Topic 3 Redox Flashcards
All uncombined elements have an oxidation number of
0
Elements that are bonded to identical atoms will have an oxidation number of
0
The oxidation number of a simple, monoatomic ion is
The same as its charge (e.g. Na+ = +1)
For molecular ions
The sum of the oxidation numbers is the same as the overall charge of the ion
Hydrogen always has an oxidation number of
+1 except in metal hydrides where it is -1 and in molecular hydrogen where it is 0
Oxygen nearly always has an oxidation number of
-2 except in peroxides where it is -1 and in molecular oxygen where it is 0
Unless you are told otherwise
You can assume the overall charge on a compound is 0
Chlorine’s oxidation number is always
-1
Disproportionation reaction:
Is a special redox reaction where an element is being reduced and oxidised at the same time
Define oxidation in terms of the movement of electrons.
Oxidation is the loss of electrons
Define the term oxidising agent in terms of electron movement.
An oxidising agent accepts electrons and gets reduced
SO4 has an overall charge of
-2
