AQA AS Chemistry Insert 2 (Jan 2022): Data Sheet Decoded | AQA AS化学 2022年1月附录2：数据表解读

📚 AQA AS Chemistry Insert 2 (Jan 2022): Data Sheet Decoded | AQA AS化学 2022年1月附录2：数据表解读

In the AQA AS Chemistry January 2022 examination, Insert 2 contains the official data sheet – a set of physical constants, thermodynamic values and periodic trends that candidates must use to solve numerical and analytical problems. This article breaks down every part of that insert, explains when and how to apply each value, and gives you a clear revision roadmap for data-driven questions.

在 AQA AS 化学 2022 年 1 月考试中，附录2 提供官方数据表，包含一系列物理常数、热力学数值和周期趋势。考生需要利用这些数据来解决计算和分析题。本文逐项解读该数据表的每一部分，说明何时以及如何使用每个数据，并为你提供应对数据类考题的清晰复习路线。

1. Overview of Insert 2 | 附录2概览

Insert 2 in the AQA AS Chemistry paper is a printed A4 leaflet containing numerical data that supports qualitative and quantitative questions. It is not a summary of the whole specification; rather, it is a reference tool. You will receive it for both Paper 1 and Paper 2, so you must know how to navigate it quickly and accurately.

AQA AS 化学试卷中的附录2 是一份印刷的 A4 数据页，提供支持定性和定量题目的数值数据。它不是整个考纲的总结，而是一个参考工具。Paper 1 和 Paper 2 都会附带它，因此你必须学会快速、准确地查找数据。

The insert typically includes: physical constants (Avogadro constant, gas constant, Faraday constant, specific heat capacity), ionisation energy data, bond enthalpy values, and sometimes standard electrode potentials for A-level units. For AS-level, the focus is on the first few blocks of the data sheet.

附录通常包括：物理常数（阿伏加德罗常数、气体常数、法拉第常数、比热容）、电离能数据、键焓值，有时在 A-level 部分还包含标准电极电势。对于 AS 阶段，重点是数据表的前几部分。

2. Key Physical Constants | 关键物理常数

The most frequently used constants in AS Chemistry are the Avogadro constant 6.02 × 10²³ mol⁻¹, the gas constant 8.31 J mol⁻¹ K⁻¹, the Faraday constant 9.65 × 10⁴ C mol⁻¹ and the specific heat capacity of water 4.18 J g⁻¹ K⁻¹. You will be expected to recall these from memory, but the insert provides them for reassurance.

AS 化学中最常用的常数是阿伏加德罗常数 6.02 × 10²³ mol⁻¹、气体常数 8.31 J mol⁻¹ K⁻¹、法拉第常数 9.65 × 10⁴ C mol⁻¹ 以及水的比热容 4.18 J g⁻¹ K⁻¹。这些通常需要你记忆，但附录中也会印出，为你提供保证。

pV = nRT ΔT = q / (mc) Q = It = F × n(e⁻)

Notice that each constant links directly to a key equation. For example, the gas constant appears in the ideal gas equation to find the amount or volume of a gas. The Faraday constant appears whenever you calculate charge passed during electrolysis. The specific heat capacity is central to calorimetry calculations.

注意每个常数都直接与一个关键方程相联系。例如，气体常数出现在理想气体方程中，用于计算气体的物质的量或体积。法拉第常数在计算电解过程中通过的电量时出现。比热容则是量热学计算的核心。

3. The Periodic Table and Nuclear Data | 周期表与核数据

Although Insert 1 usually contains the full Periodic Table, Insert 2 sometimes lists relative atomic masses (Aᵣ) and atomic numbers of selected elements. For AS questions on mass spectrometry or moles, you may need the exact Aᵣ values rather than rounding from the periodic table.

