Redox and Oxidation Numbers Flashcards
What happens when an element is oxidised
It loses electrons
What happens when an element is reduced
It gains electrons
What oxidation number do all uncombined elements have
0
What is the oxidation number of ions
Oxidation state is the same as the charge
What oxidation number do all neutral compounds have
0
What is the oxidation number of complex ions
Overall oxidation number is equal to their charge
What elements have a reliable oxidation number of 1
Hydrogen, group one metals and silver
What elements have a reliable oxidation number of 2
Group 2 metals and zinc
What element has a reliable oxidation number of -1
Fluorine (other halogens usually -1 also but can vary)
What is the oxidation number of oxygen most of the time
-2
What is a redox reaction
Where elements or compounds are both reduced and oxidised in the same reaction
What is it called when the same element is both oxidised and reduced in the same reaction
Disproportionation
