chem 問題.....

小莓。改

A lot of English supermen.
Should I join?

維記．鮮奶

其實我係唔識第39題.......

點解唔用得Ti,同埋(2)點解岩？

我知oxygen唔係易燃,
但係combustible唔係解燒得咩？

and then .....
想問下點分隻salt溶左係水後個pH係大過十1定係細過7？

REQUIEM

其實我係唔識第39題.......
308301
點解唔用得Ti,同埋(2)點解岩？

我知oxygen唔係易燃,
但係combustible唔係解燒得咩？

and then .....
想問下點分隻salt溶左係水後個pH係大過十1定係細過7？ ...
維記．鮮奶 發表於 29-4-2009 17:04

2岩 因為Na+ ion移左去negative pole果度

oxygen係助燃  純oxygen燒唔著既

基本上好似得metal oxide   同metal hydroxide溶水pH值大過7

小莓。改

樓上,那麼 NaHCO3 呢?

Zend

其實我係唔識第39題.......
308301
點解唔用得Ti,同埋(2)點解岩？

我知oxygen唔係易燃,
但係combustible唔係解燒得咩？

and then .....
想問下點分隻salt溶左係水後個pH係大過十1定係細過7？ ...
維記．鮮奶 發表於 29-4-2009 17:04

你想下金屬有咩情況下唔可以做ＥＬＥＣＴＲＯＤＥ　先

你話石油，木果Ｄ　就叫ＣＯＭＢＵＳＴＩＢＬＥ

ＯＸＹＧＥＮ，　一般情況下都係ＮＯＮ－ＣＯＭＢＵＳＴＩＢＬＥ

２　比人答左，　因為ＡＴＴＲＡＣＴＩＯＮ

３　你可以分開佢成酸同ＡＬＫＡＬＩ　果個
比較下個分別
Ｅ。Ｇ。　ＮａＣｌ　ｉＳ　ＮＥＵＴＲＡＬ
ＮａＯＨ　，　ＨＣｌ　ａｒｅ　ＳＴＲＯＮＧ　ＢＡＳＥ　ａｎｄ　ｓｔｒｏｎｇ　ａｃｉｄ

維記．鮮奶

你想下金屬有咩情況下唔可以做ＥＬＥＣＴＲＯＤＥ　先

你話石油，木果Ｄ　就叫ＣＯＭＢＵＳＴＩＢＬＥ

ＯＸＹＧＥＮ，　一般情況下都係ＮＯＮ－ＣＯＭＢＵＳＴＩＢＬＥ

２　比人答左，　因為ＡＴＴＲＡＣＴＩＯ ...
Zend 發表於 29-4-2009 17:24

同electrolyte/product react？

錦我就唔明了,
如果Na+係會比被吸去cathode既話,
錦點解電解水果陣,
係cathode,當H+走左,留低OH- , 點解OH- 唔會去番anode,而係留係cathode果度令到果度變alkali？

我淨係知solube base 係alkali-.-
例如NaHSO4  < 7  , Na2SO4 =7 , K2CO3 >7 ,
真係唔知點解......

Zend

我打中文次次都唔想轉英文MODE

1. yup, we usually use sth below Hydrogen in ECS ...Ti is above

2. different experiments... this is the ion migration,not electrolysis
你話會唔會走去,其實都會GA WOR,只係一去就比人用左JEI
(你都可以隔開佢的)
3. H2CO3 Vs KOH basic
2NaOH Vs H2SO4 , neutral
1NaOH Vs H2SO4, acidic
basically you can separate it to analyze..

小莓。改

I feel furious that I can't use pKa in CE...

Puppet

Check out what the term "comustion" means such that you can understand if O2 can be combusted or is combustible.

j32738

Check out what combustion is.
Actually the oxidising agent supports burning of a fuel, but they are not flammable / combustible.

Some molecules however contain both the "fuel" (hydrocarbon) and the  ...
Puppet 發表於 29-4-2009 16:18

我記得中三講過ｏｘｙｇｅｎ係oxidizing only~
right?