Year 7 CAIE Chemistry: Quick Memorisation Guide for Key Terms | Year 7 CAIE 化学：词汇术语速记指南

📚 Year 7 CAIE Chemistry: Quick Memorisation Guide for Key Terms | Year 7 CAIE 化学：词汇术语速记指南

Chemistry can seem like a foreign language at first, but once you learn the key words, everything starts to make sense. This guide is designed for Year 7 CAIE Chemistry students to quickly build a strong vocabulary. We will cover essential terms, their meanings, and memory hacks that will make them stick.

化学最初可能像一门外语，但一旦你学会了关键词汇，一切都会变得清晰明了。本指南专为 Year 7 CAIE 化学学生设计，帮助你们快速建立扎实的词汇基础。我们将涵盖重要术语、其含义以及让它们牢记在心的记忆技巧。

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1. Laboratory Equipment | 实验室器材

Beaker: A wide glass container with a flat bottom and a small spout, used for mixing, heating and holding liquids. Memory tip: The word “beaker” sounds like “beak”, the mouth of a bird – perfect for a container with a pouring lip.

烧杯：一种平底宽口玻璃容器，带有一个小嘴，用于混合、加热和盛放液体。记忆技巧：”beaker” 发音类似 “beak”（鸟嘴），正好对应带嘴的容器。

Conical flask (Erlenmeyer flask): A glass flask with a flat bottom, a conical body and a narrow neck. It is used for mixing by swirling without spilling. Memory tip: “Conical” means cone-shaped – imagine an ice cream cone without the top.

锥形瓶（三角烧瓶）：平底、锥形瓶身、细颈的玻璃瓶，用于通过旋转振荡混合液体而不会溅出。记忆技巧：”conical” 就是圆锥形，想象一个去掉了尖端的蛋筒冰淇淋。

Test tube: A small cylindrical glass tube used to hold, heat or mix small amounts of substances. Memory tip: You “test” small samples in these tubes.

试管：一种小的圆柱形玻璃管，用于盛放、加热或混合少量物质。记忆技巧：你在这些管子里”测试(test)”少量样品。

Measuring cylinder: A tall, narrow container with volume markings used to measure liquid volume accurately. Memory tip: It is a cylinder that measures – simple!

量筒：一种高而窄、标有体积刻度的容器，用于精确测量液体体积。记忆技巧：它是一个用于测量(measure)的圆筒(cylinder)。

Bunsen burner: A gas burner producing a single open flame, used for heating. Memory tip: Named after Robert Bunsen; imagine a “bun” being toasted over the ‘sen burner!

本生灯：一种产生单一明火的气体燃烧器，用于加热。记忆技巧：以罗伯特·本生命名；想象一个小圆面包(bun)在本生灯上烤。

Tripod: A three-legged metal stand used to support a beaker or flask over a Bunsen burner. Memory tip: “Tri-” means three, and “pod” means feet – think of a three-footed stool.

三脚架：一种三脚的金属支架，用于在本生灯上方支撑烧杯或烧瓶。记忆技巧：”Tri-” 表示三，”pod” 表示脚，想象一个三条腿的凳子。

Gauze (wire gauze): A mesh of thin metal wires placed on a tripod to spread the heat of a flame evenly. Memory tip: It looks like a metallic version of a bandage “gauze”.

石棉网（金属网）：放在三脚架上的一块细金属丝网，用于均匀分散火焰热量。记忆技巧：它看起来像金属版本的纱布(gauze)。

Funnel: A cone-shaped utensil with a wide opening and a narrow stem, used for pouring liquids or fine powders into containers with small openings. Memory tip: It acts like a “tunnel” for liquids.

漏斗：一种锥形器具，上宽下窄，用于将液体或细粉末倒入小口容器中。记忆技巧：它就像液体的“隧道(tunnel)”。

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2. States of Matter | 物质的状态

Solid: The state of matter with a fixed shape and fixed volume. Particles are tightly packed in a regular pattern and can only vibrate in place. Memory tip: In solids, particles are like students sitting in fixed seats in a classroom.

固体：具有固定形状和固定体积的物质状态。粒子紧密排列成规则图案，只能在原位振动。记忆技巧：固体中的粒子就像教室里坐在固定座位上的学生。

Liquid: The state of matter with a fixed volume but no fixed shape; it takes the shape of its container. Particles are close together but can slide past each other. Memory tip: Think of a crowded dance floor where people move but stay in contact.

液体：有固定体积但没有固定形状的物质状态；它随容器形状而变。粒子彼此靠近，但可以相互滑过。记忆技巧：想象一个拥挤的舞池，人们移动但仍保持接触。

Gas: The state of matter with no fixed shape or volume; it spreads out to fill its container. Particles are far apart and move rapidly in all directions. Memory tip: Gas particles are like bouncing balls in an empty room, moving freely everywhere.

气体：没有固定形状和体积的物质状态；它会扩散充满整个容器。粒子相距很远，快速向各个方向运动。记忆技巧：气体粒子就像空房间里到处弹跳的球，自由移动。

Melting: The change of state from solid to liquid when heat is added. Memory tip: “Melt” starts with “m” like “make liquid”.

