[DSE化學2018]同學準備好DSE CHEM未?

1001 回覆
89 Like 24 Dislike
2017-12-11 15:13:24
我想問AL term有咩分
e.g NaOH is hygroscopic
Dse marking就跟CE答absorb moisture in air

其實bio 我都有疑問
e.g thickened cell wall答lignified cell wall
順便係到問下 因為出面無bio post


有無分*
2017-12-11 16:41:36
我想問AL term有咩分
e.g NaOH is hygroscopic
Dse marking就跟CE答absorb moisture in air

其實bio 我都有疑問
e.g thickened cell wall答lignified cell wall
順便係到問下 因為出面無bio post

NaOH要寫deliquescent
如果唔識分hygroscopic同deliquescent就直接寫absorb moisture in air都ok

bio等高手答你啦
我自己無教開bio AL果d又唔記得曬
2017-12-11 19:12:27
我想問AL term有咩分
e.g NaOH is hygroscopic
Dse marking就跟CE答absorb moisture in air

其實bio 我都有疑問
e.g thickened cell wall答lignified cell wall
順便係到問下 因為出面無bio post

NaOH要寫deliquescent
如果唔識分hygroscopic同deliquescent就直接寫absorb moisture in air都ok

bio等高手答你啦
我自己無教開bio AL果d又唔記得曬


乜有分別嫁
中學miss教寫hygroscopic
另外巴打sba幾分
因為我係retaker,問黎參考下
2017-12-11 19:20:58
我想問AL term有咩分
e.g NaOH is hygroscopic
Dse marking就跟CE答absorb moisture in air

其實bio 我都有疑問
e.g thickened cell wall答lignified cell wall
順便係到問下 因為出面無bio post


有無分*

Lignified好似唔係講cell wall?係講成個植物?
(非AL 都想知)
2017-12-11 19:21:46
我想問AL term有咩分
e.g NaOH is hygroscopic
Dse marking就跟CE答absorb moisture in air

其實bio 我都有疑問
e.g thickened cell wall答lignified cell wall
順便係到問下 因為出面無bio post


有無分*

Lignify好似唔係講cell wall?係講植物嘅structure?
(非AL 都想知)
2017-12-11 19:27:33
我想問AL term有咩分
e.g NaOH is hygroscopic
Dse marking就跟CE答absorb moisture in air

其實bio 我都有疑問
e.g thickened cell wall答lignified cell wall
順便係到問下 因為出面無bio post

NaOH要寫deliquescent
如果唔識分hygroscopic同deliquescent就直接寫absorb moisture in air都ok

bio等高手答你啦
我自己無教開bio AL果d又唔記得曬


乜有分別嫁
中學miss教寫hygroscopic
另外巴打sba幾分
因為我係retaker,問黎參考下

deliquescent係吸水吸到變solution
勁過hygroscopic
好似係
2017-12-11 22:16:30
我想問AL term有咩分
e.g NaOH is hygroscopic
Dse marking就跟CE答absorb moisture in air

其實bio 我都有疑問
e.g thickened cell wall答lignified cell wall
順便係到問下 因為出面無bio post

NaOH要寫deliquescent
如果唔識分hygroscopic同deliquescent就直接寫absorb moisture in air都ok

bio等高手答你啦
我自己無教開bio AL果d又唔記得曬


乜有分別嫁
中學miss教寫hygroscopic
另外巴打sba幾分
因為我係retaker,問黎參考下

deliquescent係吸水吸到變solution
勁過hygroscopic
好似係

無錯 所以唔好亂寫
2017-12-11 22:50:40
點解NAOH 會吸water & co2?
有冇其他野類似係咁㗎

同水有強affinity既物質都會hygroscopic/deliquescent
例如CaCl2 CaO H2SO4 NaOH KOH
吸CO2通常係strong alkali
例如NaOH同KOH
因為CO2係acidic gas會比佢地中和
CO2 + 2OH- -> CO32- + H2O
2017-12-12 22:03:40
又推推
2017-12-13 12:45:14
點解NAOH 會吸water & co2?
有冇其他野類似係咁㗎

同水有強affinity既物質都會hygroscopic/deliquescent
例如CaCl2 CaO H2SO4 NaOH KOH
吸CO2通常係strong alkali
例如NaOH同KOH
因為CO2係acidic gas會比佢地中和
CO2 + 2OH- -> CO32- + H2O


同水有強affinity既物質都會hygroscopic/deliquescent

點樣可以知佢係咪? 中學雞

簡單講 中學level無
點都要記少量common example
H2SO4,NaOH 同埋其他drying agent (anhydrous CaCl2果d)
2017-12-13 15:39:19
究竟graphite係giant covalent structure定simple molecular structure
2012講係giant covalent
2013出張圖又畫到一層層好似simple molecular咁
2017-12-13 15:43:22
究竟graphite係giant covalent structure定simple molecular structure
2012講係giant covalent
2013出張圖又畫到一層層好似simple molecular咁

graphite應該唔屬於兩者任一
giant covalent : hard, no conductivity
simple molecular : low BP, no conductivity

graphite: soft, high BP, conductivity
淨係識用文字形容graphite 利申等人答
2017-12-13 15:52:10
究竟graphite係giant covalent structure定simple molecular structure
2012講係giant covalent
2013出張圖又畫到一層層好似simple molecular咁


2013同2014先岩
2017-12-13 17:24:34
究竟graphite係giant covalent structure定simple molecular structure
2012講係giant covalent
2013出張圖又畫到一層層好似simple molecular咁


2013同2014先岩


好似明左了⋯⋯
2017-12-13 17:27:25
究竟graphite係giant covalent structure定simple molecular structure
2012講係giant covalent
2013出張圖又畫到一層層好似simple molecular咁

graphite梗係giant covalent
你要理解”ginat”意指particles之間無止境地互相連結 形成一個3 dimensional network既結構

graphite係layer structure
layer之間的確係vdw force
但佢layer入面無數個C atom form bond with each other 同埋個packing highly regular
已經算係giant structure
2017-12-13 17:40:21
究竟graphite係giant covalent structure定simple molecular structure
2012講係giant covalent
2013出張圖又畫到一層層好似simple molecular咁

graphite梗係giant covalent
你要理解”ginat”意指particles之間無止境地互相連結 形成一個3 dimensional network既結構

graphite係layer structure
layer之間的確係vdw force
但佢layer入面無數個C atom form bond with each other 同埋個packing highly regular
已經算係giant structure

明白
2017-12-13 19:20:28
原本想讀chem後黎轉讀stat lm
2017-12-13 20:11:16
手頭上有唔少chem ge補習notes
有無巴打要?
請tg @Constantine1453 /ig dm dsenotesclearing
2017-12-15 18:51:38
2017-12-16 10:13:45
O Chem入面Organometal算唔算最難既topic

好見仁見智wor
邊個topic讀到上去都可以好難
2017-12-17 15:13:39
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