📚 Year 9 AQA Chemistry: Vocabulary and Terminology Quick-Reference Guide | AQA 九年级化学词汇术语速记指南
Mastering the specific vocabulary of chemistry is just as important as understanding the concepts themselves. In Year 9 AQA Chemistry, you will encounter a range of key terms that form the foundation for future study. This guide breaks down essential terminology into themed sections, pairing definitions with simple explanations and memory aids to help you recall them quickly and accurately. Whether you are preparing for an end-of-topic test or building long-term knowledge, these quick-reference notes will support your revision journey.
掌握化学的专业词汇与理解概念本身同样重要。在 AQA 九年级化学课程中，你会碰到一系列构成未来学习基础的关键术语。本指南将核心词汇按主题分节，逐条配以简洁解释与记忆辅助，帮助你快速准确地记下这些术语。不论你是在准备单元测验还是夯实长期知识，这份速记参考都将为你的复习之旅提供支撑。
1. Matter Classification | 物质分类
Atom: The smallest particle of an element that can exist and still show the chemical properties of that element.
原子：能够独立存在并仍然表现出某种元素化学性质的最小粒子。
Element: A substance made up of only one type of atom. Elements cannot be broken down into simpler substances by chemical reactions.
元素：仅由一种原子构成的物质。元素不能通过化学反应分解成更简单的物质。
Compound: A substance formed when two or more different elements are chemically bonded together in fixed proportions. The properties of a compound are usually very different from the elements that form it.
化合物：由两种或以上不同元素以固定比例通过化学键结合而成的物质。化合物的性质通常与构成它的单质极为不同。
Mixture: A combination of two or more substances that are not chemically joined. The components can be separated by physical means, and each part keeps its own properties.
混合物：两种或以上物质混合但并未发生化学结合。各组分可通过物理方法分离，且各自保持原有的性质。
Molecule: A group of two or more atoms chemically bonded together. Molecules can be elements (e.g. O₂) or compounds (e.g. H₂O).
分子：由两个或以上原子通过化学键结合而成的微粒团。分子可以是单质（如 O₂），也可以是化合物（如 H₂O）。
Element → Atom type; Compound → different atoms bonded; Mixture → not bonded.
元素 → 一种原子；化合物 → 不同原子键合；混合物 → 未键合。
2. The Particle Model | 粒子模型
Particle model: A scientific description that explains the behaviour of solids, liquids and gases by picturing matter as tiny, moving particles. It helps us understand changes of state and diffusion.
粒子模型：一种将物质想象为由极小的运动粒子组成的科学描述，用以解释固体、液体和气体的行为，并帮助我们理解物态变化和扩散。
Solid: State of matter where particles are packed closely in a regular arrangement, vibrate in fixed positions, and have a definite shape and volume.
固体：粒子紧密堆积、排列规则，只能在固定位置振动，具有确定的形状和体积的物态。
Liquid: State of matter where particles are close together but can slide past each other, so a liquid takes the shape of the bottom of its container and has a fixed volume.
液体：粒子彼此靠近但能相互滑动，因此液体随容器底部形状变化，并保持固定体积的物态。
Gas: State of matter where particles are far apart, move rapidly in all directions, and are easily compressed. Gases have no fixed shape or volume.
气体：粒子相距很远、快速向各个方向运动的物态，容易被压缩，没有固定的形状和体积。
Diffusion: The net movement of particles from an area of higher concentration to an area of lower concentration, due to the random motion of particles.
扩散：由于粒子的无规则运动，粒子从高浓度区域向低浓度区域净移动的过程。
Pressure in gases: Caused by gas particles colliding with the walls of their container. Increasing temperature makes particles move faster, raising pressure if volume is fixed.
气体压强：由气体粒子撞击容器壁引起。温度升高使粒子运动加快，若体积固定则压强增大。
3. Chemical Reactions: Reactants, Products and Equations | 化学反应：反应物、生成物与方程式
Chemical reaction: A process where one or more substances (reactants) are transformed into one or more new substances (products) with different chemical properties.
化学反应：一种或多种物质（反应物）转变成一种或多种具有不同化学性质的新物质（生成物）的过程。
Reactant: A starting substance that undergoes change in a chemical reaction. Written on the left-hand side of a word or symbol equation.
