📚 Year 7 Cambridge Chemistry: Bridging Guide | Year 7 剑桥化学：升学衔接指南
Moving from Year 7 to Year 8 and beyond in Cambridge Lower Secondary Science can feel like a big step, especially in Chemistry. This bridging guide is designed to help you strengthen core concepts you have already learned and preview the exciting topics that lie ahead, giving you a solid foundation for IGCSE Chemistry.
从 Year 7 升入 Year 8 乃至更高年级的剑桥初中科学阶段，化学部分会变得更具挑战。这份衔接指南旨在帮助你巩固已学的核心概念，并预演接下来将遇到的精彩内容，为你未来的 IGCSE 化学打下坚实基础。
1. Scientific Method and Lab Safety | 科学方法与实验安全
In Year 7, you learned how to ask scientific questions, make hypotheses, and plan fair tests. These skills are the backbone of all experimental work you will do in Chemistry.
在 Year 7，你已经学会如何提出科学问题、作出假设并设计公平测试。这些技能是你今后进行所有化学实验的基础。
Key concepts from Year 7 include identifying variables (independent, dependent, control) and understanding the importance of safety rules, such as wearing goggles and tying back hair.
Year 7 的关键概念包括识别变量（自变量、因变量、控制变量）以及理解安全规则的重要性，例如佩戴护目镜和束起头发。
As you progress, you will plan more complex investigations and learn to evaluate data critically. Always remember the hazard symbols you encountered: flammable, corrosive, irritant, etc.
随着学习深入，你将设计更复杂的探究活动并学会批判性地评估数据。请始终牢记你学过的危险品标志：易燃、腐蚀、刺激等。
Make it a habit to write a clear method and a risk assessment before starting any practical work. This is a skill that examiners value from Year 8 all the way to IGCSE.
养成在动手操作前书写清晰实验步骤和风险评估的习惯。这项技能从 Year 8 到 IGCSE 都备受考官重视。
2. The Particle Model of Matter | 物质的粒子模型
The particle model is one of the most powerful ideas in Chemistry. You learned that all matter is made of tiny particles that are constantly moving. The spaces between particles and their movement explain the properties of solids, liquids and gases.
粒子模型是化学中最有力的概念之一。你已经学到，所有物质都由不断运动的微小粒子组成。粒子之间的空隙及其运动方式能解释固体、液体和气体的性质。
In Year 7, you used the particle model to explain diffusion (e.g., perfume spreading in air) and dissolving. In higher years, you will use the model to understand changes of state, gas pressure, and even chemical reactions.
在 Year 7，你用粒子模型解释了扩散（如香水在空气中弥散）和溶解过程。到了更高年级，你将运用该模型理解物态变化、气体压强甚至化学反应。
Important terms to revise: particle, arrangement, motion, energy, space. Remember, particles themselves do not change during a physical change—only their arrangement and energy do.
需要复习的重要术语：粒子、排列、运动、能量、空隙。记住，在物理变化中粒子本身不发生改变——变化的只是它们的排列和能量。
Draw diagrams using circles to represent particles in solids, liquids and gases. This visual skill directly supports your understanding of kinetic theory in later years.
用圆圈作图来表示固体、液体和气体中的粒子。这种可视化技能能直接支持你日后对分子动理论的理解。
3. States of Matter and Changes of State | 物质的状态与变化
You have already explored solids, liquids, and gases, along with processes like melting, freezing, boiling, evaporation, condensation, and sublimation.
你已经探索了固体、液体和气体，以及熔化、凝固、沸腾、蒸发、冷凝和升华等过程。
The key learning point from Year 7 is that temperature remains constant during a change of state because energy is used to overcome forces rather than to raise kinetic energy. This explains the flat sections on heating/cooling curves.
Year 7 的核心知识点是：在物态变化过程中温度保持不变，因为此时能量用于克服粒子间作用力，而非用来增加动能。这解释了加热/冷却曲线中的平直段。
To prepare for more advanced work, practise drawing and interpreting these curves, and relate them to particle behaviour. You will later apply these ideas to explain distillation and chromatography techniques.
为了迎接更深入的学习，请练习绘制并解读这类曲线，并联系粒子行为加以解释。日后你将运用这些原理解释蒸馏和色谱技术。
Also, be aware that the term ‘sublimation’ can be used for both solid-to-gas transitions (e.g., dry ice) and the reverse, deposition. Keep this vocabulary fresh.
此外，注意“升华”一词既可指固体直接变成气体（如干冰），也可指反向的凝华过程。请保持对这些术语的熟练掌握。
4. Elements, Compounds and Mixtures | 元素、化合物与混合物
Distinguishing between elements, compounds and mixtures is fundamental. An element is made of only one type of atom; a compound contains two or more different elements chemically bonded; a mixture consists of two or more substances not chemically combined.
