This expert guide offers evidence-based strategies, precise calculator techniques, and vital mark-scheme rules to excel in Oxford AQA International AS Level Chemistry (9620).
読了時間 4 分更新日: 2026年6月21日
試験の概要
試験数
3
満点
220
制限時間
4時間 30分
出題形式
3
試験
時間
配点
問題数
配点比率
出題形式
Unit 1: Inorganic 1 and Physical 1
1時間 30分
70
24
35%
Structured Short Answer, Mathematical Calculations, Tick-the-Box Multiple Choice
Unit 2: Organic 1 and Physical 1
1時間 30分
70
23
35%
Structured Short Answer & Drawing, Mathematical Calculations, Tick-the-Box Multiple Choice
Unit 3: Inorganic 2 and Physical 2
1時間 30分
80
26
30%
Structured Short Answer & Complexes, Mathematical Calculations, Tick-the-Box Multiple Choice
評価段階
A*ABCDEU
電卓の規定
A scientific or graphical calculator is permitted. Graphical calculators must be in exam mode with all stored programs and data cleared before the exam; the calculator must not be able to retrieve stored text or formulae.
過去問と採点基準にもとづいて作成（2023–2025）。
電卓プログラム
Graph: zeros, intersections & turning points
Graphical calculator / GDC (exam mode)
目的: Plot a function to read its roots (zeros), points of intersection, and maxima/minima.
使う場面: Checking solutions, sketching, or solving where an analytic method is hard.
手順
Graph the function(s) and use the built-in zero, intersect and maximum/minimum tools.
試験での注意: Allowed, but clear stored programs/data (graphical calculators in exam mode) and show the required working — unsupported calculator answers score no method marks.
Numerical equation solver
Graphical calculator / GDC (exam mode)
目的: Solve an equation or find a variable numerically when an algebraic route is long or implicit.
使う場面: Iterative or implicit equations, or to confirm an algebraic solution.
手順
Use the equation/zero solver, entering the equation and a sensible starting estimate.
試験での注意: Allowed, but clear stored programs/data (graphical calculators in exam mode) and show the required working — unsupported calculator answers score no method marks.
Numerical integration & differentiation
Graphical calculator / GDC (exam mode)
目的: Evaluate a definite integral \(\int_a^b f(x)\,dx\) or a gradient \(f'(x)\) at a point.
使う場面: Checking calculus answers, or where only a numerical value is needed.
手順
Use the GDC's numeric integral / derivative function with the limits or the point.
試験での注意: Allowed, but clear stored programs/data (graphical calculators in exam mode) and show the required working — unsupported calculator answers score no method marks.
Statistics & probability distributions
Graphical calculator / GDC (exam mode)
目的: 1-var/2-var statistics, linear regression, and cumulative binomial / normal / Poisson probabilities without tables.
使う場面: Statistics questions and hypothesis tests.
手順
Enter data in the statistics editor, or use the distribution menu (binomial cdf, normal cdf, …).
試験での注意: Allowed, but clear stored programs/data (graphical calculators in exam mode) and show the required working — unsupported calculator answers score no method marks.
よくあるミス
1high影響する配点: 2Atomic structure
Failing to convert molar mass from g/mol to kg/ion in TOF mass spectrometry calculations.
回避方法: Always divide the mass of a mole (g) by Avogadro's constant to find the mass of a single atom/ion, and then divide by 1000 to convert grams to kilograms (kg).
2high影響する配点: 1Introduction to organic chemistry
Drawing curly arrows that originate from the wrong focus point (such as a hydrogen atom or empty space).
回避方法: Ensure all curly arrows originate strictly from a lone pair of electrons or from the center of a covalent/double bond, pointing precisely to the atom forming the new bond.
3medium影響する配点: 1Chemical equilibria, Le Chatelier’s principle and Kc
Using round brackets instead of square brackets in equilibrium constant (Kc) expressions.
回避方法: Always use square brackets [ ] for Kc expressions. Round brackets represent mathematical grouping and will be completely penalized.
4high影響する配点: 1Energetics
Omitting state symbols in Born-Haber cycle diagrams or ionization energy equations.
回避方法: Double-check that all gaseous ions (e.g., Ba2+(g) or O2-(g)) have their state symbols explicitly written down, as examiners treat state symbols as essential.
5medium影響する配点: 2Amount of substance
Calculating the pH of a diprotic base (like barium hydroxide) without doubling the hydroxide ion concentration.
回避方法: Remember that Ba(OH)2 dissociates to release 2 moles of OH- ions per mole of base. Multiply the base concentration by 2 before calculating pOH or using Kw.