Redox Flashcards
Define redox
Oxidation and reduction occur in the same reaction
What is OILRIG
Oxidation is Loss of electrons/hydrogen
Reduction is Gain of electrons/hydrogen
What is an oxidising agent?
Electron acceptor
It causes oxidation of another species, itself becoming reduced
What is a reducing agent?
Electron donor
It causes another species to be reduced, itself becoming oxidised
When writing a half equation, what side of the equation are the electrons on for an oxidation and reduction?
Right hand side - Oxidation (losing electrons)
Left hand side - Reduction (gaining electrons)
Write the half equation for the reduction of Manganate, MnO4- to Manganese, Mn2+
in book
Write the half equation for the reduction of Dichromate, Cr2O7^2- to chromium, Cr3+
in book
What are features of half equations
1) Involve electrons
2) Only one species is oxidised or reduced
What are redox ionic equations? give an example
The reaction between two ionic species transferring electrons
Mg + 2H+ –> Mg2+ +H2
What are features of redox half equations?
1) Do not involve electrons
2) Two species are involved, one oxidised and one reduced
What is the process of getting an ionic equation from to half equations?
Multiply each side to get the same number electrons then write them together cancelling the electrons.
What is disproportionation?
Oxidation and reduction of the same element in the same reaction
What is oxygens oxidation number in most cases and are there any exceptions?
It is generally -2 except for peroxides and F20
What is hydrogens oxidation number in most cases and are there any exceptions?
Generally +1 except in hydrides.
