Pre-U AQA Chemistry: Quick Memorisation Guide to Key Terms and Vocabulary | Pre-U AQA 化学：关键术语词汇速记指南

📚 Pre-U AQA Chemistry: Quick Memorisation Guide to Key Terms and Vocabulary | Pre-U AQA 化学：关键术语词汇速记指南

Memorising the precise terminology in Pre-U AQA Chemistry is just as vital as understanding the underlying concepts. The exam board expects you to use key terms accurately and in context – a single misplaced word can lose marks in definitions and explanations. This guide collates the most frequently examined terms, grouped by topic, and pairs each with a memorable explanation or mnemonic. Read through each section actively, test yourself by covering the definitions, and use the paired Chinese explanations to deepen comprehension through your stronger language.

在 Pre-U AQA 化学中，准确记忆术语与理解核心概念同样关键。考试局要求你在上下文中精准使用关键词汇——一个用词不当就可能丢掉定义题和解释题的分数。本指南按主题整理了最高频的考察术语，每个术语都配有易记的解释或助记口诀。请主动阅读每个部分，遮住定义自测，并借助配对的中文解释通过你更强势的语言加深理解。

1. Atomic Structure and Terminology | 原子结构与术语

The atomic number (Z) is the number of protons in the nucleus of an atom. It defines the element, and in a neutral atom it also equals the number of electrons. Always remember Z = protons = identity.

原子序数 (Z) 是原子核内的质子数。它定义了元素种类，在中性原子中它也等于电子数。牢记 Z = 质子数 = 元素身份。

The mass number (A) is the total number of protons and neutrons in the nucleus. Neutron number is simply A − Z. Use the trick: ‘A is All the heavy stuff – protons and neutrons together.’

质量数 (A) 是原子核内质子数与中子数的总和。中子数就是 A − Z。用口诀记忆：’A 是 All（全部）重粒子——质子和中子在一起。’

Isotopes are atoms of the same element with the same number of protons but different numbers of neutrons. They have identical chemical properties because electron arrangements are the same, but physical properties like mass differ slightly. Think: ‘ISO topes = same protons, different neutrons.’

同位素是同一种元素中质子数相同而中子数不同的原子。它们的化学性质几乎相同，因为电子排布一样，但物理性质（如质量）略有差异。联想：’ISO（相同）→ 质子相同，中子不同。’

The relative atomic mass (Ar) is the weighted average mass of an atom compared to 1/12th the mass of a carbon‑12 atom. It takes into account isotopic abundance. A common mistake is to confuse it with mass number; Ar may not be a whole number.

相对原子质量 (Ar) 是以碳‑12 原子质量的 1/12 为基准，对一种元素所有同位素质量的加权平均值。它考虑了同位素丰度，通常不是整数。不要将其与质量数混淆。

2. Bonding and Structure | 化学键与结构

Ionic bonding is the electrostatic attraction between oppositely charged ions. It forms between a metal and a non‑metal, and the giant ionic lattice gives high melting points and conductivity when molten or dissolved. Remember ‘Opposites attract’ and ‘ions not molecules’ for ionic compounds.

离子键是带相反电荷离子之间的静电吸引力。通常形成于金属与非金属之间，巨大的离子晶格导致高熔点以及在熔融或溶解时的导电性。记住’异性相吸’，离子化合物中不存在分子。

Covalent bonding is the sharing of pairs of electrons between atoms. A single covalent bond contains one shared pair. The term dative covalent (or coordinate) bond describes a shared pair where both electrons come from the same atom. Picture a ‘giving’ atom donating a lone pair to an electron‑deficient atom.

共价键是原子间通过共用电子对形成的化学键。一个单键包含一对共用电子。配位共价键（又称 dative bond）指共用电子对由同一原子单独提供。想象一个’给予’原子将孤对电子提供给缺电子原子。

Electronegativity is the ability of an atom to attract the bonding pair of electrons in a covalent bond. Fluorine is the most electronegative element. Use the mnemonic ‘FONClBrISCH’ (pronounced ‘fonkle‑brisk’) for the most electronegative elements. A large difference in electronegativity leads to polar bonds.

