Year 13 CAIE Chemistry: Rapid Vocabulary Memorisation Guide | Year 13 CAIE 化学：词汇术语速记指南

📚 Year 13 CAIE Chemistry: Rapid Vocabulary Memorisation Guide | Year 13 CAIE 化学：词汇术语速记指南

Mastering the precise terminology of A2 Chemistry is half the battle for CAIE exam success. This guide breaks down high-yield Year 13 vocabulary into thematic clusters, pairing each term with memory hooks, root analysis, and conceptual links to help you recall definitions effortlessly under pressure.

在 CAIE A2 化学中，精准掌握术语是夺取高分的关键一步。本指南将 Year 13 高频词汇按主题分类，为每个术语配上记忆挂钩、词根拆解和概念链接，帮助你在考试压力下轻松回忆起定义。

1. Thermodynamics & Energetics | 热力学与能量学

Enthalpy of atomisation: The enthalpy change when one mole of gaseous atoms is formed from the element in its standard state. Think ‘atom-isation’ — turning an element into separate atoms always requires energy, so it is endothermic.

原子化焓：在标准状态下，由元素生成一摩尔气态原子时的焓变。联想“原子化”——将元素变为单个原子总是需要吸收能量，因此是吸热的。

Lattice energy: The enthalpy change when one mole of an ionic compound is formed from its gaseous ions. It is always exothermic. Remember ‘lattice’ is the solid structure; forming bonds releases energy.

晶格能：由气态离子生成一摩尔离子化合物时的焓变，总是放热的。记住“晶格”是固体结构，成键释放能量。

Electron affinity: The enthalpy change when one mole of electrons is added to one mole of gaseous atoms to form one mole of gaseous 1⁻ ions. First electron affinity is exothermic, second is endothermic (adding negative to negative requires work).

电子亲和能：一摩尔电子加到一摩尔气态原子上形成一摩尔气态 1⁻ 离子时的焓变。第一电子亲和能放热，第二电子亲和能吸热（负对负需要做功）。

Entropy (S): A measure of the disorder or dispersal of energy in a system. Units: J K⁻¹ mol⁻¹. Gases have higher entropy than liquids, than solids. ‘S for spread’.

熵 (S)：衡量系统混乱度或能量分散程度的物理量。单位：J K⁻¹ mol⁻¹。气体的熵高于液体，液体高于固体。联想“S—散开”。

Gibbs free energy: ΔG = ΔH − TΔS. A reaction is feasible when ΔG < 0. Memorise 'Greatest Good': negative G gives a feasible process.

吉布斯自由能：ΔG = ΔH − TΔS。当 ΔG < 0 时反应是可行的。记忆口诀：“吉布斯告诉我，负 G 就能行”。

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2. Electrochemistry | 电化学

Standard electrode potential (E°) : The voltage of a half-cell relative to the standard hydrogen electrode under standard conditions (298 K, 1 mol dm⁻³, 100 kPa). The more positive E°, the stronger the oxidising agent.

标准电极电势 (E°)：在标准条件下（298 K，1 mol dm⁻³，100 kPa），半电池相对于标准氢电极的电压。E° 越正，氧化剂越强。

Salt bridge: A piece of filter paper soaked in saturated KNO₃(aq) or a tube of agar gel with KNO₃, allowing ion movement to complete the circuit. ‘Bridge for ions, not electrons’.

盐桥：浸泡在饱和 KNO₃ 溶液中的滤纸条或含 KNO₃ 的琼脂凝胶管，允许离子移动以构成完整回路。“盐桥通离子，不通电子”。

Fuel cell: A cell that converts chemical energy directly into electricity using a continuous supply of fuel and oxygen, with no combustion. Hydrogen fuel cell: H₂ + ½O₂ → H₂O. Remember ‘fuel cell feeds on fuel continuously’.

