Redox reactions

REDOX REACTIONS A.k.a. A study on why things explode

But I Know Every Rock and Tree and Creature… ,[object Object]

Oxidation of Food: What a Waste! ,[object Object],[object Object],[object Object]

Oxidation of… ,[object Object],[object Object],People!

What will I learn? ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

What is a redox reaction? ,[object Object],[object Object],[object Object],[object Object],[object Object]

Redox gain of electrons loss of electrons gain in hydrogen loss of hydrogen loss of oxygen gain in oxygen Reduction Oxidation

Oxidation and Reduction ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Oxidation and Reduction ,[object Object],[object Object],[object Object],[object Object],[object Object]

Oxidising and Reducing agent ,[object Object],[object Object]

Oxidising and Reducing Agents ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

List of common Oxidising and Reducing Agents ,[object Object],[object Object],[object Object]

Oxidation and Reduction in ‘A’ Level ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Common Oxidation States Chemical species Oxidation state and remarks Any element eg Fe, O 2 , S 8 zero Oxygen in any compound -2 except in peroxides example H 2 O 2 or Na 2 O 2 then oxygen atom has oxidation state of -1 or in F 2 O , then oxygen atom has oxidation state of +2 Fluorine in any compound -1 being most electronegative Hydrogen in any compound +1 except in metal hydrides example NaH then hydrogen atom has oxidation state of -1 as metals have a greater tendency to lose electrons Chlorine, bromine, iodine -ve oxidation state if bonded to less electronegative element eg NaCl; then Cl = -1. +ve oxidation state if bonded to more electronegative element eg ClO - , then Cl = +1; ClO 3 - , then Cl = +5

Determine the oxidation state of… ,[object Object],[object Object],[object Object],[object Object]

Determine the oxidation state of… ,[object Object],[object Object],[object Object],[object Object],[object Object]

Example 1 ,[object Object],[object Object],[object Object],[object Object],+7 +2 +2 +3

A Special Redox: Disproportionation ,[object Object],[object Object],0 +1 -1

Disproportionation Reaction ,[object Object],[object Object],[object Object],[object Object],-3 +5 +1

Non-redox reactions ,[object Object],[object Object]

Non-redox reactions ,[object Object],[object Object],Tetraammine copper(II) complex (deep blue solution) ligand

Interlude: More real-life redox!

Balancing redox reactions ,[object Object]

Balancing redox reactions ,[object Object],[object Object]

Balancing redox reactions ,[object Object],[object Object],[object Object]

The half-equation method ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Oh yeah, the blue bottle… ,[object Object],[object Object],[object Object],[object Object],[object Object]

End of Lecture 1 of Redox “ I have never let my schooling interfere with my education.” Mark Twain

The half-equation method ,[object Object]

The half-equation method ,[object Object],[object Object],[object Object],Reduced Oxidised

The half-equation method ,[object Object],[object Object],[object Object]

The half-equation method ,[object Object],[object Object],[object Object],[object Object]

The half-equation method ,[object Object],[object Object],[object Object],x 2 x 5

The half-equation method ,[object Object],+6H +

The half-equation method ,[object Object],[object Object],+6H +

The half-equation method ,[object Object],[object Object]

Redox reactions

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Redox reactions