• San Jacinto Community College

• CHEM 1311

LAB 14 Lab 14 Lewis Structures. MOLECULAR AND POLYATOMIC ION

SHAPES AND BONDING

Adapted from Chemistry 11th ed. by Raymond Chang.

NAME: _________________________________________SECTION:___________

In this lab, you will draw the Lewis structure of molecules and polyatomic ions and determine the number of Bond Pairs (BP) and Lone

Pairs (LP) around the central atom. You will predict Electronic Geometry, bond angles, Molecular Geometry, polarity, and hybridization

of the central atom. Before you begin this lab, look over the material on writing Lewis structures, the Valence Shell Electron Pair

Repulsion Theory, VSEPR, and the Valence Bond Theory, VB, found in Chapter 9 and 10 of the text.

BUILD THE FIVE BASIC SHAPES WITH MOLECULAR MODELS BEFORE YOU START THIS LAB. Refer to Table 10.1,

p. 416, for these five shapes and bond angles in each shape. The Electronic Geometry, or arrangement of electron pairs, is determined

from the total electron pairs around the central atom (Bond Pairs + Lone Pairs). Note that the Electronic Geometry and the Molecular

Geometry are the same when the central atom has no Lone Pairs.

Table 10.2, p. 422, has the Molecular Geometry of molecules and ions that have one or more Lone Pairs on the central atom.

Refer to Table 10.4, p. 438, for the hybrid orbitals.

Complete the following tables for the twenty molecules and polyatomic ions listed.