燃料电池：利用燃料与氧气的连续供给直接将化学能转化为电能的装置，不发生燃烧。氢燃料电池：H₂ + ½O₂ → H₂O。联想“燃料电池持续吃燃料”。

Standard cell potential (E°cell): E°cell = E°cathode − E°anode. For a spontaneous reaction, E°cell must be positive. Think ‘Cell is positive = process is positive’.

标准电池电动势 (E°cell)：E°cell = E°阴极 − E°阳极。自发性反应的 E°cell 必须为正值。记住“电池正，反应顺”。

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3. Equilibria | 平衡

Dynamic equilibrium: The state in a reversible reaction where the rates of the forward and reverse reactions are equal, and concentrations of reactants and products remain constant. ‘Dynamic = still moving, equilibrium = balanced’.

动态平衡：可逆反应中正逆反应速率相等、反应物和产物浓度保持恒定的状态。“动态”指仍在反应，“平衡”指浓度不变。

Le Chatelier’s Principle: If a system at equilibrium is subjected to a change in concentration, pressure or temperature, the position of equilibrium shifts to oppose the change. ‘Lazy Le Chatelier: the system does the opposite to restore comfort’.

勒夏特列原理：如果改变平衡系统的浓度、压强或温度，平衡位置会向减弱这种改变的方向移动。联想“懒惰的勒夏特列：系统反向操作来恢复舒服”。

Equilibrium constant Kc: For aA + bB ⇌ cC + dD, Kc = [C]ᶜ[D]ᵈ / [A]ᵃ[B]ᵇ. Units depend on the sum of stoichiometric coefficients. Kc is only affected by temperature.

平衡常数 Kc：对于 aA + bB ⇌ cC + dD，Kc = [C]ᶜ[D]ᵈ / [A]ᵃ[B]ᵇ。单位由计量数之和决定。Kc 仅受温度影响。

Partition coefficient Kpc: The ratio of concentrations of a solute in two immiscible solvents at equilibrium. Kpc = [solute in solvent 1] / [solute in solvent 2]. ‘Partition = splitting between two layers’.

分配系数 Kpc：溶质在两种不互溶溶剂中达平衡时的浓度比。Kpc = [溶剂1中溶质] / [溶剂2中溶质]。联想“分配—两层之间”。

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4. Reaction Kinetics | 反应动力学

Rate equation: Rate = k [A]ᵐ[B]ⁿ. m and n are orders of reaction with respect to A and B, determined experimentally. ‘Orders tell you how rate responds to concentration; not stoichiometry’.

速率方程：速率 = k [A]ᵐ[B]ⁿ。m 和 n 是对 A 和 B 的反应级数，必须通过实验确定。“级数告诉你速率如何随浓度变化，与配平系数无关”。

Rate constant k: The constant in the rate equation; its units vary with overall order. A large k means a fast reaction. k increases with temperature (Arrhenius).

速率常数 k：速率方程中的常数；单位随总级数变化。k 越大反应越快。k 随温度升高而增大（阿伦尼乌斯）。

Activation energy (Ea): The minimum energy required for a collision to result in a reaction. ‘Activation is the spark needed to start the engine’.

活化能 (Ea)：碰撞导致反应所需的最低能量。“活化是启动引擎需要的火花”。

Catalyst: A substance that increases the rate of a reaction without being consumed, by providing an alternative pathway with lower activation energy. ‘Catalyst creates a short-cut’.

催化剂：通过提供低活化能的替代路径来增加反应速率，自身不被消耗的物质。“催化剂建了一条近路”。

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5. Transition Elements | 过渡元素

Transition element: A d-block element that forms one or more stable ions with an incomplete d sub-shell. Zn and Sc are d-block but not transition: Zn²⁺ is 3d¹⁰ (full), Sc³⁺ is 3d⁰ (empty).

