short summary for redox reactions

a short summary

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  • Created by: saraht
  • Created on: 25-05-11 09:01
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4 definitions of redox:
Defining in terms of Oxidation Reduction
Gaining or losing oxygen gains oxygen loses oxygen
Gaining or losing hydrogen loses hydrogen gains hydrogen
Electron transfer loses e- gains e-
Change in oxidation number O.N. of an element increases O.N. of an element decreases
Oxidizing property: Cl (aq) oxidizes bromide/iodide ions to bromine/iodine
o Rxn with cold and dilute NaOH (aq) NaOCl
o Rxn with hot and conc. NaOH(aq) NaClO3
Nitric acid:
Conc HNO3 oxidizes metals, reduced to NO2
Hot conc HNO3 oxidizes non-metals such as C(s) and S(s), reduced to NO2
Dilute HNO3 oxidizes Cu, reduced to NO
Conc sulphuric acid:
Oxidizes most metals, reduced to SO2
Oxidizes most non-metals
Reacts w/ NaBr to give HBr then oxidizes HBr to Br2
Reacts w/ NaI to give HI then oxidizes HI to I2
Sulphur dioxide:
Reducing: SO2(aq) reduces Cr2O7- to Cr3+
Distinguishing cathode and anode:
Cathode (Reduction) Anode (Oxidation)
Chemical cell +ve -ve
Electrolytic cell -ve +ve
Factors affecting discharge of ions:
1. Position of ions in ECS
2. Concentration of solution
3. Nature of electrodes used


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