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Slide 1

Oxidation-Reduction Reactions

Oxidation-Reduction Reactions

LEO SAYS GER

Slide 2

Oxidation and Reduction (Redox)

Oxidation and Reduction (Redox)

Electrons are transferred

Spontaneous redox rxns can transfer energy

Electrons (electricity)

Heat

Non-spontaneous redox rxns can be made to happen with electricity

Slide 3

Oxidation Reduction Reactions (Redox)

Oxidation Reduction Reactions (Redox)

Each sodium atom loses one electron:

Each chlorine atom gains one electron:

Slide 4

LEO says GER :

LEO says GER :

Lose Electrons = Oxidation

Sodium is oxidized

Gain Electrons = Reduction

Chlorine is reduced

Slide 5

Not All Reactions are Redox Reactions

Not All Reactions are Redox Reactions

Reactions in which there has been no change in oxidation number are not redox rxns.

Examples:

Slide 6

Rules for Assigning Oxidation Numbers

Rules for Assigning Oxidation Numbers

Rules 1 & 2

The oxidation number of any uncombined element is zero

2. The oxidation number of a monatomic ion

equals its charge

Slide 7

Rules for Assigning Oxidation Numbers Rules 3 & 4

Rules for Assigning Oxidation Numbers Rules 3 & 4

3. The oxidation number of oxygen in

compounds is -2

4. The oxidation number of hydrogen in compounds is +1

Slide 8

Rules for Assigning Oxidation Number Rule 5

Rules for Assigning Oxidation Number Rule 5

5. The sum of the oxidation numbers in the formula of a compound is 0

2(+1) + (-2) = 0

H O

(+2) + 2(-2) + 2(+1) = 0

Ca O H

Slide 9

Rules for Assigning Oxidation Numbers Rule 6

Rules for Assigning Oxidation Numbers Rule 6

6. The sum of the oxidation numbers in the

formula of a polyatomic ion is equal to

its charge

X + 3(-2) = -1

N O

 X = +5

 X = +6

X + 4(-2) = -2

S O

Slide 10

Reducing Agents and Oxidizing Agents

Reducing Agents and Oxidizing Agents

The substance reduced is the oxidizing agent

The substance oxidized is the reducing agent

Sodium is oxidized it is the reducing agent

Chlorine is reduced it is the oxidizing agent

Slide 11

Trends in Oxidation and Reduction

Trends in Oxidation and Reduction

Active metals:

Lose electrons easily

Are easily oxidized

Are strong reducing agents

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