Topic 3:Redox I

• Oxidation number: the change that an ion has or the change that it would have if the species was fully ionic
• uncombined elements have an oxidation number of 0
• compounds combined with oxygen have an oxidation number of -2
• compounds combined with hydrogen has an oxidation number of +1
• a simple ion has an oxidation number of the charge on that ion
• compound combined with fluorine has an oxidation number of -1
• when oxygen is bonded with fluorine it will have an oxidation number of +2
• in peroxides oxygen has an oxidation number of -1
• when bonded to a metal in hydrides hydrogen has a oxidation number of -1
• reduction is a decrease in oxidation number
• oxidation is an increase in oxidation number
• dispraportionation is the oxidation and reduction of the same element in a reaction