有d野要問下

piyopiyo

原帖由 L.K. 於 13-4-2008 13:54 發表
用DATA LOGER最好....

data loger 都係要同pH meter 混合泥用...

Zend

原帖由 L.K. 於 13-4-2008 05:54 發表
用DATA LOGER最好....

data-logger 係部record data 的野
你需要另外整d instruments 去做, 都唔平

但只用pH meter 平好多 lol

frankie172002

原帖由 Zend 於 13-4-2008 13:46 發表
1. OA 係過程中會有Drop/decrease in O.S
2. catalyst 係speed up/slow down 一個chemical reaction, 而佢at the end of reaction 係無chemically changed

我會用pH meter, 又快又方便

催化劑可slow down個反應<-----而家先知~_~
突然做做下題目又有野要問,唔想開新帖人
我想問下假如催化劑催化果個係可逆反應,咁樣係咪會同時speed up/slow down個正反應同逆反應?

piyopiyo

原帖由 frankie172002 於 13-4-2008 15:17 發表


催化劑可slow down個反應

錯![[tk_34]]

Catalyst 分2種,positive 同 negative...
positive speed up, vice versa

唔係1隻catalyst同時speed up/slow down[[tk_30]]

frankie172002

原帖由 piyopiyo 於 13-4-2008 15:23 發表

錯![[tk_34]]

Catalyst 分2種,positive 同 negative...
positive speed up, vice versa

唔係1隻catalyst同時speed up/slow down[[tk_30]]

catalyst 係speed up/slow down 一個chemical reaction, 而佢at the end of reaction 係無chemically changed
樓上有人咁講既~_~

piyopiyo

原帖由 frankie172002 於 13-4-2008 15:30 發表


catalyst 係speed up/slow down 一個chemical reaction, 而佢at the end of reaction 係無chemically changed
樓上有人咁講既~_~

catalyst係用泥 speed up 或者 slow down 個reaction...
當個catalyst係個reaction係 positive catalyst,佢就  只會   speed up...vice versa
唔係同時speed up 同埋 slow down [[tk_30]]

Puppet

原帖由 piyopiyo 於 13-4-2008 15:32 發表

catalyst係用泥 speed up 或者 slow down 個reaction...
當個catalyst係個reaction係 positive catalyst,佢就  只會   speed up...vice versa
唔係同時speed up 同埋 slow down [[tk_30]]

He is thinking about this
For a reversible catalysed reaction, will the cat. catalyse the backward reaction (= slow down forward reaction)?

This is okay, bacause, the net effect can still be to speed up the reaction.

Enzymes are an example.

frankie172002

原帖由 Puppet 於 13-4-2008 15:46 發表

He is thinking about this
For a reversible catalysed reaction, will the cat. catalyse the backward reaction (= slow down forward reaction)?

This is okay, bacause, the net effect can still be to  ...

得你明白我個問題[[bao_29]],多謝你既解答

Zend

both forward and backward reactions speed up /slow down
catalysts can be classifiied in terms of its use.  but in most cases, positive catalysts are used to "increase the yield" in industrial view...

天劍．雷伊

原帖由 frankie172002 於 12-4-2008 22:19 發表


1.點解我本書寫係用氧化劑既?[]
   本書既例子
   丙-1-醇+[O]+H2O--->丙-1,2二醇
   同埋我本書冇提過你講既野,我剩係做pp見過,會考都要考埋?
2.通用指示劑由淺綠色變成藍色
   有咩提示係當溶液係鹼性,指 ...

答番樓上中文問ge問題
1.你本書個例子係由烯烴變成有2個相同官能基(羥基)ge醇
而唔係1個官能基ge醇

(正向)催化劑對可逆反應ge影響要係AL化學先考......

話說(正向)催化劑唔會影響可逆反應ge平衡位置(即兩面ge產量不變)