Master Cambridge AS Level Chemistry (9701) with expert-backed tips, focusing on precision in physical chemistry calculations, exact organic mechanisms, and scoring maximum marks in Paper 3 practicals.
読了時間 5 分更新日: 2026年6月21日
試験の概要
試験数
3
満点
140
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
Paper 1 Multiple Choice
1時間 15分
40
40
31%
Multiple Choice
Paper 2 AS Level Structured Questions
1時間 15分
60
4
46%
Structured Question
Paper 3 Advanced Practical Skills
2時間
40
3
23%
Practical Task
評価段階
ABCDEU
電卓の規定
A silent scientific calculator is required where the syllabus permits one. It must NOT be graphical, programmable, or capable of symbolic algebra (CAS), and it must contain no stored programs or notes.
AO1: Knowledge with understanding (42%)
AO2: Handling, applying and evaluating information (35%)
AO3: Experimental skills and investigations (23%)
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
Table mode for roots & turning points
Scientific calculator (e.g. Casio fx-991 series)
目的: Tabulate \(y\) across a range of \(x\) to locate sign changes (roots) and approximate maxima/minima.
使う場面: Solving or sketching a function when you want to find where its graph crosses or turns.
手順
Enter the function in TABLE mode, set the start, end and step, then read where the sign of \(y\) changes or where it peaks.
試験での注意: Allowed, but the calculator must be silent, non-graphical, non-programmable and free of stored content; always show the working the mark scheme requires.
Statistics mode (mean, SD & regression)
Scientific calculator (e.g. Casio fx-991 series)
目的: Read the mean \(\bar{x}\) and standard deviation directly, and the gradient/intercept (and \(r\)) of a linear regression for bivariate data.
使う場面: Any data-handling, statistics, or required-practical analysis question.
手順
Enter the data in STAT mode (1-VAR or A+BX), then recall \(\bar{x}\), \(\sigma\) or the regression coefficients.
試験での注意: Allowed, but the calculator must be silent, non-graphical, non-programmable and free of stored content; always show the working the mark scheme requires.
Carry exact values with Ans & memory
Scientific calculator (e.g. Casio fx-991 series)
目的: Keep full-precision intermediate values to avoid rounding errors.
使う場面: Multi-step calculations where premature rounding loses the final accuracy mark.
手順
Use Ans, STO/RCL or the M+ memory to reuse the unrounded result of each step; round only the final answer.
試験での注意: Allowed, but the calculator must be silent, non-graphical, non-programmable and free of stored content; always show the working the mark scheme requires.
Equation solver — to CHECK your working
Scientific calculator (e.g. Casio fx-991 series)
目的: Use the built-in EQN/SOLVE mode to verify roots of quadratics or simultaneous equations you have already solved by algebra.
使う場面: As a check only, after solving by hand.
手順
Enter the coefficients in EQN mode (or use SOLVE) and confirm they match your worked solution.
試験での注意: Allowed, but the calculator must be silent, non-graphical, non-programmable and free of stored content; always show the working the mark scheme requires.
Failing to state 'per mole of water formed' when defining the standard enthalpy change of neutralisation.
回避方法: Always specify that the energy change is associated with the formation of exactly one mole of water from the neutralisation reaction of an acid and alkali under standard conditions.
Using the mass of solid solute instead of the total solution mass (i.e. volume converted to grams) in the thermal heat capacity calculation q = mcΔT.
回避方法: Identify the aqueous solution volume as the source of the mass (m) in the equation. For example, if adding solid to 25.0 cm³ of water/acid, use 25.0g as 'm', not the solid's mass.
3medium影響する配点: 1Ionisation energy (Atomic structure)
Omitting the gas state symbol '(g)' when defining or constructing balanced equations representing successive ionisation processes.
回避方法: Always write the gaseous state symbol for both the reactant and product species in ionisation energy equations (e.g. X(g) -> X+(g) + e-).
4high影響する配点: 1Reacting masses and volumes (of solutions and gases) (Atoms, molecules and stoichiometry)
Recording burette readings to only 1 decimal place instead of the required 2 decimal places (ending in .00 or .05) in titration files.
回避方法: Ensure every single initial and final burette reading in your results table ends in .00 or .05 (e.g., 22.10 cm³ or 22.15 cm³).
5medium影響する配点: 1Reacting masses and volumes (of solutions and gases) (Atoms, molecules and stoichiometry)
Failing to double the single reading uncertainty when calculating the percentage error for thermometers or mass balance measurements.
回避方法: Because mass-by-difference and temperature-change calculations involve two separate readings, multiply the maximum error of the apparatus by 2 before dividing by the experimental value.
6high影響する配点: 2Characteristic organic reactions (An introduction to AS Level organic chemistry)
Starting curly arrows in organic mechanisms from carbon nuclei or empty spaces instead of bonds or lone pairs.
回避方法: Position the start of your curly arrow precisely on a lone pair of electrons (e.g., on a nucleophile) or on the center of a bond (like a double bond or carbon-halogen bond) and end it precisely on the target atom.
Omitting explicit positive (+) or negative (-) signs from final calculated values of enthalpy changes.
回避方法: Always state the explicit mathematical sign for any thermodynamic value. For example, write -57.3 kJ/mol for an exothermic process, not just 57.3.