📚 Year 13 WJEC Chemistry: Terminology Memorisation Guide | Year 13 WJEC 化学词汇术语速记指南
Mastering the vocabulary of A-Level Chemistry is not only about memorising definitions—it is about making connections and understanding concepts at a deeper level. This guide covers the essential terminology for Year 13 WJEC Chemistry, organised by topic, along with effective memorisation tricks to help you recall key terms confidently in your exams. All definitions are aligned with the WJEC specification and crafted to stick in your long-term memory.
掌握 A-Level 化学的词汇不仅仅是记住定义——更在于建立联系、深入理解概念。本指南涵盖 WJEC Year 13 化学课程各主题的核心术语，并提供高效的记忆技巧，帮助你在考试中自信地回忆关键术语。所有定义均贴合 WJEC 考试大纲，并经过精心设计以便长期记忆。
1. Organic Reaction Mechanisms: Electrophiles and Nucleophiles | 有机反应机理：亲电试剂与亲核试剂
Understanding the roles of electrophiles and nucleophiles is fundamental to predicting organic reaction outcomes. Here we break down the key species and the most common mechanisms with memory hooks that link directly to their electronic character.
理解亲电试剂和亲核试剂的角色是预测有机反应产物的基础。下面我们拆解关键物种与最常见机理，并提供与它们电子特性直接挂钩的记忆锚点。
Electrophile: An electrophile is an electron-deficient species (often with a positive charge or a partial positive charge) that accepts an electron pair to form a covalent bond. Memory: 'Electro' suggests electricity, seeking electrons; 'phile' means loving. So an electrophile is an electron lover—it craves extra electrons.
亲电试剂：亲电试剂是缺电子的物种（通常带正电荷或部分正电荷），接受一对电子形成共价键。记忆：“亲电”可理解为亲近电子，因其自身缺电子，所以渴望得到电子。
Nucleophile: A nucleophile is an electron-rich species that donates an electron pair to an electron-deficient centre. Memory: 'Nucleo' sounds like nucleus, which is positive, so a nucleophile is attracted to positive centres. Think of it as a 'nucleus lover' hunting for a positive charge.
亲核试剂：亲核试剂是富电子的物种，将一对电子给予缺电子中心。记忆：“亲核”中的“核”暗示带正电的核，因此亲核试剂被正电中心吸引，就像核的爱好者。
Electrophilic Addition: This mechanism occurs when an electrophile attacks an electron-rich double bond, leading to addition across the bond. It is the typical reaction of alkenes with HBr, Br₂ or H₂SO₄. Memory: Picture the electrophile 'adding on' because the double bond is an electron cloud begging to be attacked.
亲电加成：此机理发生在亲电试剂进攻富电子的双键，导致加成到双键两端。烯烃与 HBr、Br₂ 或 H₂SO₄ 的典型反应就是亲电加成。记忆：想象亲电试剂“加上去”，因为双键是一片电子云，积极邀请进攻。
Nucleophilic Substitution: onfiguration. Memory: SN1 likes weak nucleophiles and stable carbocations (tertiary). SN2 prefers strong nucleophiles and less hindered substrates (primary). Think 'SN2 = simultaneous 2-step in one go'.
亲核取代：亲核试剂取代 sp³ 碳上的离去基团。SN1 经过碳正离子中间体；SN2 是协同过程，伴随构型翻转。记忆：SN1 喜欢弱亲核试剂和稳定的碳正离子（叔碳）；SN2 喜欢强亲核试剂和空间位阻小的底物（伯碳）。可以记作“SN2 一步双人舞”。
2. Aromatic Chemistry: Benzene and Its Derivatives | 芳香化学：苯及其衍生物
The stability of the benzene ring dictates its preference for electrophilic substitution rather than addition. Focus on the directing effects of substituents and the key reagents needed for introducing functional groups onto the ring.
苯环的稳定性决定了它倾向于亲电取代而不是加成。重点掌握取代基的定位效应以及将官能团引入苯环所需的关键试剂。
Aromaticity & Delocalised π System: Benzene (C₆H₆) has six p electrons delocalised across six carbon atoms, forming a ring of electron density above and below the plane. This delocalisation gives exceptional stability. Memory: Picture a 'doughnut' of electrons that makes benzene feel complete and unwilling to add reagents that would break the ring.
芳香性与离域 π 体系：苯（C₆H₆）的六个 p 电子离域在六个碳原子上，形成环平面上下的电子云。离域赋予苯非凡的稳定性。记忆：想象一个电子“甜甜圈”，使苯很满足，不愿意发生破坏环的加成反应。
Electrophilic Aromatic Substitution: The typical mechanism where the benzene ring reacts with a strong electrophile generated in situ (e.g. NO₂⁺ from HNO₃/H₂SO₄ for nitration). The delocalised ring attacks the electrophile, a carbocation intermediate forms, and then loses H⁺ to restore aromaticity. Memory: 'EAS' – Electrophile Attacks the System; the ring temporarily sacrifices one proton to keep its aromatic doughnut.