过渡元素：能形成一种或多种具有不完全 d 亚层稳定离子的 d 区元素。Zn 和 Sc 是 d 区元素而非过渡元素：Zn²⁺为 3d¹⁰（全满），Sc³⁺为 3d⁰（全空）。

Ligand: A species with at least one lone pair of electrons that can form a coordinate bond to a central metal ion. Common ligands: H₂O:, :NH₃, :Cl⁻. ‘Ligand attaches like a hand grabbing metal’.

配体：至少含有一对孤对电子，能与中心金属离子形成配位键的物种。常见配体：H₂O:、:NH₃、:Cl⁻。“配体像一只手抓住金属”。

Coordination number: The number of coordinate bonds formed to the central metal ion in a complex. E.g., [Cu(H₂O)₆]²⁺ has coordination number 6.

配位数：配合物中与中心金属离子形成的配位键数目。例如 [Cu(H₂O)₆]²⁺ 的配位数为 6。

Stereoisomerism in complexes: Cis-trans isomerism in square planar (e.g., cisplatin) and octahedral complexes with two different types of ligands. Optical isomerism exists in octahedral complexes with bidentate ligands like [Ni(en)₃]²⁺.

配合物的立体异构：平面正方形（如顺铂）和含有两种不同配体的八面体配合物中存在顺反异构。含有双齿配体的八面体配合物如 [Ni(en)₃]²⁺ 存在光学异构。

Stability constant Kstab: The equilibrium constant for the formation of a complex ion from its metal ion and ligands in aqueous solution. A larger Kstab means a more stable complex.

稳定常数 Kstab：水溶液中由金属离子和配体生成配合离子的平衡常数。Kstab 越大，配合物越稳定。

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6. Arenes & Phenols | 芳烃与酚

Aromaticity: The property of a planar cyclic molecule with (4n+2) π electrons, leading to enhanced stability due to delocalisation. Benzene is the classic example. Remember ‘4n+2 = aromatic perfume of stability’.

芳香性：具有 (4n+2) 个 π 电子的平面环状分子，因离域而表现出额外稳定性。苯是典型例子。联想“4n+2 规则带来芳香稳定性”。

Electrophilic substitution: The reaction mechanism for arenes where an electrophile replaces a hydrogen atom on the ring. Steps: generation of electrophile, attack to form Wheland intermediate, loss of proton to restore aromaticity.

亲电取代：芳烃的反应机理，亲电试剂取代苯环上的氢原子。步骤：生成亲电试剂、进攻形成 Wheland 中间体、失去质子恢复芳香性。

Phenol acidity: Phenol is a weak acid (pKa ~ 10), more acidic than alcohols because the phenoxide ion is stabilised by resonance with the ring. ‘Phenol + Na → effervescence; alcohol + Na → slower H₂ evolution’.

苯酚的酸性：苯酚是弱酸（pKa ~ 10），比醇类酸性强，因为酚氧负离子通过与苯环的共振而稳定。“苯酚加钠冒泡快，醇加钠出气慢”。

Bromination of phenol: Phenol reacts with aqueous bromine to give a white precipitate of 2,4,6-tribromophenol, without a catalyst. The -OH group strongly activates the ring.

苯酚的溴化：苯酚与溴水反应，无需催化剂即生成 2,4,6-三溴苯酚白色沉淀。-OH 是强致活基团。

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7. Carbonyls and Carboxylic Acids | 羰基化合物与羧酸

Nucleophilic addition: The characteristic mechanism for aldehydes and ketones with HCN or NaBH₄. The nucleophile attacks the δ+ carbon of C=O; the π bond breaks heterolytically. ‘Nu attacks the + carbon’.

亲核加成：醛酮与 HCN 或 NaBH₄ 的特征机理。亲核试剂进攻 C=O 中 δ+ 的碳；π 键发生异裂。“亲核攻正碳”。

Tollens’ reagent: [Ag(NH₃)₂]⁺, used to distinguish aldehydes from ketones. Aldehydes produce a silver mirror; ketones give no visible change. ‘Tollens tells the true aldehyde with a silver mirror’.

