Oxidation-Oxidation-Reduction Reduction ReactionsReactions

RedoxRedox

Iron is oxidized when it rusts.Iron is oxidized when it rusts.

What Are Oxidation and What Are Oxidation and Reduction?Reduction?

Oxygen and Oxygen and RedoxRedox

A Bunsen burner A Bunsen burner oxidizes the oxidizes the methane in natural methane in natural gas to carbon gas to carbon dioxide and water.dioxide and water.

What Are Oxidation and What Are Oxidation and Reduction?Reduction?

Carbon is oxidized when charcoal Carbon is oxidized when charcoal burns.burns.

RedoxRedox Oxidation Oxidation is loss of electronsis loss of electrons Reduction Reduction is the gain of electronsis the gain of electrons Oxidizing agent is the atom that accepts

electrons Reducing agent is the atom that

provides electrons The atom that increases in oxidation

number is oxidized The atom that decreases in oxidation

number is reduced

LEO GER

OIL RIG

Oxidation and Reduction Oxidation and Reduction ExampleExample

Redox Reactions That Form IonsRedox Reactions That Form Ions

Oxidation and Reduction Oxidation and Reduction ExampleExample

Oxidation and Reduction Oxidation and Reduction ExampleExampleThe substance that loses electrons The substance that loses electrons

is called the is called the reducing agent.reducing agent. The substance that accepts The substance that accepts electrons is called the electrons is called the oxidizing oxidizing agent.agent.

Rules for Assigning Oxidation Rules for Assigning Oxidation NumbersNumbers

QuantityQuantity Oxidation NumberOxidation Number

1. Uncombined Atom1. Uncombined Atom 00

2. Monotomic Ion2. Monotomic Ion Ionic ChargeIonic Charge

3. Hydrogen3. Hydrogen +1+1

(except when combined w/ (except when combined w/ metals~-1)metals~-1)

4. Oxygen4. Oxygen -2 -2

(except in peroxides~-1)(except in peroxides~-1)

5. Algebraic sum of oxidation numbers in a polyatomic ion 5. Algebraic sum of oxidation numbers in a polyatomic ion is equal to the ions charge.is equal to the ions charge.

6. Algebraic sum of oxidation numbers in a neutral 6. Algebraic sum of oxidation numbers in a neutral compound is equal to zero.compound is equal to zero.

7. Oxidation numbers are written for each atom7. Oxidation numbers are written for each atom