葉神?....真定假
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升天
zend神(我真係好無聊)
葉神係真有其人[] 成鬼日整d 唔係人計ge數上泥
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[] 佢D POST 真係幾神..[]http://www1.nakuz.com/bbs/viewthread.php?tid=2145007&highlight=%2B%B8%AD%AF%AB
http://www1.nakuz.com/bbs/viewthread.php?tid=2492938&highlight=%2B%B8%AD%AF%AB 我都好似見過這個人係古時的學術區出現[] 原帖由 777kong 於 28-4-2008 14:17 發表 http://www.nakuz.com/bbs/images/common/back.gif
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. 原帖由 octopus001 於 28-4-2008 12:11 發表 http://www.nakuz.com/bbs/images/common/back.gif
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 =
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 ]