电负性是原子在共价键中吸引共用电子对的能力。氟是电负性最强的元素。记忆口诀 ‘FONClBrISCH’ （读作 fonkle‑brisk）涵盖主要电负性元素。电负性差值大导致极性键。

Metallic bonding is the attraction between positive metal ions and a sea of delocalised electrons. This explains electrical conductivity, malleability and ductility. Visualise ‘cations in a sea of mobile electrons’.

金属键是正金属离子与离域电子海之间的吸引力。这解释了导电性、延展性和可塑性。想象’阳离子漂浮在可自由流动的电子海洋中’。

3. Energetics and Thermodynamics | 能量学与热力学

Enthalpy change (ΔH) is the heat energy transferred in a reaction at constant pressure. An exothermic reaction has a negative ΔH (energy released to surroundings); an endothermic reaction has a positive ΔH (energy absorbed). Link ‘exo‑ exit’ and ‘endo‑ enter’.

焓变 (ΔH) 是在恒压下反应中转移的热量。放热反应的 ΔH 为负（向环境释放能量）；吸热反应的 ΔH 为正（从环境吸收能量）。联想：’exo‑ 出去’，’endo‑ 进入’。

Standard enthalpy of formation (ΔH_f°) is the enthalpy change when one mole of a compound is formed from its elements in their standard states under standard conditions. A common trap: the value for an element in its standard state is zero.

标准生成焓 (ΔH_f°) 是在标准条件下，由元素的标准态生成 1 mol 化合物时的焓变。常设陷阱：标准状态下元素自身的标准生成焓为零。

Bond enthalpy is the energy required to break one mole of a given covalent bond in the gaseous phase. Mean bond enthalpy is an average over a range of compounds. Always remember that bond breaking is endothermic and bond making is exothermic. Use: ‘breaking absorbs, making releases’.

键焓是断裂气态中 1 mol 某种共价键所需的能量。平均键焓是一系列化合物中的平均值。务必记住：断键吸热，成键放热。口诀：’断裂吸收，形成释放’。

Hess’s Law states that the enthalpy change for a reaction is independent of the route taken, provided the initial and final conditions are the same. It is the foundation of enthalpy cycles. Think ‘enthalpy change is a state function – path doesn’t matter’.

盖斯定律指出，一个反应的焓变与所采取的路径无关，只要初态和终态相同。这是焓循环的基础。思考：’焓变是状态函数——路径不重要’。

4. Kinetics and Equilibrium | 动力学与平衡

The rate of reaction is defined as the change in concentration of a reactant or product per unit time. The collision theory states that for a reaction to occur, particles must collide with sufficient energy (greater than or equal to the activation energy) and the correct orientation.

反应速率定义为单位时间内反应物或产物浓度的变化量。碰撞理论指出，要发生反应，粒子必须以足够的能量（大于或等于活化能）和正确的取向碰撞。

Activation energy (Ea) is the minimum energy that colliding particles must possess for a reaction to take place. A catalyst provides an alternative reaction pathway with a lower activation energy, thereby increasing the rate without being used up. Remember ‘catalyst creates a lower energy shortcut’.

活化能 (Ea) 是碰撞粒子必须拥有的最低能量，以使反应发生。催化剂提供一条活化能更低的新反应路径，从而加快反应速率而自身不被消耗。记忆：’催化剂造了一条低能量的捷径’。

Dynamic equilibrium occurs in a closed system when the rate of the forward reaction equals the rate of the backward reaction, and the concentrations of reactants and products remain constant. Le Chatelier’s principle states that if a system at equilibrium is disturbed, the position of equilibrium shifts to counteract the change. Use the ‘opposing shift’ rule.

动态平衡发生在一个封闭系统中，此时正反应速率等于逆反应速率，反应物和产物的浓度保持恒定。勒夏特列原理指出，如果改变平衡体系的条件，平衡会向减弱这种改变的方向移动。使用’对抗改变’规则。

5. Acids, Bases and pH | 酸、碱和pH

A Bronsted‑Lowry acid is a proton (H⁺) donor; a Bronsted‑Lowry base is a proton acceptor. This definition is more general than Arrhenius and covers species like ammonia. The phrase ‘A for Acid, A for Acceptor? No – A for Acid, D for Donor’ helps avoid confusion.

