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Oxidation & Reduction

Oxidation & Reduction. Oxidation The loss of electrons Forms positive ions (cations) The atom that experiences a loss of electrons is called the reducing

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Page 1: Oxidation & Reduction. Oxidation The loss of electrons Forms positive ions (cations) The atom that experiences a loss of electrons is called the reducing

Oxidation & Reduction

Page 2: Oxidation & Reduction. Oxidation The loss of electrons Forms positive ions (cations) The atom that experiences a loss of electrons is called the reducing

Oxidation The loss of electrons Forms positive ions (cations) The atom that experiences a loss

of electrons is called the reducing agent

Page 3: Oxidation & Reduction. Oxidation The loss of electrons Forms positive ions (cations) The atom that experiences a loss of electrons is called the reducing

Reduction The gain of electrons Forms negative ions (anions) The atom that experiences a gain

of electrons is called the oxidizing agent

Page 4: Oxidation & Reduction. Oxidation The loss of electrons Forms positive ions (cations) The atom that experiences a loss of electrons is called the reducing

Redox Oxidation and reduction are paired

events occurring as two separate half-reactions

In order to have a source of electrons one element must experience oxidation

The “free” electrons are taken in by another element that is reduced

Page 5: Oxidation & Reduction. Oxidation The loss of electrons Forms positive ions (cations) The atom that experiences a loss of electrons is called the reducing

Oxidation Numbers The terms oxidation and reduction

refer to the oxidation number assigned to a particular element

This number indicates how many electrons an atom has gained (-) or lost (+)

Example: Ca2+ and O2-

Page 6: Oxidation & Reduction. Oxidation The loss of electrons Forms positive ions (cations) The atom that experiences a loss of electrons is called the reducing

Ca —>Ca2+ + 2e- (oxidation half-rxn) O + + 2e- —> O2- (reduction half-rxn) Ca + O —> Ca2+ + O2- (net reaction) Ca2+ and O2- are ionically bonded to

each other via the redox reaction