Master the rigorous requirements of Cambridge International A Level Chemistry (9701). This evidence-based guide reveals standard exam pitfalls, practical errors in Paper 3, high-yield organic reaction mechanisms, thermodynamic state symbol requirements, and systematic calculation structures to secure a top grade.
阅读时间 4 分钟更新于: 2026年6月21日
试卷概览
卷数
5
总分
270
考试时间
7小时 45分钟
题型
5
试卷
时间
分数
题数
比重
题型
Paper 1 (Multiple Choice)
1小时 15分钟
40
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—
—
Paper 2 (AS Level Structured Questions)
1小时 15分钟
60
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—
—
Paper 3 (Advanced Practical Skills)
2小时
40
—
—
—
Paper 4 (A Level Structured Questions)
2小时
100
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—
—
Paper 5 (Planning, Analysis and Evaluation)
1小时 15分钟
30
—
—
—
评级
A*ABCDEU
计算器规定
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%)
根据历届试题与评分标准整理（2023–2025）。
计算器程序
Table mode for roots & turning points
Scientific calculator (e.g. Casio fx-991 series)
用途: Tabulate \(y\) across a range of \(x\) to locate sign changes (roots) and approximate maxima/minima.
使用时机: Solving or sketching a function when you want to find where its graph crosses or turns.
步骤
Enter the function in TABLE mode, set the start, end and step, then read where the sign of \(y\) changes or where it peaks.
考试提示: 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)
用途: Read the mean \(\bar{x}\) and standard deviation directly, and the gradient/intercept (and \(r\)) of a linear regression for bivariate data.
使用时机: Any data-handling, statistics, or required-practical analysis question.
步骤
Enter the data in STAT mode (1-VAR or A+BX), then recall \(\bar{x}\), \(\sigma\) or the regression coefficients.
考试提示: 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)
用途: Keep full-precision intermediate values to avoid rounding errors.
使用时机: Multi-step calculations where premature rounding loses the final accuracy mark.
步骤
Use Ans, STO/RCL or the M+ memory to reuse the unrounded result of each step; round only the final answer.
考试提示: 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)
用途: Use the built-in EQN/SOLVE mode to verify roots of quadratics or simultaneous equations you have already solved by algebra.
使用时机: As a check only, after solving by hand.
步骤
Enter the coefficients in EQN mode (or use SOLVE) and confirm they match your worked solution.
考试提示: Allowed, but the calculator must be silent, non-graphical, non-programmable and free of stored content; always show the working the mark scheme requires.
常见错误
1high涉及分数: 1An introduction to A Level organic chemistry
Writing 'duplet' or 'quadret' instead of 'doublet' or 'quartet' for proton NMR splitting patterns.
如何避免: Ensure you strictly memorize and use the standard IUPAC terms: singlet, doublet, triplet, quartet, and multiplet.
2high涉及分数: 1Atomic structure
Omitting gaseous state symbols (g) when writing chemical equations representing first or successive ionization energies.
如何避免: Always include gaseous state symbols on both the reactant and product sides of the equation (e.g., Na(g) -> Na+(g) + e-).
Using the mass of the added solid reactant instead of the total solution mass in calorimetry calculations (q = mcT).
如何避免: Use the volume of the solution (converted to grams, e.g., 20.0g for 20.0 cm³ of aqueous acid) as the mass variable 'm' in your formula, as it is the solution absorbing/releasing the heat.
4high涉及分数: 2Characteristic organic reactions
Drawing mechanism curly arrows that originate from general areas, from a hydrogen atom, or pointing to incorrect atoms.
如何避免: Curly arrows must originate precisely from a lone pair of electrons or from the center of a specific covalent bond and terminate exactly on the electron-accepting atom.
5medium涉及分数: 1Atoms, molecules and stoichiometry
Forgetting to multiply the apparatus uncertainty by 2 when calculating percentage error for values determined by two separate readings (such as temperature differences or delivered burette volumes).
如何避免: Double the single-reading absolute uncertainty in the numerator before dividing by the volume or temperature change measured.
6medium涉及分数: 1Equilibria (Physical chemistry (A Level))
Rounding decimals prematurely during multi-step quantitative calculations, leading to rounding discrepancies in the final reported figure.
如何避免: Keep the exact calculated intermediate values stored in the calculator memory, perform final calculations on the unrounded figures, and round only the final reported answer to 3 significant figures (or as requested).