熔化：加热时物质从固态变为液态的过程。记忆技巧：”melt” 以 “m” 开头，就像 “make liquid”（变成液体）。

Freezing: The change of state from liquid to solid when heat is removed. Memory tip: Water freezes into ice; think of “freeze” as the opposite of “melt”.

凝固：移除热量时物质从液态变为固态的过程。记忆技巧：水凝固成冰；”freeze” 就是 “melt” 的反义词。

Boiling: The rapid change of state from liquid to gas throughout the liquid, occurring at a specific temperature called the boiling point. Memory tip: Boiling water bubbles violently – you see bubbles “boiling” up.

沸腾：在特定温度（沸点）下，整个液体中液态物质快速变为气态的过程。记忆技巧：沸腾的水剧烈冒泡——你看到气泡“沸腾”上升。

Evaporation: The slow change of state from liquid to gas that occurs only at the surface, at any temperature. Memory tip: “Evaporation” makes water “evaporate” like vapour rising from a puddle on a sunny day.

蒸发：仅在表面发生的、任何温度下液态缓慢变为气态的过程。记忆技巧：”evaporation” 使水像晴天水坑中的蒸气一样”蒸发”消失。

Condensation: The change of state from gas to liquid when a gas is cooled. Memory tip: When you breathe on a cold mirror, water vapour condenses into tiny droplets – “condense” means to become dense.

凝结：气体冷却时从气态变为液态的过程。记忆技巧：当你对着冷镜子哈气，水蒸气凝结成小水滴——”condense” 表示变得密集。

Sublimation: The direct change of state from solid to gas without passing through the liquid state, e.g., dry ice (solid carbon dioxide). Memory tip: “Sublime” means excellent; think of a solid “skipping” the liquid phase, which is a pretty cool trick.

升华：不经过液态，直接从固态变为气态的过程，例如干冰（固体二氧化碳）。记忆技巧：”sublime” 意为卓越的；想象固体”跳过”液态阶段，这招很酷。

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3. Particle Theory | 粒子理论

Particle: A tiny piece of matter that makes up all substances. In particle theory, particles can be atoms, molecules or ions. Memory tip: Think of particles as the building blocks of everything, like tiny LEGO bricks.

粒子：构成所有物质的微小单元。在粒子理论中，粒子可以是原子、分子或离子。记忆技巧：把粒子想象成万物的积木，像微小的乐高砖块。

Arrangement of particles: How particles are organised in solids, liquids and gases. In solids they are regular and packed; in liquids they are random and close; in gases they are random and far apart. Memory tip: Recall the classroom (solid), dance floor (liquid) and bouncing balls (gas) pictures from the states of matter.

粒子排列：粒子在固体、液体和气体中的组织方式。固体中规则紧密排列；液体中随机但靠近；气体中随机且远离。记忆技巧：回想物质状态中的教室（固体）、舞池（液体）和弹跳球体（气体）画面。

Movement of particles: Particles are always moving. In solids they vibrate; in liquids they slide past each other; in gases they move fast and freely. Memory tip: As temperature increases, particles gain more energy and move faster – “The hotter, the wilder!”

粒子运动：粒子总是在运动。固体中振动；液体中相互滑过；气体中快速自由运动。记忆技巧：随着温度升高，粒子获得更多能量，运动更快——”越热越疯狂！”

Diffusion: The movement of particles from a region of higher concentration to a region of lower concentration, resulting in their even distribution. Memory tip: Think of the smell of perfume spreading across a room – it “diffuses” from high concentration near the bottle to low concentration elsewhere.

扩散：粒子从高浓度区域向低浓度区域运动，最终达到均匀分布的过程。记忆技巧：想象香水气味在房间中扩散——从瓶子附近的高浓度”扩散”到其他地方的低浓度。

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4. Elements, Compounds and Mixtures | 元素、化合物和混合物

Atom: The smallest particle of an element that can exist and still retain the chemical properties of that element. Memory tip: “Atom” comes from the Greek “atomos” meaning indivisible (though we know now it can be split, for Year 7 think of it as the basic unit).

原子：能够存在并保持元素化学性质的最小粒子。记忆技巧：”atom” 源自希腊语 “atomos”，意为不可分割（尽管我们知道它可以分裂，对于 Year 7 把它当作基本单元）。

Element: A pure substance made up of only one type of atom. It cannot be broken down into simpler substances by chemical means. Memory tip: Think of the Periodic Table as a menu of elements – each square is a different kind of atom.

元素：只由一种原子构成的纯物质，不能通过化学方法分解为更简单的物质。记忆技巧：把元素周期表想象成元素的菜单——每个方块就是一种不同的原子。

Molecule: A group of two or more atoms chemically bonded together. For example, an oxygen molecule (O₂) contains two oxygen atoms. Memory tip: A molecule is a “mole” of atoms held together; imagine a cluster of atoms holding hands.

