📚 Year 7 WJEC Chemistry: Transition Guide | Year 7 WJEC 化学：升学衔接指南
Welcome to the exciting world of chemistry! Moving up to Year 7 is a big step, and this guide will help you understand what to expect from the WJEC Chemistry curriculum. We will cover key concepts, practical skills and useful tips to make your transition smooth and enjoyable.
欢迎来到化学的奇妙世界！升入七年级是重要的一步，本指南将帮助你了解 WJEC 化学课程的内容。我们会涵盖关键概念、实验技能和实用技巧，让你的衔接平稳又愉快。
1. What is Chemistry? | 什么是化学？
Chemistry is the study of substances, their properties, and how they change into new materials. It explains everyday phenomena, from baking a cake to rust forming on a bicycle.
化学是研究物质本身、它们的性质以及它们如何变成新材料的学科。它解释日常现象，从烤蛋糕到自行车生锈。
In Year 7, you will learn to think like a scientist by asking questions, making predictions and testing ideas through experiments.
在七年级，你将通过提出问题、作出预测和用实验验证想法来学习像科学家一样思考。
You will also discover that chemistry is not just in a lab – it is in the food we eat, the air we breathe and the products we use every day.
你还会发现化学不仅在实验室里——它存在于我们吃的食物、呼吸的空气和每天使用的产品中。
2. The WJEC Year 7 Chemistry Syllabus | WJEC 七年级化学大纲
The WJEC syllabus introduces fundamental ideas: particle theory, pure and impure substances, simple chemical reactions, and the properties of acids and alkalis.
WJEC 大纲引入基本概念：粒子理论、纯净物与不纯净物、简单的化学反应以及酸和碱的性质。
You will develop practical skills by carrying out investigations, recording observations and drawing conclusions from data.
你将通过开展探究、记录观察结果并从数据中得出结论来培养实验技能。
Assessment will include both written tests and practical tasks, so understanding the 'how' and the 'why' behind experiments is just as important as learning facts.
评估将包括书面测试和实验任务，因此理解实验背后的“如何”和“为什么”与学习事实同样重要。
3. States of Matter | 物质的状态
All matter is made of tiny particles. The way these particles are arranged and move determines whether a substance is solid, liquid or gas.
所有物质都由微小粒子组成。这些粒子的排列和运动方式决定了物质是固体、液体还是气体。
In solids, particles are packed closely in a fixed pattern and can only vibrate. In liquids, particles are close but can slide past each other. In gases, particles are far apart and move quickly in all directions.
在固体中，粒子紧密排列成固定模式，只能振动。在液体中，粒子彼此靠近但能相互滑动。在气体中，粒子相距很远并朝各个方向快速运动。
| State / 状态 | Particle arrangement / 粒子排列 | Movement / 运动 | Shape & volume / 形状与体积 |
|---|---|---|---|
| Solid / 固体 | Regular, very close / 规则，非常紧密 | Vibrate in place / 原地振动 | Fixed shape, fixed volume / 形状固定，体积固定 |
| Liquid / 液体 | Random, close / 无序，靠近 | Slide past each other / 相互滑动 | No fixed shape, fixed volume / 无固定形状，体积固定 |
| Gas / 气体 | Random, far apart / 无序，远离 | Move quickly in all directions / 快速向各个方向运动 | No fixed shape, no fixed volume / 无固定形状，无固定体积 |
Changing state – such as melting or boiling – involves adding or removing energy. The particles themselves do not change, only their arrangement and motion.
状态变化——如熔化或沸腾——涉及能量的增加或减少。粒子本身不变，改变的只是它们的排列和运动方式。
4. Atoms, Elements and Compounds | 原子、元素和化合物
An atom is the smallest building block of matter. Everything around you is made from atoms, which are far too small to see even with a strong microscope.
原子是物质最小的基本单元。你周围的一切都由原子构成，原子小到即使用高倍显微镜也无法看见。
An element is a substance made from only one type of atom. Examples include oxygen (O), hydrogen (H) and iron (Fe). The periodic table lists all known elements.