反应物：在化学反应中发生变化的起始物质，书写在文字表达式或符号方程式的左侧。
Product: A new substance formed during a chemical reaction. Written on the right-hand side of an equation.
生成物：化学反应过程中形成的新物质，书写在方程式的右侧。
Word equation show a chemical reaction using the names of reactants and products, with an arrow meaning 'react to form'. For example: magnesium + oxygen → magnesium oxide.
文字表达式：使用物质名称表示化学反应的一种简单方式，箭头表示“反应生成”。例如：镁 + 氧气 → 氧化镁。
Symbol equation ymbols of the elements and the ratios of particles involved. For example: 2Mg + O₂ → 2MgO.
符号方程式：用化学式表示化学反应的一种方式，它表明了元素符号和各粒子的数量比。例如：2Mg + O₂ → 2MgO。
Conservation of mass: The principle that in a chemical reaction, the total mass of reactants equals the total mass of products. Atoms are rearranged, not created or destroyed.
质量守恒：化学反应中，反应物的总质量等于生成物的总质量的原理。原子只是重新排列，既不会凭空产生也不会凭空消失。
mass of reactants = mass of products
反应物总质量 = 生成物总质量
4. The Periodic Table | 周期表概览
Periodic table: A tabular arrangement of all known elements, ordered by increasing atomic number. Elements with similar chemical properties are placed in the same vertical column, called a group.
周期表：按原子序数递增排列所有已知元素的表格。化学性质相似的元素被放在同一竖列，称为族。
Group: A vertical column in the periodic table. Elements in the same group have the same number of outer-shell electrons, which gives them similar reactions. For example, Group 1 contains the very reactive alkali metals.
族：周期表中一个竖列。同一族的元素最外层电子数相同，因此化学反应相似。例如第1族含有非常活泼的碱金属。
Period: A horizontal row in the periodic table. As you move across a period, the number of outer electrons increases and properties change gradually from metallic to non-metallic.
周期：周期表中的一个横行。从左到右，最外层电子数递增，性质从金属性逐渐过渡到非金属性。
Metal: An element that typically is shiny, conducts heat and electricity well, is malleable (can be hammered into shape) and ductile (can be drawn into wires).
金属：通常具有光泽、导热导电性好、有延展性（可捶成薄片）和韧性（可拉成丝）的元素。
Non-metal: An element that is generally dull, poor conductor of heat and electricity, and brittle when solid. Many are gases at room temperature.
非金属：通常暗淡无光、导热导电性差、固态时脆性大的一类元素。很多非金属在室温下是气体。
Noble gases: Elements in Group 0 (or Group 8) that have a full outer electron shell, making them extremely unreactive. Examples include helium, neon and argon.
稀有气体：位于第0族（或第8族）的元素，最外层电子已满，因此极不活泼。例如氦、氖和氩。
Alkali metals: Highly reactive metals in Group 1, such as lithium, sodium and potassium. They react vigorously with water and are stored under oil to prevent reaction with air.
碱金属：第1族中化学性质非常活泼的金属，如锂、钠和钾。它们与水剧烈反应，需保存在油中以隔绝空气。
5. Acids, Alkalis and pH | 酸、碱与 pH
Acid: A substance that produces hydrogen ions (H⁺) when dissolved in water. Acids have a pH lower than 7 and turn blue litmus paper red.
酸：溶于水时产生氢离子（H⁺）的物质。酸的 pH 低于 7，能使蓝色石蕊试纸变红。
Alkali: A soluble base that produces hydroxide ions (OH⁻) when dissolved in water. Alkalis have a pH greater than 7 and turn red litmus paper blue.
碱（可溶性碱）：溶于水时产生氢氧根离子（OH⁻）的可溶性碱。碱溶液的 pH 大于 7，能使红色石蕊试纸变蓝。
Base: A substance that can neutralise an acid to form a salt and water. Metal oxides and metal hydroxides are common bases; those that dissolve in water are called alkalis.
碱（广义）：能与酸中和生成盐和水的物质。金属氧化物和金属氢氧化物是常见的碱；其中能溶于水的称为可溶性碱 (alkali)。
pH scale: A numerical scale from 0 to 14 used to measure how acidic or alkaline a solution is. pH 7 is neutral, values below 7 are acidic, above 7 are alkaline.
pH 尺度：从 0 到 14 的数字尺度，用于衡量溶液的酸碱度。pH 7 为中性，小于 7 为酸性，大于 7 为碱性。
Neutralisation: A chemical reaction between an acid and a base (or alkali) that produces a salt and water. The pH moves towards 7.
