📚 Year 7 CIE Chemistry: Transition Guide | Year 7 CIE 化学：升学衔接指南
Starting Year 7 marks an exciting step in your science journey. Chemistry, the study of matter and its changes, will now be taught as a separate discipline, building on what you learned in primary school. This guide will help you transition smoothly, introducing key concepts, lab safety, and study strategies to set you up for success in CIE Lower Secondary Chemistry.
开始 Year 7 标志着你的科学之旅迈出了激动人心的一步。化学，即研究物质及其变化的学科，将作为一门独立科目进行教学，建立在你小学所学知识的基础上。本指南将帮助你顺利过渡，介绍关键概念、实验室安全和学习策略，为你在 CIE 初中化学中取得成功做好准备。
1. Welcome to Year 7 Chemistry | 欢迎来到 Year 7 化学
Chemistry is the branch of science that explores what substances are made of, their properties, and how they interact with one another. It explains everything from why ice melts to how batteries work.
化学是科学的一个分支，探索物质由什么组成、它们的性质以及它们如何相互作用。它可以解释从冰为什么融化到电池如何工作的一切现象。
In Year 7, you will no longer study 'general science'; instead, chemistry becomes a focused subject. You will learn to think like a chemist, using models and observations to understand the invisible world of atoms and particles.
在 Year 7，你将不再学习“综合科学”；相反，化学成为一门重点学科。你将学会像化学家一样思考，利用模型和观察来理解看不见的原子和粒子世界。
The skills you develop – careful observation, recording data, and drawing conclusions – are not just for exams. They are life skills that help you solve problems logically.
你所培养的技能——仔细观察、记录数据和得出结论——不仅仅是为了考试。它们是帮助你逻辑性地解决问题的生活技能。
2. From Primary Science to Chemistry | 从小学科学到化学
In primary school, you explored topics like materials, changes of state, and simple mixtures. In Year 7, we dive deeper: you will explain these phenomena using the particle theory and begin using chemical symbols.
在小学，你探索了诸如材料、状态变化和简单混合物等主题。到了 Year 7，我们深入挖掘：你将用粒子理论解释这些现象，并开始使用化学符号。
The biggest shift is moving from describing what you see to explaining why it happens at the particle level. For example, you will not just say 'ice melts when heated' but explain that heating gives particles more energy, breaking the fixed structure.
最大的转变是从描述你看到的现象转向在粒子层面解释为什么会发生。例如，你不只是说“冰加热会融化”，而是解释加热给粒子更多能量，打破了固定结构。
You will also start using the language of chemistry: words like 'element', 'compound', 'reaction', and 'molecule' will become part of your everyday vocabulary. This guide will introduce them one by one.
你也会开始使用化学语言：像“元素”“化合物”“反应”和“分子”这样的词将成为你日常词汇的一部分。本指南将逐一介绍它们。
3. Laboratory Safety First | 实验室安全第一
Before you touch any apparatus, you must know the safety rules. The chemistry lab is an exciting place, but chemicals and heat can be dangerous if not treated with respect.
在你接触任何仪器之前，你必须了解安全规则。化学实验室是一个令人兴奋的地方，但如果不谨慎对待，化学品和热源可能会很危险。
• Always wear safety goggles to protect your eyes from splashes or fumes.
• 始终佩戴安全护目镜，以保护眼睛免受飞溅物或烟雾的伤害。
• Tie back long hair and tuck in loose clothing; never run or play in the lab.
• 扎起长发，收好宽松衣物；绝不在实验室里奔跑或玩耍。
• Know the location of the fire extinguisher, fire blanket, and eyewash station.
• 知道灭火器、灭火毯和洗眼站的位置。
• Never taste chemicals or touch them with bare hands; if you spill something, inform your teacher immediately.
• 绝不用嘴尝化学品或徒手触摸它们；如果你洒出什么东西，立即告诉你的老师。
• When heating a test tube, point the mouth away from yourself and others.
• 加热试管时，管口要远离自己和他人的方向。
Safety symbols appear on chemical containers. For example, a flame symbol means flammable, and a skull symbol means toxic. Learn these symbols so you can assess risks yourself.
