HKDSE · 試験対策

Chemistry 試験対策

Master the HKDSE Chemistry compulsory and elective exams with our expert strategy guide. This package delivers high-yield insights on critical topics including Redox reactions, Chemical Kinetics, and Hess's Law, while resolving common examiner-reported pitfalls. Learn how to draft high-scoring structured answers and leverage your programmable calculator under HKEAA regulations to secure your level 5**.

読了時間 3 分更新日: 2026年6月21日

試験の概要

試験数
2
満点
162
制限時間
3時間 30分
出題形式
4
試験時間配点問題数配点比率出題形式
Paper 1 (Compulsory Part)2時間 30分1225060%Multiple Choice (MC), Short Answer Questions (SAQ), Structured/Calculation Questions
Paper 2 (Elective Part)1時間40220%Structured/Calculation Questions
評価段階
5**5*54321U
電卓の規定

Use only calculators on the HKEAA Approved List, bearing the 'H.K.E.A.A. APPROVED' (or older 'H.K.E.A. APPROVED') label. Programmable scientific models (e.g. Casio fx-50FH II, fx-3650P II) are allowed, and you MAY keep your own formulas/programs stored in memory — HKDSE does not require you to clear it. Graphic-display (graphing) and CAS/symbolic calculators are not on the approved list and must not be used.

  • AO1: To evaluate knowledge and understanding of chemical facts, principles and relationships. (40%)
  • AO2: To evaluate ability to apply chemical knowledge to unfamiliar situations and solve quantitative problems. (40%)
  • AO3: To evaluate experimental and investigative skills. (20%)

過去問と採点基準にもとづいて作成（2021–2025）。

電卓プログラム

Moles from Mass

Casio fx-50FH II / fx-3650P II (HKEAA-approved programmable)

目的: \(n=\dfrac{m}{M}\) (mass ÷ molar mass).

使う場面: Converting a mass into moles.

手順
Prompt m, M; outputs n.
プログラム
?→M:?→W:M÷W

試験での注意: M is the molar mass in g/mol from the periodic table.

Moles in Solution

Casio fx-50FH II / fx-3650P II (HKEAA-approved programmable)

目的: \(n=c\,V\) with V in litres (or \(cV/1000\) for mL).

使う場面: Titration and concentration calculations.

手順
Prompt c, V(mL); outputs moles.
プログラム
?→C:?→V:C V÷1000

試験での注意: Mind the volume units (L vs mL).

pH from [H⁺]

Casio fx-50FH II / fx-3650P II (HKEAA-approved programmable)

目的: \(\text{pH}=-\log_{10}[H^+]\).

使う場面: Acid/base concentration ↔ pH.

手順
Prompt [H⁺]; outputs pH.
プログラム
?→H:-log H

試験での注意: Use log (base 10), not ln.

よくあるミス

  1. 1high影響する配点: 1Redox Reactions & Electrolysis

    Stating Cu2+ is preferentially discharged at the cathode because 'it is a better oxidising agent' without any comparison.

    回避方法: Use explicit comparative language: 'Cu2+ is lower in the electrochemical series than H+ (or accepts electrons more readily than H+)'.
  2. 2medium影響する配点: 2Kinetics, activation energy & rate laws

    Drawing two different distribution curves on a Maxwell-Boltzmann diagram to show the effect of a catalyst.

    回避方法: Draw only one curve. Simply shift the activation energy line to the left (lower energy) to represent the catalysed pathway.
  3. 3medium影響する配点: 1Enthalpy Changes & Hess’s Law

    Omitting state symbols in thermochemical equations or Hess's Law cycles.

    回避方法: Always double-check and write correct state symbols (e.g., C6H14(l) vs C6H14(g), H2O(l) vs H2O(g)).
  4. 4medium影響する配点: 2Chemistry of Carbon Compounds (Inter-conversions)

    Drawing organic enantiomers as flat 2D structures or incorrectly aligning the tetrahedral chiral center.

    回避方法: Use proper tetrahedral wedge-and-dash representation (one wedge, one dash, and two in-plane lines) and reflect them exactly.
  5. 5medium影響する配点: 2Kinetics, activation energy & rate laws

    Calculating reaction rates or activation energy slopes in Paper 2 kinetics using arbitrary points on the best-fit line.

    回避方法: Strictly use the exact intersection coordinates marked by the dotted guidelines provided on the graph grid.
  6. 6medium影響する配点: 2Redox Reactions & Electrolysis

    Proceeding with stoichiometric calculations in reactions between Mg and N2 without establishing the limiting reactant.

    回避方法: Mathematically calculate the moles of all reactants first and state clearly which is in excess or limiting before computing product yield.

コツを高得点につなげよう

thinka は弱点を的確な演習に変え、即時採点と試験形式のフィードバックを提供します。より賢く、より短時間で。

無料で問題を解いてみる料金を見る

本番形式の問題を解いて、AIが即座に採点とフィードバック。

無料で問題を解いてみる