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? asked in 科學及數學化學 · 1 decade ago

(20)!!DRY CELL有番電...點解

我想問下點解電池用用下會冇哂電

但係放幾日就會有番電嫁呢??

係唔係入面既REACTION有問題??

'

求中英文全解釋

1 Answer

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  • 1 decade ago
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    當電池放電時,在陽極進行氧化反應,而陰極進行還原反應。當電池使用一段時間後,在陽極和陰極上,大量消耗了反應物,而同時大量聚積了生成物。故此,陽極和陰極上進行的反應物濃度很低,令電池的氧化還原停止。

    當電池放置數日後,電解質內物質的擴散作用,令陽極和陰極上,反應物濃度增高,而生成物濃度下降。因為電極的反應物濃度增加到一定程度,所以電極可以進行氧化還原反應,繼續放電。

    When the cell discharges, oxidation occurs at the anode, and reduction occurs at the cathode. When the cell is used for a long time, a lot of reactants are consumed at the anode and the cathode, and a lot of products accumulate simultaneously. Therefore, the concentrations of reactants are very low at the surface of the anode and that of the cathode. This would stop the redox reaction in the cell

    When the cell is put aside for a few days, the diffusion of the substances in the electrolyte increases the concentrations of reactants at the anode and cathode, and decreases the concentrations of products. The electrodes can discharge by undergoing oxidation and reduction, because the concentrations of reactants increase to a certain extent.

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