📚 Year 12 OCR Chemistry: Vocabulary & Terminology Quick Memorization Guide | Year 12 OCR 化学：词汇术语速记指南
Mastering Year 12 OCR Chemistry starts with a confident command of the subject’s unique vocabulary. This bilingual guide walks you through the core terms—from atomic structure to organic chemistry—pairing every English definition with its Chinese equivalent to build deep conceptual links. Use the memory hacks and logical word roots provided to turn passive recognition into active recall, giving you an edge in multiple‑choice questions, structured answers, and practical‑based assessments.
掌握 Year 12 OCR 化学，首先要能自信驾驭这门学科独特的术语体系。这份双语指南带你梳理从原子结构到有机化学的核心词汇，为每一个英文定义配上对应的中文解释，帮助你建立深层的概念联结。文章穿插了记忆技巧和词根逻辑，让你从被动识记转为主动提取，在选择题、简答题和实验评估中占据优势。
1. Atomic Structure and Particles | 原子结构与粒子
Atom – the smallest unit of an element that retains its chemical properties, consisting of a nucleus surrounded by electrons. The word ‘atom’ shares the root a‑ (not) + tom (cut), literally ‘indivisible’.
原子 – 保持元素化学性质的最小单元，由原子核和核外电子构成。‘atom’一词源自希腊语 a‑ (无) + tom (切割)，原意‘不可分割’。
- Proton: positively charged sub‑atomic particle found in the nucleus, relative mass ≈ 1, relative charge +1.
- 质子：原子核内带正电的亚原子粒子，相对质量约 1，相对电荷 +1。
- Neutron: neutral particle in the nucleus, mass ≈ 1, charge 0.
- 中子：原子核内的中性粒子，质量约 1，电荷 0。
- Electron: negatively charged particle orbiting the nucleus, relative mass 1/1836, charge -1.
- 电子：带负电、绕核运动的粒子，相对质量 1/1836，电荷 -1。
- Atomic (proton) number Z: number of protons in an atom’s nucleus, identifies the element.
- 原子序数 Z：原子核内质子数，决定元素身份。
- Mass number A: total number of protons + neutrons.
- 质量数 A：质子数 + 中子数的总和。
- Isotopes he : atoms of the same element (same Z) with different numbers of neutrons (different A). Memory tip: iso‑ = same, tope = place — they occupy the same position on the periodic table.
- 同位素：同一元素（Z 相同）但中子数不同（A 不同）的原子。记忆法：iso‑ 意为‘相同’，tope 意为‘位置’——它们在周期表中占据同一位置。
- Relative atomic mass Aᵣ: the weighted average mass of an atom of an element relative to ¹⁄₁₂ the mass of a carbon‑12 atom.
- 相对原子质量 Aᵣ：元素原子质量相对于碳‑12 原子质量的 1/12 的加权平均值。
2. Chemical Bonding and Structure | 化学键与结构
Ionic bonding – electrostatic attraction between oppositely charged ions, typically formed when a metal transfers electrons to a non‑metal. Visualise the ‘give and take’ relationship: the metal loses (cation), the non‑metal gains (anion).
离子键 – 阴、阳离子之间的静电吸引力，通常由金属向非金属转移电子形成。想象一种‘给予与获取’的关系：金属失电子（阳离子），非金属得电子（阴离子）。
- Cation: positive ion; think ‘cat’ has paws (paws‑itive).
- 阳离子：带正电的离子；联想：cat（猫）有爪子，向外抓出正电。
- Anion: negative ion; ‘an’ sounds like ‘on’ — extra electrons are ‘on’ it, making it negative.
- 阴离子：带负电的离子；‘an’ 类似‘on’，多出的电子‘加在身上’，带负电。
- Covalent bonding: sharing of electron pairs between atoms, usually non‑metals. The prefix co‑ means ‘together’, valent refers to valence electrons.
- 共价键：原子间共享电子对，通常存在于非金属之间。co‑ 前缀意为‘共同’，valent 指价电子。
- Dative covalent (coordinate) bond: a covalent bond where both electrons come from the same atom.
- 配位共价键：共价键的一种，成键电子对由同一原子提供。
- Electronegativity: ability of an atom to attract the bonding pair of electrons in a covalent bond. Pauling scale is used.
- 电负性：原子在共价键中吸引电子对的能力。使用鲍林标度。
- Metallic bonding: strong electrostatic attraction between a lattice of positive metal ions and a ‘sea’ of delocalised electrons.