安全标志出现在化学品容器上。例如，火焰标志表示易燃，骷髅标志表示有毒。学习这些标志，以便你能自己评估风险。
4. The Particle Model of Matter | 物质的粒子模型
Chemists use the particle model to explain the behaviour of solids, liquids, and gases. It is based on several key ideas that you must remember:
化学家使用粒子模型来解释固体、液体和气体的行为。它基于几个你必须记住的关键观点：
All matter is made up of tiny particles. These particles can be atoms, molecules, or ions, but at this stage, we simply call them 'particles'.
所有物质都由微小的粒子组成。这些粒子可以是原子、分子或离子，但在这个阶段，我们简单地称它们为“粒子”。
The particles are constantly moving. In solids, they vibrate in fixed positions; in liquids, they slide past each other; in gases, they move rapidly in all directions.
粒子在不断地运动。在固体中，它们在固定位置上振动；在液体中，它们相互滑动；在气体中，它们向各个方向快速运动。
There are spaces between the particles. The size of these spaces changes when a substance is heated or cooled, which explains expansion and contraction.
粒子之间有空间。当物质被加热或冷却时，这些空间的大小会改变，这就解释了热胀冷缩。
The higher the temperature, the faster the particles move. This is why heating a liquid gives particles enough energy to escape the surface and become a gas.
温度越高，粒子运动得越快。这就是为什么加热液体能给粒子足够的能量逃逸表面变成气体。
5. States of Matter | 物质的状态
The three common states of matter on Earth are solid, liquid, and gas. Each state has distinct properties that can be directly linked to the particle model.
地球上常见的三种物质状态是固体、液体和气体。每种状态都有独特的性质，可以直接与粒子模型联系起来。
A solid has a fixed shape and a fixed volume. Its particles are packed closely together in a regular pattern, held by strong forces, and can only vibrate in place.
固体有固定的形状和固定的体积。它的粒子紧密排列成规则的图案，由强力束缚，只能在原地振动。
A liquid has a fixed volume but takes the shape of its container. The particles are still close together but not in a fixed arrangement; they can move around each other, making liquids flow.
液体有固定的体积，但会随容器的形状而改变。粒子仍然紧密但排列不固定；它们可以相互移动，使得液体可以流动。
A gas has no fixed shape and no fixed volume; it spreads out to fill any container. Gas particles are far apart, move very fast, and have almost no forces between them.
气体没有固定的形状和体积；它会扩散填满任何容器。气体粒子相距很远，运动很快，它们之间的作用力几乎可以忽略。
Changes of state – melting, freezing, boiling, condensing – are physical changes. The particles themselves do not change; only their arrangement and energy change.
状态变化——熔化、凝固、沸腾、冷凝——是物理变化。粒子本身没有变化；只是它们的排列和能量发生了变化。
6. Atoms, Elements and the Periodic Table | 原子、元素与周期表
An atom is the smallest particle of an element that can exist and still show the chemical properties of that element. You can think of atoms as the building blocks of all substances.
原子是元素可以存在的最小粒子，并仍然显示该元素的化学性质。你可以把原子看作所有物质的积木。
An element is a pure substance made of only one type of atom. For example, a piece of pure gold contains only gold atoms. Each element has its own symbol, usually one or two letters, such as H for hydrogen, O for oxygen, and Fe for iron.
元素是由只有一种原子组成的纯净物。例如，一块纯金只包含金原子。每种元素都有自己的符号，通常是一到两个字母，比如 H 代表氢，O 代表氧，Fe 代表铁。
The periodic table is a chart that lists all the known elements, arranged in order of increasing atomic number. Elements in the same column (group) often have similar properties.
周期表是列出所有已知元素的图表，按原子序数递增排列。同一列（族）的元素通常具有相似的性质。
In Year 7, you will learn to recognise the first 20 elements and their symbols. You will also identify metals and non-metals on the table using the zigzag line.
在 Year 7，你将学会辨认前 20 种元素及其符号。你也会利用锯齿线在表中识别金属和非金属。
7. Compounds and Mixtures | 化合物与混合物
A compound is a pure substance formed when two or more different elements chemically combine in a fixed ratio. The properties of a compound are very different from the elements that make it up.
