📚 AQA AS Chemistry Insert 1 January 2021: A Complete Guide | AQA AS化学2021年1月试卷1资料表全解读
The AQA AS Chemistry Paper 1 insert, especially for the January 2021 series, is a vital tool for students. It contains the periodic table and a range of physical chemistry data that you are expected to use during the exam. You will not be given a separate data book, so this single sheet must be understood thoroughly before you enter the examination room.
AQA AS化学2021年1月试卷1（Paper 1）的资料表，尤其是当时使用的Insert 1，是考生的重要工具。这份资料表包含了元素周期表以及一系列物理化学数据，供考试期间使用。考试时不会另外提供数据手册，因此你必须在考前彻底理解这张单页资料表。
1. The Purpose of the Insert | 资料表的用途
The insert is designed to save you from memorising numerical constants and certain trends. It provides standard data such as relative atomic masses, ionisation energies, bond enthalpies and electrode potentials. Many exam questions require you to quote or manipulate these values, so you must know exactly where to find them and how to apply them.
资料表的作用是为了避免你死记硬背数字常量和某些趋势。它提供了相对原子质量、电离能、键焓和电极电势等标准数据。许多考题要求你引用或处理这些数值，因此你必须确切知道在哪里找到它们以及如何应用。
- It contains a periodic table with atomic numbers and relative atomic masses.
- 它包含一张标示原子序数和相对原子质量的元素周期表。
- It provides physical constants used in calculations, such as Avogadro’s constant.
- 它提供了计算常用的物理常量，如阿伏伽德罗常量。
- It includes energy data useful for thermochemistry and electrochemistry.
- 它包含了热化学和电化学中有用的能量数据。
2. The Periodic Table Layout | 元素周期表的布局
The periodic table in the insert shows elements with their atomic number above the symbol and relative atomic mass below the symbol. This layout allows you to quickly write electronic configurations, determine groups and periods, and predict trends in ionisation energy and electronegativity.
资料表中的元素周期表将原子序数标在元素符号上方，相对原子质量标在元素符号下方。这种布局使你能快速写出电子排布、判断族和周期，并预测电离能及电负性的趋势。
For example, chlorine is shown as 17 above ‘Cl’ and 35.5 below ‘Cl’. The mass number is not given because chlorine exists as isotopes; the relative atomic mass is a weighted average.
例如，氯元素显示为上方17，下方’Cl’的下面为35.5。这里不给出质量数，因为氯存在同位素；相对原子质量是加权平均值。
You should remember that periods correspond to electron shells, and groups correspond to outer electron configurations. The periodic table in the insert is therefore your first language for explaining periodic trends.
你应该记住：周期对应于电子层，族对应于外层电子排布。因此资料表中的周期表是你解释周期趋势的第一语言。
3. Key Physical Constants | 关键物理常量
The insert lists essential constants for AS chemistry calculations. The most common ones are the Avogadro constant (6.022 × 10²³ mol⁻¹), the molar gas volume (24.0 dm³ mol⁻¹ at room temperature and pressure), and the ideal gas equation constant R (8.314 J K⁻¹ mol⁻¹). These values are used in nearly every quantitative topic.
资料表列出了AS化学计算中必不可少的基本常量。最常见的有：阿伏伽德罗常量（6.022×10²³ mol⁻¹）、室温常压下气体摩尔体积（24.0 dm³ mol⁻¹）以及理想气体方程中的常量R（8.314 J K⁻¹ mol⁻¹）。这些数值几乎用于每一个定量主题。
| Constant | Value / Unit |
| Avogadro constant | 6.022 × 10²³ mol⁻¹ |
| Molar gas volume (RTP) | 24.0 dm³ mol⁻¹ |
| Gas constant R | 8.314 J K⁻¹ mol⁻¹ |
4. Ionisation Energies | 电离能
Ionisation energy data are often requested by exam questions. The insert provides successive ionisation energy values for elements, which you can use to determine the number of electrons in each shell or to identify an unknown element.
电离能数据是考题经常要求使用的。资料表提供了元素的逐级电离能数值，你可据此判断各电子层中的电子数，或识别未知元素。
For example, a large jump between the third and fourth ionisation energy suggests a group 3 element, because the fourth electron is removed from a lower, inner shell. Being able to read this pattern is essential for Paper 1.
例如，第三和第四电离能之间出现巨大跃迁，表明该元素属于第三族，因为第四个电子是从更内层移出的。能够读出这种规律对Paper 1至关重要。
Also remember that first ionisation energy generally increases across a period and decreases down a group. The insert helps you to compare specific values rather than only relying on trends.
同时记住：第一电离能通常在同一周期从左到右增大，在同一族从上到下减小。资料表帮助你比较具体数值，而不只是依赖趋势。
5. Bond Enthalpy Data | 键焓数据
Bond enthalpy values are given for a selection of covalent bonds. These are average bond dissociation enthalpies, used to estimate the enthalpy change of a reaction when you know the structural formulae of the reactants and products.
资料表给出了若干共价键的键焓值。这些是平均键解离焓，当你已知反应物和产物的结构式时，可用于估算反应焓变。
The standard equation is:
ΔH = Σ(bond enthalpies of reactants) – Σ(bond enthalpies of products)
It is crucial to remember that this equation assumes all species in the gaseous state. If the question gives other states, you must include additional enthalpy terms such as atomisation or vaporisation.
务必记住：该方程假设所有物质都处于气态。如果题目给出了其他状态，你必须额外考虑原子化能或汽化焓等热力学项。
6. Standard Electrode Potentials | 标准电极电势
The insert provides standard electrode potentials for a range of half-cells. These values allow you to predict the direction of redox reactions by comparing the numerical potentials. The more positive electrode potential corresponds to the oxidising agent that is reduced.