- 金属键：正离子晶格与离域电子的‘海洋’之间的强静电吸引力。
- Giant covalent structure: network of atoms joined by covalent bonds throughout the whole structure, e.g. diamond, graphite, SiO₂.
- 巨型共价结构：整个结构由共价键连接的原子网络，如金刚石、石墨、SiO₂。
3. The Mole and Stoichiometry | 摩尔与化学计量
The mole – 6.02214076×10²³ elementary entities (Avogadro constant). Think of a mole like a chemist’s ‘dozen’, just a very large number for atoms and molecules.
摩尔 – 物质的量的国际单位，精确包含 6.02214076×10²³ 个基本单元（阿伏伽德罗常数）。可以将摩尔视为化学家的‘打’，只是对于原子和分子来说这个数非常大。
- Avogadro constant Nₐ: 6.02×10²³ mol⁻¹.
- 阿伏伽德罗常数 Nₐ：6.02×10²³ mol⁻¹。
- Molar mass M: mass of one mole of a substance, units g mol⁻¹, numerically equal to relative atomic/formula mass.
- 摩尔质量 M：一摩尔物质的质量，单位 g mol⁻¹，数值等于相对原子/式量质量。
- Empirical formula: simplest whole‑number ratio of atoms in a compound.
- 实验式（最简式）：化合物中各原子最简整数比。
- Molecular formula: actual number of atoms of each element in a molecule.
- 分子式：分子中各元素原子的实际数目。
- Water of crystallisation: water molecules that form part of the crystalline structure of a salt, e.g. CuSO₄·5H₂O.
- 结晶水：构成盐晶体结构一部分的水分子，如 CuSO₄·5H₂O。
- The ideal gas equation: pV = nRT p = pressure (Pa), V = volume (m³), n = moles, R = 8.31 J mol⁻¹ K⁻¹, T = temperature (K).
- 理想气体状态方程：pV = nRT，p 为压强 (Pa)，V 为体积 (m³)，n 为摩尔数，R = 8.31 J mol⁻¹ K⁻¹，T 为温度 (K)。
4. Enthalpy Changes and Energy | 焓变与能量
Enthalpy change ΔH – H means exothermic (heat exits); positive ΔH means endothermic (heat enters). The mnemonic ‘exo = exit, endo = in’ makes it stick.
焓变 ΔH – 恒压下的热量变化。负值表示放热（热量离开体系），正值表示吸热（热量进入体系）。记忆口诀：‘exo = exit，endo = enter’。
- Standard conditions: 100 kPa, 298 K, solutions at 1 mol dm⁻³. All standard enthalpy changes use the plimsoll symbol ⊖.
- 标准条件：100 kPa，298 K，溶液浓度 1 mol dm⁻³。所有标准焓变均使用标准符号 ⊖。
- Standard enthalpy of formation ΔfH⊖: enthalpy change when one mole of a compound is formed from its elements in their standard states.
- 标准生成焓 ΔfH⊖：由标准状态下的元素生成一摩尔化合物时的焓变。
- Standard enthalpy of combustion ΔcH⊖: enthalpy change when one mole of a substance is completely burned in oxygen under standard conditions.
- 标准燃烧焓 ΔcH⊖：标准条件下，一摩尔物质在氧气中完全燃烧时的焓变。
- Hess’s law: the enthalpy change for a reaction is independent of the route taken. It depends only on the initial and final states.
- 盖斯定律：反应焓变与途径无关，仅取决于始态和终态。
- Average bond enthalpy: energy required to break one mole of a specified covalent bond in the gaseous state, averaged over a range of compounds.
- 平均键焓：断裂一摩尔气态指定共价键所需能量，是多种化合物中的平均值。
5. Rates of Reaction and Collision Theory | 反应速率与碰撞理论
Rate of reaction – change in concentration of a reactant or product per unit time. For OCR, you measure it by monitoring volume of gas, mass loss, colour change, or pH.
反应速率 – 单位时间内反应物或产物浓度的变化。OCR 考试中，可通过监测气体体积、质量损失、颜色变化或 pH 来测量。
- Collision theory: for a reaction to occur, particles must collide with the correct orientation and have energy greater than or equal to the activation energy.
- 碰撞理论：要发生反应，粒子必须以正确取向碰撞，并且能量必须大于或等于活化能。
- Activation energy Eₐ: minimum energy required for a collision to result in a reaction.
- 活化能 Eₐ：产生有效碰撞所需的最低能量。
- Catalyst: a substance that increases the rate of reaction without being chemically changed itself, by providing an alternative route with a lower activation energy.