化合物是当两种或更多不同元素以固定比例化学结合时形成的纯净物。化合物的性质与组成它的元素截然不同。
For example, water (H₂O) is a compound made of hydrogen and oxygen. Hydrogen is a flammable gas, oxygen supports combustion, yet water is a liquid that puts out fires.
例如，水 (H₂O) 是由氢和氧组成的化合物。氢是可燃气体，氧助燃，而水则是可以灭火的液体。
A mixture contains two or more substances that are not chemically joined. Each substance keeps its own properties, and the composition can vary. Air is a mixture of nitrogen, oxygen, carbon dioxide, and other gases.
混合物包含两种或更多没有化学结合的物质。每种物质保持自己的性质，组成可以变化。空气是氮气、氧气、二氧化碳和其他气体的混合物。
You can separate mixtures by physical methods (such as filtration) because no chemical bonds need to be broken. Separating compounds, however, requires chemical reactions.
你可以通过物理方法（如过滤）分离混合物，因为不需要断裂化学键。然而，分离化合物需要化学反应。
8. Introduction to Chemical Reactions | 化学反应入门
A chemical reaction involves the rearrangement of atoms to form new substances. Signs that a reaction has occurred include a colour change, a gas being given off, a precipitate forming, or a temperature change.
化学反应涉及原子重新排列形成新的物质。反应发生的迹象包括颜色变化、释放气体、形成沉淀或温度变化。
Burning magnesium ribbon in air is a classic example. Magnesium reacts with oxygen to form magnesium oxide, a white powder, releasing brilliant light and heat:
在空气中燃烧镁条是一个经典例子。镁与氧气反应生成氧化镁（一种白色粉末），并释放出耀眼的光和热：
magnesium + oxygen → magnesium oxide
镁 + 氧气 → 氧化镁
Physical changes, such as melting ice or dissolving sugar in water, do not produce new substances. Being able to distinguish a physical change from a chemical reaction is a key skill.
物理变化，如冰融化或糖溶于水，不会产生新物质。能够区分物理变化和化学反应是一项关键技能。
Word equations like the one above are used to summarise reactions. They show the reactants (starting materials) on the left and the products on the right, linked by an arrow.
像上面这样的文字方程式用于总结反应。它显示左侧的反应物（起始原料）和右侧的生成物，用箭头连接。
9. Acids and Alkalis | 酸与碱
Acids are substances that taste sour (though you must never taste lab chemicals!) and can be corrosive. Common laboratory acids include hydrochloric acid (HCl), sulfuric acid (H₂SO₄), and nitric acid (HNO₃).
酸是尝起来有酸味的物质（不过你绝不能品尝实验室化学品！），并可能具有腐蚀性。常见的实验室酸包括盐酸 (HCl)、硫酸 (H₂SO₄) 和硝酸 (HNO₃)。
Alkalis are soluble bases that feel soapy and can also be corrosive. Examples are sodium hydroxide (NaOH) and potassium hydroxide (KOH). Many household cleaners contain alkalis.
碱是可溶的碱类，摸起来有滑腻感，也可能有腐蚀性。例子有氢氧化钠 (NaOH) 和氢氧化钾 (KOH)。许多家用清洁剂含有碱。
Indicators help us test whether a substance is acidic or alkaline. Litmus paper turns red in acid and blue in alkali. Universal indicator shows the strength (pH) with a range of colours.
指示剂帮助我们测试物质是酸性还是碱性。石蕊试纸在酸中变红，在碱中变蓝。通用指示剂通过一系列颜色显示酸碱强度 (pH)。
The pH scale runs from 0 (very acidic) to 14 (very alkaline), with 7 being neutral – pure water has a pH of 7. Always handle acids and alkalis with care, wearing gloves and eye protection.
pH 标度从 0（强酸性）到 14（强碱性），7 为中性——纯水的 pH 为 7。处理酸和碱时一定要小心，戴上手套和护目镜。
10. Metals and Non-metals | 金属与非金属
Most elements are metals. Metals are usually shiny when cut or polished, good conductors of heat and electricity, malleable (can be hammered into sheets), and ductile (can be drawn into wires).
