📚 KS3 AQA Chemistry Vocabulary Quick-Memorization Guide | KS3 AQA 化学：词汇术语速记指南
Chemistry has its own language, and mastering the key terms is the first step to understanding the subject. This guide provides simple memory tricks, clear definitions, and helpful associations to help you quickly memorise the essential KS3 AQA Chemistry vocabulary. Each term is explained in paired English and Chinese to support bilingual learning.
化学有着自己的语言，掌握关键术语是理解这门学科的第一步。本指南通过简单的记忆技巧、清晰的定义和有用的联想，帮助你快速记住 KS3 AQA 化学的核心词汇。每个术语都配以中英双语的解释，便于双语学习。
1. Atoms, Elements and Compounds | 原子、元素与化合物
An atom is the smallest particle of an element that can exist. Everything around you is made of atoms. An element is a pure substance made up of only one type of atom. For example, a piece of pure gold contains only gold atoms. A compound is formed when atoms of two or more different elements chemically join together. Water (H₂O) is a compound made of hydrogen and oxygen atoms bonded together.
原子是能够存在的元素的最小粒子。你周围的一切都是由原子构成的。元素是只由一种原子构成的纯净物。例如，一块纯金只含有金原子。当两种或以上不同元素的原子通过化学方式结合时，就形成了化合物。水 (H₂O) 是由氢原子和氧原子结合而成的化合物。
Memory trick: Think of ‘atom’ as ‘a tiny tomato’ – the smallest unit you can imagine. ‘Element’ sounds like ‘elementary’, where everything is simple and made of one type. ‘Compound’ suggests ‘combination’; picture a camp compound where tents are ‘compounded’ together from different materials.
记忆技巧：把 'atom' 想成 'a tiny tomato'（一个小番茄）——你能想象的最小单位。'Element' 听起来像 'elementary'（基础的），一切都是简单的，只由一种类型构成。'Compound' 暗示 '组合'；想象一个营地（compound），那里用不同的材料搭起了帐篷。
2. Mixtures and Pure Substances | 混合物与纯净物
A pure substance contains only one type of material – either a single element or a single compound. A mixture, on the other hand, consists of two or more substances that are not chemically joined. Air is a mixture of gases such as nitrogen, oxygen and argon. You can often separate a mixture using physical methods like filtering or evaporation.
纯净物只含有一种物质，要么是一种元素，要么是一种化合物。而混合物则是由两种或以上没有通过化学键结合的物质组成。空气就是一种混合物，包含氮气、氧气和氩气等。你通常可以用过滤或蒸发等物理方法分离混合物。
Memory trick: Pure substance = pure, just one ‘ ember that mixtures do not have fixed compositions and each part keeps its own properties.
记忆技巧：纯净物 (Pure substance) = 纯粹，故事里只有一个‘角色’。混合物 (Mixture) = 混合在一起，就像一碗有各种配料的麦片，你仍然可以把它们分开。记住混合物没有固定的组成，每一部分都保持自己的性质。
3. Physical and Chemical Changes | 物理变化与化学变化
A physical change alters the form or state of a substance but does not create a new substance. Melting ice into water is a physical change because you still have H₂O. A chemical change, however, produces one or more new substances. When iron rusts, it forms iron oxide – a new substance with different properties. Signs of a chemical change include fizzing, colour change, temperature change or light produced.
物理变化改变了物质的形式或状态，但没有生成新的物质。冰融化成水是一种物理变化，因为仍然是 H₂O。然而，化学变化会产生一种或多种新物质。铁生锈时形成氧化铁，这是一种性质不同的新物质。化学变化的迹象包括冒泡、颜色变化、温度变化或发出光。
Memory trick: Physical change – think ‘physics’, nothing new is born. Chemical change – think ‘chemistry magic’, new spells (substances) appear. You can remember with the phrase: ‘Can you get it back?’ If you can easily reverse it, it is likely a physical change.
记忆技巧：物理变化——想到 'physics'（物理），没有新东西诞生。化学变化——想到 'chemistry magic'（化学魔法），新的咒语（物质）出现了。你可以用一句话记住：‘你能让它变回来吗？’如果很容易逆转，那很可能是物理变化。
4. Reactants, Products and Word Equations | 反应物、生成物与文字方程式
In a chemical reaction, the starting substances are called reactants. The new substances made are called products. A word equation shows the names of reactants and products in a simple format. For example, when magnesium burns in oxygen, the word equation is:
在化学反应中，起始物质称为反应物。生成的新物质称为生成物。文字方程式以简单格式用物质名称表示反应物和生成物。例如，镁在氧气中燃烧的文字方程式为：
magnesium + oxygen → magnesium oxide
镁 + 氧气 → 氧化镁
ctants are always on the left of the arrow, and products on the right. The arrow (→) means ‘reacts to produce’.