虽然附录1通常包含完整元素周期表，但附录2有时会列出所选元素的相对原子质量（Aᵣ）和原子序数。对于涉及质谱或物质的量的 AS 试题，你可能需要使用精确的 Aᵣ 值，而不是从周期表中粗略估算。

For instance, chlorine has an Aᵣ of 35.5 due to its two isotopes. The insert may remind you of this to prevent common mistakes in mole calculations. Always check the data sheet before rounding any atomic mass to a whole number.

例如，氯因有两种同位素而具有 35.5 的相对原子质量。附录可能会提醒你这一点，以避免在摩尔计算中出现常见错误。在将任何原子质量四舍五入为整数之前，务必先查看数据表。

4. Ionisation Energies | 电离能

AQA AS Chemistry Insert 2 often includes a table of successive ionisation energies for elements in period 2 and 3. The first ionisation energy, second ionisation energy, and so on can be used to deduce the number of electrons in each shell, the group number and the electron configuration.

AQA AS 化学附录2 通常包含第2、3周期元素的逐级电离能表格。第一电离能、第二电离能等可用于推断每个壳层中的电子数、族序数和电子构型。

Example pattern: If the first and second ionisation energies are close, but the third is much larger, the element has two outer electrons; it is in Group 2. This sudden huge increase indicates a change from the outer shell to the next inner shell.

示例规律：如果第一和第二电离能相近，而第三电离能突然大幅增大，则该元素有两个价电子，属于第2族。这种巨大的跳跃表明从最外层跨越到次内层电子壳层。

Mg(g) → Mg⁺(g) + e⁻ ΔH₁ᵢ = 738 kJ mol⁻¹
Mg⁺(g) → Mg²⁺(g) + e⁻ ΔH₂ᵢ = 1451 kJ mol⁻¹

When answering questions, remember that the insert gives values in kJ mol⁻¹, not MeV or eV. Also, be careful to write the correct state symbols – ionisation energies always refer to gaseous atoms and gaseous ions.

答题时请注意，附录给出的单位是 kJ mol⁻¹，而不是 MeV 或 eV。同时，务必写对状态符号——电离能总是针对气态原子和气态离子。

5. Enthalpy and Calorimetry Data | 焓变与量热数据

The data sheet provides standard enthalpy of formation (ΔHf°) and standard enthalpy of combustion (ΔHc°) for common substances. These values enable you to calculate enthalpy changes using Hess’s law, especially when direct measurement is impossible.

数据表提供常见物质的标准摩尔生成焓（ΔHf°）和标准摩尔燃烧焓（ΔHc°）。这些数值使你能够利用赫斯定律计算焓变，尤其是在无法直接测量时。

For example, to calculate the enthalpy of reaction, you can use the equation:

ΔHr° = ΣΔHf°(products) – ΣΔHf°(reactants)

Alternatively, with combustion data:

ΔHr° = ΣΔHc°(reactants) – ΣΔHc°(products)

Calorimetry questions will give you the temperature change, mass of water, and often the specific heat capacity from the insert. The equation q = mcΔT returns the energy change in joules; remember to convert to kJ and adjust for the number of moles used.

量热学题目会给出温度变化、水的质量，并通常提供附录中的比热容。公式 q = mcΔT 得到以焦耳为单位的能量变化；注意要转换为千焦，并根据所用物质的量进行调整。

6. Bond Enthalpy and Electronegativity | 键焓与电负性

Another column on Insert 2 contains average (mean) bond enthalpy values for covalent bonds such as C–H, O–H, C=C, etc. These are useful for estimating reaction enthalpies when only structural formulas are given.

附录2 中还有一列内容，包含共价键的平均（或平均标准）键焓值，如 C–H、O–H、C=C 等。这些数据在只给出结构式时可用于估算反应焓变。

To use bond enthalpies, add up all bonds broken in the reactants and subtract all bonds formed in the products:

ΔH = Σ(bonds broken) – Σ(bonds formed)

The insert may also list Pauling electronegativity values for elements. These help you predict bond polarity – a larger difference in electronegativity means a more polar covalent bond. This is essential for explaining intermolecular forces and reactivity.

