📚 Year 7 SQA Chemistry: Summer Prep and Bridging Course | Year 7 SQA 化学：暑期预习与衔接课程
Welcome to the Year 7 SQA Chemistry summer bridging course! This article is designed to help you feel confident and prepared before you begin your secondary school chemistry journey in Scotland. We will explore the key topics you are likely to encounter in S1 science, from lab safety and states of matter to atoms, elements, and simple chemical reactions. Each section provides a clear explanation followed by a Chinese translation, making it easier for bilingual learners to grasp new concepts. Let's dive into the fascinating world of chemistry and build a strong foundation together.
欢迎来到 Year 7 SQA 化学暑期衔接课程！本文旨在帮助你在开始苏格兰中学化学学习之前建立信心、做好准备。我们将探讨 S1 科学中可能遇到的关键主题，从实验室安全、物质状态到原子、元素和简单的化学反应。每个部分都提供清晰的英文解释和对应的中文翻译，帮助双语学习者掌握新概念。让我们一起走进奇妙的化学世界，共同打下坚实的基础。
1. Welcome to Chemistry: Why Study Chemistry? | 欢迎学习化学：为什么学化学？
Chemistry is the study of matter—the stuff everything around us is made of. It explains how substances behave, change, and combine. From the food we eat to the medicines that keep us healthy, chemistry plays a vital role in everyday life. Even the screen you are reading this on exists thanks to chemical discoveries. Understanding chemistry helps you make sense of the world and opens doors to exciting careers in medicine, engineering, and environmental science.
化学是研究物质——即构成我们周围一切事物的材料——的科学。它解释物质如何表现、变化和组合。从我们吃的食物到维护健康的药物，化学在日常生活中起着至关重要的作用。甚至你正在阅读这篇文章的屏幕，也是化学发现的成果。理解化学能帮助你认识世界，并为医学、工程和环境科学等激动人心的职业打开大门。
In S1 Science under the Scottish Curriculum for Excellence, you will begin by exploring how to work safely in a laboratory, observe changes, and classify materials. You will not need any previous knowledge—just curiosity and a willingness to ask questions!
在苏格兰卓越课程下的 S1 科学中，你将首先学习如何安全地在实验室工作、观察变化以及对材料进行分类。你不需要任何预备知识——只需要好奇心和提问的意愿！
2. Safety First in the Lab | 实验室安全第一
Working in a chemistry lab is exciting, but safety must always come first. You will learn about hazard symbols that appear on chemical containers, such as flammable, corrosive, and irritant. Your teacher will show you how to use equipment like Bunsen burners and glassware safely. Always wear safety goggles to protect your eyes, tie back long hair, and never eat or drink in the lab.
在化学实验室工作令人兴奋，但安全必须永远放在首位。你将学习化学容器上出现的危险标志，如易燃、腐蚀性和刺激性标志。老师会教你如何安全使用本生灯和玻璃器皿等设备。始终佩戴护目镜保护眼睛，把长发扎起来，绝不在实验室吃东西或喝饮料。
If a spill happens, tell your teacher immediately rather than trying to clean it up yourself. Remember to wash your hands thoroughly after each practical activity. Following these simple rules will ensure that everyone enjoys a safe and productive learning environment.
如果发生溢出，立即告诉老师，而不是自己尝试清理。记得每次实践活动后彻底洗手。遵守这些简单规则能确保每个人都能享受安全且富有成效的学习环境。
3. States of Matter: Solids, Liquids and Gases | 物质的状态：固体、液体和气体
All substances around us exist in one of three states: solid, liquid, or gas. In solids, particles are packed tightly together in a fixed arrangement, so they have a definite shape and volume. Ice, a metal spoon, and a wooden block are solids. In liquids, particles are still close together but can move past each other, allowing the liquid to flow and take the shape of its container. Water and cooking oil are common examples.
我们周围的所有物质都以三种状态之一存在：固体、液体或气体。固体中，粒子紧密排列在固定的位置上，因此它们有确定的形状和体积。冰、金属勺子和木块都是固体。液体中，粒子仍然紧密接触，但可以相互滑动，使得液体能够流动并呈现容器的形状。水和食用油是常见的例子。
Gases have particles that are far apart and move rapidly in all directions. A gas will spread out to fill any container completely—think of the smell of baking bread travelling through the house. The particle model helps us visualise these differences: solids have the least energy, liquids have more, and gases have the most particle energy at the same temperature.
