📚 Year 10 CIE Chemistry: Key Vocabulary Memorisation Guide | Year 10 CIE 化学：词汇术语速记指南
Mastering chemistry starts with a solid grip on its vocabulary. This guide breaks down essential Year 10 CIE terms into clear definitions, smart memory hooks, and bilingual explanations to help you learn faster and recall accurately in exams.
学好化学，首先要攻克词汇关。这份指南将 Year 10 CIE 化学的核心术语拆解为清晰定义、巧妙的记忆技巧以及中英双语解释，帮你学得更快、考场上回忆更准。
1. Atoms and Elements | 原子与元素
Atom: The smallest particle of an element that can exist and take part in a chemical reaction. It contains a central nucleus (protons and neutrons) surrounded by electrons in shells.
原子：元素能够存在并参与化学反应的最小粒子。它包含中心的原子核（质子和中子）以及核外分层排布的电子。
Element: A pure substance made of only one type of atom. It cannot be broken down into simpler substances by chemical means.
元素：仅由一种原子组成的纯净物，不能通过化学方法分解为更简单的物质。
Proton: A positively charged subatomic particle found in the nucleus, with a relative mass of 1. Memory tip: Proton = Positive – both start with 'P'.
质子：位于原子核内带正电的亚原子粒子，相对质量约为 1。记忆法：质子带正电（Positive），都以 P 开头。
Neutron: A neutral particle in the nucleus with a relative mass of 1. Neutron = Neutral shares the 'N' sound.
中子：原子核内不带电的粒子，相对质量约为 1。联想：中子 Neutral，都以 N 开头。
Electron: A negatively charged particle that moves around the nucleus in energy levels. Its mass is 1/1836 of a proton, often considered negligible.
电子：带负电的粒子，在核外分层运动。质量约为质子的 1/1836，通常忽略不计。
Atomic number (Z): The number of protons in the nucleus, which determines the element's identity. In a neutral atom, it also equals the number of electrons.
原子序数 (Z)：原子核中质子的数目，决定了元素的种类。中性原子中，原子序数也等于电子数。
Mass number (A): The total number of protons and neutrons in the nucleus. Number of neutrons = A - Z.
质量数 (A)：原子核中质子数与中子数之和。中子数 = A - Z。
Quick memory for elements' symbols: many come from Latin names, e.g., Sodium is Na (Natrium), Potassium is K (Kalium), Iron is Fe (Ferrum). Link the symbol to the Latin root.
元素符号速记：很多符号来源于拉丁名，如钠 Na (Natrium)，钾 K (Kalium)，铁 Fe (Ferrum)。把符号和拉丁词根联系起来。
2. Ions and Isotopes | 离子与同位素
Ion: A charged particle formed when an atom gains or loses electrons. A cation is a positive ion (metals lose electrons), while an anion is a negative ion (non-metals gain electrons).
离子：原子得失电子后形成的带电粒子。阳离子是正离子（金属失电子），阴离子是负离子（非金属得电子）。
Memory aid for cation vs. anion: 'Cation' has a 't' which looks like a plus +, so it's positive. Or use 'CATions are PAWsitive' and 'ANion: A Negative ion'.
区分阳离子与阴离子的记忆法：Cation 包含字母 t，形似加号 +，所以是正的。或者记：CATions 是 "PAWsitive"（猫爪是正的），ANion 则是 A Negative ion（一个负离子）。
Isotope: Atoms of the same element with the same number of protons but different numbers of neutrons. They have identical chemical properties but slightly different physical properties.
同位素：同种元素的原子，质子数相同但中子数不同。它们化学性质几乎相同，物理性质略有差异。
Think of isotopes as 'same-same but different': same protons, different neutrons. For example, carbon-12, carbon-13 and carbon-14 all have 6 protons but 6, 7 and 8 neutrons.
把同位素想成“同门而不同量”：质子数相同，中子数不同。例如碳-12、碳-13 和碳-14，质子数都是 6，但中子数分别为 6、7 和 8。
Relative atomic mass (Aᵣ): The weighted average mass of the isotopes of an element compared to 1/12th the mass of a carbon-12 atom. It accounts for isotope abundance.
相对原子质量 (Aᵣ)：元素各同位素按丰度加权平均后的质量，与碳-12 原子质量的 1/12 相比所得数值。
3. Chemical Bonds: Ionic, Covalent and Metallic | 化学键：离子键、共价键与金属键
Ionic bond: The strong electrostatic attraction between oppositely charged ions. It forms when a metal transfers one or more electrons to a non-metal. The resulting giant ionic lattice has high melting points and conducts electricity when molten or dissolved.
离子键：带相反电荷离子之间的强静电吸引力。金属将电子转移给非金属时形成离子键。形成的巨型离子晶格熔点高，熔融或溶于水时可导电。
Memory: Ionic = 'I give and take' electrons. Compounds are often crystalline at room temperature.
