高手入黎幫我清清d問題
1. dipole attraction係唔係intermoleculer force?2. theoretically Na 同Ca 邊個可以displace邊個?
3. gamma-Al2O3點解唔會有alpha-Al2O3 0既保護作用?
4. in addition polymerization, 係唔係用左catalyst, d molecule就一定會同一個方向polymerize?
i.e.
nC2H3Cl--->---CH2CHClCH2CHClCH2CHCl---
而唔會
nC2H3Cl--->---CH2CHClCHClCH2CH2CHCl---
5. In eletrolysis of molten Al2O3,
why use graphite anode when oxygen will oxidize the rods?
Because other materials will melt/be oxided as well?
聽日溫哂會再加多d問題
幫幫手唔該....
[ 本帖最後由 bunbunbunbun 於 27-4-2008 11:56 編輯 ] 1. 係.
intermolecular force 有3種
dipole-dipole
dipole-induced dipole
induced dipole - induced dipole
2. more reactive displace less reactive
but the position in ECS is reversed ( 好似 )
3/4/5 由 Zend 黎啦. 失憶喇 正當以為我識答Q.5 ge時候
我發現我睇唔明樓主想問咩[]
你係咪想問點解O2 可以oxidize 枝rods 果陣要用graphite泥做anode[]
對,好高溫,會oxidize[] 回復 2# 的帖子
1.Van de Waals' force係唔係其中一種?
2.就係咁= =
reverse左好搞亂
原帖由 piyopiyo 於 27-4-2008 13:52 發表 http://www1.nakuz.com/bbs/images/common/back.gif
正當以為我識答Q.5 ge時候
我發現我睇唔明樓主想問咩[]
你係咪想問點解O2 可以oxidize 枝rods 果陣要用graphite泥做anode[]
對,好高溫,會oxidize[]
簡單d問點解唔用Pt?
[ 本帖最後由 bunbunbunbun 於 27-4-2008 15:08 編輯 ] 1. intermolecular forces 入面的van der Waals' forces 先係有
dipole-dipole
dipole-induced dipole/induce dipole-dipole
instantaneous -induced dipole
ion-dipole(water+Na+ , water +Cl-)2. 你了解下E.C.S 點來就知有無可能發生=.=
theoretically, Na replaces Ca2+.
3.這個同問graphite Vs diamond, 點解diamond 要極高溫(700-900'C, 某程度上要加壓)先燒到佢變CO2, 而charcoal , graphite 係in an order of ascending flash pt ...
4. 這個是AL 的free radical addition reaction,涉及左radical ge stability, 這點我信唔會係CE 考=.= 過多1,2年再學啦
5. 係用graphite, 你唔好擔心佢電流過大/會被oxidized 問題 =~=
知個process 就得 唔係O2 會attack carbon electrode ga咩?
我唔知睇咩睇返黎ga wo 一.一 原帖由 octopus001 於 27-4-2008 03:16 PM 發表 http://www.nakuz.com/bbs/images/common/back.gif
唔係O2 會attack carbon electrode ga咩?
我唔知睇咩睇返黎ga wo 一.一
等我又引用 果句:
不要問, 只要信[] 回復 5# 的帖子
嗯嗯...
唔該哂
-------------
可唔可以概括咁講下catalyst點provide alternative activation energy?
IUPAC name of CH3CH(CH3)CHOHCH3
係3-methylbutan-2-ol定2-methylbutan-3-ol ?
(個numbering preference係點分?)
PVC既然係poisonous
做raincoat/handbag唔會對人體有害咩?
係唔係燒Na時有plentyful O2就出NaO2
一般就出Na2O2
少就出Na2O
??
[ 本帖最後由 bunbunbunbun 於 27-4-2008 15:44 編輯 ] For alkanols...the smaller number is given to the C which bonds with OH[] 科學家未有定論
但一般做catalyst 都係transition metals
佢地可以幫手增加effective collisions, 包括拉近molecules 距離 by adsorption
包括weaken 兩隻的bond,(e.g. in Haber process, 最難過係N2->2N ne 個我地叫rate-determining step 的東東,因為N三N太難break)包括有low-lying vacant d orbitals 去比佢attract ,甚至係做electron transfer , 一切都係等你讀A-level 先看
PVC 同VC 唔同chemical properties
你驚係驚佢有d unpolymerized ge VC 殘留係表面, 又或者佢會分解
raincoat / aritifical ge leather 做的手袋都唔係好驚
PVC 通常做drain water ge pipe, 如果做drinking water 我信是比較少
IUPAC, 無記錯相同數字... 時候, 我估係-2-ol好d
Na, 你燒佢都基本上出d Na2O2 出來,
但pure oxygen or high conc of O2 ,加熱效果更佳
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