元素是由只有一种原子组成的物质。例如氧 (O)、氢 (H) 和铁 (Fe)。元素周期表列出了所有已知元素。
A compound forms when two or more different types of atom join together chemically. Water (H₂O) is a compound made from hydrogen and oxygen atoms bonded together.
当两种或多种不同原子以化学方式结合时，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。
In Year 7, you will learn to recognise the difference between elements and compounds by using chemical names and simple formulae, such as CO₂ and NaCl.
在七年级，你将学会通过化学名称和简单化学式（如 CO₂ 和 NaCl）来分辨元素和化合物的区别。
5. Understanding Chemical Reactions | 理解化学反应
A chemical reaction happens when starting substances, called reactants, are transformed into new substances, called products. This is different from a physical change, where no new substances are made.
当起始物质（反应物）转变为新物质（生成物）时，就发生了化学反应。这与物理变化不同，物理变化不产生新物质。
Signs of a chemical reaction include a colour change, gas production (bubbles), temperature change and the formation of a precipitate (a solid appearing in a liquid).
化学反应的迹象包括颜色变化、产生气体（气泡）、温度变化以及生成沉淀（液体中出现固体）。
Word equations summarise reactions without chemical symbols. For example, simple combustion can be written as:
文字表达式不使用化学符号来概括反应。例如，简单的燃烧可以写成：
methane + oxygen → carbon dioxide + water
During a reaction, atoms are rearranged, but no atoms are lost or made. This is the law of conservation of mass, a big idea you will meet often.
在反应过程中，原子重新排列，但没有原子消失或生成。这就是质量守恒定律，你将经常遇到这个重要概念。
6. Acids and Alkalis | 酸和碱
Acids are substances that release hydrogen ions in water. Common examples include hydrochloric acid (HCl) found in the stomach and citric acid in lemons.
酸是在水中释放出氢离子的物质。常见例子包括胃里的盐酸 (HCl) 和柠檬中的柠檬酸。
Alkalis are soluble bases that release hydroxide ions (OH⁻). Household examples include sodium hydroxide (NaOH) in oven cleaners and calcium hydroxide in lime water.
碱是可溶性的碱性物质，释放氢氧根离子 (OH⁻)。家用例子包括烤箱清洁剂中的氢氧化钠 (NaOH) 和石灰水中的氢氧化钙。
You will use indicators, such as litmus paper or universal indicator, to test whether a substance is acidic, neutral or alkaline. The pH scale, from 0 to 14, helps you compare the strength of acids and alkalis.
你将使用指示剂，如石蕊试纸或通用指示剂，来测试物质是酸性、中性还是碱性。pH 标度从 0 到 14，帮助你比较酸和碱的强弱。
7. Introduction to the Periodic Table | 元素周期表入门
The periodic table is a chart that organises all elements based on their atomic structure and properties. Each element is shown by its chemical symbol, such as C for carbon and Au for gold.
元素周期表是根据原子结构和性质将所有元素排列在一起的图表。每种元素都以其化学符号表示，例如碳的符号是 C，金的符号是 Au。
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.
元素排列成行（周期）和列（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。
In Year 7, you will become familiar with the first 20 elements and learn to locate metals and non-metals on the table. Metals are found on the left, while non-metals are on the right.
在七年级，你将熟悉前 20 种元素，并学会在周期表上找到金属和非金属。金属位于左边，非金属位于右边。
8. Practical and Investigation Skills | 实验与探究技能
Practical work is at the heart of chemistry. You will learn to use a Bunsen burner safely, measure liquid volumes with a measuring cylinder, and record temperature changes with a thermometer.
实验是化学的核心。你将学会安全使用本生灯、用量筒测量液体体积以及用温度计记录温度变化。
When designing an investigation, you need to identify independent, dependent and control variables. This helps you plan a fair test and produce reliable results.
在设计探究活动时，你需要确定自变量、因变量和控制变量。这有助于你设计公平的实验并获得可靠的结果。
You will also practise writing a clear method, presenting data in tables and graphs, and writing scientific conclusions that link back to your prediction.