附录还可能列出鲍林电负性值。这些值帮助你预测键的极性——电负性相差越大，共价键的极性越强。这对于解释分子间作用力和反应活性至关重要。

7. Acid–Base Equilibria Data | 酸碱平衡数据

For AS-level, the insert sometimes includes selected acid dissociation constants (Ka) and pKa values. These appear in questions about weak acids, pH calculations and buffer solutions. Even though the formula sheet does not list every equation, the constants allow you to apply them.

在 AS 阶段，附录有时会包含部分酸的解离常数（Ka）和 pKa 值。这些数据出现在涉及弱酸、pH 计算和缓冲溶液的题目中。虽然公式表不列出每个方程，但常数可供你直接使用。

Ka = [H⁺][A⁻] / [HA] pH = –log₁₀[H⁺]

Always check the units of Ka. They are usually mol dm⁻³, but when concentration appears without units, remember that Ka for weak acids is numerically equal to [H⁺]² / [acid]. The insert may give you a shorthand way to calculate pH for weak acids.

始终检查 Ka 的单位。它们通常是 mol dm⁻³，但如果没有浓度单位，请记住弱酸的 Ka 在数值上等于 [H⁺]² / [酸浓度]。附录可能为你提供了计算弱酸 pH 的简化方法。

8. Data Interpretation Strategy | 数据解读策略

Many candidates lose marks not because they don’t know chemistry, but because they misread the data sheet. A structured strategy is vital:

许多考生失分不是因为不懂化学，而是因为看错数据表。制定系统的查阅策略至关重要：

Read the question first; identify what quantity is required.
Read the question first; identify what quantity is required.
Check whether the question gives you a value that is also on the insert – do not re-calculate a constant.
Write down the relevant equation before substituting values.
Track units: convert kJ ↔ J, dm³ ↔ m³, and °C ↔ K when necessary.

先读题，确定所需计算的量。
检查题目给出的数值是否已在附录中——不要重新计算常数。
代入数值前先写出相关方程式。
注意单位换算：kJ 与 J、dm³ 与 m³、°C 与 K 之间需要转换。

Ideal gas: n = pV / RT Amount: n = m / M Concentration: c = n / V

For example, if a question asks for the volume of CO₂ at room temperature and pressure, you must use the molar gas volume given on the insert (usually 24 dm³ mol⁻¹) or calculate it using the ideal gas equation with R from the insert.

例如，若题目要求计算室温常压下 CO₂ 的体积，你必须使用附录中给出的摩尔气体体积（通常为 24 dm³ mol⁻¹），或利用附录中的 R 值，通过理想气体方程来计算。

9. Exam Worked Example | 真题示例

Let’s apply the insert to a classic January 2022 style question: “Calculate the enthalpy change when 2.50 g of ethanol is burned to raise the temperature of 150 cm³ of water by 12.4 °C.”

我们来用附录解决一道典型的 2022 年 1 月风格题目：“计算 2.50 g 乙醇燃烧后，使 150 cm³ 水的温度升高 12.4 °C 的焓变。”

From the insert: c = 4.18 J g⁻¹ K⁻¹, density of water = 1.00 g cm⁻³. The mass of water is therefore 150 g. The energy absorbed by the water is:

由附录知：c = 4.18 J g⁻¹ K⁻¹，水的密度为 1.00 g cm⁻³。因此水的质量为 150 g。水吸收的能量为：

q = mcΔT = 150 × 4.18 × 12.4 = 7775 J ≈ 7.78 kJ

Now calculate moles of ethanol: Molar mass (C₂H₅OH) = 46.0 g mol⁻¹, so n = 2.50 / 46.0 = 0.05435 mol. The enthalpy change per mole is:

现在计算乙醇的物质的量：M(C₂H₅OH) = 46.0 g mol⁻¹，所以 n = 2.50 / 46.0 = 0.05435 mol。每摩尔焓变为：

ΔH = –q / n = –7.78 / 0.05435 = –143 kJ mol⁻¹

Note the negative sign because combustion is exothermic. Without the insert’s c value, you would not be able to complete this calculation. This is exactly why you must become familiar with referencing the data sheet.

