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Redox. A reaction in which electrons are transferred from one atom to another is called an oxidation-reduction reaction, or “ redox ” for short. Redox. Originally, the word “oxidation” referred to reactions with oxygen. In combustion reactions, oxygen steals electrons from other atoms.

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redox
Redox

A reaction in which electrons are transferred from one atom to another is called an oxidation-reduction reaction, or “redox” for short.

redox1
Redox

Originally, the word “oxidation” referred to reactions with oxygen.

In combustion reactions, oxygen steals electrons from other atoms.

redox2
Redox

Today, “oxidation” refers to any kind of atom stealing electrons from another.

redox3
Redox

Ger…

redox4
Redox

Ger…

Loss of

Electrons is

Oxidation

Gain of

Electrons is

Reduction

oxidation number
Oxidation Number

The oxidation number of an atom in an ionic compound is thenumber of electrons lost or gained when it forms an ion.

oxidation number1
Oxidation Number

Ca + Br2 → CaBr2

oxidation number2
Oxidation Number

Ca + Br2 → CaBr2

Ca + Br2 → Ca2+ + 2Br-

oxidation number3
Oxidation Number

Ca + Br2 → Ca2+ + 2Br-

oxidation number4
Oxidation Number

Ca + Br2 → Ca2+ + 2Br-

Ca2+ charge = 2+

Br-charge = 1-

oxidation number5
Oxidation Number

Ca + Br2 → Ca2+ + 2Br-

Ca2+ charge = +2

oxidation number = +2

Br-charge = -1

oxidation number = -1

oxidation number6
Oxidation Number

Ca + Br2 → Ca2+ + 2Br-

Calcium is oxidized by bromine.

oxidation number7
Oxidation Number

Ca + Br2 → Ca2+ + 2Br-

Calcium is oxidized by bromine.

Bromine is reduced by calcium.

oxidation number8
Oxidation Number

Ca + Br2 → Ca2+ + 2Br-

Calcium is oxidized by bromine.

Bromine is reduced by calcium.

An oxidizing agent takes electrons.

oxidation number9
Oxidation Number

Ca + Br2 → Ca2+ + 2Br-

Calcium is oxidized by bromine.

Bromine is reduced by calcium.

An oxidizing agent takes electrons.

A reducing agent gives electrons.

oxidation number10
Oxidation Number

Ca + Br2 → Ca2+ + 2Br-

Calcium is oxidized by bromine.

Bromine is reduced by calcium.

An oxidizing agent takes electrons.

A reducing agent gives electrons.

(LEO says GER)