Terminated
2019-2-19 22:29:19
Tollen’s reagent + aldehyde 係咪一定要place the reaction mixture in a beaker of warm water做?點解?
另外,如果evaporate the reaction mixture to dryness,點解explosion may occur ?
蘋果解。綠茶
2019-2-20 02:09:33
想問下巴打
如果題目問 What is Hess Law
咁應該要答咩?
化學艾維斯
2019-2-20 02:11:32
definition
The overall enthalpy change of a reaction is independent of the reaction pathway.
平凡像我這一種
2019-2-20 07:28:24
oh 原來係問緊同一樣野
:^(
一杯凍檸茶
2019-2-20 18:27:15
想問下如果比較啲simple molecular structure 嘅element 同gp 0嘅element ,e.g. O2 and Ne
咁答molecular size of o2>molecular size of Ne , van der waals force between O2 molecules is greater than van der waals force between Ne atoms 定Ne molecules?
平凡像我這一種
2019-2-20 20:15:12
yes
一杯凍檸茶
2019-2-20 21:04:31
但應該寫between Ne atoms 定 Ne molecules?定兩個都啱
厹
2019-2-20 21:05:59
Ne molecules
因為Ne呢種情況叫mono-atomic molecule
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化學艾維斯
2019-2-20 21:30:06
原則上寫atom定molecule都無所謂 因為佢本質上可定義為atom or molecule (monatomic)
當然如果describe緊molecule既behavior 我自己傾向寫返molecule
山城25達
2019-2-21 20:36:41
solid Na2Co3 會5會dissolve in NaCl solution
的確係有energy produced per mass of fuel呢個reason
過往AL亦試過比數據你計enthalpy再比較