Core Reactions: Redox

Core Reactions: Redox

Slide 32 of 42

Redox Reaction: Half-reactions (equations)

The redox—made up of reduction and oxidation—can be represented by equations like so:

Oxidation: Zn (s) ® Zn2+(aq) + 2e–

Reduction: Cu2+ (aq) + 2e– ® Cu (s)

The equations above showing each half of the redox process involved are referred to as half-reactions (equations).

The first one shows oxidation therefore it’s referred to as an oxidation half-reaction (equation).

–Electrons are lost by Zn (electrons are shown as a product)

The second one shows reduction and so is referred to as a reduction half-reaction (equation).

–Electrons are gained by Cu2+ (electrons are shown as a reactant)

This electron transfer that take place in a redox reaction can also be made to flow through an external circuit producing electrical energy, which is the basis for batteries.