CHEM 1A03 Lecture Notes - Lecture 6: Sodium Chloride, Joule, Phenylalanine

• School: McMaster University
• Department: Chemistry
• Course: CHEM 1A03
• Professor: David Brock

Document Summary

Properties of water contact of molecules or ions upon freezing. Relatively high boiling point for a small, simple molecule. Mainly exists in liquid state important reaction medium, facilitates. Only non-metallic substance that expands upon freezing lower density. Very high heat capacity can store and release large amounts of heat. Universal solvent able to dissolve a large variety of solutes. Leads to waters unique properties (from extreme dipole movements in water) Positive hydrogen atoms coordinate strongly to lone electron pairs on oxygen. Strongest intermolecular force among electrically neutral molecules. Each water molecule is capable of forming 4 hydrogen bonds: 2 with lone pairs, 2 with hydrogen. Solubilization of ionic or polar solutes = hydration. Energy released strong dipole in water react with ions in solution, or other strong dipoles. Nacl(aq) sodium and chloride ions surrounded by water molecules and are hydrated. Negative dipole of water and hydrogen atom of polar molecules.