📚 AQA AS Chemistry Paper 2 Insert (January 2022): How to Use Data for Organic Analysis | AQA AS 化学 2022 年 1 月卷二插页：有机分析数据运用指南
The January 2022 AQA AS Chemistry Paper 2 insert is not just an extra sheet; it is a carefully selected data resource that candidates must learn to read quickly and accurately. In the real exam, many marks are lost because students ignore the insert or misread a wavenumber, mass-to-charge ratio, or chemical shift. This article breaks down the key data types found in a typical AQA AS Paper 2 insert and shows you how to turn them into full-mark answers.
2022 年 1 月 AQA AS 化学卷二插页不是一张多余的纸，而是考生必须学会快速且准确读取的精选数据资源。在实际考试中，许多学生因忽略插页或误读波数、质荷比或化学位移而丢分。本文拆解典型 AQA AS 卷二插页中的关键数据类型，并教你如何将它们转化为满分答案。
1. Why the Insert Matters in AS Chemistry | 为什么插页对 AS 化学至关重要
The insert in AQA AS Chemistry Paper 2 typically contains infrared absorption tables, mass spectrometry reference peaks, and sometimes a simplified periodic table or electronegativity values. These tables are not decorative; questions often state ‘Use the insert to explain…’ or ‘Identify the functional group using the data sheet.’
AQA AS 化学卷二的插页通常包含红外吸收表、质谱参考峰，有时还有简化周期表或电负性值。这些表格不是装饰；题目常会写 ‘利用插页解释……’ 或 ‘利用数据表识别官能团’。
The most common mistake is to try to recall every value from memory. You do not need to memorise all infrared absorption ranges, but you must be able to locate the right row, compare values, and justify your conclusion with precision.
最常见的错误是试图凭记忆回忆所有数值。你不需要记住所有红外吸收范围，但必须能够找到正确的行、比较数值，并准确说明结论。
2. Infrared Spectroscopy Data: Key Absorptions | 红外光谱数据：关键吸收峰
In AS Paper 2, the infrared section of the insert is often the most heavily tested. You should treat the table as a checklist: look for the strongest, most diagnostic peaks first, such as C=O around 1700 cm⁻¹ or a broad O-H around 3200-3550 cm⁻¹.
在 AS 卷二考试中，插页的红外部分通常是考查最多的内容。你应将该表视为清单：优先寻找最强、最具诊断意义的峰，例如约 1700 cm⁻¹ 处的 C=O 或 3200-3550 cm⁻¹ 处的宽 O-H 峰。
| Bond | 化学键 | Functional group | 官能团 | Wavenumber range (cm⁻¹) | 波数范围 | Comment | 备注 |
| C-H | alkane, alkene, arene | 2850-3100 | often sharp, may be hidden by O-H |
| O-H | alcohol, carboxylic acid | 2500-3550 | very broad, easy to spot |
| C=O | aldehyde, ketone, carboxylic acid, ester | 1680-1750 | strong, sharp, diagnostic |
| C=C | alkene, arene | 1620-1680 | variable, can be weak |
| C-O | alcohol, ester | 1000-1300 | strong, often in fingerprint region |
| C≡N | nitrile | 2220-2260 | sharp, unusual high region |
| C-Cl | halogenoalkane | 700-800 | strong, confirms halogen presence |
Always quote the range exactly as given in the insert rather than inventing a single value. AQA examiners reward precise use of data and penalise vague phrases like ‘there is a peak at about 1700’.
务必准确引用插页给出的范围，而不是随意捏造单一数值。AQA 考官奖励精确使用数据的作答，并扣罚模糊表述，例如 ‘在约 1700 处有一个峰’。
3. Reading IR Spectra Step by Step | 逐步解读红外光谱
Start by identifying the presence or absence of a strong C=O peak. If C=O is present, you can narrow the family to aldehyde, ketone, carboxylic acid, or ester. If C=O is absent, consider alcohol, ether, alkene, or amine.
首先判断是否存在强 C=O 峰。如果存在 C=O，你可以将物质归为醛、酮、羧酸或酯。如果不存在 C=O，则考虑醇、醚、烯烃或胺。
Next, look for a broad O-H peak. A very broad O-H from 2500 to 3550 cm⁻¹ often signals a carboxylic acid, especially when combined with C=O. A narrower O-H around 3230-3550 cm⁻¹ without C=O is typical of an alcohol.