- 催化剂：通过提供低活化能的替代路径来加快反应速率，自身化学性质不变的物质。
- Maxwell–Boltzmann distribution eact. Increasing temperature shifts the curve to the right and flattens it, increasing the proportion of particles exceeding Eₐ.
- 麦克斯韦‑玻尔兹曼分布：展示气体粒子动能分布的图。只有能量 ≥ Eₐ 的粒子才能反应。升高温度使曲线右移并变平，超过 Eₐ 的粒子比例增加。
6. Chemical Equilibrium | 化学平衡
Dynamic equilibrium – a reversible reaction where the forward and backward rates are equal and the macroscopic properties remain constant. ‘Dynamic’ means the reactions are still happening at the particle level.
动态平衡 – 可逆反应中正逆反应速率相等，宏观性质保持恒定的状态。‘动态’意味着粒子层面反应仍在进行。
- Le Chatelier’s principle: if a system at equilibrium is subjected to a change in concentration, temperature or pressure, the equilibrium position shifts to oppose the change.
- 勒夏特列原理：若平衡体系受到浓度、温度或压强的改变，平衡将向着减弱该改变的方向移动。
- Homogeneous equilibrium: all reactants and products are in the same phase (e.g. all gases).
- 均相平衡：所有反应物和产物处于同一相态（如均为气体）。
- Equilibrium constant Kc: for a reaction aA + bB ⇌ cC + dD, Kc = [C]ᶜ tions are equilibrium concentrations in mol dm⁻³. The value only changes with temperature.
- 平衡常数 Kc：对于反应 aA + bB ⇌ cC + dD，Kc = [C]ᶜ[D]ᵈ / [A]ᵃ[B]ᵇ，各浓度均为平衡浓度（mol dm⁻³）。Kc 的值仅随温度变化。
7. Acids, Bases and pH | 酸、碱与 pH
Brønsted–Lowry acid – a proton (H⁺) donor. Brønsted–Lowry base – a proton acceptor. Visualise acid as ‘giving away H⁺’, base as ‘grabbing H⁺’.
布朗斯特‑劳里酸 – 质子（H⁺）给予体。布朗斯特‑劳里碱 – 质子接受体。联想：酸‘送出’H⁺，碱‘抓住’H⁺。
- Conjugate acid–base pairs: two species that differ by H⁺. HCl/Cl⁻, NH₄⁺/NH₃ are typical examples.
- 共轭酸碱对：仅相差一个 H⁺ 的两种物质，如 HCl/Cl⁻、NH₄⁺/NH₃。
- pH: pH = –log₁₀[H⁺], where [H⁺] is the hydrogen ion concentration in mol dm⁻³.
- pH：pH = –log₁₀[H⁺]，[H⁺] 为氢离子浓度（mol dm⁻³）。
- Strong acid: fully dissociates in water, e.g. HCl, HNO₃, H₂SO₄.
- 强酸：在水中完全解离，如 HCl、HNO₃、H₂SO₄。
- Weak acid anoic acid CH₃COOH. The dissociation constant Kₐ = [H⁺][A⁻]/[HA] quantifies acid strength.
- 弱酸：在水中部分解离，如乙酸 CH₃COOH。酸解离常数 Kₐ = [H⁺][A⁻]/[HA] 可定量衡量酸强度。
- Titration: technique to determine the concentration of an unknown solution by reacting it with a standard solution. Equivalence point is where the amount of titrant added equals the amount of analyte.
- 滴定：通过标准溶液与未知溶液反应来测定其浓度的技术。等当点指加入的滴定剂的量与待测物的量恰好相等。
8. Redox and Oxidation Number | 氧化还原与氧化数
Redox – a reaction where both reduction and oxidation occur simultaneously. Recall ‘OIL RIG’: Oxidation Is Loss (of electrons), Reduction Is Gain (of electrons).
氧化还原 – 氧化与还原同时发生的反应。记住口诀‘OIL RIG’：氧化失电子 (Oxidation Is Loss)，还原得电子 (Reduction Is Gain)。
- Oxidation number: a formal charge assigned to an atom assuming certain bonding rules. The sum of oxidation numbers in a neutral compound is zero; in an ion it equals the ion charge.
- 氧化数：根据一定的成键规则分配给原子的形式电荷。中性化合物中各氧化数总和为零；离子中等于离子电荷。
- Rules to remember: Uncombined element = 0; Group 1 metals = +1; Group 2 = +2; Fluorine = –1; Oxygen usually –2 (except in peroxides, –1, and with F, +2); Hydrogen usually +1 (except in metal hydrides, –1).
