Redox Internal 2.7

This will be completed in week 1-3 of term 3 and is worth 3 credits!

redox overview.pdf

Learn

Oxidation- reduction reactions are reactions where electrons are transferred from one chemical species to another.

If a chemical Loses Electrons it has been Oxidised.

If a chemical Gains Electrons it has been Reduced.

A REDOX reaction occurs if something has been reduced and something has been oxidised.

Oxidation Numbers

Oxidation numbers are used to help identify whether a chemical has been reduced or oxidised. There are certain rules to assigning oxidation numbers (O.N.)

If the chemical's oxidation number increases then it has been oxidised.

If the chemical's oxidation number decreases then it has been reduced.

For example if you have:

Then Mn has an oxidation number of +7 in MnO₄^-and an oxidation number of +2 in Mn⁺². So It's oxidation number has decreased so it has been reduced.

Oxidants and Reductants

If a chemical is reduced then it is called an oxidant because it oxidises the other chemcial.

Alternatively, if a chemical is oxidised then it is called a reductant because it reduces the other chemical.

Balancing Equations

Ok so this is where the majority of students lose marks because of silly little mistake when balancing equations. It is a 4 step process:

We will be doing lots and lots and lots and lots and lots and lots and lots and lots and lots and lots and lots and lots and lots........and lots and lots of practice equations to make sure you guys nail this!!!!!

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