Chemistry ace
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Chemistry ace Chemistry ace Presentation Transcript

  • Mervin Lim 3B2(12)CHEMISTRY ACEOXIDATION AND REDUCTIONREDOX
  • What is a redox?A redox is concerned with net electron flow to and from a defined centre during a chemical reaction.
  • Defined Centres Atom Atomic ion Molecule Molecular ion Multifunctional molecule
  • What is a redox? RedoxReduction Oxidation
  • Aspects Redox Oxidation ReductionOxidizing Agent Reducing AgentLose electrons Gain electrons
  • How to memorise? “LEO says GER”Lose Electrons is Oxidation Gain Electrons is Reduction
  • Sum up1. Oxidation  loss of electrons2. Reduction  gain of electrons3. Oxidizing agent  Gains electrons during reaction and therefore reduced reaction4. Reducing agent  Loses electrons during reaction and is therefore oxidized during reaction5. Oxidized form  Form of molecule lacking electrons6. Reduced form  Form of molecule having electrons
  • How can oxidation of a defined centre be changed? 1) Single Electron Transfer (SET) -To the defined centre (reduction) or from the defined centre (oxidation) E.g. Iron
  • How can oxidation of a defined centre be changed? 2) Reversal of bond polarization at defined centres E.g. Carbon
  • 3 Types of Redox Reaction1st :Gain of electrons is reduction,Loss of electrons is oxidation
  • 3 Types of Redox Reaction2nd :Gain of hydrogen* is reduction,Loss of hydrogen* is oxidation*or other electro positive element
  • 3 Types of Redox Reaction2nd :Gain of hydrogen* is reduction,Loss of hydrogen* is oxidation*or other electro positive element
  • 3 Types of Redox Reaction3rd :Loss of oxygen* is reduction,Gain of oxygen* is oxidation*or other electro positive element
  • Classification of Redox Types Single Electron Transfer Electron Donor Agent Hydride Complex Agent Lewis Acid Hydride Donor Agent Hydrogen Agent Dissolved Metal Agent Miscellaneous Agent
  • That is all Thank you