分子：两个或以上原子通过化学键结合而成的基团。例如，一个氧分子(O₂)含有两个氧原子。记忆技巧：分子是一群原子手拉手集群。

Compound: A pure substance made up of two or more different types of atoms chemically bonded together. It has a fixed composition and properties different from its elements. Example: Water (H₂O) is a compound of hydrogen and oxygen. Memory tip: “Compound” means composed of multiple parts – think of a compound word like “toothpaste”, made from “tooth” and “paste”.

化合物：由两种或以上不同种类的原子通过化学键结合而成的纯物质。它有固定的组成，性质与其组成元素不同。例子：水(H₂O)是氢和氧的化合物。记忆技巧：”compound” 意为由多个部分组成——想想复合词如 “toothpaste”（牙膏），由 “tooth” 和 “paste” 组成。

Mixture: A combination of two or more substances that are not chemically joined and can be separated by physical means. Memory tip: A mixture is like a mixed fruit salad – you can pick out the individual pieces.

混合物：两种或以上物质混合而成，它们不通过化学键结合，可以用物理方法分离。记忆技巧：混合物就像什锦水果沙拉——你可以把单个果块挑出来。

Pure substance: A single element or compound that has a fixed melting and boiling point. Memory tip: “Pure” gold means it is only gold, not mixed with other metals.

纯物质：具有固定熔点和沸点的单质或化合物。记忆技巧：”纯”金意味着它只是金，没有混入其他金属。

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5. Physical and Chemical Changes | 物理变化和化学变化

Physical change: A change in which no new substance is formed, and the process is usually reversible. Examples: melting ice, dissolving sugar in water. Memory tip: Physical changes alter appearance or state but not chemical identity – think “physical” as only changing the physique.

物理变化：没有新物质生成，通常可以逆转的变化。例子：冰融化，糖溶于水。记忆技巧：物理变化改变外观或状态，但不改变化学身份——”physical” 就像只改变外形(physique)。

Chemical change: A change in which one or more new substances are formed, often accompanied by energy changes, and usually irreversible. Examples: rusting of iron, burning wood. Memory tip: Chemical changes create something new – you cannot un-burn a match.

化学变化：生成一种或多种新物质的变化，常伴随能量变化，通常不可逆。例子：铁生锈，木头燃烧。记忆技巧：化学变化创造出新物质——你无法让燃烧过的火柴恢复原样。

Reactant: A starting substance in a chemical reaction. Memory tip: “Re-act-ant” – it acts again to form products.

反应物：化学反应中起始的物质。记忆技巧：”反应物” 是参与反应的东西。

Product: A substance formed in a chemical reaction. Memory tip: Products are what the reaction “produces”.

生成物：化学反应中生成的物质。记忆技巧：生成物是反应 “生产” 出来的。

Precipitate: An insoluble solid that emerges from a liquid solution during a chemical reaction. Memory tip: Think of “precipitation” like rain – solid appearing out of clear liquid, just as rain falls from clouds.

沉淀：在化学反应中从液体溶液中析出的不溶性固体。记忆技巧：想象 “precipitation”（降水）- 固体从清澈液体中出现，就像雨从云中落下。

Reversible reaction: A reaction in which the products can react to re-form the reactants. For physical changes, many are reversible, but some chemical reactions are also reversible. Memory tip: Remember “reverse” – you can go backwards.

可逆反应：生成物可反应重新形成反应物的反应。许多物理变化是可逆的，但有些化学反应也可逆。记忆技巧：记住 “reverse”（倒转）——你可以倒回去。

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6. Acids and Alkalis | 酸和碱

Acid: A substance that releases hydrogen ions (H⁺) in water, has a sour taste, and turns blue litmus paper red. Examples: lemon juice (citric acid), vinegar (acetic acid). Memory tip: Think of “acid” as “a-cid” (cid sounds like ‘sid’ in ‘sour’) – sour is a clue.

酸：在水中释放氢离子(H⁺)、有酸味、能使蓝色石蕊试纸变红的物质。例子：柠檬汁(柠檬酸)，醋(醋酸)。记忆技巧：联想到 “acid” 和 “sour” 酸味。

Alkali: A soluble base that releases hydroxide ions (OH⁻) in water, feels soapy, and turns red litmus paper blue. Examples: sodium hydroxide solution, soap. Memory tip: “Alkali” sounds like “al-kay-lie” – remember that alkalis make litmus blue, and ‘alkali’ starts with ‘al’ like ‘alkaline battery, basic’.

碱：可溶性碱，在水中释放氢氧根离子(OH⁻)，手感滑腻，能使红色石蕊试纸变蓝。例子：氢氧化钠溶液，肥皂。记忆技巧：”alkali” 发音像 “al-ka-lie”，碱使石蕊变蓝，’alkali’ 以 ‘al’ 开头，像 alkaline battery（碱性电池）。

Neutral: A substance that is neither acidic nor alkaline, with a pH of 7. Example: pure water. Memory tip: “Neutral” means neither side – like a neutral country in a conflict, it doesn’t pick a side between acid and alkali.

中性：既不是酸性也不是碱性的物质，pH 值为 7。例子：纯水。记忆技巧：”neutral” 意为中立——就像冲突中的中立国，在酸和碱之间不

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