气体中的粒子相距很远并向各个方向快速运动。气体会扩散充满整个容器——想想烤面包的香味飘散全屋。粒子模型帮助我们形象化这些差异：相同温度下，固体粒子能量最低，液体较高，气体粒子能量最高。
4. Changes of State: Melting, Freezing, Boiling, Condensation | 状态变化：熔化、凝固、沸腾和冷凝
Substances can change from one state to another when they are heated or cooled. Melting is when a solid turns into a liquid, like ice melting into water at 0 °C. The reverse process, freezing, happens when a liquid becomes a solid, for example water turning into ice in a freezer. Boiling (or vaporisation) occurs when a liquid turns into a gas throughout its whole volume, and condensation is when a gas cools and changes back into a liquid, such as water droplets forming on a cold glass.
物质在被加热或冷却时会从一种状态变为另一种状态。熔化是固体变为液体，比如冰在 0 °C 融化成水。相反的过程——凝固，则发生在液体变为固体时，例如水在冷冻室里结成冰。沸腾（或汽化）发生在液体整体变成气体时，而冷凝是气体冷却变回液体，比如冷水杯外出现的水珠。
Sublimation is a special change where a solid turns directly into a gas without becoming a liquid first, as seen with dry ice (solid carbon dioxide). During any change of state, the mass of the substance stays the same because the number of particles does not change—only their arrangement and energy alter.
升华是一种特殊的变化，固体直接变为气体而不经过液态，例如干冰（固态二氧化碳）。在任何状态变化中，物质的质量保持不变，因为粒子的数量没有变化——只有它们的排列方式和能量发生了改变。
5. Physical and Chemical Changes | 物理变化与化学变化
In your S1 science lessons, you will learn to distinguish between physical changes and chemical changes. A physical change affects the form or appearance of a substance but does not produce a new substance. Examples include melting ice, tearing paper, or dissolving salt in water. These changes are usually easy to reverse.
在 S1 科学课上，你将学习区分物理变化和化学变化。物理变化影响物质的形式或外观，但不产生新物质。例子包括冰的融化、撕纸或将盐溶于水。这类变化通常容易逆转。
A chemical change, or chemical reaction, creates one or more new substances. Signs of a chemical reaction include a colour change, the formation of bubbles (a gas), the appearance of a solid from solutions (a precipitate), or a temperature change. Baking a cake, rusting iron, and burning wood are all chemical changes. Importantly, chemical changes are often difficult or impossible to undo.
化学变化，或称化学反应，会生成一种或多种新物质。化学反应的迹象包括颜色变化、气泡产生（气体）、溶液中出现固体（沉淀）或温度变化。烤蛋糕、铁生锈和木材燃烧都是化学变化。重要的是，化学变化通常很难或无法逆转。
6. Introduction to Atoms and Elements | 原子和元素入门
Everything in the universe is made of tiny particles called atoms. An element is a pure substance made up of only one type of atom. There are about 118 known elements, and each has a unique name and symbol. For example, oxygen is represented by O, carbon by C, and iron by Fe (from its Latin name 'ferrum'). You will not need to memorise all of them, but recognising common ones is very helpful.
宇宙万物都由称为原子的微小粒子组成。元素是由同一种原子组成的纯净物。目前已知大约有 118 种元素，每一种都有独特的名称和符号。例如，氧气用 O 表示，碳用 C，铁用 Fe（源于其拉丁名 'ferrum'）。你不需要全部背诵，但识别常用的符号会非常有帮助。
Atoms themselves are mostly empty space, with a tiny nucleus containing protons and neutrons at the centre, surrounded by moving electrons. In Year 7, you will likely begin by understanding that different atoms have different sizes and masses, and that this explains why element properties vary. For instance, gold atoms are much heavier than hydrogen atoms, making gold a dense, shiny metal while hydrogen is a light gas.
