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ID:52331736
大小:204.51 KB
页数:9页
时间:2020-04-04
《电化学专业英语原电池.ppt》由会员上传分享,免费在线阅读,更多相关内容在教育资源-天天文库。
1、primarybattery庄宗霖backgroundThefactthatchemicalactioncanproduceadirectcurrentofelectricitywasdiscoveredin1785.Thesimplestchemicalcellconsistsofastripofcopperandastripofzincimmersedinasolutionofsulfuricacid.Thechemicalactionoftheacidonthezinccausestheflowof
2、electricalcharges.Thecurrentproducedistheresultofchemicalenergybeingchangedtoelectricalenergy.Whenthecopperandthezincplateareconnectedwithawire,theelectronsflowtothecopper.Thezincisthenegativeplate.Thecopperispositivewithrespecttothezinc.Thisisbecausethec
3、opperhasalowerelectricpotentialthanzinc.Inthechangefromzinctwoelectronsaregivenoff.Thezincionssurroundthezincplate,andtheelectronscollectonthecopperplateorflowthroughtheexternalcircuit.Zn→Zn2++2e-Hydrogenionsarealsopresentinthesolution.Theseexcesszincions
4、repelthehydrogenions.Thehydrogenionsaredriventothecopperstripwheretheycollectelectronsandbecomehydrogenatoms.2H++2e-→H2↑Aprimarybatterywherechemicalenergyisconvertedintoelectricalenergyismadeupoftwoelectrodesimmersedinaelectrolyte.Inthesimplestprimarybatt
5、eryelectrolyteisasolutionofsulfuricacidinthewater.summaryTheflowofelectronsfromthezincplatetothecopperplaterepresentselectricalenergy.Thisenergycomesfromthezincthathasbeendissolvedintheelectrolyte.Whenelectronsmovethroughawire,electricalenergyisavailable.
6、Movingelectronscandowork.Theycanproduceheatandlightandcanmakemotorsrun.thankyou庄宗霖
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