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Have you ever seen brown iron? What is this brown coloring and where does it come from?
Oxidation-reduction reactions (or redox reactions) are reactions which involve the transfer of electrons from one reactant to the other.
Oxidation is the loss of electrons, while reduction is the gain of electrons.
An easy mnemonic to help you remember this is to remember that "LEO says GER."
(Loss of Electrons - Oxidation; Gain of Electrons - Reduction)
In redox reactions, the oxidation and reduction of reactants come hand in hand. If one reactant is oxidized, there must be a reactant that is reduced as well. Why must this be true?
In redox reactions, half-reactions are used to show the oxidation and reduction processes.
If you combined the two half reactions above, what is the full reaction that proceeds? Note: The electrons on the reactant and product side of the equation should cancel out.
For guidance in answering the above questions or for more information, look here.
For guidance in balencing and writing redox reactions, look here.