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Chemistry Chapter 20

Oxidation - Reduction Reactions

Oxidation - reduction reactions The chemical changes that occur when electrons are transferred between reactants, also called redox reactions
Oxidation Originally meant the combination of an element with oxygen to give oxides
Reduction The loss of oxygen from one compound
Reducing Agent The substance in a redox reaction that donates electrons
Oxidizing Agent The substance in a redox reaction that accepts electrons
Oxidation Number A positive or negative number assigned to an atom according to a set of arbitrary rules
Half-Reaction An equation showing either the reduction or the oxidation of a species in an oxidation-reduction reaction
Spectator Ion The ion that remains unchanged in charge
Why must oxidation and reduction occur together? Oxidation and reduction always occur together. If one substance gives away oxygen (oxidation), a second substance must be present to take on that oxygen (reduction).
Created by: readyokaygo