electrochemistryredox reactions：electrochemistryredox反应

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1、ElectrochemicalCells1.Usingreductionpotentialsanswerthefollowing.a.Whatisthestrongestoxidizingagent?b.Whatisthestrongestreducingagent?c.WillCl2beabletoreduceCr3+?d.WillPb2+oxidizeNi?e.WillAudissolveinanHClsolution?f.WillZndissolveinanHClsolution?g.WhatcanoxidizeAlbutno

2、tFe?h.WhatcanreduceI2butnotH+?2.Considerthefollowingreactionat75°C.Pb2+(aq)+2Cr2+(aq)àPb(s)+2Cr3+(aq)a.Calculatethestandardpotentialb.Calculatethestandardchangeinfreeenergyc.Calculatetheequilibriumconstantd.Iftheabovecellisallowedtooperatespontaneously,willthevoltagein

3、crease,decreaseorremainthesame?e.Iftheabovecellisallowedtooperatespontaneously,whatwillhappentotheconcentrationsattheelectrodes?f.Calculatetheinitialcellvoltagefortheabovereactioniftheinitialconcentrationsare[Pb2+]=0.25M,[Cr2+]=0.20Mand[Cr3+]=0.005M.3.Considerthefollow

4、ingcell:Cu(s)

5、Cu2+(0.001M)

6、

7、Br2(l)

8、Br-(aq)(?M)a.Assigntheelectrodesb.Determinethedirectionofelectronflowandthedirectionofthecurrentc.Describetheflowofionsinthesaltbridged.Calculatethestandardpotentiale.At25°Cthemeasuredcellvoltageis0.975V.Calculatetheconcentrationofthe

9、bromideion.4.Considerthefollowingcell:Al(s)

10、Al3+(1.0M)

11、

12、Pb2+(1.0M)

13、Pb(s)Calculatethecellpotentialafterthereactionhasoperatedlongenoughforthe[Al3+]tohavechangedby0.3Mat25°C.5.Consideracellwith0.0001MFe2+/Fe(s)and10MFe2+/Fe(s).Determinethedirectionofelectronflow,assignth

14、eelectrodesandcalculatethecellvoltageat25°C.Whataretheconcentrationsatequilibrium?6.WhatmassofCoformsfromasolutionofCo2+whenacurrentof15ampsisappliedfor1.15hours?7.Asolutionofironchlorideunderwentelectrolysisfor2hrsat10ampsyielding20.84gofiron.Whatisthemolecularformula

15、fortheironchloride?8.Consideracellwith0.0001MFe2+/Fe(s)and10MFe2+/Fe(s).Determinethedirectionofelectronflow,assigntheelectrodesandcalculatethecellvoltageat25°C.9.WhatvolumesofH2andO2atSTPareproducedfromtheelectrolysisofwaterbyacurrentof3.5ampsin15minutes?HierarchyforAs

16、signingOxidationNumbers/States1.Atomsintheirelementalform=02.Monoatomicions=charge3.Thesumoftheoxidationnumbersforcom