- 记忆规则：单质为 0；第 1 族金属 +1；第 2 族 +2；氟总是 –1；氧通常 –2（过氧化物中 –1，与氟结合时 +2）；氢通常 +1（金属氢化物中 –1）。
- Oxidising agent: a species that causes another to be oxidised; itself is reduced. Reducing agent: causes another to be reduced; itself is oxidised.
- 氧化剂：使另一物质氧化，自身被还原。还原剂：使另一物质还原，自身被氧化。
- Disproportionation: a redox reaction where an element in a single species is simultaneously oxidised and reduced.
- 歧化反应：同一物质中某元素同时发生氧化和还原的氧化还原反应。
9. Introduction to Organic Chemistry | 有机化学入门
Homologous series – a family of organic compounds with the same functional group and general formula, each successive member differing by CH₂. The pattern in physical properties makes them easy to predict.
同系物 – 具有相同官能团和通式、相邻成员相差一个 CH₂ 的一系列有机化合物。其物理性质的递变规律使预测变得简单。
- Functional group r : the atom or group of atoms responsible for the characteristic chemical reactions of a compound. E.g. –OH in alcohols, C=C in alkenes.
- 官能团：决定化合物特征化学反应的原子或原子团，如醇的 –OH，烯烃的 C=C。
- Structural isomers: compounds with the same molecular formula but different structural arrangements (chain, position, functional group isomers).
- 结构异构体：分子式相同但结构排列不同的化合物（碳链异构、位置异构、官能团异构）。
- Stereoisomers: same structural formula but different spatial arrangement of atoms. E–Z isomers occur around a C=C double bond due to restricted rotation.
- 立体异构体：结构式相同但原子空间排列不同。因 C=C 双键旋转受阻而产生 E–Z 异构。
- Nomenclature (IUPAC): systematic naming rules — identify the longest carbon chain, number to give the functional group the lowest locant, name substituents alphabetically. The stem ‘meth‑, eth‑, prop‑, but‑’ is worth memorising early.
- 系统命名法 (IUPAC)：确定最长碳链，编号使官能团位次最低，取代基按字母顺序排列。尽早记住词干‘甲‑ (meth‑)、乙‑ (eth‑)、丙‑ (prop‑)、丁‑ (but‑)’会很有帮助。
- Free‑radical substitution: a mechanism involving initiation (UV light breaks halogen bond), propagation (radicals react generating more radicals), and termination (radicals combine). Key for alkanes + halogens.
- 自由基取代：包含引发（紫外光断裂卤素键）、增长（自由基反应产生更多自由基）和终止（自由基结合）的机理。是烷烃与卤素反应的关键。
10. Analytical Techniques: IR and Mass Spectrometry | 分析技术：红外与质谱
Infrared (IR) spectroscopy – molecules absorb infrared radiation to make bonds vibrate (stretch or bend). Each functional group absorbs at characteristic wavenumber ranges, producing an IR spectrum used for identification.
红外光谱 (IR) – 分子吸收红外辐射引起键的振动（伸缩或弯曲）。各官能团在特征波数范围吸收，产生的红外谱图可用于鉴定。
- Key absorptions for OCR: O–H (alcohols) broad 3200–3550 cm⁻¹; C=O (carbonyl) strong 1640–1750 cm⁻¹; C–O 1000–1300 cm⁻¹. The fingerprint region (below 1500 cm⁻¹) is unique to each molecule.
- OCR 需记住的关键吸收：O–H (醇) 宽峰 3200–3550 cm⁻¹；C=O (羰基) 强峰 1640–1750 cm⁻¹；C–O 1000–1300 cm⁻¹。指纹区 (<1500 cm⁻¹) 对每个分子都独一无二。
- Mass spectrometry: technique to determine relative atomic/molecular mass by ionising a sample and separating ions according to their mass‑to‑charge ratio (m/z). The molecular ion peak M⁺ gives the Mᵣ.
- 质谱：通过离子化样品并按质荷比 (m/z) 分离离子来测定相对原子/分子质量的技术。分子离子峰 M⁺ 给出 Mᵣ。
- Fragmentation: when the molecular ion breaks into smaller ions, producing characteristic peaks that help deduce the structure.