托伦斯试剂：[Ag(NH₃)₂]⁺，用于区分醛和酮。醛生成银镜；酮无可见变化。“托伦斯用银镜认出真醛”。

Esterification: Carboxylic acid + alcohol ⇌ ester + water, catalysed by concentrated H₂SO₄. Reversible; equilibrium can be pushed by excess reactant or removing water. ‘Ester smells sweet’.

酯化反应：羧酸 + 醇 ⇌ 酯 + 水，浓硫酸催化。可逆反应；可通过反应物过量或移去水使平衡正向移动。“酯有水果香”。

Acyl chloride: RCOCl, highly reactive derivative of carboxylic acid. Reacts violently with water, alcohols, and ammonia to yield acids, esters, and amides respectively. ‘Acyl chloride is acid chloride—extremely vigorous’.

酰氯：RCOCl，羧酸的高活性衍生物。与水、醇、氨剧烈反应，分别生成羧酸、酯和酰胺。“酰氯即酸性氯化物——反应极其剧烈”。

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8. Organic Nitrogen Compounds | 有机含氮化合物

Amine basicity: Primary aliphatic amines are stronger bases than ammonia due to the electron-donating alkyl group increasing electron density on N. Phenylamine is weaker because the lone pair delocalises into the ring. ‘Alkyl pushes electrons, phenyl pulls them’.

胺的碱性：脂肪族伯胺的碱性比氨强，因为烷基的推电子效应增加了氮上的电子密度。苯胺碱性较弱，因为孤对电子离域到苯环中。“烷基推电子，苯基拉电子”。

Amide: Contains the -CONH- linkage. Primary amides are made from acyl chlorides and ammonia. Amides are neutral, not basic, because the lone pair on N is delocalised onto the carbonyl oxygen.

酰胺：含有 -CONH- 键。伯酰胺由酰氯与氨制备。酰胺呈中性，不显碱性，因为氮上的孤对电子离域到了羰基氧上。

Zwitterion: A dipolar ion containing both a positive and a negative charge within the same molecule. Amino acids exist as zwitterions in aqueous solution near their isoelectric point. ‘Zwitter = ‘two’ in German; two charges’.

两性离子：同一分子内同时含有正电荷和负电荷的偶极离子。氨基酸在其等电点附近的水溶液中以两性离子形式存在。“Zwitter 德语意为‘两个’；两性离子带两种电荷”。

Condensation polymerisation: A reaction in which monomers join together with the elimination of a small molecule, often water, to form a long chain. Polyamides (nylon) and polyesters (Terylene) are examples.

缩合聚合：单体通过脱去小分子（通常是水）连接成长链的反应。聚酰胺（尼龙）和聚酯（涤纶）是例子。

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9. Polymerisation | 聚合反应

Addition polymerisation: Monomers containing C=C bonds add together without the loss of any small molecules to form a polymer. E.g., poly(ethene) from ethene. ‘Addition means just adding up; no by-products’.

加聚反应：含有 C=C 键的单体不发生小分子脱去，直接加成形成聚合物。例如乙烯加聚成聚乙烯。“加聚就是直接加起来，无副产物”。

Biodegradable polymer: A polymer that can be broken down by microorganisms into water, CO₂ and biomass. Poly(lactic acid) (PLA) from corn starch is an example. ‘Bio-degradable = bio breaks it down’.

可生物降解聚合物：能被微生物分解为水、CO₂ 和生物质的聚合物。如来自玉米淀粉的聚乳酸 (PLA)。“生物可降解——生物能把它降了”。

Repeat unit: The smallest group of atoms that repeats itself in a polymer chain when drawn. Must show the structure exactly as it appears in the chain, with open bonds at both ends.

重复单元：聚合物链中重复出现的最小原子团。必须准确画出链中结构，两端带开放键。

Vulcanisation: Adding sulfur to natural rubber to form cross-links between polymer chains, increasing elasticity and strength. ‘Vulcanisation makes rubber tough, like Vulcan’s metal’.