大多数元素是金属。金属在切割或抛光后通常有光泽，是热和电的良导体，具有延展性（可锤成薄片）和韧性（可拉成丝）。
Non-metals have properties that are the opposite of metals. They are often dull, poor conductors of heat and electricity, and brittle when solid. Examples include carbon, sulfur, and oxygen.
非金属具有与金属相反的性质。它们通常暗淡无光，是热和电的不良导体，固态时质脆。例子包括碳、硫和氧。
Some elements, like silicon, are called metalloids because they have properties in between metals and non-metals. The periodic table helps you classify elements at a glance.
一些元素，如硅，被称为准金属，因为它们具有介于金属和非金属之间的性质。周期表帮助你一目了然地分类元素。
You will investigate metal reactions with acids, which produce hydrogen gas. The 'pop' test with a burning splint confirms the presence of hydrogen.
你将探究金属与酸的反应，该反应产生氢气。用点燃的木条进行的“爆鸣”测试可确认氢气的存在。
11. Separation Techniques | 分离技术
Chemists often need to separate mixtures to obtain pure substances. The method chosen depends on the physical properties of the components in the mixture.
化学家经常需要分离混合物以获得纯净物质。选择的方法取决于混合物中各组分的物理性质。
Filtration separates an insoluble solid from a liquid. The mixture is poured through filter paper; the solid residue stays on the paper, and the liquid filtrate passes through.
过滤用于分离不溶性固体和液体。将混合物倒入滤纸；固体残渣留在纸上，液体滤液通过。
Evaporation and crystallisation are used to obtain a soluble solid from a solution. By heating the solution, the solvent (often water) evaporates, leaving the solid behind. For large crystals, slow cooling is used.
蒸发和结晶用于从溶液中得到可溶性固体。通过加热溶液，溶剂（通常是水）蒸发，留下固体。要得到大晶体，则采用缓慢冷却的方法。
Simple distillation separates a solvent from a solution by boiling and condensing. The liquid with the lower boiling point evaporates first, then condenses back into liquid in a condenser.
简单蒸馏通过沸腾和冷凝将溶剂从溶液中分离出来。沸点较低的液体先蒸发，然后在冷凝管中冷凝回液体。
Chromatography separates coloured substances, such as inks or food dyes. The sample is spotted onto paper, and a solvent travels up, carrying the dyes at different rates.
色谱法用于分离有色物质，如墨水或食用色素。将样品点在纸上，溶剂向上移动，以不同速率携带染料。
12. Study Tips and Looking Ahead | 学习技巧与未来展望
Success in Year 7 chemistry comes from being curious and organised. Here are some practical tips to help you build strong foundations:
Year 7 化学的成功来自好奇心和条理性。这里有一些实用的技巧来帮助你打下坚实的基础：
Make your own glossary of key terms – write the word, a simple definition in English, and its Chinese equivalent. Review it regularly.
制作自己的关键术语词汇表——写下术语、英语的简单定义及其中文对应词。定期复习。
After each practical, write a short reflection: what you did, what you saw, and what it means using the particle model.
每次实验后，写一个简短的反思：你做了什么，看到了什么，以及用粒子模型解释意味着什么。
Practise drawing labelled diagrams of apparatus and particle arrangements. Visuals help you remember concepts faster than words alone.
练习绘制仪器的标记图和粒子排列图。视觉图像比单纯的文字能帮助你更快记住概念。
Use CIE endorsed resources and past checkpoint papers to test your understanding. Don't just memorise; ask 'why' and try to explain to a friend.
使用 CIE 官方认可的资源以及过去的 checkpoint 试卷来测验你的理解。不要仅仅是记忆；多问“为什么”，并试着向朋友解释。
Looking ahead, Year 7 chemistry prepares you for more advanced topics in Year 8 and 9, and eventually for IGCSE Chemistry. The thinking skills you develop now – linking macroscopic observations to the particle world – will be your greatest tool.
展望未来，Year 7 化学为 Year 8 和 9 更高阶的主题，并最终为 IGCSE 化学做好准备。你现在培养的思维技能——将宏观观察和粒子
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