CHEM 222 Lecture Notes - Lecture 10: Infrared Spectroscopy, Intermolecular Force, Chemical Formula

• School: McGill University
• Department: Chemistry
• Course: CHEM 222
• Professor: Laura Pavelka

Document Summary

Determine the net dipole of a given molecule. Describe the origin and strength of each type of intermolecular interaction. Explain the link between intermolecular forces and physical properties (ie. mp, bp, solubility) Predict the relative mp/bp/solubility of different species given a lewis structure. Understand the basics of ir absorption and spectrum collection. Predict/rationalize the intensity and frequency of different ir absorption bands. Assign key ir absorption bands to specific bonds (functional groups) Use an ir spectrum to help elucidate the structure of an unknown, given at least a molecular formula. Ability to recognize and work with patterns. Connection of invisible, microscopic properties to visible, macroscopic observations. Problem 1. 1: molecular polarity: draw the lewis structures of (ch3)2co, n(ch3)3, and bhf2, identify the molecular geometry and polar bonds, determine if the molecule is polar or non-polar and predict the direction of the dipole moment. Problem 1. 2: intermolecular forces and physical properties: describe the intermolecular forces, in decreasing significance, for, h2co.