你还将练习撰写清晰的实验步骤、用表格和图表展示数据，并写出与预测相关联的科学结论。
9. Working Safely in the Lab | 实验室安全操作
Safety is the most important rule in any science laboratory. Always wear safety goggles when handling chemicals or heating substances.
安全是所有科学实验室最重要的规则。在处理化学药品或加热物质时，务必佩戴护目镜。
You must know the hazard symbols for flammable, corrosive, toxic and irritant substances. Never taste chemicals, and always follow your teacher's instructions carefully.
你必须认识易燃、腐蚀性、有毒和刺激性物质的安全标志。绝不可品尝化学药品，并始终认真遵循老师的指导。
If an accident happens, such as a spill or a breakage, tell your teacher immediately. Keep your work area tidy and tie back long hair to avoid accidents.
如果发生事故，如溢出或打破器具，请立即告诉老师。保持工作区域整洁，并将长头发束起以避免意外。
10. Maths Skills for Chemistry | 化学所需的数学技能
Maths helps you handle data in chemistry. You will often calculate a mean from repeated measurements and round numbers to an appropriate degree of accuracy.
数学帮助你处理化学中的数据。你经常需要根据重复测量计算平均值，并将数值四舍五入到合适的精确度。
You will read scales on thermometers and measuring cylinders, interpret bar charts and line graphs, and sometimes calculate simple percentages, such as the percentage of oxygen in the air.
你将读取温度计和量筒上的刻度，解读条形图和折线图，有时还要计算简单的百分比，例如空气中的氧气含量。
Using correct units is essential. You will work with grams (g), centimetres cubed (cm³), degrees Celsius (°C) and seconds (s). Always write the number and unit together, e.g. 25 cm³.
使用正确的单位非常重要。你将使用克 (g)、立方厘米 (cm³)、摄氏度 (°C) 和秒 (s)。始终将数字和单位一起书写，例如 25 cm³。
11. Common Misconceptions to Avoid | 需要避免的常见误区
Misconception: Particles expand when heated. Actually, the particles themselves stay the same size; the spaces between them increase.
误区：加热时粒子会膨胀。实际上，粒子本身的大小不变，增大的是粒子间的距离。
Misconception: Boiling water produces bubbles of air. In fact, the bubbles are water vapour – water in the gaseous state.
误区：沸腾的水产生的是气泡。事实上，气泡是水蒸气，即气态的水。
Misconception: If an element is not on the periodic table, it does not exist. Everything in the universe is made from elements that do appear on the table, either alone or combined.
误区：如果一种元素不在周期表上，它就不存在。宇宙中的万物都由周期表上的元素构成，无论它们以单质还是化合形式存在。
Misconception: Acids always burn skin. While strong acids are dangerous, many weak acids, like those in fruit, are safe to eat. The hazard depends on concentration and strength.
误区：酸总是会灼伤皮肤。虽然强酸是危险的，但许多弱酸（如水果中的酸）可安全食用。危险性与浓度和强度有关。
12. How to Prepare for Success | 如何为成功做好准备
Review what you have already learned about materials in primary science. Think about solids, liquids and gases, and how you might test which materials are magnetic or dissolve in water.
复习你在小学科学中学过的有关材料的知识。回想固体、液体和气体，以及你如何测试哪些材料有磁性或能溶于水。
Create a simple glossary of new scientific words as you meet them, such as 'particle', 'reaction', 'acid' and 'periodic table'. Writing definitions in your own words helps your memory.
遇到新的科学词汇时，建立一个简单的术语表，比如“粒子”、“反应”、“酸”和“周期表”。用自己的话写定义有助于记忆。
Stay curious! Watch a science video, try a simple kitchen experiment or visit a science museum. The more you connect classroom ideas to real life, the more confident you will become.
保持好奇心！看一段科学视频，尝试一个简单的厨房实验，或参观科学博物馆。你越是将课堂知识与现实生活联系起来，就会变得越自信。
Published by TutorHao | Chemistry Revision Series | aleveler.com
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