资料表提供了一系列半电池的标准电极电势。通过这些数值，你可以比较电势大小来预测氧化还原反应的方向。电势越正的物质作为氧化剂被还原。
When writing cell notation, always place the most negative electrode potential on the left and the most positive on the right. The cell EMF is given by:
在书写原电池符号时，总是将较负的电极电势放在左边，较正的放在右边。原电池电动势公式为：
E°cell = E°(right) – E°(left)
In AS chemistry you may only be asked to use this for simple predictions, but it is a core skill for Paper 1.
在AS化学中，你可能只需用其进行简单预测，但这是Paper 1的核心技能。
7. Reading the Data Correctly | 正确读取数据
Many students lose marks because they misread units or ignore the sign conventions. Always check whether the insert gives values in kJ or J, and whether the ionisation energies are per mole or per atom.
很多学生因为误读单位或忽略正负号而失分。要经常检查资料表中的数值是以kJ还是J为单位，以及电离能是每摩尔还是每个原子。
- Check the columns and rows before copying a number.
- 在抄写数值前，先仔细核对行和列。
- Use the same number of significant figures as the data in the insert.
- 有效数字要与资料表中的数据保持一致。
- Convert units when necessary; for example, J to kJ.
- 必要时进行单位换算，例如将J转换为kJ。
8. Common Pitfalls | 常见易错点
One common mistake is confusing ΔH with bond enthalpy. Bond enthalpy is always positive for bond breaking, but the overall reaction enthalpy can be negative for exothermic reactions.
常见错误之一是将ΔH与键焓混淆。键焓在断键时一定为正，但整个反应的焓变在放热反应中可以为负。
Another mistake is using the electrode potential of a half-cell in the wrong direction; you must never flip the sign when using E° values in cell calculations. The equation E°cell = E°(reduction) – E°(oxidation) is sometimes applied incorrectly.
另一个易错点是在使用半电池电极电势时弄反方向；计算电池电动势时绝不可随意改变E°的符号。公式E°cell = E°(还原) – E°(氧化)有时会被用错。
Also, students often forget to multiply bond enthalpies by the number of moles of each bond in the molecule. Balances must be correct before subtracting.
此外，学生经常忘记将键焓乘以分子中该键的摩尔数。在相减之前必须配平化学方程式。
9. Application to Calculation Questions | 计算题中的应用
Calculation questions in Paper 1 may ask you to find the enthalpy change of a reaction using bond enthalpies. You should list every bond in the reactants and products, then apply the formula with the values from the insert.
Paper 1中的计算题可能要求你利用键焓求反应焓变。你应该列出反应物和产物中的所有键，然后使用资料表中的数值代入公式。
For example, the combustion of methane can be solved using average bond enthalpies:
例如，甲烷燃烧可借助平均键焓求解：
CH₄ + 2O₂ → CO₂ + 2H₂O
You must break four C-H bonds and two O=O bonds, then form two C=O bonds and four O-H bonds. Use the insert values and calculate ΔH.
你需要断裂四个C-H键和两个O=O键，然后形成两个C=O键和四个O-H键。利用资料表中的数值计算ΔH。
Working through such examples systematically is the best way to avoid careless arithmetic errors.
系统性地练习这类例题是避免粗心算术错误的最佳方法。
10. Application to Explanatory Questions | 解释题中的应用
Explanatory questions often require you to compare ionisation energies or explain why a particular trend exists. The insert provides actual data, so you should quote values rather than making vague statements.
解释题经常要求你比较电离能或解释某一趋势存在的原因。资料表提供了实际数据，因此你应该引用数值，而不是给出笼统的表述。
For instance, if asked why nitrogen has a higher first ionisation energy than oxygen, you can mention that nitrogen has a half-filled 2p subshell. Although this is not in the insert, the relative values are, so you can refer to them to support your reasoning.
例如，如果被问到为什么氮的第一电离能比氧高，你可以提到氮具有半充满的2p亚层。虽然这一点不出现在资料表中，但两者的相对数值在表中，你可用以支持自己的推理。
Always connect the data to a chemical principle: nuclear charge, shielding and electron-pair repulsion.
始终将数据与化学原理联系：核电荷、屏蔽效应和电子对排斥作用。
11. Revision Strategy with Insert 1 | 借助资料表复习的策略
The best way to become familiar with the insert is to practise with every past paper. Print a clean copy of the January 2021 insert and keep it beside you while doing questions.
熟悉资料表最好的方法是用历年真题进行练习。打印一份2021年1月资料表的清晰副本，在做题时放在身边。
- Label the insert with notes about common uses for each data table.
- 在资料表上标注每个数据区的常见用途。
- Set a timer to simulate exam conditions while using the insert.
- 设定计时器，在模拟考试条件下使用资料表。
- Review your mistakes to see if they came from misreading data.
- 回顾错误，判断是否源于误读数据。
This active practice will build automaticity, so that on the real exam you can quickly locate a value and move on.
这种主动练习会让你形成条件反射，在真正考试时能够快速找到所需数值并继续做题。
12. Final Checklist | 考前最终清单
Before entering the exam, verify that you understand the following points:
进入考场前，请确认你已理解以下要点：
- Where the periodic table is and how to extract atomic data.
- 元素周期表的位置，以及如何提取原子数据。
- Which constants are available and their units.
- 哪些常量可用，以及它们的单位。
- How to use ionisation energy and bond enthalpy values.
- 如何使用电离能和键焓数值。
- How to calculate standard cell EMF from electrode potentials.
- 如何从电极电势计算标准电池电动势。
If you can confidently perform each of these tasks, you are ready for Paper 1.
如果你能自信地完成以上所有任务，那你已经为Paper 1做好了充分准备。
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