[DSE化學2018]同學準備好DSE CHEM未? (3)

唔該巴打

最後呢幾個鐘點温好

冷靜d 唔好自尋煩惱 準備左咁耐 呢幾個鐘都係睇下d實在野 例如marking 定義 解釋等等

應該每個topic 都快睇一次ce 定係係咁loop dse 好d

睇你自己覺得比較空虛果d topic囉
睇好 做就無謂

Hello想問下點由個energy-reaction coordinate 個graph睇出order of reaction?
同埋order of reaction 係咪睇個molecularity of rare determining step?

喺lab造nylon6.6
係咪將倒hexane-1,6-diamine落hexanedioic acid上面
再用rod喺佢哋contact area度捲啲nylon出嚟?
條式係咪 n HOOC(CH2)4COOH + n H2N(CH2)6NH2 -->
[OC(CH2)4CONH(CH2)6NH]n + (2n-1) H2O?

你係咪攪亂左 energy vs reaction coordinate係energy profile 睇Ea用
睇order係rate vs conc / conc vs time

yes

普通學校lab造 使唔使加catalyst(eg conc H2SO4)同heat?

通常heat都夠

想問係咪濃酸就腐蝕
稀酸就刺激性?你之前講過但唔係好記得

yes

Thanks
啊sir 聽日都要加油

請問Fe3+幾時係yellow brown 幾時係寫reddish brown

Fe3+(aq):yellow(brown?)
Fe3+既precipitate(e.g. Fe2O3): reddish brown

大家咁話 與你們同在

yellow in (aq)
brown in ppt such as Fe(OH)3

㨂訓教定㨂繼續温好

越溫越迷茫

最遲12點前好訓

可以唔洗

B?