中和反应：酸与碱（或可溶性碱）之间生成盐和水的化学反应，pH 会向 7 靠拢。
Indicator: A substance that changes colour depending on whether a solution is acidic, alkaline or neutral. Universal indicator shows a range of colours across the pH scale.
指示剂：在不同酸碱环境下会改变颜色的物质。通用指示剂可在整个 pH 范围内显示出一系列颜色变化。
6. Oxidation and Reduction | 氧化与还原
Oxidation: A chemical reaction in which a substance gains oxygen. For example, when iron reacts with oxygen and water, it rusts; the iron is oxidised.
氧化：物质获得氧的化学反应。例如铁与氧气和水反应生锈，铁被氧化。
Reduction: A chemical reaction in which a substance loses oxygen. This often happens when a metal oxide is heated with carbon; the metal oxide is reduced to the metal.
还原：物质失去氧的化学反应。常发生在用碳加热金属氧化物时，金属氧化物被还原为金属。
Redox reaction: A reaction where both oxidation and reduction occur simultaneously. One substance gains oxygen while another loses oxygen.
氧化还原反应：氧化和还原同时发生的反应。一种物质得氧，同时另一种物质失氧。
Oxidising agent: A substance that gives oxygen to another reactant and is itself reduced in the process.
氧化剂：把氧提供给其他反应物，而自身被还原的物质。
Reducing agent: A substance that removes oxygen from another reactant and is itself oxidised.
还原剂：从其他反应物中夺取氧，而自身被氧化的物质。
OIL RIG: Oxidation Is Loss (of electrons, later); but for Year 9, remember: Oxidation Is Gain of Oxygen, Reduction Is Loss of Oxygen.
氧助记：氧化得氧，还原失氧。
7. Separation Techniques | 分离技术
Filtration: A technique used to separate an insoluble solid from a liquid or solution by passing the mixture through filter paper. The solid remains as the residue while the liquid passes through as filtrate.
过滤：利用滤纸分离不溶性固体与液体（或溶液）的方法。固体留在滤纸上成为残渣，液体通过成为滤液。
Evaporation: A method to separate a dissolved solid from its solvent by heating the solution until the liquid boils away, leaving the solid behind.
蒸发：通过加热溶液使溶剂沸腾汽化，从而将溶解的固体与溶剂分离，固体结晶析出。
Distillation: A process that involves boiling a liquid to form a vapour and then condensing the vapour back to a liquid to collect it. Simple distillation separates a solvent from dissolved solids; fractional distillation separates a mixture of liquids with different boiling points.
蒸馏：将液体煮沸汽化，再将蒸气冷凝回收为液体的过程。简单蒸馏用于分离溶剂与溶解固体；分馏则用于分离沸点不同的液体混合物。
Chromatography: A technique to separate dissolved substances that move through a medium (like paper) at different speeds. It is often used to separate coloured dyes in inks or food colourings.
色谱法：一种利用物质在介质（如滤纸）上移动速度不同来分离溶解物质的技术，常用于分离墨水或食用色素中的染料。
Solvent: The liquid in which a solute dissolves to form a solution. In salt water, water is the solvent.
溶剂：溶解溶质形成溶液的液体。在食盐水中，水是溶剂。
Solute: The substance that dissolves in a solvent. In salt water, sodium chloride is the solute.
溶质：溶解于溶剂中的物质。在食盐水中，氯化钠是溶质。
8. Introduction to Chemical Bonding | 化学键入门
Ion: A charged particle formed when an atom (or group of atoms) gains or loses electrons. A positive ion (cation) forms when electrons are lost; a negative ion (anion) forms when electrons are gained.
离子：原子（或原子团）得到或失去电子后形成的带电粒子。失去电子形成阳离子（正离子），得到电子形成阴离子（负离子）。
Ionic bond: The strong electrostatic attraction between oppositely charged ions. It usually occurs between a metal and a non-metal, where the metal transfers electrons to the non-metal.