区分元素、化合物和混合物是一项基础能力。元素仅由一种原子构成；化合物含有两种或以上不同元素，并以化学键结合；混合物由两种或以上未发生化学结合的物质组成。
Year 7 introduced the periodic table as a list of elements, each with a symbol. You now need to become confident using symbols for common elements (H, He, Li, C, N, O, Na, Mg, Al, Si, P, S, Cl, K, Ca, Fe, Cu, Zn, etc.) and recognising that symbols can have one or two letters, with the second always lowercase.
Year 7 介绍了元素周期表，它是元素的列表，每种元素都有独特的符号。现在你需要熟练使用常见元素的符号（H、He、Li、C、N、O、Na、Mg、Al、Si、P、S、Cl、K、Ca、Fe、Cu、Zn 等），并认识到符号可以由一到两个字母组成，第二个字母必须小写。
You also separated mixtures using filtration, evaporation, magnetic separation, and sieving. Extend this to understand that compounds require chemical reactions to be broken down, while mixtures can be separated by physical means.
你还曾通过过滤、蒸发、磁分离和过筛来分离混合物。要延伸理解：化合物需要通过化学反应才能分解，而混合物可用物理方法分离。
Create a sorting diagram to classify everyday materials (air, table salt, iron, orange juice, etc.) into elements, compounds and mixtures. This type of exercise strengthens your conceptual understanding.
制作分类图，将日常材料（空气、食盐、铁、橙汁等）分别归入元素、化合物和混合物。这类练习能加深你的概念理解。
5. Introducing Atoms and Molecules | 原子与分子入门
Although atomic structure is usually taught in more detail in Year 8 or IGCSE, Year 7 gives you the first glimpse: an atom is the smallest part of an element that can take part in a chemical change.
虽然原子结构通常要到 Year 8 或 IGCSE 阶段才详细讲解，但 Year 7 已让你初步知晓：原子是能参与化学变化的最小单位。
You may have seen simple molecular models, showing atoms joined together. A molecule is a group of atoms bonded together, which can be the same element (e.g., O₂) or different elements (e.g., H₂O).
你可能见过简单的分子模型，展示原子连接在一起。分子是一组以化学键结合的原子，可以是同种元素（如 O₂），也可以是不同元素（如 H₂O）。
For a smooth transition, start learning to interpret chemical formulas: subscripts tell us the number of atoms. For example, CO₂ has one carbon atom and two oxygen atoms. This will be essential when you write and balance equations later.
为实现顺利过渡，请开始学习解读化学式：下标数字告诉我们原子的个数。例如，CO₂ 含有一个碳原子和两个氧原子。这对于日后书写并配平化学方程式至关重要。
Another concept to explore is the conservation of mass in a reaction—atoms are rearranged, not created or destroyed. You will meet this principle again and again.
另一个值得探索的概念是反应中的质量守恒——原子只是重新排列，既不会凭空产生也不会消失。这一原则将在今后反复遇到。
6. Chemical Reactions versus Physical Changes | 化学反应与物理变化
Year 7 taught you how to recognise a chemical reaction: there is often a colour change, a temperature change (exothermic or endothermic), a gas given off (effervescence), or a precipitate formed. A new substance is always produced.
Year 7 教会你如何识别化学反应：通常伴有颜色变化、温度变化（放热或吸热）、气体放出（泡腾）或沉淀生成。反应总有新物质生成。
In contrast, physical changes—such as dissolving salt in water, changing state, or stretching a rubber band—do not create new substances. The key difference is whether the chemical bonds are broken and formed.
而物理变化——例如将盐溶于水、物态变化或拉伸橡皮筋——不会产生新物质。关键区别在于化学键是否断裂和生成。
To get ahead, practise writing word equations for the reactions you observe. For example: magnesium + oxygen → magnesium oxide. This skill will directly lead to symbol equations in Year 8.
要领先一步，请练习为观察到的反应书写文字表达式。例如：镁 + 氧气 → 氧化镁。这项技能将直接引向 Year 8 的符号方程式。
You also investigated examples like the reaction of an acid with a metal or carbonate, producing a salt + hydrogen or salt + CO₂ + water. Keep these patterns in mind.
你还探究过诸如酸与金属或碳酸盐反应的实例，生成盐 + 氢气或盐 + 二氧化碳 + 水。请记住这些反应模式。
7. Acids and Alkalis Basics | 酸与碱的基础
In Year 7, you used indicators such as litmus paper (red in acid, blue in alkali) and universal indicator to determine pH. You also neutralised an acid with an alkali to make a salt and water.
在 Year 7，你使用过石蕊试纸（酸中变红、碱中变蓝）和通用指示剂来测定 pH 值，并将酸与碱中和以生成盐和水。
Key vocabulary includes: acid, alkali, base, neutral, pH scale, neutralisation reaction. You should be comfortable explaining that the pH scale runs from 0 (strongly acidic) to 14 (strongly alkaline), with 7 being neutral.
关键词汇包括：酸、碱、碱性物质、中性、pH 标度、中和反应。你应该能自如地说明 pH 标度从 0（强酸性）到 14（强碱性），7
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