Chem 攻略
DSE CHEM 考試技巧十分重要!
Paper 1A 做卷時間分配攻略
完成時間：2小時30分鐘（即 150 分鐘）
結構 分數 佔比 時間分配
Paper 1 120 75%
Paper 1A 36 MC 45 min 每條75 sec /60 sec
Paper 1B 84 105 min
Paper 2 25% 60 min
第一圈: 20 min 先做1A秒殺題MC
做Paper 1B easy 題
第二圈補做1A分鐘題
補做1B 餘下較複雜題
覆核有冇信心題目
你要熟記以下equations
X2
Alkane -----------------------------> haloalkane
UV light / light / heat
H2
Alkene -----------------------------> alkane
Pt, Ni or Pd
OH-(aq)
Haloalkane ----------------------------->alcohol
NaBH4(aq)
Ketone or aldehyde -----------------------------> alcohol
NH3 . heat
Carboxylic acid -----------------------------> unsubsitituted amide
OH-(aq), heat H+(aq)
Ester -----------------------------> carboxylate + alcohol -----------------------------> carboxylic acid
OH-(aq), heat H+(aq), heat
N-substituted amide -----------------------> carboxylate + alkylamine -------------------> carboxylic acid + alkylammonium salt
OH-(aq), heat H+(aq), heat
Unsubstituted amide ---------------------> carboxylate + ammonia ----------------------> carboxylic acid + ammonium salt
H+(aq)
N-substituted amide -----------------------------> carboxylic acid + alkylammonium salt
H+(aq), heat
Unsubstituted amide -----------------------------> carboxylic acid + ammonium salt
唔好記漏 唔駛你記
substitution reaction of alkane chemical equations electron diagrams
diagrams
polar explain polar/non-polar nature of molecules with reference to EA partial charges
polarity of bonds and molecular shape
application of electrolysis: electroplating of Cu purification of Cu
enthalpy change definition of heat change under constant pressure describe / relate with heat change
soaps, soapless detergents: structure, steps to produce in laboratory cleaning ability of soaps vs soapless detergents in hard water
vitamin C demand / need to produce industrially Industrial manufacturing process
catalyst definition, common examples homogeneous vs heterogeneous
chloroalkali industry flowing mercury cell, membrane cell diaphragm cell
知就得，唔駛記
classification of van der Waals’ forces
bond angle of molecule shape
C60 structure and use
Zn-C cell
Contact Process
structures of glucose and fructose, functional groups in fats, oils and polypeptides
industrial manufacturing process of acetic acid
criteria for choosing Chemical plant site
steps, calculations of Volumetric analysis
如果Chem 操卷的題目冇以下特色，隨時死做爛做，都係原地踏步。
加強
Flow chart 型 重cross over思維
實驗 + 應用型 實驗理論
實驗中五官可感受的改變
Balance equation atom electron charge
結構圖
畫圖
計算
實驗 + 公式 + Calculation 計算及單位轉換
平衡化學式
用物態符號推算原子、離子數目
Distinguish 型 gas bubble
colour
ppt or dissolve
你應該如此操卷：
操卷期間，要專心對卷、不要揾google大神或者筆記，直到timer 響起為止！
做卷後，細心對Marking Scheme，留意 keywords
電子紀錄錯題並重溫
調整溫習策略⠀操卷 --> 發現弱項topic --> 重温該topic --> 再操卷
最後記住要對自己有要求。其實只要你願意，攞5級話咁易。
亂喼當秘笈，還是秘笈當亂喼，都是你的選擇。
如果同學想借助外力，水平上昇再上升，或者想操有質素的模擬卷，有人幫忙批卷和如何從操練中學習keywords，可以與劉sir 聯絡。
如有查詢或預約上堂：請 WhatsApp 6308 3327 劉sir教室