记忆：Ionic 读着像 "I onic"，联想 "I give and take"（我给予拿走电子）。
Covalent bond: A bond formed when two non-metal atoms share one or more pairs of electrons. Simple molecular substances like H₂O and CO₂ have low melting points, while giant covalent structures like diamond and SiO₂ are very hard and have high melting points.
共价键：两个非金属原子通过共用一对或多对电子形成的化学键。简单分子如 H₂O、CO₂ 熔点低，但巨型共价结构如金刚石和 SiO₂ 硬度大、熔点极高。
Remember: 'Co' means together, 'valent' relates to valence electrons. So co-valent = sharing valence electrons.
记忆：Co- 表示共同，valent 与价电子有关，共价键就是共同分享价电子。
Metallic bond: The attraction between positive metal ions and the 'sea' of delocalised electrons surrounding them. This gives metals their malleability, ductility and ability to conduct heat and electricity.
金属键：金属阳离子与周围“电子海”之间的吸引力。这赋予金属延展性、可塑性以及导电导热的能力。
Picture a lattice of metal cations floating in a sea of moving electrons – like a tightly packed fruit in jelly that can slide when force is applied.
想象金属阳离子排列成的晶格漂浮在电子的海洋中——就像紧实的水果在果冻中，可以相对滑动，所以金属有延展性。
4. Formulae and Equations | 化学式与方程式
Molecular formula: Shows the actual number of atoms of each element in one molecule of a compound, e.g., C₂H₆.
分子式：表示一个分子中每种原子的实际数目，如 C₂H₆。
Empirical formula: The simplest whole-number ratio of atoms in a compound, e.g., CH₃ for ethane.
经验式（最简式）：化合物中各原子最简整数比，例如乙烷的经验式为 CH₃。
Displayed formula: Shows all atoms and bonds in a molecule using lines for covalent bonds.
结构式（展示式）：用短线表示共价键，画出分子中所有原子和键的连接方式。
Balancing equations w of conservation of mass. Use coefficients in front of formulae, never change subscripts.
配平方程式：箭头 → 两边每种元素的原子数目必须相等，遵循质量守恒定律。只能改变前面的系数，切不可改动下标。
State symbols: (s) solid, (l) liquid, (g) gas, (aq) aqueous (dissolved in water). A humorous memory: 'Silly Little Goats Are Quiet' – Solids, Liquids, Gases, Aqueous.
状态符号：(s) 固体，(l) 液体，(g) 气体，(aq) 水溶液。趣味记忆："傻小羊们都安静"——Silly Little Goats Are Quiet 对应 s, l, g, aq。
Relative formula mass (Mᵣ): The sum of the relative atomic masses of all atoms in the formula. Used for ionic compounds.
相对式量 (Mᵣ)：化学式中所有原子的相对原子质量之和，常用于离子化合物。
5. Acids, Bases and Salts | 酸、碱与盐
Acid: A substance that donates hydrogen ions (H⁺) in aqueous solution. Common acids: HCl (hydrochloric acid), H₂SO₄ (sulfuric acid), HNO₃ (nitric acid). Acids have pH less than 7 and turn blue litmus red.
酸：在水溶液中提供氢离子 (H⁺) 的物质。常见酸：HCl（盐酸）、H₂SO₄（硫酸）、HNO₃（硝酸）。酸的 pH 小于 7，使蓝色石蕊试纸变红。
Base: A substance that can neutralise an acid, often by accepting H⁺ or releasing OH⁻. Alkalis are soluble bases that produce hydroxide ions (OH⁻) in water, e.g., NaOH, KOH.
碱：能中和酸的物质，通常通过接受 H⁺ 或释放 OH⁻ 起作用。可溶性碱称为 alkali，在水中产生氢氧根离子 OH⁻，如 NaOH、KOH。
the metal (from the base) and the acid: hydrochloric acid forms chlorides, sulfuric acid forms sulfates, nitric acid forms nitrates.
中和反应：酸 + 碱 → 盐 + 水。例如 HCl + NaOH → NaCl + H₂O。盐的命名取决于碱中的金属和酸的种类：盐酸生成氯化物，硫酸生成硫酸盐，硝酸生成硝酸盐。
pH scale: A measure of the acidity or alkalinity of a solution, ranging from 0 (very acidic) to 14 (very alkaline), with 7 being neutral. It is related to the concentration of H⁺ ions.
pH 标度：衡量溶液酸碱性强弱的尺度，范围从 0（强酸性）到 14（强碱性），7 为中性。它与 H⁺ 离子浓度相关。
Memory for acid-base indicators: Litmus is 'red in acid, blue in base'. Methyl orange turns red in acid, yellow in alkali. Phenolphthalein is colourless in acid, pink in alkali.