注意负号表示燃烧放热。如果没有附录中的比热容值，你就无法完成此计算。这正是你必须熟悉数据表查阅的原因。

10. Common Mistakes and How to Avoid Them | 常见错误与对策

Students often misread the insert due to pressure. Here are the most frequent errors:

考生常在紧张状态下读错附录。以下是最高频的错误：

Mistake	Why it happens	Solution
Using ΔHc° for formation	Confusing combustion and formation	Underline the enthalpy change type in the question
Forgetting to convert kJ to J	Insert values often in kJ, equations require J	Always write units next to numbers before calculating
Using molar gas volume at RTP for non-ideal conditions	Misreading the temperature and pressure conditions	Check whether the question says RTP or standard conditions

To avoid these, train yourself to annotate the question: circle the constant name, box the value, and write the equation next to it. This simple habit dramatically improves accuracy.

为避免这些错误，请训练自己在题目中做标记：圈出常数名称，框出数值，并在旁边写出方程。这个简单的习惯能大幅提高正确率。

11. Revision Checklist for Insert 2 | 附录2复习清单

Use this checklist to confirm you are ready for data-based questions:

使用此清单来确认你已准备好应对数据型题目：

I can recall all physical constants from the insert without looking.
I can apply the gas constant in the ideal gas equation.
I can use successive ionisation energies to deduce group numbers.
I can distinguish between ΔHf° and ΔHc° and use them correctly in Hess cycles.
I can calculate enthalpy changes from bond enthalpy data.
I can solve calorimetry problems using q = mcΔT and compare with insert values.
I can convert between kJ and J, dm³ and cm³, and °C and K.
I know which equations are not on the insert and must be memorised.

我能不看书就记住附录中所有物理常数。
我能将气体常数应用于理想气体方程。
我能利用逐级电离能推断族序数。
我能区分 ΔHf° 与 ΔHc°，并在赫斯循环中正确使用它们。
我能根据键焓数据计算焓变。
我能用 q = mcΔT 解决量热问题，并与附录数值比较。
我能熟练进行 kJ 与 J、dm³ 与 cm³、°C 与 K 之间的换算。
我知道哪些方程不在附录中，必须自己记住。

12. Final Strategy for Exam Day | 考试当天最终策略

On the day of the AQA AS Chemistry exam, you will receive both inserts. Before you start writing, spend one minute scanning Insert 2. Locate the key constants and any unusual data. Then, for each question, ask: “Do I need a value from the insert? If so, where?”

在 AQA AS 化学考试当天，你会收到两份附录。开始作答前，花一分钟浏览附录2，定位关键常数和任何不常见的数据。然后对每道题提问：“我是否需要附录中的某个值？如果需要，在哪里？”

Do not panic if a value is missing. AQA only expects you to use data that is provided. If the data is not in the insert, it will be in the question itself, or you may not need it at all.

如果找不到某个数值，不要惊慌。AQA 只要求你使用已提供的数据。如果附录中没有该数据，那么它要么会在题目中给出，要么根本不需要。

Plan → Scan → Solve → Check
规划 → 扫描 → 解答 → 检查

Mastering Insert 2 is not about memorising every number; it is about understanding how the data interacts with the specification’s core equations. Revise the equations, practise past papers with the insert in hand, and you will walk into the exam with confidence.

掌握附录2 的目的不是记住每个数字，而是理解数据与考纲核心方程之间如何相互作用。复习方程，带着附录练习历年真题，你就能自信地走进考场。

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AQA AS Chemistry Insert 2 (Jan 2022): Data Sheet Decoded | AQA AS化学 2022年1月附录2：数据表解读