亲电芳香取代：典型的反应机理，苯环与原位生成的强亲电试剂（如由 HNO₃/H₂SO₄ 产生的 NO₂⁺ 用于硝化）反应。离域环进攻亲电试剂，形成碳正离子中间体，然后失去 H⁺ 恢复芳香性。记忆：“EAS”——亲电试剂攻击体系；环暂时牺牲一个质子以保住芳香甜甜圈。
Activating & Deactivating Groups; Directors: Electron-donating groups (e.g. –OH, –NH₂) activate the ring and direct substitution to the ortho/para positions. Electron-withdrawing groups (e.g. –NO₂, –COOH) deactivate and direct to the meta position. Halogens are deactivating but direct ortho/para due to their lone pairs. Memory: Donating groups are 'OPening' for ortho/para; withdrawing groups are 'MEta-stasising' to meta. Halogens are the confusing siblings—deactivating yet ortho/para.
活化基与钝化基；定位基：给电子基团（如 –OH、–NH₂）活化苯环并将取代基定位在邻位/对位。吸电子基团（如 –NO₂、–COOH）钝化苯环并指向间位。卤素是钝化基团但因具有孤对电子而引导邻/对位。记忆：给电子基团开启邻对位（OPening）；吸电子基团引向间位（MEta）。卤素是矛盾的异类——钝化却邻对位。
3. Carbonyl Compounds: Aldehydes and Ketones | 羰基化合物：醛与酮
larised, making the carbon electrophilic. Distinguishing between aldehydes and ketones and understanding nucleophilic addition are the core skills for this topic.
羰基（C=O）高度极化，使碳具有亲电性。区分醛与酮以及理解亲核加成是本主题的核心技能。
Carbonyl Polarity & Nucleophilic Addition: and susceptible to attack by nucleophiles such as CN⁻ or hydride (H⁻ from NaBH₄). Memory: 'C=O is like a magnet: O pulls electrons, C becomes a positive trap for nucleophiles.'
羰基极性及亲核加成：氧原子拉走电子密度，使碳带 δ+，易受 CN⁻ 或氢负离子（来自 NaBH₄ 的 H⁻）等亲核试剂进攻。记忆：“C=O 像一块磁铁：O 吸走电子，C 变成亲核试剂的正电陷阱。”
Distinguishing Tests: Aldehydes are oxidised easily; they reduce Tollen's reagent (silver mirror) and Fehling's/Benedict's solution (brick-red precipitate). Ketones do not react. 2,4-DNPH gives a yellow/orange precipitate with both aldehydes and ketones. Memory: Aldehydes have a hydrogen on the carbonyl carbon, making them 'H-apple' that can be oxidised; ketones are 'K-cannot'.
鉴别检验：醛容易氧化；它们能还原托伦斯试剂（银镜）和斐林试剂/本尼迪克特试剂（砖红色沉淀）。酮不反应。2,4-二硝基苯肼与醛和酮均生成黄色/橙色沉淀。记忆：醛在羰基碳上有一个氢，可被氧化，就像“含氢 apple”；酮则无法氧化——“K 不行”。
Reduction with NaBH₄: Sodium borohydride is a source of nucleophilic H⁻ and reduces aldehydes to primary alcohols and ketones to secondary alcohols in aqueous or alcoholic solution. Memory: NaBH₄ is a 'H⁻ taxi' – it drops off a hydride at the carbonyl carbon.
NaBH₄ 还原：硼氢化钠是亲核 H⁻ 的来源，在水或醇溶液中将醛还原为伯醇，将酮还原为仲醇。记忆：NaBH₄ 是“氢负离子出租车”——把氢负离子送到羰基碳上。
4. Carboxylic Acids and Derivatives: Acyl Compounds | 羧酸及其衍生物：酰基化合物
This family includes carboxylic acids, acyl chlorides, esters, amides and acid anhydrides. Their reactivity follows a clear pattern, and linking them through nucleophilic addition–elimination is crucial for synthesis questions.
这一家族包括羧酸、酰氯、酯、酰胺和酸酐。它们的反应活性遵循清晰规律，通过亲核加成-消除反应将它们联系起来对合成题至关重要。
Acyl Chloride Reactivity: Acyl chlorides (RCOCl) are the most reactive carboxylic acid derivatives. They react readily with water, alcohols, ammonia and amines to form carboxylic acids, esters, and amides respectively, often at room temperature. Memory: Acyl chlorides are 'energy-rich tigers' – they leap into reactions because Cl is a good leaving group.
酰氯反应活性：酰氯 (RCOCl) 是反应活性最高的羧酸衍生物。它们在室温下就能与水、醇、氨和胺反应，分别生成羧酸、酯和酰胺。记忆：酰氯是“活力猛虎”——因为 Cl 是个很好的离去基团，反应迫不及待。
Esterification & Hydrolysis: Carboxylic acid + alcohol ⇌ ester + water, catalysed by H⁺. The reverse reaction is acid- or base-catalysed hydrolysis. Base hydrolysis (saponification) goes to completion because the carboxylate ion is formed. Memory: Esterification is a 'slow equilibrium dance'; saponification is 'base
Published by TutorHao | Year 13 Chemistry Revision Series | aleveler.com
更多咨询请联系16621398022（同微信）
或截图后用「扫一扫 → 相册」选择本图