指示剂记忆：石蕊“酸红碱蓝”，甲基橙“酸红碱黄”，酚酞“酸无色碱粉红”。
6. Redox Reactions | 氧化还原反应
Oxidation: Originally defined as the gain of oxygen or loss of hydrogen. In terms of electrons, oxidation is the loss of electrons. A substance that is oxidised increases its oxidation number.
氧化：最初定义为得氧或失氢。从电子转移角度看，氧化是失去电子。被氧化的物质氧化数升高。
Reduction: The loss of oxygen or gain of hydrogen; more fundamentally, reduction is the gain of electrons. Oxidation number decreases.
还原：失氧或得氢；更本质地说，还原是得到电子。氧化数降低。
The classic memory device: OIL RIG – Oxidation Is Loss (of electrons), Reduction Is Gain (of electrons). Another is LEO says GER: Loss of Electrons is Oxidation, Gain of Electrons is Reduction.
经典记忆法：OIL RIG – Oxidation Is Loss (of electrons)，还原是得电子。或者 LEO 说 GER: Lose Electrons Oxidation, Gain Electrons Reduction。
Oxidising agent: A substance that oxidises another by accepting electrons; it is itself reduced. Reducing agent: A substance that reduces another by donating electrons; it is itself oxidised.
氧化剂：通过接受电子使另一物质氧化的物质，自身被还原。还原剂：通过提供电子使另一物质还原的物质，自身被氧化。
Redox reaction ement of copper by zinc: Zn + Cu²⁺ → Zn²⁺ + Cu, zinc is oxidised, copper ions are reduced.
氧化还原反应：氧化与还原同时发生的反应。如锌置换铜：Zn + Cu²⁺ → Zn²⁺ + Cu，锌被氧化，铜离子被还原。
7. Electrolysis | 电解
Electrolysis: The decomposition of an ionic compound by passing an electric current through its molten or aqueous form. It involves a cathode (negative electrode) and an anode (positive electrode).
电解：通过向熔融或水溶液态的离子化合物中通入电流，使其分解的过程。需要使用阴极（负极）和阳极（正极）。
Electrolyte: The ionic substance that conducts electricity and is decomposed during electrolysis. In molten NaCl, the ions are free to move.
电解质：能够导电并在电解过程中被分解的离子化合物。在熔融 NaCl 中，离子可自由移动。
Electrode reactions: At the cathode, cations gain electrons (reduction). At the anode, anions lose electrons (oxidation). Remember: Cations to Cathode, Anions to Anode due to opposite charges. Also use AnOx RedCat: Anode - Oxidation, Reduction - Cathode.
电极反应：阴极上阳离子得电子（还原），阳极上阴离子失电子（氧化）。记忆：Cations go to Cathode, Anions go to Anode（异性相吸）。也可以用口诀 AnOx RedCat：阳极氧化，阴极还原。
In aqueous solutions, water can also be discharged. The reactivity series helps predict products: if the metal is more reactive than hydrogen, H⁺ is discharged at the cathode rather than the metal ion. At the anode, halide ions (if present) are oxidised before OH⁻, otherwise oxygen gas from OH⁻ is produced.
在水溶液中，水也可能参与放电。活动性顺序有助于预测产物：如果金属比氢活泼，则阴极上 H⁺ 放电而非金属离子。阳极上，若有卤离子则优先于 OH⁻ 放电，否则 OH⁻ 放电产生氧气。
8. Rates of Reaction and Energetics | 反应速率与能量变化
Rate of reaction: The speed at which reactants are converted into products. It can be measured by the change in mass, volume of gas produced, or colour change over time.
反应速率：反应物转化为产物的快慢。可通过测量质量变化、气体体积变化或颜色变化随时间的关系来确定。
Collision theory: For a reaction to occur, particles must collide with sufficient energy (activation energy) and correct orientation. The rate depends on the frequency of successful collisions.
碰撞理论：要发生反应，粒子必须发生碰撞，并且具有足够的能量（活化能）和正确的取向。速率取决于有效碰撞的频率。
Activation energy (Eₐ): The minimum energy that colliding particles need for a reaction to happen. A catalyst provides an alternative pathway with a lower activation energy.
活化能 (Eₐ)：碰撞粒子发生反应所需的最低能量。催化剂能提供一条活化能较低的替代反应路径。
Factors that increase rate: increasing temperature (particles move faster, more energetic collisions), increasing concentration/pressure (more particles per unit volume), increasing surface area (more exposed solid particles), and adding a catalyst. Link each factor to collision frequency and success.
加快反应速率的因素：升高温度（粒子运动更快，高能碰撞增多）、增大浓度/压强（单位体积粒子数增加）、增大固体表面积（暴露更多粒子）、加入催化剂。每种因素都与碰撞频率和有效碰撞联系起来记忆。
Exothermic reaction: A reaction that releases energy to the surroundings, usually as heat, causing a temperature rise. Example: combustion, neutralisation. Energy profile shows products lower in energy than reactants.
