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Redox module  part one-3
 

Redox module part one-3

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    Redox module  part one-3 Redox module part one-3 Document Transcript

    • 1 RUSTING IS A REDOX REACTION• DEFINITIONS FOR OXIDATION AND REDUCTION• OXIDISING AND REDUCING AGENTS• OXIDATION NUMBER• NAMING OF COMPOUNDS USING IUPAC NOMENCLATURE NAME………………………………………………CLASS………..TEACHER……
    • 2QUESTION 1What is meant by REDOX reaction?……………………………………………………………………………………..………………………………………………………………………………………QUESTION 2What is meant by oxidation and reduction?Oxidation and reduction could be defined from 4 different angles . Fill in the table below Oxidation reaction Reduction Reaction a) Oxygen gain or oxygen loss b) Hydrogen gain or hydrogen loss c) electron transfer d) changes in oxidation numberQUESTION 3. Choose the best answer for statements below A) Definition of REDOX involving oxygen gain or oxygen loss 2Mg + CO2  2MgO + C i) Magnesium undergoes oxidation/reduction reaction because magnesium has gain/lost oxygen ii) Carbon undergoes oxidation/reduction reaction because carbon has gain/lost oxygen
    • 3B) Definition of REDOX involving hydrogen gain or hydrogen loss H2S + F2  S + 2HF i) Sulphur undergoes oxidation/reduction reaction because Sulphur has gain/lost hydrogen ii) Fluorine undergoes oxidation/reduction reaction because fluorine has gain/lost hydrogenC) Definition of REDOX involving electron transfer. First complete the ion-electron equation below And then identify whether the equations are oxidation or reduction reactions Ion-electron equations Oxidation or Reduction reactions? 1 example Mg 2+ +2e  Mg 2 2O 2-  O2 3 Cl 2  2Cl - 4 2H +  H2 5 Zn  Zn 2+ 6 2Cl -  Cl2D) Definition of REDOX involving changes in oxidation number . a) What is meant by OXIDATION NUMBER? ………………………………………………………………….
    • 4 b) Calculate OXIDATION NUMBER for the underlined below1 K2Cr2O7 6 MnO4 -2 SO2 7 FeCl33 Mg 8 H24 MgSO4 9 Br25 10 NO3 – K2SO4 c) Identify the reactions below whether they are oxidation reactions or reduction reactions by calculating the changes in OXIDATION NUMBER Reactions Changes in Oxidation reaction / oxidation number reduction reaction or neither?1 Cu 2+  Cu2 Br2  2Br-3 MnO2-  Mn 2+4 IO3 -  I25 CrO4 2-  Cr2O7 2- QUESTION 4
    • 5 State whether the following reactions are oxidation reactions or reduction reactions based on the 4 definitions of redox reactions Redox reactions Oxidation reaction / Give reasons for your reduction reaction ? answers1 Mg  MgO2 CO2 C3 H2S S4 Cl2  HCl5 NH3  N26 CuO  Cu7 Cu 2+ + 2e  Cu8 MnO 4 -  Mn 2+9 2I -  I210 FeCl3  FeCl2
    • 6A) NAMING OF CATIONS USING IUPAC NOMENCLATUREName compounds below using IUPAC nomenclature Element formulae Name a) Chromium Cr2O3 b) Copper Cu2O c) Manganese KMnO4 d) CuO e) PbO2 e) FeCl3 f) Zinc Zn(NO3)2 B) NAMING OF ANIONS USING IUPAC NOMENCLATUREName compounds below using IUPAC nomenclature elements Formulae Name a) Bromine NaBr b) Na3PO4 d) NaClO4 e) Chlorine and NaClO oxygen f) KNO3 g) NaS
    • 7 Oxidized reducedChoose the best words in the box above to fill in the blanks below A) AN OXIDIZING AGENT ……………………………………a substance b) It is ……………………………….in a redox reaction C) A REDUCING AGENT …………………….. a substance. d) It is ……………………..in a redox reaction 2FeO + C  2Fe + CO2Choose the best words in the box above to fill in the blanks below Oxidized reduced Oxidising Reducing a) FeO is the ……………………. agent for this reaction. b) It ………………………carbon into carbon dioxide c) In the process, FeO itself is ………………………….to Fe d) C is the ………………………. agent for this reaction. e) C ………………………FeO into Fe f) In the process, C itself is ………………………….to CO2