布朗斯特‑劳里酸是质子 (H⁺) 供体；布朗斯特‑劳里碱是质子受体。这一定义比阿伦尼乌斯定义更广义，涵盖了氨等物质。口诀：’酸供碱受’，英文用 Acid Donor, Base Acceptor。

A strong acid completely dissociates in water, while a weak acid only partially dissociates. The terms ‘strong’ and ‘weak’ refer to the degree of dissociation, not concentration. Equally, a concentrated acid contains a large amount of acid per unit volume, which is a different concept.

强酸在水中完全电离，弱酸只是部分电离。’强’和’弱’指电离程度，而非浓度。同样地，浓酸指的是单位体积中酸的含量很大，这是不同的概念。

pH is defined as −log₁₀[H⁺]. Remember that a change of one pH unit corresponds to a ten‑fold change in hydrogen ion concentration. Kw = [H⁺][OH⁻] and at 298 K, Kw = 1.0 × 10⁻¹⁴ mol² dm⁻⁶.

pH 定义为 −log₁₀[H⁺]。记住，一个 pH 单位的变化对应氢离子浓度十倍的变化。水的离子积 Kw = [H⁺][OH⁻]，在 298 K 时，Kw = 1.0 × 10⁻¹⁴ mol² dm⁻⁶。

A buffer solution resists changes in pH when small amounts of acid or base are added. It consists of a weak acid and its conjugate base, or a weak base and its conjugate acid. Think ‘buffer = weak pair that absorbs extra H⁺ or OH⁻’.

缓冲溶液能抵抗因加入少量酸或碱而引起的 pH 变化。它由弱酸及其共轭碱，或弱碱及其共轭酸组成。思考：’缓冲 = 一对弱电解质搭档吸收多余的 H⁺ 或 OH⁻’。

6. Redox and Electrochemistry | 氧化还原与电化学

Oxidation is loss of electrons; reduction is gain of electrons. The mnemonic ‘OIL RIG’ (Oxidation Is Loss, Reduction Is Gain) is universally used. Always write half‑equations to track electron transfer.

氧化是失电子，还原是得电子。助记符’OIL RIG’（氧化失电子，还原得电子）被普遍使用。务必书写半反应方程式来跟踪电子转移。

An oxidising agent accepts electrons and is itself reduced; a reducing agent donates electrons and is itself oxidised. The agents ‘do the opposite’ to their names: oxidising agent becomes reduced. Use ‘the agent undergoes the opposite of what it does to the other species’.

氧化剂接受电子，自身被还原；还原剂给出电子，自身被氧化。试剂’名不符实’：氧化剂被还原。记忆：’试剂自身的变化与它对其他物质所做的事相反’。

The standard electrode potential (E°) measures the tendency of a half‑cell to gain electrons relative to the standard hydrogen electrode. A more positive E° means a greater tendency to be reduced. The cell potential E°cell = E°right − E°left (reduction potentials). Remember ‘right minus left’ if you write reduction potentials.

标准电极电势 (E°) 衡量半电池相对于标准氢电极得电子的倾向。E° 越正，越容易被还原。电池电动势 E°cell = E°右 − E°左（如果用的是还原电势）。记住’右减左’。

A fuel cell converts chemical energy directly into electrical energy. Hydrogen fuel cells are common; the overall reaction is 2H₂ + O₂ → 2H₂O. The only product is water, making them environmentally friendly. However, the technology requires a constant supply of fuel and an efficient catalyst.

燃料电池将化学能直接转化为电能。氢氧燃料电池常用，总反应为 2H₂ + O₂ → 2H₂O。唯一产物是水，环境友好，但需要持续燃料供应和高效催化剂。

7. Organic Chemistry: Functional Groups | 有机化学：官能团

A homologous series is a family of organic compounds with the same functional group, similar chemical properties, and a general formula where successive members differ by CH₂. Each member is a homologue. This pattern helps you predict properties.

同系物是一系列具有相同官能团、相似化学性质且通式有规律的有机化合物，相邻成员相差一个 CH₂。每个成员叫一个同系物。这一规律可帮助你预测性质。

The functional group is the atom or group of atoms responsible for the characteristic reactions of a compound. Key groups for AQA include: alkene (C=C), halogenoalkane (R–X), alcohol (–OH), aldehyde (–CHO), ketone (C=O between carbons), carboxylic acid (–COOH), ester (–COOR), amine (–NH₂), nitrile (–CN).