接下来，寻找宽 O-H 峰。2500 至 3550 cm⁻¹ 范围内的极宽 O-H 峰通常表示羧酸，尤其是同时存在 C=O 时。无 C=O 且 O-H 位于约 3230-3550 cm⁻¹ 的较窄峰则典型地属于醇。
Finally, check for specific sharp peaks such as C≡N around 2250 cm⁻¹ or C-Cl around 700-800 cm⁻¹. These are less common but highly diagnostic when they appear.
最后，检查特定的尖峰，例如约 2250 cm⁻¹ 的 C≡N 或 700-800 cm⁻¹ 的 C-Cl。这些峰虽然不太常见，但一旦出现就极具诊断价值。
4. Mass Spectrometry: Molecular Ion and Fragmentation | 质谱：分子离子与碎片
The mass spectrum section of the insert often provides fragment ion tables or an annotated spectrum. The peak with the highest m/z value is usually the molecular ion, M⁺, which gives the relative molecular mass of the compound, provided no significant M+1 or M+2 confusion occurs.
插页中的质谱部分通常提供碎片离子表或注释光谱。最高 m/z 值的峰通常为分子离子 M⁺，它给出化合物的相对分子质量，前提是 M+1 或 M+2 干扰不显著。
Common fragment ions quoted in AQA inserts include CH₃⁺ at m/z 15, C₂H₅⁺ at m/z 29, C₃H₇⁺ at m/z 43, C₆H₅⁺ at m/z 77, and C₆H₅CH₂⁺ at m/z 91. Recognition of these helps assign organic structures from fragmentation patterns.
AQA 插页中常见的碎片离子包括 m/z 15 的 CH₃⁺、m/z 29 的 C₂H₅⁺、m/z 43 的 C₃H₇⁺、m/z 77 的 C₆H₅⁺ 以及 m/z 91 的 C₆H₅CH₂⁺。识别这些碎片有助于根据碎片化模式推断有机结构。
When using fragmentation data, always link the fragment to a plausible radical or cation and explain how it can be lost from the molecular ion. A simple list of peaks without explanation will not gain full marks.
使用碎片数据时，务必将碎片与合理的自由基或阳离子联系起来，并解释它如何从分子离子失去。仅仅列出峰而无解释将无法获得满分。
5. Using the M+1 Peak and Isotopes | 利用 M+1 峰与同位素
Carbon-13 has a natural abundance of about 1.1%, so the M+1 peak intensity can be used to estimate the number of carbon atoms in a molecule. Divide the M+1 peak height by the M⁺ peak height and then by 1.1% to obtain an approximate carbon count.
碳-13 的天然丰度约为 1.1%，因此 M+1 峰强度可用于估算分子中的碳原子数。将 M+1 峰高除以 M⁺ 峰高，再除以 1.1%，即可得到近似的碳原子数。
For chlorine or bromine containing compounds, the insert may show M+2 and M+4 peaks. Chlorine gives a 3:1 ratio for M:M+2, while bromine gives a 1:1 ratio. This isotopic pattern is very useful for identifying halogenoalkanes.
对于含氯或含溴的化合物，插页可能显示 M+2 和 M+4 峰。氯产生 M:M+2 = 3:1 的比例，而溴产生 1:1 的比例。这种同位素模式对识别卤代烷非常有帮助。
Always check the molecular ion region carefully before assigning a formula. A small M+1 peak can be mistaken for the molecular ion if the actual M⁺ peak is very weak or absent.
在确定分子式之前，务必仔细检查分子离子区域。如果实际的 M⁺ 峰很弱或缺失，小 M+1 峰可能被误认为分子离子。
6. Combined Spectra Problems: AQA Style | 综合光谱题：AQA 风格
Many AS Paper 2 questions give an infrared spectrum, a mass spectrum, and sometimes a chemical test result together. You must integrate evidence from all sources to identify an unknown compound. Start from the molecular ion, then use IR to find functional groups, and finally check fragmentation peaks.
许多 AS 卷二题目会同时给出红外光谱、质谱，有时还会给出化学检验结果。你必须整合所有来源的证据来鉴定未知化合物。从分子离子开始，然后利用红外找到官能团，最后核对碎片峰。
Show your reasoning in a logical sequence: mass spectrum gives Mᵣ, IR identifies C=O or O-H, chemical tests such as Tollens distinguish aldehyde from ketone. This approach mirrors how real chemists solve structure problems.
