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Chemistry SPM ElectroChemical Series

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Chemistry SPM ElectroChemical Series
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  4541 CHEMISTRY   Chapter 6 DElectrochemical Series   Electrochemical Series is an arrangement of elements  according to their tendenc to release electrons  to form a …………………………..   ElectrochemicalSeries ! "aCaMg#l$n%eSn&'HC(#g D1 Snthesising  Electrochemical Series  The construction of Electrochemical Series based on ;  I  : The voltage differences  of the pair of metals Chapter 6  Electrochemistry 39 M)RE E*ECTR)&)SITI+E Easier to release/donate electrons to form a positive ion (cation! %orm positi,e ions easil " #etal Y Electrol$te#etal -+  positive ion  4541 CHEMISTRY   Chapter 6   &air of metal-.Y+oltage/+0&ositi,eTerminal"egati,eTerminalMg . C( %.&'u#g $n . C( .'u)n %e . C( *.+'u,e &' . C( *.-'ub C( . C( *.* • The  greater   the voltage produced0 the  further   is the separation of the paired metals in the Electrochemical Series. • #etals 1hich have a higher  tendency to ionise  (higher position in the Electrochemical Series 1ill be the negative  terminal. • #etals 1hich have a lower  tendency to ionise  (lo1er position in the Electrochemical Series 1ill be the  positive  terminal. Sample question  :Table belo1 sho1s the voltage and positive terminal of three chemical cells. &air of metalCell ,oltage.+&ositi,e terminal  and 2%.-2 and 3.*  and S*.%S4hich of the follo1ing is the correct arrangement of the metals in the Electrochemical Series starting 1ith the most electropositive metal5 # 0 20 0 S  20 0 0 S C 20 0 S0  D S0 0 0 2 Chapter 6  Electrochemistry 6* The tendenc$ for metals to ionise is increase #g)n,eb'u   235   7 23  7 131  7 3  7 &7 35 R  832 S 23+oltage.+  4541 CHEMISTRY   Chapter 6  II  : The capability of metals to displace other metals  from its salt solution.   (8isplacement reaction   f reaction occurs  : ! e.g : &   is Mg  ; Salt solution contain   C( 9 ions  "   2 m    n   2 // #g  'u %   #g %   'u  The position of metal &  is higher than metal 7  in the Electrochemical Series.  &  is more electropositive than 7   f no reaction   occurs : ! e.g : &   is   #g  ; Salt solution contain   $n 9 ions  "   The position of metal &  is lo1er than metal 7  in the Electrochemical Series.  &  is less electropositive than 7  Activity 9 :<$ using the Electrochemical Series0 complete the table belo1 :   Sol(tionMetalC(&'%e$nMgC(/") 8 0  :::: &'/") 8 0  - ::: %eS) 4 -- :: $nS) 4 --- : MgS) 4 ----Total : 2 (the least  reactive 184 (the most  reactive :   reaction occur; - no reactionThe arrangement of metals in the Electrochemical Series is : Chapter 6  Electrochemistry 6 #etal & Salt solution contains metal 7  ion0 7 m9 The tendenc$ for metals to ionise increases Mg$n%e&'C(Mg can displace  C( from  C(S) 4   sol(tion #g cannot displace  $n from  $nCl  sol(tion  4541 CHEMISTRY   Chapter 6  Activity %* : 1 =n e>periment is carried out to determine the relative position of three metals; silver0 ? and # in the Electrochemical Series. 8iagram <elo1 sho1s the result of the e>periment. E;perimentIIIIII Set up of apparatus@bservation   Are$ deposit   'olour less solution   Are$ deposit   ?ight  blue solution    Bo change     Inferences  :E>periment I  :(a *   can .cannot C displace silver from silver nitrate solution.(b *  is more .less C electropositive than silver.(cThe position of *  is higher .lo<er C than silver in the Electrochemical Series.E>periment II  :(d M   can .cannot C displace silver from silver nitrate solution.(e M  is more .less C electropositive than silver.(fThe position of M  is higher.lo<er C than silver in the Electrochemical Series.E>periment III  :(g M   can. cannot C displace *  from silver nitrate solution.(h M  is more. less C electropositive than * .(iThe position of M  is higher. lo<er C than *  in the Electrochemical Series.    Conclusion  :The order of the three metals is :  ,igure belo1 sho1s the order of metal 0 20  and S in the Electrochemical Series. Chapter 6  Electrochemistry 6% 0 20 0 S 8ecreasing order of electropositivit$   Silver nitrate solution *MM*  nitrate solutionncreasing of electropositivit$ #gM*S&M 22 = & > 7?/'0  4541 CHEMISTRY   Chapter 6 8escribe a la'orator e;periment  to sho1 the order of these metals in the Electrochemical Series based on the abilit$ of a metal to displace another metal from its salt solution. D Importances  of the Electrochemical Series      %o(r  main (ses  of the Electrochemical Series :(a to predict the chemical cell terminals  more  electropositive metal negati,e  terminal  less  electropositive metal positi,e  terminal  Activity % :redict and marD the positive and negative terminals for the follo1ing cells : Chapter 6  Electrochemistry 63 ElectrochemicalSeries The terminals  of thechemical cell > The metal 1hich is situated at a ………………. position in the Electrochemical Series 1ill be the ……………. terminal 1hile the metal 1hich is situated at a ……………. … position in the Electrochemical Series 1ill be the ……………………… terminal. The ,oltage  of chemical cell > The further apart the metals are in the Electrochemical Series0 the ……………. is the voltage. The a'ilit  of a metal to displace  another metal from its salt sol(tion > = metal 1hich is situated at a……………. position in the Electrochemical Series is able to ……………. a metal belo1 it in the series from its salt solution. The ion selected  to dischage > on at a ………….... position in the Electrochemical Series0 1ill be selected to discharge at anode or cathode.   + )n=g=gB@ 3 (a + 'u#g'uS@ 6 (a lo<erhigherlo<erpositi,enegati,ehigherhighererdisplace99
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