放热反应：向环境释放能量（通常为热）的反应，温度升高。如燃烧、中和反应。能量图显示产物能量低于反应物。
Endothermic reaction: A reaction that absorbs energy from the surroundings, causing a temperature drop. Example: thermal decomposition, photosynthesis.
吸热反应：从环境吸收能量的反应，温度下降。如热分解、光合作用。
Think of 'exo' as 'exit' – heat exits the system. 'Endo' as 'enter' – heat enters the system.
记忆：exo- 想象成 exit，热量离开体系；endo- 想象成 enter，热量进入体系。
9. Organic Chemistry Basics | 有机化学基础
Organic chemistry: The study of carbon-containing compounds, excluding carbonates, oxides and cyanides. Hydrocarbons contain only carbon and hydrogen.
有机化学：研究含碳化合物的学科，但不包括碳酸盐、氧化物和氰化物。碳氢化合物仅含碳和氢两种元素。
Homologous series: A family of organic compounds with the same general formula, similar chemical properties, and a gradual change in physical properties (e.g., alkanes, alkenes). Each successive member differs by one CH₂ unit.
同系物：同一系列有机化合物，具有相同的通式、相似的化学性质，物理性质随碳数增加呈规律性变化（如烷烃、烯烃）。每相邻两个成员相差一个 CH₂。
Alkane: Saturated hydrocarbons with single bonds only and general formula CₙH₂ₙ₊₂. Names end in '-ane', e.g., methane CH₄, ethane C₂H₆. They undergo combustion and substitution reactions.
烷烃：饱和烃，只含单键，通式为 CₙH₂ₙ₊₂。名称以 "-ane" 结尾，如甲烷 CH₄，乙烷 C₂H₆。可发生燃烧和取代反应。
Alkene : Unsaturated hydrocarbons containing at least one C=C double bond, general formula CₙH₂ₙ. Names end in '-ene', e.g., ethene C₂H₄. They undergo addition reactions and decolourise bromine water – a test for unsaturation.
烯烃：不饱和烃，至少含有一个 C=C 双键，通式为 CₙH₂ₙ。名称以 "-ene" 结尾，如乙烯 C₂H₄。可发生加成反应，能使溴水褪色——这是检验不饱和键的方法。
Remember the first four prefixes: meth- (1 carbon), eth- (2), prop- (3), but- (4). Many Monkeys Eat Peeled Bananas can help: Meth, Eth, Prop, But.
记忆前四个碳数的前缀：meth-（1碳），eth-（2碳），prop-（3碳），but-（4碳）。可以用 "Mickey Eats Peanut Butter" （米奇吃花生酱）来记 Meth, Eth, Prop, But。
Functional group: An atom or group of atoms responsible for the characteristic reactions of a compound, e.g., -OH for alcohols, -COOH for carboxylic acids.
官能团：决定一类化合物特征反应的原子或原子团，如醇的 -OH，羧酸的 -COOH。
10. Laboratory Terms and Safety | 实验室术语与安全
Beaker: A cylindrical container with a lip for pouring, used for mixing, heating, or holding liquids. Not intended for accurate volume measurement.
烧杯：带倾倒嘴的圆柱形容器，用于混合、加热或盛装液体，不适合精确量取体积。
Conical flask (Erlenmeyer flask): A flask with a flat bottom, conical body, and narrow neck, ideal for swirling and titrations because it reduces splashing.
锥形瓶（三角烧瓶）：平底、锥体、窄颈的瓶子，因摇晃时液体不易溅出，非常适合滴定操作。
Measuring cylinder: A tall, narrow container with a scale, used to measure approximate volumes of liquids. Read at the bottom of the meniscus at eye level.
量筒：带有刻度的细高容器，用来粗略量取液体体积。读数时应将视线与凹液面最低处保持水平。
Pipette and burette: A pipette delivers a fixed volume accurately (e.g., 25.0 cm³). A burette is a long graduated tube with a tap, used to add variable volumes accurately in titrations. Burette readings are taken to 0.05 cm³.
移液管与滴定管：移液管可精确移取固定体积（如 25.0 cm³）。滴定管是带旋塞的细长刻度管，用于滴定中准确加入不同体积的溶液，读数可精确到 0.05 cm³。
Bunsen burner & heating: The 'safety flame' is a luminous yellow flame used when not directly heating; the 'roaring blue flame' is non-luminous and hotter, used for heating. The air hole controls air supply.
本生灯与加热："安全焰"是黄色发光火焰，不加热时使用；"蓝焰"为无光高温火焰，用来加热。进气孔调节空气量。
Hazard symbols: Recognise flammable,
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