反应物总是写在箭头的左边，生成物在右边。箭头 (→) 表示‘反应生成’。
Memory trick: Reactants – they ‘react’, like actors before the show. Products – what is ‘produced’ after the show. Think of the arrow as a magic wand that transforms reactants into products.
记忆技巧：反应物 (Reactants)——它们‘反应’，就像演出前演员。生成物 (Products)——演出后‘产生’的东西。把箭头想象成把反应物变成生成物的魔杖。
5. The pH Scale and Indicators | pH 值与指示剂
The pH scale measures how acidic or alkaline a solution is. It runs from 0 to 14, with 7 being neutral. Solutions with a pH less than 7 are acidic; those with a pH greater than 7 are alkaline. Indicators are special dyes that change colour depending on the pH. Litmus paper turns red in acid and blue in alkali. Universal indicator gives a range of colours across the pH scale.
pH 值范围用来衡量溶液的酸性或碱性程度，范围从 0 到 14，7 为中性。pH 小于 7 的溶液呈酸性，大于 7 的呈碱性。指示剂是一种特殊染料，会根据 pH 值改变颜色。石蕊试纸在酸性中变红，在碱性中变蓝。通用指示剂会在整个 pH 范围内显示多种颜色。
Memory trick: pH – ‘ of H⁺ ions (acids). Think of the number line: 7 is the middle, like a neutral friend. Acids taste sour (lemon) and alkalis feel soapy. Remember ‘A’ in Acid and ‘A’ for ‘low’ pH – Acid has low pH number.
记忆技巧：pH——‘氢离子浓度’。低 pH = 大量 H⁺ （酸）。想想数轴：7 在中间，像个中立的朋友。酸尝起来是酸的（柠檬），碱感觉滑滑的。记住酸 (Acid) 中的 'A' 对应低 (A low) pH 值——酸性的 pH 值低。
6. Acids, Bases and Neutralisation | 酸、碱与中和反应
Acids are substances that release hydrogen ions (H⁺) when dissolved in water. Common acids include hydrochloric acid (HCl) and sulfuric acid (H₂SO₄). Bases are substances that can neutralise acids; a base that dissolves in water is called an alkali. Alkalis produce hydroxide ions (OH⁻). Neutralisation is the reaction between an acid and a base to produce a salt and water. For example:
酸是溶于水时会释放出氢离子 (H⁺) 的物质。常见的酸包括盐酸 (HCl) 和硫酸 (H₂SO₄)。碱是能够中和酸的物质；可溶于水的碱称为碱液。碱液会产生氢氧根离子 (OH⁻)。中和反应是酸和碱反应生成盐和水。例如：
hydrochloric acid + sodium hydroxide → sodium chloride + water
盐酸 + 氢氧化钠 → 氯化钠 + 水
Memory trick: Neutralisation brings pH back to 7 – neutral, like an agreement. Think of acid and alkali as two opposite teams; when they meet they form a harmless salt and water. ‘Alkali’ has the word ‘kal’ which sounds like ‘calm’ – they calm the acid down.
记忆技巧：中和反应使 pH 回到 7——中性，像达成协议。把酸和碱想象成两个对立的队伍；它们相遇时会生成无害的盐和水。'Alkali' 中有 'kal'，听起来像 'calm'（平静）——它们让酸平静下来。
7. States of Matter and Changes of State | 物质状态与状态变化
Matter exists in three main states: solid, liquid and gas. In a solid, particles are tightly packed in a regular pattern and only vibrate. In a liquid, particles are close but can slide past each other. In a gas, particles are far apart and move quickly in all directions. Changes of state are physical changes. Melting and boiling take in energy, while condensing and freezing release energy. The terms boiling and evaporation are different: boiling occurs at a specific temperature throughout the liquid, while evaporation happens at the surface at any temperature.
物质主要以三种状态存在：固态、液态和气态。固态中，粒子紧密排列成规则的结构，只能振动。液态中，粒子靠近但可以相互滑动。气态中，粒子相距很远，快速朝各个方向运动。状态变化是物理变化。熔化和沸腾吸收能量，而冷凝和凝固释放能量。沸腾和蒸发的术语不同：沸腾在特定温度下在整个液体中发生，而蒸发可以在任何温度下在液体表面发生。
Memory trick: Solid – particles stand ‘solid’ like soldiers. Liquid – particles ‘lick’ and move around. Gas – particles ‘gasp’ and spread out. For changes, remember ‘MELT’ – Making Energy Leave Turns? No – melting needs energy, so ‘Melt’ starts with M like ‘More energy’. Freezing – ‘Freeze’ means energy Freezes out.
