Mastering the AQA AS Chemistry Unit 2 January 2020 Insert | 精析 AQA AS 化学第二单元 2020 年 1 月卷插入材料

📚 Mastering the AQA AS Chemistry Unit 2 January 2020 Insert | 精析 AQA AS 化学第二单元 2020 年 1 月卷插入材料

The AQA AS Chemistry Unit 2 paper (CHEM2) for January 2020 typically includes an insert with data that supports questions across energetics, kinetics, equilibria, redox, and organic analysis. You must learn to use this insert actively rather than treat it as a separate booklet.

AQA AS 化学第二单元 2020 年 1 月试卷的插入材料是一份数据丰富的资源。它通常包含元素周期表、红外吸收波段、质谱碎片表、标准电极电势，有时还有有机反应路线图。你必须主动使用这份插入材料，而不是把它当作独立的册子。

1. Overview of the January 2020 CHEM2 Insert | 2020年1月 CHEM2 插入材料概览

The insert is not a set of random facts. It gives you the numerical and structural data needed to answer multistep questions. In January 2020, common insert items included infrared correlation tables, standard electrode potentials, and an organic pathway map.

插入材料不是一组随机事实。它为你提供解答多步计算和推理题所需的数值与结构数据。在 2020 年 1 月卷中，常见的插入材料包括红外对照表、标准电极电势以及有机反应路线图。

Before attempting any calculation, scan the insert to see which data set the question refers to. If a question asks about bond vibrations, use the IR table. If it asks about feasibility, use the electrode potential list.

在开始计算之前，快速浏览插入材料，查看题目指向哪一组数据。如果题目考查键的振动，就使用红外表。如果考查反应可行性，就使用电极电势表。

2. Common Infrared Data in the Insert | 插入材料中常见的红外数据

Infrared data in the insert usually covers the most frequently tested absorptions. For example, an O-H stretch in alcohols appears as a broad peak from 3200 to 3550 cm⁻¹, while a carboxylic acid O-H is very broad from 2500 to 3000 cm⁻¹.

插入材料中的红外数据通常涵盖最常考查的吸收。例如，醇中的 O-H 伸缩振动在 3200 至 3550 cm⁻¹ 出现宽峰，而羧酸中的 O-H 伸缩振动在 2500 至 3000 cm⁻¹ 非常宽。

C appears near 1620 to 1680 cm⁻¹. Use these values to distinguish between an alcohol, a ketone, an aldehyde, a carboxylic acid, and an alkene.

C=O 伸缩振动是大约在 1680 至 1750 cm⁻¹ 的尖而强的信号，C=C 出现在 1620 至 1680 cm⁻¹ 附近。利用这些数值可区分醇、酮、醛、羧酸和烯烃。

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3. Mass Spectrometry Fragmentation Patterns | 质谱裂解规律

The insert may provide a mass spectrum or a list of common fragment ions. In AQA Unit 2, you need to identify the molecular ion peak, understand that M and M+1 peaks arise from carbon-13, and use fragmentation to determine structure.

插入材料可能提供质谱图或常见碎片离子列表。在 AQA 第二单元中，你需要识别分子离子峰，理解 M 和 M+1 峰由碳-13 引起，并利用裂解方式确定结构。

Common fragments for organic compounds include CH₃⁺ at m/z 15, C₂H₅⁺ at m/z 29, C₃H₇⁺ at m/z 43, and C₆H₅⁺ at m/z 77. Aldehydes and ketones often lose an alkyl group to give an acylium ion, such as CH₃CO⁺ at m/z 43.

有机化合物常见碎片包括 m/z 15 的 CH₃⁺、m/z 29 的 C₂H₅⁺、m/z 43 的 C₃H₇⁺ 以及 m/z 77 的 C₆H₅⁺。醛和酮常常失去一个烷基生成酰基正离子，例如 m/z 43 的 CH₃CO⁺。

4. Enthalpy Cycles and Calorimetry Data | 焓循环与量热数据

ert often provide standard enthalpy of formation data. You combine these values using Hess's law. The key expression is ΔH = ΣΔHf(products) - ΣΔHf(reactants).

2020 年 1 月第二单元插入材料中的焓变题通常提供标准生成焓数据。你需要利用盖斯定律将这些数值组合起来。关键表达式为 ΔH = ΣΔHf(生成物) - ΣΔHf(反应物)。

ΔH = ΣΔHf(products) - ΣΔHf(reactants)

. Use q = mcΔT, then divide by the moles of limiting reactant to calculate ΔH in kJ mol⁻¹.

对于量热法，

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