原子本身内部绝大部分是空的，中心有一个微小的原子核，内含质子和中子，周围环绕着运动的电子。在 Year 7，你可能会开始了解不同原子有不同的大小和质量，这解释了为什么元素的性质各不相同。例如，金原子比氢原子重得多，使金成为密度大、有光泽的金属，而氢则是一种轻质气体。
7. The Periodic Table: A Map of Elements | 元素周期表：元素的地图
The periodic table is a chart that organises all known elements in order of increasing atomic number. It is one of the most important tools in chemistry. Elements are arranged 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—though you may explore this pattern in more detail later.
元素周期表是一张按原子序数递增顺序排列所有已知元素的图表。它是化学中最重要的工具之一。元素排列成行称为周期，纵列称为族。同一族的元素具有相似的化学性质，因为它们的最外层电子数相同——不过你可能会在以后更详细地探究这个规律。
Metals are found on the left side and centre of the table, while non-metals are on the right. For a summer challenge, try to find the symbols for elements you encounter daily: sodium (Na) in salt, calcium (Ca) in milk, and aluminium (Al) in foil. Understanding that the table is a way of sorting elements will give you a great head start.
金属位于周期表的左侧和中间，而非金属位于右侧。作为暑期小挑战，试着找出你日常遇到的元素的符号：食盐中的钠 (Na)、牛奶中的钙 (Ca)、铝箔中的铝 (Al)。理解周期表是一种给元素分类的方法，会让你赢在起跑线上。
8. Compounds and Molecules | 化合物与分子
When two or more different elements join together chemically, they form a compound. A compound has completely different properties from the elements that make it up. For example, sodium (a reactive metal) and chlorine (a poisonous gas) combine to make sodium chloride—ordinary table salt, which is safe to eat. Water (H₂O) is a compound made from hydrogen and oxygen.
当两种或多种不同元素通过化学方式结合在一起，就形成了化合物。化合物的性质与组成它的元素完全不同。例如，钠（一种反应性很强的金属）和氯（一种有毒气体）结合成氯化钠——普通的食盐，它是安全的。水 (H₂O) 是由氢和氧组成的化合物。
A molecule is the smallest unit of a compound that can exist independently and still have the properties of that compound. Many compounds exist as molecules, like carbon dioxide (CO₂) and methane (CH₄). However, some compounds, such as salt, form giant structures of ions rather than separate molecules, so we usually just call them compounds. The key idea is that elements bond together in fixed ratios, shown by the small numbers (subscripts) in chemical formulas.
分子是化合物能独立存在并保持其性质的最小单元。许多化合物以分子形式存在，如二氧化碳 (CO₂) 和甲烷 (CH₄)。然而，有些化合物，比如食盐，形成巨大的离子结构而不是独立的分子，因此我们通常只称它们为化合物。核心概念是元素以固定比例结合，通过化学式中的小数字（下标）来表示。
9. Mixtures and Pure Substances | 混合物与纯净物
In chemistry, a pure substance contains only one type of particle—either a single element or a single compound. For instance, distilled water is pure because it consists only of H₂O molecules. In contrast, a mixture contains two or more different substances that are not chemically bonded. Air is a mixture of gases like nitrogen, oxygen, and carbon dioxide. Sea water is a mixture of water, salt, and other minerals.
在化学中，纯净物只含一种类型的粒子——要么是单质，要么是单一化合物。例如，蒸馏水是纯净的，因为它只含有 H₂O 分子。相比之下，混合物含有两种或多种不通过化学键结合的不同物质。空气是氮气、氧气和二氧化碳等气体的混合物。海水是水、盐和其他矿物质的混合物。
Mixtures can often be separated using physical techniques because the components keep their own properties. Filtration separates an insoluble solid from a liquid, such as sand from water. Evaporation or distillation can recover a dissolved solid, like salt from salty water. Chromatography can separate dyes. Learning these techniques in S1 will be very hands-on and fun.