硫化：向天然橡胶中添加硫，在聚合物链间形成交联，提高弹性和强度。“硫化让橡胶像 Vulcan 神的金属一样强韧”。

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10. Analytical Techniques | 分析技术

Retention time (Rt): In gas-liquid chromatography, the time taken for a component to travel from injection to the detector. Each compound has a characteristic Rt under fixed conditions.

保留时间 (Rt)：在气-液色谱中，组分从进样到检测器所需的时间。每种化合物在固定条件下有特征 Rt。

Fingerprint region: In IR spectroscopy, the region below 1500 cm⁻¹ that is unique to each molecule. Used to identify compounds by matching with spectral databases.

指纹区：红外光谱中低于 1500 cm⁻¹ 的区域，对每个分子是独特的。用于通过与谱库匹配来鉴定化合物。

Molecular ion peak (M⁺): In mass spectrometry, the peak with the highest m/z value (ignoring isotopes) corresponding to the unfragmented molecule. Gives the relative molecular mass.

分子离子峰 (M⁺)：质谱中 m/z 值最大的峰（忽略同位素峰），对应于未碎裂的分子，给出相对分子质量。

Chemical shift (δ): In NMR, the position of a signal relative to TMS, measured in ppm. It depends on the electron environment of the nucleus. Electron-donating groups shift upfield (lower δ).

化学位移 (δ)：在 NMR 中信号相对于 TMS 的位置，单位 ppm。取决于原子核的电子环境。推电子基团使信号向高场移动（δ 值减小）。

Spin-spin coupling: The splitting of NMR signals caused by neighbouring non-equivalent hydrogens. The n+1 rule: a signal is split into n+1 peaks by n neighbouring H atoms.

自旋-自旋耦合：由邻近的非等价氢引起的 NMR 信号分裂。n+1 规则：信号被 n 个相邻 H 分裂成 n+1 个峰。

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11. Thermodynamic vs Kinetic Control | 热力学与动力学控制

Thermodynamic stability: Refers to the relative energies of reactants and products. A product is thermodynamically more stable if it has lower energy. In reactions with a large activation energy for the reverse, the product may form slowly but be favoured over time.

热力学稳定性：指反应物和产物的相对能量。能量越低的产物热力学上越稳定。在逆反应活化能较大的反应中，产物可能形成慢，但随时间推移占优势。

Kinetic product: The product that forms fastest because it has a lower activation energy pathway, even if it is not the most stable. Often formed at low temperatures where reverse reaction is negligible. ‘Kinetic = quick; thermodynamic = tough (stable)’.

动力学产物：形成最快的产物，因为其路径活化能较低，即便它不是最稳定的。通常在低温下生成，此时逆反应可忽略。“动力学快，热力学稳”。

Enolate formation: In unsymmetrical ketones, LDA (strong base, low temperature) gives kinetic enolate (less substituted), while NaH or NaOEt with heat gives thermodynamic enolate (more substituted). This exemplifies kinetic versus thermodynamic control.

烯醇负离子形成：不对称酮中，LDA（强碱，低温）生成动力学烯醇负离子（取代较少），而 NaH 或 NaOEt 加热生成热力学烯醇负离子（取代较多）。这是动力学与热力学控制的例子。

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12. Summary and Revision Tips | 总结与复习技巧

Create flashcards with the term on one side and the definition with a memory hook on the other. Group terms by colour-coded themes. Practice writing definitions in past-paper questions to gain precision marks. Teach a friend unfamiliar terms — the Feynman technique solidifies your own understanding.

制作抽认卡，正面写术语，背面写定义和记忆挂钩。用颜色分主题归类。在真题中练习书写定义，夺取精准分。用费曼技巧向朋友讲解不熟悉的术语，巩固自己的理解。

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