官能团是决定化合物特征反应的原子或原子团。AQA 考试中关键官能团包括：烯烃 (C=C)、卤代烃 (R–X)、醇 (–OH)、醛 (–CHO)、酮 （碳之间的 C=O）、羧酸 (–COOH)、酯 (–COOR)、胺 (–NH₂)、腈 (–CN)。

Isomerism: Structural isomers have the same molecular formula but different structural arrangements (chain, position, functional group). Stereoisomerism includes E/Z isomerism (restricted rotation around a double bond with different groups on each carbon) and optical isomerism (chiral carbon with four different groups). Remember ‘structural = different connectivity; stereo = same connectivity, different spatial arrangement’.

同分异构：构造异构体分子式相同但原子排列不同（碳链、位置、官能团异构）。立体异构包括 E/Z 异构（双键两端碳各连不同基团且旋转受限）和光学异构（手性碳连有四个不同基团）。记忆：’构造异构 = 连接方式不同；立体异构 = 连接相同，空间排布不同’。

8. Organic Reaction Mechanisms | 有机反应机理

A reaction mechanism shows the movement of electron pairs using curly arrows. A curly arrow flows from a lone pair or a bond to an electron‑deficient atom or position. Never draw an arrow from a positive charge – it must start from a source of electrons.

反应机理用弯箭头表示电子对的移动。弯箭头从孤对电子或一根键开始，指向缺电子的原子或位置。绝不能从正电荷出发画箭头——它必须始于电子源。

Nucleophile: an electron‑pair donor attracted to electron‑deficient regions. Examples include OH⁻, CN⁻, NH₃. Electrophile: an electron‑pair acceptor that attacks regions of high electron density. Examples: H⁺, NO₂⁺, Br₂ (polarised). Remember ‘nucleus‑loving’ (positive‑loving) vs. ‘electron‑loving’.

亲核试剂：电子对供体，被缺电子区域吸引，例如 OH⁻、CN⁻、NH₃。亲电试剂：电子对受体，进攻电子密度高的区域，例如 H⁺、NO₂⁺、Br₂ （极化后）。记忆：’核爱好’其实指喜欢正电，亲核试剂是富电子的；亲电试剂爱电子。

Free radical substitution involves three stages: initiation (homolytic fission by UV light forming radicals), propagation (radical reacts with a molecule producing another radical), and termination (two radicals combine). This is typical of alkane halogenation. Use the story: ‘UV light starts a chain reaction of radicals passing on their unpaired electron like a baton.’

自由基取代分三个阶段：引发（紫外光使共价键均裂产生自由基）、传递（自由基与分子反应生成新自由基）和终止（两个自由基结合）。这是烷烃卤代反应的典型机理。联想：’紫外光发起自由基接力赛，单电子像接力棒一样传递。’

Electrophilic addition is the characteristic reaction of alkenes. The C=C double bond is an electron‑rich region that attracts an electrophile. The mechanism involves the formation of a carbocation intermediate. Remember Markovnikov’s rule: the hydrogen adds to the carbon with more hydrogens already attached (the rich get richer).

亲电加成是烯烃的特征反应。C=C 双键是富电子区域，吸引亲电试剂。机理涉及碳正离子中间体。记住马氏规则：氢加在原本氢多的碳上（富者愈富）。

9. Analytical Techniques | 分析技术

Mass spectrometry determines the relative atomic mass of an element and provides structural information for organic compounds. The molecular ion peak (M⁺) gives the relative molecular mass. Fragment ions form by bond breaking and can be used to deduce structure. For an element, the spectrum shows relative abundance of isotopes.

质谱法可测定元素的相对原子质量并提供有机化合物的结构信息。分子离子峰 (M⁺) 给出相对分子质量。碎片离子由化学键断裂形成，可用于推断结构。对元素而言，质谱图显示同位素的相对丰度。

Infrared (IR) spectroscopy identifies functional groups by absorption of infrared radiation. Bonds vibrate at characteristic frequencies. The fingerprint region (below 1500 cm⁻¹) is unique to each compound. Key absorptions: O–H (broad ~3200–3600 cm⁻¹), C=O (~1700 cm⁻¹), C–O (~1000–1300 cm⁻¹). Think ‘IR makes bonds dance – each bond has its own dance move’.