离子键：带相反电荷的离子之间的强静电吸引力。通常发生在金属与非金属之间，金属将电子转移给非金属。
Covalent bond: A shared pair of electrons between two non-metal atoms, holding them together. Molecules such as H₂O and CO₂ are held together by covalent bonds.
共价键：两个非金属原子之间共用的一对电子，将原子结合在一起。H₂O 和 CO₂ 等分子就是通过共价键形成的。
Lattice: A regular, repeating three-dimensional arrangement of particles. Ionic compounds form a giant ionic lattice, while metals form a giant metallic lattice.
晶格：粒子在三维空间中有规律重复的排列方式。离子化合物形成巨大的离子晶格，金属则形成巨大的金属晶格。
Empirical formula: The simplest whole number ratio of atoms of each element in a compound. For example, sodium chloride is NaCl (1:1), and water is H₂O (2:1).
经验式（最简式）：化合物中各元素原子的最简整数比。例如氯化钠是 NaCl（1:1），水是 H₂O（2:1）。
9. Signs of a Chemical Reaction and Energy Changes | 化学反应的迹象与能量变化
Precipitate: A solid that forms out of solution during a chemical reaction, often making the mixture cloudy.
沉淀：在化学反应中从溶液中生成的不溶性固体，常使混合物变浑浊。
Effervescence: The rapid escape of bubbles of gas from a liquid, commonly called fizzing. It is a sign that a gas is being produced.
冒泡/起泡：气体泡快速从液体中逸出的现象，常表示有气体生成。
Exothermic reaction: A chemical reaction that transfers thermal energy to the surroundings, causing a temperature rise. Combustion is a classic exothermic process.
放热反应：将热能传递给周围环境的化学反应，导致温度升高。燃烧是典型的放热过程。
Endothermic reaction: A chemical reaction that absorbs thermal energy from the surroundings, causing a temperature drop. Some dissolving processes and thermal decomposition reactions are endothermic.
吸热反应：从周围环境吸收热能的化学反应，导致温度下降。某些溶解过程和热分解反应是吸热的。
Efflorescence (context – signs): The change in mass of a solid because it gains or loses water of crystallisation — a useful observation indicating that a chemical reaction has occurred.
风化/潮解（现象）：固体因获得或失去结晶水而发生的质量变化，这是表明发生化学变化的一个有用现象。
10. Mnemonics and Study Tips | 记忆术与学习技巧
Remembering elements and symbols: Create short phrases where the first letter of each word matches an element symbol. For example, 'Happy Henry Likes Beer But Could Not Obtain Food' for the first few elements H, He, Li, Be, B, C, N, O, F.
记忆元素与符号：编造每一个词首字母对应元素符号的短句。如 'Happy Henry Likes Beer But Could Not Obtain Food' 对应前几位元素 H, He, Li, Be, B, C, N, O, F。
OIL RIG for redox: Oxidation Is Loss (of electrons), Reduction Is Gain (of electrons). In Year 9, adapt it as 'Oxidation Is Gain of Oxygen'.
氧化还原口诀：OIL RIG – Oxidation Is Loss (of electrons), Reduction Is Gain。九年级可以记成“氧化得氧，还原失氧”。
Neutralisation rhyme: 'Acid plus base makes salt and water, the pH climbs where it oughta.' Use rhythm to anchor the concept.
中和顺口溜：“酸加碱，盐和水，pH 往中间推。”用韵律辅助记忆。
Particle model diagrams: Draw simple circles for particles. Use close spacing for solids, touching but disordered for liquids, and widely spread for gases. Visual memory boosts recall.
粒子模型简图：用圆圈表示粒子。固体画得紧密排列，液体接触但混乱，气体分散远离。图像记忆有助于提取。
Flashcard strategy: Write a term on one side and the definition on the other. Test yourself from English to Chinese and Chinese to English. Self-quizzing is proven to strengthen long-term memory.
抽认卡策略：一面写术语，另一面写定义。从英文到中文、中文到英文双向自测。自我测验被证实能有效巩固长期记忆。
Teach a friend: Explain the terms out loud using your own examples. Teaching is one of the highest forms of learning because it forces you to clarify your understanding.
教给朋友：用你自己的例子大声解释这些术语。教授他人是最高效的学习方式之一，因为它能迫使你理清自己的理解。
Published by TutorHao | Chemistry Revision Series | aleveler.com
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