標題:
chem 06 mc Q33,40
發問:
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http://hk.geocities.com/gotyuihk/chem1.bmp http://hk.geocities.com/gotyuihk/chem2.bmp Q33 is D ,Q40 is D 唔係好明
最佳解答:
Q.33 類似sacrificial metal when zine loses electrons, the electrons go to the copper metal because, the electrons through from higher reactive metal to less reactive metal. H+ ions gain electrons 2H+ + 2e- ----〉 H2 so the gas(H2) from on the surface of the copper plate Q.40 個Cu2+ 的濃度要兩邊一樣, 換言之,左手邊的Cu要變Cu2+(lose electrons)去增加Cu2+的濃度 Cu ---〉Cu2+ + 2e- 右邊的Cu2+要變Cu(gain electrons) 去減少Cu2+的濃度 Cu2+ +2e- ---〉Cu 所以electrons由electrodeX to electrode Y(個圖錯的) 同以上所講一樣,左手邊的Cu要變Cu2+ (mass decrease) 右邊的Cu2+要變Cu(mass increase)
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