红外光谱 (IR) 通过吸收红外辐射来鉴别官能团。化学键以特定频率振动。指纹区（低于 1500 cm⁻¹）对每种化合物是独一无二的。关键吸收：O–H（宽峰 ~3200–3600 cm⁻¹）、C=O (~1700 cm⁻¹)、C–O (~1000–1300 cm⁻¹）。想象：’红外让化学键跳舞——每种键有自己的舞步。’

NMR spectroscopy provides information about the number and environment of hydrogen atoms (¹H NMR) or carbon atoms (¹³C NMR). Chemical shift (δ) measured in ppm indicates the electronic environment. Spin‑spin splitting follows the n+1 rule, where n is the number of neighbouring hydrogens. Splitting patterns: singlet, doublet, triplet, quartet, etc. Use: ‘protons talk to neighbours via bonding electrons – each neighbour splits the signal one more time.’

核磁共振谱提供氢原子 (¹H NMR) 或碳原子 (¹³C NMR) 数目及化学环境的信息。化学位移 (δ) 以 ppm 为单位，反映电子环境。自旋‑自旋裂分遵循 n+1 规则，n 是相邻碳上的氢原子数。裂分模式：单峰、二重峰、三重峰、四重峰等。联想：’质子通过成键电子与邻居对话——每个邻居将信号再劈一次。’

Chromatography separates components in a mixture. Thin‑layer chromatography (TLC) and gas‑liquid chromatography (GLC) are common. Retention factor (Rf) in TLC is the ratio of the distance moved by the spot to the distance moved by the solvent front. In GLC, retention time helps identify components. Picture ‘molecules on a race track – some stick to the stationary phase and move slowly.’

色谱法分离混合物中的组分。薄层色谱 (TLC) 和气液色谱 (GLC) 常见。TLC 中的比移值 (Rf) 是组分移动距离与溶剂前沿移动距离之比。GLC 中保留时间帮助识别组分。联想：’分子在赛道比赛——有些粘固定相，跑得慢。’

10. Periodicity and Group Trends | 周期性与族趋势

Across Period 3, atomic radius decreases because nuclear charge increases while shielding remains similar; electrons are pulled closer to the nucleus. From sodium to chlorine, there is a trend: metals on the left, non‑metal on the right, with silicon being a metalloid.

在第三周期中，原子半径从左到右递减，这是因为核电荷增加而屏蔽效应基本不变，电子被拉得更靠近原子核。从钠到氯，趋势明显：左端是金属，右端是非金属，硅是准金属。

First ionisation energy generally increases across a period due to increasing nuclear charge and decreasing radius. The drop between Groups 2 and 3 (e.g., Be to B) is due to the new electron entering a p orbital of higher energy; the drop between Groups 5 and 6 (e.g., N to O) arises from electron‑pair repulsion in a doubly occupied p orbital. Use the ‘dips explained by sub‑shell changes’ rule.

第一电离能通常在同周期中增大，因核电荷增加和半径减小。第 2 族到第 3 族（如 Be 到 B）的下降是因为新增电子进入较高能级的 p 轨道；第 5 族到第 6 族（如 N 到 O）的下降是由于 p 轨道已有一个成对电子带来的斥力。用’亚层变化解释凹陷’规则。

Group 2 elements (alkaline earth metals) become more reactive down the group as the first and second ionisation energies decrease, making it easier to lose the two outer electrons. Hydroxides and sulfates show trends in solubility: magnesium hydroxide is sparingly soluble, barium hydroxide is more soluble. For sulfates, magnesium sulfate is soluble, barium sulfate is insoluble. The mnemonic ‘Hydroxides SOLubility increases down, Sulfates SOLubility decreases down’ (‘HSOL’ opposite).

