chem 高手請入

依d 19題目黎黎去去都係個org chem conversion table
得果十個8個condition同埋path你好心就記撚左佢啦大佬
考dse你記撚左佢點轉,寫埋catalysis已經有分
點畫果d問呀sir拎d rules玩下,睇多D就識
btw你咩都唔記,咁懶,炒撚硬
兩個大topic都唔識 redox org chem
redox d野再撈埋acid & base
org chem撈埋weak acid base calculation睇你點玩

樓主依家online可以做多d pp, 記下table

呢條mc唔使咁複雜，見到sulphite遇到屈機oxidizing agent, 就一定轉綠色，揀佢冇錯。

if you want to use RA to explain, you need to write
“chloride is a WEAKER reducing agent than Cr3+”
(why Cr3+ instead of Cr2O7 2-? Because Cr2O7 2- is NOT an RA. Confused? Then just use position of ECS to explain.)

sorry, should be Cr3+ is a weaker RA than Cl-.

連登真係高手如雲
關於如果用position of ECS explain, 有個寫法問題
假如電解CuSO4, Cu reduced at cathode.
個解釋寫法係
1) Copper is at lower than Hydrogen at ECS position
2) Cu2+ ion is at lower than H+ ion at ECS position
3) Cu is at lower than H2 at ECS position
其實是否都accept. 睇marking 年年唔同.

preferrentially discharge嘅題目嚟
一般有3個factor Molarity, ECS position, Nature of electrode
共勉

你b 會turn moist blue litmus paper red 再變white wor

整多條

答案係colorimetry / IR spectroscopy
係咪出錯左
R晒頭 formaldehyde 唔係colorless 架咩

我知,只係同樓主講下呢類題目有咩factors要考慮,多謝ching指教

冇錯

尤其係colorimetry 不過要加其他chemical
或者到佢gas phase voc 咁做

有啲酒精呼氣測試都係用呢個原理

繼續

想問ii) Marking就咁warm with AgNO3
點解直接會有reaction.

雖然知正路係加NaOH 再加 H+/ AgNO3
但如果warm with AgNO3 directly都做到…

(ii) Benzyl halide 會容易d做substitution
(probably via Sn1 substitution)
所以就咁用Ag(NO3) (aq) 個H2O同warm

就可以打走個halide 出precipitates

但你個答法應該最正路

thx

thx

Benzyl halides will undergo Sn1 readily, as the intermediate carbocation is stabilized by the benzyl group (resonance effect, not DSE chem involved). Therefore, the leaving halogen groups are readily removed and precipitate with Ag+