Tang 01 redox introduction 2

Oxidation-Reduction Reactions ,[object Object],[object Object],[object Object],[object Object],REDOX INTRODUCTION

Example #1 ,[object Object],[object Object],[object Object],[object Object],Reduction Oxidation Oxidation of Na REDOX INTRODUCTION Reduction of Cl 2

Redox Reactions ,[object Object],[object Object],[object Object],REDOX INTRODUCTION

Example #2 ,[object Object],[object Object],[object Object],[object Object],[object Object],Oxidized Reduced Ca: Reducing agent O 2 : Oxidizing agent Oxidized Reduced Mg: Reducing agent Br 2 : Oxidizing agent REDOX INTRODUCTION

[object Object],[object Object],[object Object],[object Object],[object Object],OXIDATION NUMBERS

Oxidation Numbers (p658) OXIDATION NUMBERS Atom or Ion Oxidation Number Examples compounds containing a single type of atom 0 Na Cl 2 H in most compounds +1 HCl H in a hydride -1 LiH O in most compounds -2 H 2 O O in a peroxide -1 H 2 O 2 monatomic ions charge of ion Na + = +1 S 2- = -2

Oxidation Numbers ,[object Object],[object Object],[object Object],[object Object],[object Object],OXIDATION NUMBERS

Example #3 ,[object Object],[object Object],[object Object],[object Object],+6 -3 +1 -2 -2 +3 OXIDATION NUMBERS

Example #3 ,[object Object],[object Object],[object Object],+4 -2 +1 -3 +1 -1 OXIDATION NUMBERS

[object Object],[object Object],[object Object],OXIDATION NUMBERS

Example #4 ,[object Object],[object Object],[object Object],[object Object],+1 -1 -2 +4 -2 +1 +6 -2 +1 +6 -2 +2 +6 0 +1 -2 oxidation reduction i. Cl atoms in KCl are oxidized (-1 to 0). Mn atoms in MnO 2 are reduced (+4 to +2) ii. KCl is a reducing agent. MnO 2 is the oxidizing agent. OXIDATION NUMBERS

[object Object],[object Object],HALF REACTIONS Zn (s) + Cu 2+ (aq)  Zn 2+ (aq) + Cu (s) Oxidation: Zn (s)  Zn 2+ (aq) + 2e - Reduction: Cu 2+ (aq) + 2e -  Cu (s)

[object Object],[object Object],HALF REACTIONS

Yes This table is similar. The higher the voltage, the more reactive the oxidizer.

Example #5 ,[object Object],[object Object],HALF REACTIONS Yes MnO 2

Tang 01 redox introduction 2

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