chp4notes - Chapter 4. Balancing Oxidation Reduction...

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
Chapter 4. Balancing Oxidation Reduction Reactions Van Koppen Chem. 1A F04 Simple Conventions to Assign Oxidation States: 1) The oxidation numbers of the atoms in a neutral molecule must add up to zero, and those in an ion must add up to the charge on the ion. All elements have oxidation states of zero (e.g. Na(s), O 2 (g), H 2 (g), Cl 2 (g), etc.) 2) Alkali metal atoms (Group I) have oxidation number +1 in their compounds, and alkaline earth atoms (Group II) have oxidation number +2 in their compounds. 3) Fluorine always has an oxidation number of –1 in its compounds, and other halogens have an oxidation number –1 in their compounds except in compounds with oxygen and with other halogens, where they can have positive oxidation numbers. ClO NaCl SF 6 (Each fluorine in SF 6 is assigned an oxidation state of –1.) + 1 – 2 + 1 – 1 + 6 – 1 4) Hydrogen is assigned an oxidation number of +1 in its compounds, except metal hydrides such as LiH where convention 2 takes precedence and hydrogen has an oxidation number –1. H
Background image of page 1
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 05/13/2008 for the course CHEM 1A taught by Professor Van koppen during the Fall '07 term at UCSB.

Ask a homework question - tutors are online