第 2 族元素（碱土金属）的金属活泼性从上往下增强，因为第一和第二电离能降低，失去两个外层电子更容易。氢氧化物和硫酸盐的溶解性呈现趋势：氢氧化镁微溶，氢氧化钡较溶；硫酸镁可溶，硫酸钡不溶。口诀：’氢氧化物溶解性向下增，硫酸盐向下减’（正好相反）。

Group 7 elements (halogens) become less reactive down the group because the atoms get larger, so the attraction for an extra electron decreases. Halogens are oxidising agents, and a more reactive halogen can displace a less reactive halide from solution. Trend: F₂ > Cl₂ > Br₂ > I₂ in reactivity. Remember ‘halogen displaces below itself in the Periodic Table’.

第 7 族元素（卤素）的活泼性从上往下减弱，因为原子增大，对外来电子的吸引力减弱。卤素是氧化剂，较活泼的卤素可以从溶液中置换较不活泼的卤素离子。活泼性顺序：F₂ > Cl₂ > Br₂ > I₂。记忆：’卤素能置换位于自己下方的卤化物’。

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11. Key Organic Reactions and Conditions | 常见有机反应及条件

Knowing the reagents, conditions and type of reaction for each transformation is essential. Here is a concise summary table for quick memorisation.

掌握每个转化的试剂、条件和反应类型至关重要。以下简洁总结表便于快速记忆。

Transformation / 转化	Reagent/Condition / 试剂/条件	Type / 类型
Alkene → Alkane / 烯烃→烷烃	H₂, Ni catalyst, heat / 氢气, 镍催化, 加热	Addition / 加成
Alkene → Halogenoalkane / 烯烃→卤代烃	HX (g) or HX (aq), room temp / 卤化氢气体或水溶液，室温	Electrophilic addition / 亲电加成
Halogenoalkane → Alcohol / 卤代烃→醇	NaOH (aq), warm / 氢氧化钠水溶液，加热	Nucleophilic substitution / 亲核取代
Alcohol → Alkene / 醇→烯烃	Conc. H₂SO₄, heat, or Al₂O₃, heat / 浓硫酸加热，或氧化铝加热	Elimination / 消除
Primary Alcohol → Aldehyde / 伯醇→醛	K₂Cr₂O₇/H₂SO₄, distil off product / 酸化重铬酸钾，蒸馏出产物	Oxidation / 氧化
Primary Alcohol → Carboxylic acid / 伯醇→羧酸	K₂Cr₂O₇/H₂SO₄, reflux / 酸化重铬酸钾，回流	Oxidation / 氧化
Aldehyde → Carboxylic acid / 醛→羧酸	K₂Cr₂O₇/H₂SO₄, reflux / 酸化重铬酸钾，回流	Oxidation / 氧化
Carboxylic acid + Alcohol → Ester / 羧酸+醇→酯	Conc. H₂SO₄ catalyst, heat / 浓硫酸催化，加热	Esterification (condensation) / 酯化（缩合）

Use the table as flashcard material: cover the third column and guess the type, or reverse. Making connections between functional groups builds a solid organic map.

此表可用作抽认卡：遮住第三列，猜测反应类型；或反向练习。在官能团之间建立联系能构建稳固的有机化学知识网络。

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12. Exam Language and Common Pitfalls | 考试用语与常见陷阱

Pre-U AQA questions often ask for definitions ‘in terms of bonding’ or ‘in terms of structure’. Always use the precise wording expected: e.g., ‘electrostatic attraction between oppositely charged ions’ rather than ‘metal and non‑metal bond’. The command word ‘explain’ requires a scientific reason, not just a description.

Pre-U AQA 试题经常要求’从键合角度’或’从结构角度’给出定义。始终使用预期的标准措辞，例如’带相反电荷离子之间的静电吸引力’，而非’金属和非金属的键’。指令词’解释’要求提供科学原因，而不只是描述。

Watch out for the difference between ‘concentration’ and ‘strength’ of acids, ‘intermolecular forces’ vs ‘intramolecular bonds’, and ‘thermodynamic stability’ vs ‘kinetic inertness’. Many marks are lost by mixing these up. Create your own glossary of tricky pairs and test yourself before the exam.

当心酸的’浓度’与’强度’、’分子间作用力’与’分子内化学键’、’热力学稳定性’与’动力学惰性’的区别。混淆这些术语会丢掉许多分数。建立自己的’易混词组’词汇表，在考前自测。

Published by TutorHao | Chemistry Revision Series | aleveler.com

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