure: Solids and Liquids

Molecular Shapes: True shapes of molecules

Chapter 8 Covalent Bonding 8.3 Bonding Theories

Molecular Geometry bond length, angle determined experimentally

Valence Shell Electron Pair Repulsion

Chapter 10 Properties of Solids and Liquids

Molecular shapes.

Molecular Structure II. Molecular Geometry.

Molecular Geometry bond length, angle determined experimentally

Molecular Geometry bond length, angle determined experimentally

II. Molecular Geometry (p. 183 – 187)

Valence Shell electron pair repulsion model 3D models

Molecular Shapes It mean the 3-D arrangement of atoms in a molecule

Molecular Shapes VSEPR Model

Molecular Shapes Mrs. Chan.

Molecular Geometry.

6.5 VSEPR Theory and Molecular Shapes

Valence Shell Electron Pair Repulsion

II. Molecular Geometry (p. 183 – 187)

II. Molecular Geometry (p. 183 – 187)

Presentation transcript:

Chapter 8: Prediction of Molecular Geometry (VSEPR) Chapter 5: Covalent Bonds and Molecular Structure 2/17/2019 Chapter 8: Prediction of Molecular Geometry (VSEPR) Copyright © 2010 Pearson Prentice Hall, Inc.

Molecular Shapes: The VSEPR Model Chapter 5: Covalent Bonds and Molecular Structure 2/17/2019 Molecular Shapes: The VSEPR Model VSEPR: Valence-Shell Electron-Pair Repulsion model - Electrons in bonds and in lone pairs can be thought of as “charge clouds” that repel one another and stay as far apart as possible, this causing molecules to assume specific shapes. Copyright © 2010 Pearson Prentice Hall, Inc.

Linear molecules: Two Charge Clouds Chapter 5: Covalent Bonds and Molecular Structure 2/17/2019 Linear molecules: Two Charge Clouds The CO2 molecule Geometry- linear - Central atom (C) binds to two other atoms The HCN molecule Geometry- linear - Central atom (C) binds to two other atoms Copyright © 2010 Pearson Prentice Hall, Inc.

Planar molecules: Three Charge Clouds Chapter 5: Covalent Bonds and Molecular Structure 2/17/2019 Planar molecules: Three Charge Clouds The H2CO molecule Geometry- Trigonal Planar - Central atom (C) binds to three other atoms The SO2 molecule Geometry- Bent - Central atom (S) binds to two other atoms with one lone pair Copyright © 2010 Pearson Prentice Hall, Inc. 4

Tetrahedral Molecules: Four Charge Clouds Chapter 5: Covalent Bonds and Molecular Structure 2/17/2019 Tetrahedral Molecules: Four Charge Clouds Copyright © 2010 Pearson Prentice Hall, Inc.

Chapter 5: Covalent Bonds and Molecular Structure Tetrahedral Molecules: Four Charge Clouds 2/17/2019 Copyright © 2010 Pearson Prentice Hall, Inc.

Bipyrimidal molecules: Five Charge Clouds Chapter 5: Covalent Bonds and Molecular Structure 2/17/2019 Bipyrimidal molecules: Five Charge Clouds Copyright © 2010 Pearson Prentice Hall, Inc.

Trigonal Bipyrimidal structure Structure of PCl5 PCl5 forms a trigonal bipyrimidal shape

Electron pairs within this shape generally occupy the equatorial positions

Electron-Dot Structures of Polyatomic Molecules Chapter 5: Covalent Bonds and Molecular Structure 2/17/2019 Electron-Dot Structures of Polyatomic Molecules Draw an electron-dot structure for SF4. Step 1: 6 + 4(7) = 34 valence electrons S F S F Step 3: Step 2: Step 2: The central atom is in row 3 so there can be more than 8 electrons. Step 4: There are no remaining electrons. Step 5: The central atom has at least 8 electrons so no multiple bonding. S F Step 4: Copyright © 2010 Pearson Prentice Hall, Inc.

The geometry of sulfur tetraflouride (SF4) is a seesaw

Look at the geometry of CLI3

The geometry of I3

Octahedral molecules: Six Charge Clouds Chapter 5: Covalent Bonds and Molecular Structure 2/17/2019 Octahedral molecules: Six Charge Clouds Copyright © 2010 Pearson Prentice Hall, Inc.

Electron pairs first occupy the axial positions before the equatorial positions

Chapter 5: Covalent Bonds and Molecular Structure 2/17/2019 Copyright © 2010 Pearson Prentice Hall, Inc.

Chapter 5: Covalent Bonds and Molecular Structure 2/17/2019 Copyright © 2010 Pearson Prentice Hall, Inc.

Chapter 5: Covalent Bonds and Molecular Structure 2/17/2019 Copyright © 2010 Pearson Prentice Hall, Inc. 18

Electronegativity and the periodic table Chapter 5: Covalent Bonds and Molecular Structure 2/17/2019 Electronegativity and the periodic table Copyright © 2010 Pearson Prentice Hall, Inc.