redox Flashcards
1
Q
what oxidation number to uncombined elements have
A
0
2
Q
what oxidation number is aluminium
A
+3
3
Q
what oxidation number does hydrogen have
A
+1
-1 in metal hydrides eg NaH
4
Q
what oxidation number does chlorine have
A
-1
in a compound with F or O it has positive value eg ClF3 it is +3
5
Q
what oxidation number does oxygen have
A
-2
in peroxides it is -1 eg H2O2
+2 in OF2
6
Q
what is an oxidising agent
A
accepts electrons from a species being oxidised therefore is reduced
7
Q
what is a reducing agent
A
donates electrons to species being reduced, therefore is oxidised
8
Q
rules for ionic half equations
A
1) balance all species
2) balance oxygen using H2O
3) balance hydrogen using H+
4) balance charges using e-