以逻辑顺序展示推理过程：质谱给出相对分子质量，红外识别 C=O 或 O-H，托伦试剂等化学检验区分醛和酮。这种方法模拟了真实化学家解决结构问题的过程。
AQA expects you to use the insert to state evidence, not just conclusions. For example, write ‘the IR spectrum shows an absorption at 1720 cm⁻¹, which is in the C=O range, so the compound contains a carbonyl group.’
AQA 期望你利用插页陈述证据，而不仅仅是结论。例如，写 ‘红外光谱在 1720 cm⁻¹ 处显示吸收，该值在 C=O 范围内，因此该化合物含有羰基’。
7. Organic Functional Group Tests from the Insert | 插页中的有机官能团检验
The insert may also include a summary of qualitative tests for organic functional groups. These are particularly useful when the spectra are incomplete or when you need additional evidence to confirm a structure.
插页还可能包含有机官能团的定性检测摘要。当光谱数据不完整或需要额外证据确认结构时，这些检测尤其有用。
| Functional group | 官能团 | Test reagent | 检测试剂 | Positive result | 正结果 |
| Alkene | Bromine water | Orange to colourless |
| Primary/secondary alcohol | Acidified dichromate(VI) | Orange to green |
| Aldehyde | Tollens reagent | Silver mirror |
| Carbonyl (aldehyde or ketone) | 2,4-DNP | Orange precipitate |
| Carboxylic acid | Sodium carbonate solution | Fizzing, CO₂ evolved |
| Haloalkane | AgNO₃ after hydrolysis | White, cream, or yellow precipitate |
When answering test questions, give the reagent, the condition if relevant, and the colour change. For example, ‘add acidified potassium dichromate(VI); the orange solution turns green, indicating a primary or secondary alcohol.’
在回答检验问题时，给出试剂、相关条件以及颜色变化。例如，’加入酸化重铬酸钾(VI)；橙色溶液变为绿色，表明存在伯醇或仲醇’。
8. Required Practical Links: Distillation and Reflux | 必修实验连接：蒸馏与回流
AS Paper 2 often includes questions on organic preparation techniques such as reflux and distillation, which may be linked to the insert through product identification. Reflux is used to heat a reaction mixture for a long time without losing volatile components, while distillation separates products based on boiling point.
AS 卷二经常包含关于有机制备技术的问题，如回流和蒸馏，这些内容可能通过产物鉴定与插页联系起来。回流用于长时间加热反应混合物而不损失挥发性组分，而蒸馏则根据沸点分离产物。
You should be able to draw and label a reflux condenser and a distillation apparatus. Key points include water flow direction, anti-bumping granules, and the position of the thermometer bulb.
你应能绘制并标注回流冷凝管和蒸馏装置。关键点包括水流方向、防暴沸颗粒以及温度计球的位置。
After the practical, the product can be tested by infrared spectroscopy or chemical tests to confirm the functional group. The insert data then becomes the bridge between practical work and structural identification.
实验结束后，可以通过红外光谱或化学检测来确认产物的官能团。此时插页数据成为连接实验操作与结构鉴定的桥梁。
9. Common Pitfalls and Examiner Tips | 常见失分点与考官建议
One common pitfall is quoting a wavenumber outside the given range and then claiming a functional group is present. Always copy the exact range from the insert and show your comparison explicitly.
一个常见失分点是引用了给定范围之外的波数，然后声称存在某个官能团。务必从插页中准确抄写范围，并明确展示你的比较过程。
Another mistake is confusing the molecular ion with the base peak. The base peak is the tallest peak and is often a fragment, not the molecular ion. The molecular ion is the highest m/z value, not the highest intensity.
另一个错误是将分子离子与基峰混淆。基峰是最高的峰，通常是碎片离子，而不是分子离子。分子离子是 m/z 值最高的峰，而不是强度最高的峰。
Examiners also report that students lose marks by failing to state both the reagent and the observation in functional group tests. ‘Bromine water’ alone is insufficient; you must say ‘bromine water turns from orange to colourless.’
考官还指出，学生在官能团检验中因未同时说明试剂和现象而丢分。仅写 ‘溴水’ 不够；你必须写 ‘溴水由橙色变为无色’。
10. Revision Checklist Before the Exam | 考前复习清单
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