The Shapes of Molecules  Most molecules are 3-Dimensional molecules.  Molecules are found to have certain shapes.  Example;  a pyramid, linear, planar.

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:

Drawing Lewis structures

SHAPES OF MOLECULES. REMINDER ABOUT ELECTRONS  Electrons have negative charges  Negative charges “repel” each other  In molecules, electrons want to.

Highland Science Department Molecule Shapes Why do these molecules have such different shapes?

Covalent Bonding– VSEPR Theory

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 Theory Valence Shell Electron Pair Repulsion.

Molecular Shape Section 9.4

Molecular Geometry VSEPR Theory.

Section 5.3—Molecules in 3D. Bonds repel each other Bonds are electrons. Electrons are negatively charged Negative charges repel other negative charges.

Molecular Geometry VSEPR and beyond!. Molecular Geometry Three dimensional arrangment of atoms Molecular polarity determined by geometry and polarity.

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.

Review Double and Triple Bonds

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

Section 8.3 Bonding Theories. VSEPR Theory Electron dot structures fail to reflect the three dimensional shapes of the molecules. VSEPR Valence Shell.

Molecule Shapes VSPR. WHAT IS VSPR? Valence Shell Electron Repulsion The idea states that covalent bonds & lone electron pairs like to stay apart because.

9-6 VSEPR (Sections 12.8, 12.9, 12.10) And you.

VSEPR Theory Valence Shell Electron Pair Repulsion.

Valence Shell Electron Pair Repulsion Theory

Valence-Shell Electron-Pair Repulsion Theory

Chapter 8 Covalent Bonding 8.3 Bonding Theories

VSEPR and Molecular Geometry

Valence Shell Electron Pair Repulsion Theory

Molecular Shape (Geometry)

Molecular Geometry (VSEPR)

Ch. 6 – Molecular Structure

Valence Shell Electron Pair Repulsion Theory

Valence Shell Electron Pair

Ch. 6.5 Bonding Theories Molecular Geometry.

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.

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____________

Molecular Geometry and VSEPR Theory

Valence Shell Electron Pair Repulsion Theory

Important Information:

Molecular Structure Molecular Geometry.

Section 5.3—Molecules in 3D

Chapter 8 Covalent Bonding 8.3 Bonding Theories

Molecular Shapes: True shapes of molecules

Chapter 8 Covalent Bonding 8.3 Bonding Theories

Valence Shell Electron Pair Repulsion Theory

Valence Shell Electron Pair Repulsion

Valence Shell Electron Pair Repulsion Theory

Objectives To understand molecular structure and bond angles

Valence Shell Electron Pair Repulsion Theory

5.1 Molecular Shape Obj 1 Chemistry.

Molecular Structure II. Molecular Geometry.

Molecular Geometry.

VSEPR Theory You will be able to determine the shapes of covalent molecules from correct Lewis Dot structures.

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 Geometry.

Molecular Shapes VSEPR Model

Molecular Shapes Mrs. Chan.

Shapes of Covalent Molecules

Molecular Geometry.

Valence Shell Electron Pair Repulsion

II. Molecular Geometry (p. 183 – 187)

II. Molecular Geometry (p. 183 – 187)

Valence Shell Electron Pair Repulsion Theory

Presentation transcript:

The Shapes of Molecules  Most molecules are 3-Dimensional molecules.  Molecules are found to have certain shapes.  Example;  a pyramid, linear, planar shape, etc.  It all depends on valence electrons around the atoms and how they repel each other.

The Shapes of Molecules  The theory used to predict and explain shapes of molecules is called VSEPR (or Valence Shell Electron Pair Repulsion Theory.)  Electron repulsion in the molecules atoms is the basis of molecules having different shapes. Hence the theory above…

Example 1; Water  Water has a bent shape (or V-shape)  This is because the 2 lone pair electrons (non-bonding electrons) repel the bonding pairs. Hence, the e’s take up positions as far apart as possible from one another.

Example 2; Ammonia  Ammonia has a trigonal pyramidal shape.  Can you see why it has a ‘pyramid’ shape??? Trace it with a pencil.  This is because the lone pair electrons (non-bonding electrons) repel the bonding pairs. Hence, the e’s take up positions as far apart as possible from one another.

Example 3; Carbon tetrachloride  a.k.a tetrachloromethane

Task  Paste the Table 6.2 (given handout) in your exercise book, after these notes. Use a whole page.  Do the Revision Questions from the Text, Page 116, Numbers 6, 7, 8.  Read pages 118 and 119 and answer Revision Question 11, Page 120.