Mock for CE guys 2 (ans)

piyopiyo

原帖由 L.K. 於 28-4-2008 14:43 發表
葉神?....真定假

回復 38# 的帖子
升天
zend神(我真係好無聊)

葉神係真有其人[[tk_11]] 成鬼日整d 唔係人計ge數上泥

L.K.

[[tk_30]] 佢D POST 真係幾神..[[tk_30]]
http://www1.nakuz.com/bbs/viewth ... ght=%2B%B8%AD%AF%AB
http://www1.nakuz.com/bbs/viewth ... ght=%2B%B8%AD%AF%AB

Zend

我都好似見過這個人係古時的學術區出現[[tk_31]]

Puppet

原帖由 777kong 於 28-4-2008 14:17 發表
would u mind explain question 1 and 7?

#1 don't understand

#7 how can i know that it is a simple structure?

1.
Normal water contains all isotopes of H and O.
Of course it is a pure substance of the same thing.

Self-ionization of water H2O <---> H+ + OH-
There is D+ and 1H+ in water
There is D-O-1H in water
1H-D can be formed as hydrogen gas

7.
佢唔係無限延伸 => no a giant structure
Also, C60 is a molecule. Fullerenes exist as discrete molecules.

Puppet

原帖由 octopus001 於 28-4-2008 12:11 發表
我死的 岩岩做左  得幾條岩.. 聽日chem 冇希望 ..
救救me ....
Q2why D錯?
Q3WHY(1)錯?
Q9WHY(1)錯?
Q10(1)WHY是REDOX
Q14WHY B NOT A?
Q15WHY D? DELTA H

2. Neutral iff [H+] = [OH-]
pH of pure water < 7 at a temp. higher than room temperature.

3.
In groups I and II, the density of metal decreases down the group. Metallic bond strength decreases.

9. Dissolving salts is normally endothermic e.g. KI, NaCl

4.
Cond/Add 係polymerization模式的分法
Thermoplas/Thermoset係對熱soften與否的分法
冇人話Addition唔可以係thermoset

20. The water is formed from neutralization

[ 本帖最後由 Puppet 於 28-4-2008 21:00 編輯 ]