- 碎裂：分子离子断裂成更小离子，产生特征碎片峰，有助于推断结构。
11. Clever Memory Techniques for Chemistry Terms | 化学术语的巧妙记忆方法
Building a strong vocabulary is about making connections, not rote memorisation. Try these proven approaches to lock in the terms.
建立丰富的术语储备靠的是建立联系，而不是死记硬背。试试下面这些经过验证的方法，把词汇牢牢锁在脑中。
- Word‑root dissection: Break Greek/Latin roots into clues. ‘Electro‑’ (amber, electricity) + ‘lysis’ (splitting) = electrolysis (splitting with electricity). ‘Thermo‑’ (heat) + ‘dynamic’ (power) = thermodynamics. ‘Photo‑’ (light) + ‘ ting together) = photosynthesis. Every time you meet a new term, look for familiar pieces.
- 词根拆解法：把希腊语/拉丁语词根拆成线索。‘Electro‑’ (电) + ‘lysis’ (分解) = 电解。‘Thermo‑’ (热) + ‘dynamic’ (动力) = 热力学。‘Photo‑’ (光) + ‘synthesis’ (组合) = 光合作用。每遇到一个新术语，寻找你熟悉的模块。
- Story‑linking: Turn abstract terms into a micro‑story. For example, the ‘ ity named Avogadro, where everyone is a particle. 6.02×10²³ citizens make a mole of stuff.
- 故事联想：把抽象术语编成微型故事。例如，‘阿伏伽德罗常数’就像一个名为阿伏伽德罗的超大城市的人口，每个居民代表一个粒子，6.02×10²³ 个市民就是一摩尔物质。
- Acronym / phrase hacks: ‘OIL RIG’ for redox; ‘CATions are PAWsitive’; ‘ANions are A Negative iON’—the ‘N’ in anion stands for negative.
- 首字母/谐音记忆：‘OIL RIG’ 记氧化还原；‘CATions are PAWsitive’ (阳离子 paw 爪子，正电)；‘ANion = A Negative ion’ (阴离子带负电)。
- Visual pattern cards: On a flashcard, write the English term on one side and the Chinese on the other. Sketch the concept (e.g., a lock‑and‑key for enzyme catalysis) or draw the graph (Maxwell–Boltzmann curve). The dual coding strengthens memory.
- 视觉模式卡片：在闪卡一面写英文术语，另一面写中文。画出概念图（如锁钥模型）或图表（麦克斯韦‑玻尔兹曼曲线）。双重编码增强记忆。
- Contextual embedding: Don’t just memorise a definition; use the term in a full sentence that links it to an experimental observation. “We measured the ΔfH⊖ of ethanol by recording the temperature rise of water in a spirit burner experiment.”
- 语境嵌入：不要只背定义，要把术语用在联系实验观察的完整句子中。“我们通过酒精灯实验记录水温升高的方式来测量乙醇的 ΔfH⊖。”
12. Putting It into Practice | 实战检验
Consistent, active recall is the key to making these terms second nature. The following routine will transform your understanding into exam performance.
持续主动提取是让这些术语变成第二本能的关键。下面的常规步骤将把你的理解转化为考场表现。
- Daily micro‑review: Pick 5 terms and explain them in your own words bilingually in under two minutes.
- 每日微复习：选 5 个术语，在 2 分钟内用自己的话双语解释。
- Weekly grouping: Organise terms by topic (energetics, bonding, organic) and draw concept maps linking them.
- 每周归类：按主题（能量、键合、有机）组织术语，绘制连接它们的概念图。
- Past‑paper lexicon: While doing OCR Paper 1 and 2 questions, highlight every technical word; if you stumble, return to this guide for reinforcement.
- 真题术语表：做 OCR 试卷 1 和 2 时，划出每一个技术词汇；遇到障碍就回到这份指南强化记忆。
| Term | 记忆线索 |
|---|---|
| Isotope | iso‑ (同) + tope (位置) → 同一位子 |
| Electrophile | electron‑loving (亲电) |
| Nucleophile | nucleus‑loving (亲核) |
| Exothermic | exit (离开) → 热量离开体系 |
| Endothermic | enter (进入) → 热量进入体系 |
By weaving these memory tricks into your study routine, you will rapidly move from recognising terms to using them accurately in long‑answer questions and practical evaluations. Bookmark this page and revisit it each week; the vocabulary will soon feel instinctive.
把这些记忆技巧融入日常学习，你就会迅速从认识术语过渡到在长答题和实验评价中准确运用它们。收藏本页，每周回看；这些词汇很快就会成为你的本能反应。
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