[DSE化學2017]同學準備好DSE CHEM未?

化學艾維斯

1001 回覆
44 Like 6 Dislike
.👁. 2017-04-12 13:07:53
paper 1最難應該係electrolysis H2SO4同果舊organic compound HA->A- + H+果舊 indicator黎

1:49xxx?

49xxx: 1
佢係問HA to A-

係 個陣都心諗伏到你

唔算好伏啦，寫到明既
人月兩團圓 2017-04-12 13:07:55
paper 1最難應該係electrolysis H2SO4同果舊organic compound HA->A- + H+果舊 indicator黎

1:49xxx?

49xxx: 1
佢係問HA to A-

係 個陣都心諗伏到你

我直接 A-:HA =1:49xxx咁係冇分？
Johnnychun 2017-04-12 13:08:35
想問electrolysis 個條K2SO4 換H2SO4
全部答same observation 攞3分？
陳再修 2017-04-12 13:08:35
paper 1最難應該係electrolysis H2SO4同果舊organic compound HA->A- + H+果舊 indicator黎

1:49xxx?

係 大約50000:1
HA>>>>A-

點計 完全諗唔到

pH=-log[H+]
K=[A-][H+]/[HA]


我係咁做。。。。點解出唔到依啲答案

條題目係點
有冇數字
就咁睇好數學
人月兩團圓 2017-04-12 13:09:19
paper 1最難應該係electrolysis H2SO4同果舊organic compound HA->A- + H+果舊 indicator黎

electrolysis of H2SO4 有咩難？

轉咗H2SO4有冇change in observation?

Suppose b 有gwa
1. More air bubble
2. 我寫左粉紅色範圍細左
你傻鳩呀 2017-04-12 13:10:02
paper 1最難應該係electrolysis H2SO4同果舊organic compound HA->A- + H+果舊 indicator黎

electrolysis of H2SO4 有咩難？

轉咗H2SO4有冇change in observation?

Suppose b 有gwa
1. More air bubble
2. 我寫左粉紅色範圍細左

屌我寫咗no change in observation
Johnnychun 2017-04-12 13:10:42
paper 1最難應該係electrolysis H2SO4同果舊organic compound HA->A- + H+果舊 indicator黎

electrolysis of H2SO4 有咩難？

轉咗H2SO4有冇change in observation?

Suppose b 有gwa
1. More air bubble
2. 我寫左粉紅色範圍細左

屌我寫咗no change in observation


EAA唔似會出2.呢d 答案
人月兩團圓 2017-04-12 13:10:51
paper 1最難應該係electrolysis H2SO4同果舊organic compound HA->A- + H+果舊 indicator黎

1:49xxx?

係 大約50000:1
HA>>>>A-

點計 完全諗唔到

pH=-log[H+]
K=[A-][H+]/[HA]


我係咁做。。。。點解出唔到依啲答案

條題目係點
有冇數字
就咁睇好數學

Given pH 好似~2.5
Given K ~10^-8??? 唔記得
Ask A-:HA ratio
人月兩團圓 2017-04-12 13:11:47
paper 1最難應該係electrolysis H2SO4同果舊organic compound HA->A- + H+果舊 indicator黎

electrolysis of H2SO4 有咩難？

轉咗H2SO4有冇change in observation?

Suppose b 有gwa
1. More air bubble
2. 我寫左粉紅色範圍細左

屌我寫咗no change in observation


EAA唔似會出2.呢d 答案

都啱
Linux_Tux 2017-04-12 13:11:47
有無mc答案
.👁. 2017-04-12 13:12:15
paper 1最難應該係electrolysis H2SO4同果舊organic compound HA->A- + H+果舊 indicator黎

1:49xxx?

係 大約50000:1
HA>>>>A-

點計 完全諗唔到

pH=-log[H+]
K=[A-][H+]/[HA]


我係咁做。。。。點解出唔到依啲答案

似係禁錯機
我通常禁機禁兩次
pH係2.4
K係8x10^-8
應該計到接近既答案
巴麻美學姐 2017-04-12 13:14:26
lm 睇paper 2
van_der_Sar 2017-04-12 13:14:54
竟然俾晒提示話order of reaction唔一定整數
你傻鳩呀 2017-04-12 13:15:15
Paper2係咪算難?
李中龍 2017-04-12 13:15:24
考定感覺良好
真係多謝樓主同各位巴打
今年同上年個Posts都學到好多野
Linux_Tux 2017-04-12 13:15:35
竟然俾晒提示話order of reaction唔一定整數

笑咗
可能啲人唔識log
人月兩團圓 2017-04-12 13:16:21
竟然俾晒提示話order of reaction唔一定整數

笑咗
可能啲人唔識log

2.83???
2???
除唔盡ge

1.5
Linux_Tux 2017-04-12 13:16:35
Paper2係咪算難?

無啲咩m/e 91 benzene ring算係咁
化學艾維斯 2017-04-12 13:16:41
竟然俾晒提示話order of reaction唔一定整數

笑咗
可能啲人唔識log

咁中學level真係教開當得整數
不知鳥 2017-04-12 13:16:57
Kc係咪要加單位？
SUV 2017-04-12 13:17:44
覺唔覺今年份卷，感覺好長，好似寫極都未完咁
豬仔好傻 2017-04-12 13:17:48
竟然俾晒提示話order of reaction唔一定整數

笑咗
可能啲人唔識log

2.83???
2???
除唔盡ge

1.5


一樣
杰輝健身 2017-04-12 13:17:52
Lq 好多唔識
.👁. 2017-04-12 13:18:07
竟然俾晒提示話order of reaction唔一定整數

笑咗
可能啲人唔識log

2.83???
2???
除唔盡ge

1.5

d人讀chem唔識log就抵死啦
pH又log, Arrhenius又log
數學core又log
凡培漢斯 2017-04-12 13:18:42
conc. H2SO4
16.8 mol dm^-3
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