Biology 2005N Paper 3 Option H

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Prepared by Lawrence KokVideo Tutorial on Reactivity Series, Displacement reaction, Oxidation, Reduction, Oxidizing and Reducing Agent.

Video on Reactivity Series and RedoxOxidizing agent using potassium chlorateIB Chemistry Redox half reaction

Iron extraction with thermiteRedox reaction on gallium beating heart

Iron extraction with Thermite

Reactivity Series Metals are arranged according to their ability to lose electrons forming +ve ions Measure the tendency of metals in losing electrons ( undergo oxidation) Metals lose electrons forming electropositive ions Oxidation ProcessReactive metalsLess Reactive metals

Reactivity Series Metals are arranged according to their ability to lose electrons forming +ve ions Measure the tendency of metals in losing electrons ( undergo oxidation) Metals lose electrons forming electropositive ions Oxidation ProcessReactive metalsLess Reactive metals

Metals Strong Reducing AgentMetals High Tendency to lose eMetal ions Strong Oxidising AgentMetal ions High Tendency to gain e

Reactivity Series Metals are arranged according to their ability to lose electrons forming +ve ions Measure the tendency of metals in losing electrons ( undergo oxidation) Metals lose electrons forming electropositive ions Oxidation ProcessPotassium metal, K Strong Reducing Agent High Tendency to lose eGold metal Au Weak Reducing Agent Low Tendency to lose e

Reactivity Series Metals are arranged according to their ability to lose electrons forming +ve ions Measure the tendency of metals in losing electrons ( undergo oxidation) Metals lose electrons forming electropositive ions Oxidation ProcessPotassium metal, K Strong Reducing Agent High Tendency to lose eGold ion Au+ Strong Oxidising Agent High Tendency to gain ePotassium ion K+ Weak Oxidising Agent Low Tendency to gain eGold metal Au Weak Reducing Agent Low Tendency to lose e

Reactivity Series for Metals Metals are arranged according to their ability to lose electrons forming +ve ions Measure the tendency of metals in losing electrons ( undergo oxidation) Metals lose electrons forming electropositive ions Oxidation ProcessPotassium metal, K Strong Reducing Agent High Tendency to lose eGold ion Au+ Strong Oxidising Agent High Tendency to gain ePotassium ion K+ Weak Oxidising Agent Low Tendency to gain eGold metal Au Weak Reducing Agent Low Tendency to lose eStrong Reducing AgentStrong Oxidising Agent

Displacement of copper by a more reactive metal Reactive metal displaces less reactive metal from its salt solution More electropositive metal in reactivity series displaces less electropositive metal from its solutionZinc metal ( more reactive)Copper metal ( less reactive)Zn oxidised to Zn 2+ Cu 2+ reduced to Cu

Displacement of copper by a more reactive metal Reactive metal displaces less reactive metal from its salt solution More electropositive metal in reactivity series displaces less electropositive metal from its solutionZinc metal ( more reactive)Copper metal ( less reactive)Zn oxidised to Zn 2+ Cu 2+ reduced to Cu

Displacement of silver by a more reaction metal Reactive metal displaces less reactive metal from its salt solution More electropositive metal in reactivity series displaces less electropositive metal from its solutionCu oxidised to Cu 2+ Ag+ reduced to AgCopper metal (more reactive)Silver metal (less reactive)

Displacement of silver by a more reaction metal Reactive metal displaces less reactive metal from its salt solution More electropositive metal in reactivity series displaces less electropositive metal from its solutionCu oxidised to Cu 2+ Ag+ reduced to AgCopper metal (more reactive)Silver metal (less reactive)

Displacement of HYDROGEN gas from acid by reactive metal Reactive metal displaces less reactive hydrogen from acids More electropositive metal in reactivity series displaces less reactive hydrogen from acidsZinc metal (more reactive)Hydrogen (less reactive)Zn oxidised to Zn 2+ H+ reduced to H2

Displacement of HYDROGEN gas from acid by reactive metal Reactive metal displaces less reactive hydrogen from acids More electropositive metal in reactivity series displaces less reactive hydrogen from acidsZinc metal (more reactive)Hydrogen (less reactive)Zn oxidised to Zn 2+ H+ reduced to H2

Reactive metal displaces less reactive hydrogen from acids More electropositive metal in reactivity series displaces less reactive hydrogen from acidsDisplacement of HYDROGEN gas from acid by reactive metalHydrogen (more reactive)Fe, Pb, Cu, Hg (less reactive)Is there reaction between Hydrogen from HCI withFe, Pb, Cu, Hg ?

Reactive metal displaces less reactive hydrogen from acids More electropositive metal in reactivity series displaces less reactive hydrogen from acidsDisplacement of HYDROGEN gas from acid by reactive metalHydrogen (more reactive)Fe, Pb, Cu, Hg (less reactive)No displacement between less reactive metal with acidIs there reaction between Hydrogen from HCI withFe, Pb, Cu, Hg ?

Displacement of Iron from its ores (metal oxide) using Carbon/Al Reactive metal displaces less reactive metal from its ores More electropositive metal in reactivity series displaces less electropositive metal from its ores

Aluminium (more reactive)Carbon (more reactive)Iron (less reactive)Iron extraction using AluminiumIron extraction using CarbonAl + Fe2O3 Al2O3 + 2FeC + Fe2O3 3CO + 2Fe

Displacement of Iron from its ores (metal oxide) using Carbon/Al Reactive metal displaces less reactive metal from its ores More electropositive metal in reactivity series displaces less electropositive metal from its ores

Aluminium (more reactive)Carbon (more reactive)Iron (less reactive)Iron extraction using AluminiumIron extraction using Carbon

C + Fe2O3 3CO + 2FeAl + Fe2O3 Al2O3 + 2Fe

Reactivity Series for Group 7 Group 7 (halogen) are arranged to their ability to GAIN electrons forming ve ions Measure the tendency of non-metal in gaining electrons. Non-metals GAIN electrons forming electronegative ions (REDUCTION process)Halogen Strong Oxidising Agent High Tendency to gain eHalide ion Strong Reducing Agent High Tendency to lose e

Strong Oxidising AgentStrong Reducing Agent

Reactivity Series for Group 7 Group 7 (halogen) are arranged to their ability to GAIN electrons forming ve ions Measure the tendency of non-metal in gaining electrons. Non-metals GAIN electrons forming electronegative ions (REDUCTION process)Halogen Strong Oxidising Agent High Tendency to gain eHalide ion Strong Reducing Agent High Tendency to lose e

Halogen, Fluorine Strong Oxidising Agent High Tendency to gain e Due to small size + High EN valueHalide, Iodide Strong Reducing Agent High Tendency to lose e Due to increase in size + low EN value

Strong Oxidising AgentStrong Reducing Agent

Reactive halogen displaces less reactive halogen from its halide solution More electronegative halogen displaces less electronegative halogen from its halide solutionDisplacement of halogen by a more reactive halogen

Chlorine (more reactive)Bromine (less reactive)Br- oxidised to Br2 CI2 reduced to CI-

Reactive halogen displaces less reactive halogen from its halide solution More electronegative halogen displaces less electronegative halogen from its halide solutionDisplacement of halogen by a more reactive halogen

Chlorine (more reactive)Bromine (less reactive)Br- oxidised to Br2 CI2 reduced to CI-

Video on Reactivity Series and RedoxOxidizing agent using potassium chlorateIB Chemistry Redox half reaction

Iron extraction with thermiteRedox reaction on gallium beating heart

Iron extraction with Thermite

Acknowledgements

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Prepared by Lawrence Kok

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