混合物通常可以通过物理方法进行分离，因为各成分保持其自身性质。过滤能将不溶性固体与液体分开，比如沙子与水。蒸发或蒸馏可以回收溶解的固体，如从盐水中回收盐。色谱法可以分离染料。在 S1 学习这些技术将会非常动手实践而且有趣。
10. Simple Chemical Reactions: Acids and Bases | 简单化学反应：酸和碱
Acids and bases are two important groups of chemicals you will meet early on. Acids have a sour taste and include substances like vinegar (acetic acid) and citrus fruits (citric acid). Stronger laboratory acids, such as hydrochloric acid, must be handled with care. Bases are the chemical opposites; they feel soapy and include substances like sodium hydroxide and baking soda. Alkalis are soluble bases that release hydroxide ions (OH⁻) in water.
酸和碱是你早期会接触的两类重要化学物质。酸有酸味，包括醋（乙酸）和柑橘类水果（柠檬酸）等物质。较强的实验室酸，如盐酸，必须小心处理。碱是酸的化学对立面；它们摸起来有滑腻感，包括氢氧化钠和小苏打等物质。可溶性的碱称作碱溶液，在水中释放氢氧根离子 (OH⁻)。
When an acid and a base react, they neutralise each other to form a salt and water. This is called a neutralisation reaction. A familiar example is the reaction between hydrochloric acid and sodium hydroxide to give sodium chloride (table salt) and water. You might also observe reactions between acids and carbonates that fizz, producing carbon dioxide gas.
当酸与碱发生反应时，它们互相中和，生成盐和水。这称为中和反应。一个熟悉的例子是盐酸与氢氧化钠反应，产生氯化钠（食盐）和水。你可能还会观察到酸与碳酸盐反应产生气泡，生成二氧化碳气体。
11. Fun Summer Activities to Prepare | 暑期趣味预习活动
You do not need any special equipment to start thinking like a chemist this summer. Try observing changes in your kitchen: notice how baking powder causes cake batter to rise (a chemical change producing gas), or explore how salt dissolves faster in warm water than in cold water. These simple observations build scientific thinking skills.
这个夏天你不需要任何特殊设备就可以开始像化学家一样思考。尝试在厨房观察变化：注意泡打粉如何使蛋糕面糊膨胀（产生气体的化学变化），或者探索盐在温水中比在冷水中溶解得更快。这些简单的观察能培养科学思维技能。
You could also create a set of element flashcards using symbols and everyday uses. Learning the first 20 elements' names and symbols is a fantastic start. Another idea is to watch safe chemistry demonstration videos online (with a parent's permission) to see colourful reactions that will inspire your curiosity. Keep a journal to write down questions—scientists start with wondering 'why?'
你还可以制作一套元素卡片，写上符号和日常用途。记住前 20 种元素的名称和符号是一个非常棒的起点。另一个想法是在网上观看安全的化学演示视频（在家长允许下），看到多彩的反应会激发你的好奇心。准备一个日记本写下问题——科学家都是从问“为什么”开始的。
12. Bridging to Year 7 Chemistry | 衔接 Year 7 化学
Moving into secondary school chemistry can feel like a big step, but remember that your teacher will guide you through every experiment and concept. The topics covered in this bridging article—particles, states of matter, atoms, elements, compounds, and simple reactions—form the backbone of S1 chemistry. Re-reading the sections and practicing the key words will help you feel ready.
进入中学化学可能感觉像是一大步，但请记住，老师会引导你完成每一个实验和概念。这篇衔接文章涵盖的主题——粒子、物质状态、原子、元素、化合物和简单反应——构成了 S1 化学的主干。重读各部分并练习关键词会帮助你感觉准备就绪。
Do not worry about memorising everything at once. The most important skill is curiosity. When you see a candle burning or an ice cube melting, try to describe what is happening using the terms solid, liquid, gas, melting, or freezing. This summer, just enjoy exploring how chemistry is part of your daily life. You are now ready to begin an exciting journey of discovery in Year 7 SQA Chemistry!
不要担心一下子记住所有内容。最重要的技能是好奇心。当你看到蜡烛燃烧或冰块融化时，试着用固体、液体、气体、熔化或凝固这样的术语描述正在发生什么。这个夏天，只需享受探索化学如何成为你日常生活的一部分。现在你已经准备好了，可以在 Year 7 SQA 化学中开启一段激动人心的探索之旅！
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