Originally posted by 納比 at 2005-3-18 05:12 PM:
ｘ．．．Lewis acid 乜野黎的．．．
同bronsted-lowry acid既定義完全相反:icon101:
聞說完全掌握的的話
inorg可以一條式都唔法背:icon083:
Originally posted by kawai at 2005-3-18 06:32 PM:
同bronsted-lowry acid既定義完全相反:icon101:
聞說完全掌握的的話
inorg可以一條式都唔法背:icon083:
但係out c:icon101:
Originally posted by kawai at 2005-3-18 18:32:
聞說完全掌握的的話
inorg可以一條式都唔法背:icon083:
我寧願背 :icon101:
Originally posted by Newcastle Fans at 2005-3-18 06:39 PM:
我寧願背 :icon101:
事實上唔係難野:icon023:
但係點樣將佢同條式融會貫通先係最難:icon083:
Originally posted by Newcastle Fans at 2005-3-18 01:10 PM:
有個大問題... help!
2003年Paper II
No.7(b)(iii)
係問點樣將benzene變做diphenylmethane... (一個carbon連住兩個H同埋兩個benzene ring)
marking scheme就用左3個step...
佢隔離就寫左D野... 係用一個ste ...
actually AlCl3 and FeCl3 are the same
主要都係想整e條野出黎
FeCl3 + R-Cl <----> FeCl4 - + R+
AlCl3 + R-Cl <-----> AlCl4 - + R+
唔知arm唔arm~
我想問下關於cell diagram的
93 paper 2
咁marking 話
Cathode:Pb02(s)+ 4H+(aq) + SO4^2-(aq) + 2e- > PbSO4(s) + 2H2O(l)
Anode:Pb(s) + SO4^2-(aq) > PbSO4(s) + 2e-
Cell diagram:
Pb(s)|PbSO4(s)|PbO2(s)|H2SO4(aq)|PbSO4(s)|Pb(s)
點解可以skip左anode既SO4^2- and cathode 既H2O?乜唔係要寫晒既咩?
仲有寫anode/cathode既component 係未唔駛順序寫(即係由reactant side到product)，我見marking有時就掉轉左:icon018:
THX:icon029:
又有稀客
welcome back:)
Originally posted by nichart at 2005-3-26 10:29 PM:
我想問下關於cell diagram的
93 paper 2
咁marking 話
Cathode:Pb02(s)+ 4H+(aq) + SO4^2-(aq) + 2e- > PbSO4(s) + 2H2O(l)
Anode:Pb(s) + SO4^2-(aq) > PbSO4(s) + 2e-
Cell diagram:
Pb ...
望下98年II 4 o既marking
應該幫到你:icon101:
我想問下... 最少有幾多先secure到一個B... 65%?
仲有一個問題...
如果我地有個咁既reaction
A + B ------> C + D
我地有 at diffient time
咁我地要prove個reaction w.r.t. 係1st order
我地畫呢個graph: ln Vs time
有straight line就得
咁我地可唔可以畫呢個呢?
ln ( initial / ) Vs time
會有一條straight line passing through origin
得唔得呢?
隔離班就用得
但我地班阿sir冇講過
marking scheme亦冇用過呢條
但一樣prove到, 一樣計到rate constant
Originally posted by Newcastle Fans at 2005-3-28 05:51 PM:
我想問下... 最少有幾多先secure到一個B... 65%?
>65 gwa
我覺得咁多年past paper....99好X難
Originally posted by Newcastle Fans at 2005-3-28 06:22 PM:
仲有一個問題...
如果我地有個咁既reaction
A + B ------> C + D
我地有 at diffient time
咁我地要prove個reaction w.r.t. 係1st order
我地畫呢個graph: ln Vs time
有straight line就得
...
根本一樣...
ln 係一個const.