This guide provides expert exam tips, structural details, and a breakdown of common mistakes for Oxford AQA International A-level Chemistry (9620) to help students maximize their marks across all five units.
Short Answer / Structural Drawing, Mathematical Calculation, Multiple Choice
評価段階
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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.
AO1: AO1: Knowledge and understanding of scientific ideas, processes, techniques and procedures (35%)
AO2: AO2: Application of knowledge and understanding to unfamiliar situations, qualitative and quantitative contexts (40%)
AO3: AO3: Analysis and evaluation of scientific information, experimental design and practical procedures (25%)
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: 2Introduction to organic chemistry (Organic chemistry)
Drawing curly arrows that do not originate exactly from a lone pair of electrons or a bond, but rather start from empty space or from an atom label.
回避方法: Ensure the tail of the curly arrow begins precisely on the double bond or the lone pair of the nucleophile/electrophile and points directly to the atom receiving the electrons.
2high影響する配点: 1Amount of substance (Physical chemistry)
Failing to convert the volume of gas from cm3 to m3 (or dm3 to m3) when using the Ideal Gas Equation (PV = nRT).
回避方法: Always multiply the volume in cm3 by 10^-6 to convert to m3 before substituting it into the equation.
Omitting essential state symbols in Born-Haber cycles or when writing equations for first/second ionization energy.
回避方法: Always write down state symbols, paying special attention to gaseous states (g) for atoms and ions when defining ionization energies or lattice enthalpies.
Describing recrystallisation procedures without mentioning that the minimum volume of solvent must be used, or using a Bunsen burner instead of a water bath for flammable mixtures.
回避方法: Always state 'dissolve the solid in the minimum volume of hot solvent' and specify heating with a water bath when solvents are flammable.
7medium影響する配点: 1Alcohols (Organic chemistry)
Improperly drawing vertical bonds to functional groups (e.g. connecting a carbon-carbon vertical chain directly to the H of an OH group rather than the O atom).
回避方法: Ensure vertical bonds explicitly touch the atom that forms the bridge (e.g., C-O-H, not C-H-O) in structural diagrams.