雞蛋浸醋兩日,扔落地唔會爛? 20點

Yes. The egg must be cooked, absolutely! An uncooked egg is in liquid state!! We can't do this experiment when the egg is in liquid state!

Dip a cooked egg into vinegar is OK for this experiment because calcium carbonate in the egg shell have reaction with acids. The egg won't be broken when thrown onto the ground. And the vinegar is acidic, it will have a positive result.(All kinds of vinegar is OK for this experiment.)
任何一種醋都可以的!!

2011-08-29 18:30:24 補充：
冇準確話幾多日，浸到o的蛋殼冇哂為止。你要定時觀察，醋中沒氣泡就可以做了。

蛋殼係CaCO3
醋係CH3CH2OH (monobasic acid)

如果你將佢地放埋一齊

2H+ + CaCO3 -> Ca2+ + H2O + CO2
所以你會見到colourless gas bubbles form係隻蛋蛋表面

至於生定熟 我覺得都應該係熟
因為最後個shell會軟化左
如果入面係solid
你就好似玩緊彈彈波
入面係liquid..... 就好似玩緊自己咁- -
可能會爆/變形->爆