记忆技巧：固态 (Solid)——粒子像士兵一样‘牢固’地站立。液态 (Liquid)——粒子像舔 (lick) 一样流动。气态 (Gas)——粒子喘着气 (gasp) 分散开。对于变化，记住熔化 (Melt) 需要更多能量 (More energy)，而凝固 (Freeze) 释放能量。
8. Separation Techniques | 分离技术
Mixtures can be separated by physical methods based on differing properties. Filtration separates an insoluble solid from a liquid, for example sand from water. Evaporation can recover a dissolved solid from a solution by boiling off the liquid. Distillation separates a solvent from a solution by boiling and then condensing the vapour, collecting the pure liquid. Chromatography separates dissolved substances that travel at different speeds through a medium like paper.
混合物可以根据物质的不同性质用物理方法分离。过滤用于将不溶性固体从液体中分离，比如将沙子从水中分离出来。蒸发通过煮沸液体来从溶液中回收溶解的固体。蒸馏通过沸腾然后冷凝蒸气来分离溶剂，收集到纯液体。色谱法根据溶解物质在介质（如滤纸）中移动速度的不同来分离它们。
Memory trick: Filtration – think of a filter like a sieve that holds back the solids. Evaporation – the liquid ‘evaporates’ into the air leaving the solid behind. Distillation – the liquid does a ‘distinct’ journey to another container. Chromatography – ‘chrom’ means colour, so it separates colours.
记忆技巧：过滤——把过滤器想象成一个筛子，把固体拦住。蒸发——液体‘蒸发’到空气中，留下固体。蒸馏——液体进行了一次‘独特的’旅程，到达另一个容器。色谱法——'chrom' 意思是颜色，所以它用来分离颜色。
9. The Periodic Table and Groups | 周期表与族
The periodic table arranges all known elements in order of increasing atomic number. Elements are placed in rows called periods and columns called groups. Elements in the same group have similar chemical properties because they have the same number of electrons in their outer shell. Group 1 elements are the alkali metals, which are very reactive and soft. Group 7 elements are the halogens, reactive non-metals. Group 0 (or 8) are the noble gases, which are unreactive because they have a full outer shell.
周期表按照原子序数递增的顺序排列所有已知元素。元素排成横行称为周期，竖列称为族。同一族中的元素化学性质相似，因为它们的最外层电子数相同。第 1 族是碱金属，它们非常活泼且质地柔软。第 7 族是卤素，是活泼的非金属。第 0 族（或第 8 族）是惰性气体，它们因为最外层电子已满而不活泼。
Memory trick: ‘Groups are like families – same family, similar behaviour.’ Periods tell you the number of electron shells. Group 1: one electron in outer shell, willing to give it away – these elements ‘go crazy’ reacting. Group 0: full outer shell, so they are ‘zero’ interested in reacting.
记忆技巧：‘族就像家庭——同一个家庭，相似的行为。’周期告诉你电子层的数目。第 1 族：最外层一个电子，愿意失去它——这些元素反应‘疯狂’。第 0 族：最外层全满，所以它们对反应‘零’兴趣。
10. Key Verbs for Experiments | 实验关键词汇
When writing up experiments, you need precise verbs. Measure means to use an instrument to find a value, like measuring volume with a measuring cylinder. Observe means to note what you see, hear or smell – never taste in a lab. Record means to write down your results. Control variables are the factors you keep constant to make a fair test. The independent variable is the one you change, and the dependent variable is the one you measure.
在记录实验时，你需要使用准确的动词。测量 指使用仪器获得数值，比如用量筒测量体积。观察 指记下你看到、听到或闻到的——绝不能在实验室品尝。记录 指写下你的结果。控制变量 是为进行公平实验而保持不变的因素。自变量 是你改变的那个变量，因变量 是你测量的那个变量。
Memory trick: Think of a ‘fair test’ like a race where only one thing changes – the independent variable. ‘I change the IV’ (independent variable), ‘the DV depends on that’ (dependent variable). ‘Control’ means to stay the same, like a control tower keeps planes on steady paths.
记忆技巧：把‘公平实验’想象成只有一件事改变的赛跑——自变量。‘自变量（IV）是我改变的’，‘因变量（DV）取决于它’。‘控制’意味着保持不变，就像控制塔让飞机保持稳定航线。
Other useful terms: accurate (close to the true value), precise (consistent results), reliable (can be repeated), hypothesis (a prediction you test). Remember ‘aCCurate = Correct’. ‘Precise = repeat same Price’ (all values close).
其他有用术语：准确 (接近真实值)，精确 (结果一致)，可靠 (可以重复)，假设 (你检验的预测)。记住“aCCurate = Correct”（准确即正确）。“Precise = 重复得到相同的 Price（数值）”。
Published by TutorHao | Chemistry Revision Series | aleveler.com
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