好難!!chemical cell會考題~~help me>.<""~~~~~~~~~~aaaaaa
CE 2006 mc Q40In the setup, the electron flow in such a direction that the conc. of the Cu2+ ion in the two beaker become the same.
the ans is : the mass of electrode X will decrease while the mass of Y increase
我唔明點解
1.咁樣仲會有electron flow..兩邊唔系一樣ga咩??conc.會影響到??
2.好咁佢有electron flow,但系點解會系由個copper electrode會lost電子?兩邊electrode一樣咁唔系應該睇個solution咩??? conc. 唔同,有potential difference掛
唔係...H 比 Cu 係ECS 高, Cu2+ is preferentially discharged
因為佢點都要放電子,所以係Cu 放
[ 本帖最後由 piyopiyo 於 17-4-2008 18:18 編輯 ] 用少少A-level 扮下野先
Nernst equation
E = E' -RT/nF *lnK
對於Cu系統
Cu2+ +2e-<==>Cu
equilibrium K = 1/
由數學所知, ln1=0
foX= 1/ >1
ln X >0
so 0.02M 果個個E' 係細過standard condition 果個
所以佢會做anode(negative pole), loss of e-
係cathode(+ve) gain of e- of Cu2+ -> 請問條式入面E同E'分別代表d咩???佢地愈大愈姐系點?? 原帖由 samson2020 於 17-4-2008 12:47 發表 http://www1.nakuz.com/bbs/images/common/back.gif
請問條式入面E同E'分別代表d咩???佢地愈大愈姐系點??
成個電池的e.m.f = E cathode- Eanode
cathode - place for reduction
anode - place for oxidation
要一個cell run到, overall e.m.f 要大過0
E => e.m.f at a certain condition
E' => standard reduction potential.
無,我只係用來比較下邊個cell 有較大機會做cathode 咁E' 系條題目入面系constant??
跟住因為conc.唔同,所以出黎果個E就唔同???
current會由大E去細E???? 原帖由 samson2020 於 17-4-2008 14:36 發表 http://www.nakuz.com/bbs/images/common/back.gif
咁E' 系條題目入面系constant??
跟住因為conc.唔同,所以出黎果個E就唔同???
current會由大E去細E????
我看來講得太遠
都係算XD 原帖由 Zend 於 17-4-2008 22:39 發表 http://www1.nakuz.com/bbs/images/common/back.gif
我看來講得太遠
都係算XD
冇得算呀-.-次次問親野個個都系咁....:'( 原帖由 samson2020 於 17-4-2008 23:08 發表 http://www.nakuz.com/bbs/images/common/back.gif
冇得算呀-.-次次問親野個個都系咁....:'(
因為這裡的AL人喜歡以AL 方法回答...
而你問ge題目係無CE人識答,所以就係咁[] 我係CE人AR ...
AL人 D野真係勁.. 完成唔明講緊咩 0== []
答返問題
我係咁諗JA..
題目話左 In the setup, the electron flow in such a direction that the conc. of the Cu2+ ion in the two beaker become the same.
咁即係 X 放d Cu2+落水
Y吃左d Cu2+from水
咁先可以balance到個concentration
咁即係X 放e-
Y 接e-
ans 自己揹搞佢 點解la []
ps:你咁早溫完chem[]
我而家chem都未溫完ar
現在全力溫phy ...中,,,
[ 本帖最後由 octopus001 於 18-4-2008 05:07 編輯 ]
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