✔ 最佳答案
Q2
we won't pick out the C=O and say it is a carbonyl group because it is included in the C(=O)O this entire thing, which is considered as the ester group
i.e. we won't pick out part of a functional group and say the picked part is another functional group
2012-06-05 18:01:14 補充：
Just like carboxylic acid, -COOH,
you won't say it contains a hydroxyl group(-OH) and a carboxyl group, won't you?
Hope you understand what I'm saying.
2012-06-09 21:59:43 補充：
Not quite, because even in some books, TO MAKE STUDENTS UNDERSTAND,
they might say that "ester group = carbonyl group linked to an O-atom"
and similarily "carboxylic acid group = carbonyl group + hydroxyl group" etc.
which are all quite misleading
2012-06-15 12:43:51 補充：
去死la Ming, 系度呃分！
2012-06-15 13:23:53 補充：
圖片參考：
http://imgcld.yimg.com/8/n/HA00656648/o/701206040035113873410260.jpg
Hope my answer is much useful than the valueless ones. =]
2012-06-16 13:53:16 補充：
I think it is because its concern with the protective oxdie layer of Al.
But I would say reactions do occur.
For Al,
2Al + 6HCl --> 2AlCl3 + 3H2
For Al2O3,
Al2O3 + 6HCl --> 2AlCl3 +3H2O
But similar to Pb,
the product(AlCl3) formed a fine protective layer that hinder further reactions.
2012-06-16 13:56:19 補充：
I think the reason of saying there is no reaction is that the reactions only occur for short time and is not that observable.
And more importantly, it don't want to make things complicated.
