[DSE化學2018]同學準備好DSE CHEM未? (2)

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27 Like 8 Dislike
2018-03-13 22:13:49
2018-03-13 22:15:10
咁講啦
generally黎講溶得落水既metal oxide係會變hydroxide既
因為O2- react with H2O
O2- + H2O -> 2OH-
2018-03-13 22:17:10
all insoluble except gp I oxide
2018-03-14 18:42:57
深定淺咪又係咁考
2018-03-15 14:45:41
如果問點test saturated solution 我答加nacl睇下佢會唔會dissolve到under stirring 得唔得
2018-03-15 14:47:57
梗係唔得
叫得你test杯野係咪saturated即係下個step就做crystallization
個test唔可以affect個component / 耗用太多sample
2018-03-15 18:08:28
想讀醫嘅記住唔好一入大學就放低晒d chem concept
依家讀藥讀到死死吓,剩係鳩背,但唔識諗明佢
2018-03-15 18:15:54
想讀醫嘅記住唔好一入大學就放低晒d chem concept
依家讀藥讀到死死吓,剩係鳩背,但唔識諗明佢

Pharmacology 似Biochem 多過似chem wor (啲mechanism of action)
係啲pharmacokinetics 先似番啲chem
2018-03-15 18:18:46
thanks
2018-03-15 18:25:16
兩樣都差 不過你啱,整體係似biochem多啲
而我Biochem相對嚟講更加屎,真係唔知點搞
Btw DSE雞加油
2018-03-15 20:30:07
點解Aluminium oxides 會係amphoteric
2018-03-15 23:04:13
公開試黎講 HNO3分三個層次:very dilute/dilute/conc

very dilute HNO3 -> 當普通acid
+Zn -> H2
+Cu -> no reaction

dilute HNO3 -> oxidizing agent
+Zn -> NO
+Cu -> NO
NO then oxidize by air to give NO2 (brown gas)
2NO + O2 -> 2NO2

conc HNO3 -> strong oxidizing agent
+Zn -> NO2
+Cu -> NO2

Fe2+果個係special case黎 淨係會出NO
舊制AL叫做brown ring test 應該2007 AL後cut左 唔洗理
2018-03-15 23:05:14
同bonding有關
Al2O3其實係ionic bond + partial covalent bond
DSE唔洗考解釋
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