📚 Year 7 AQA Chemistry: Bridging Guide to Secondary School | Year 7 AQA 化学：升学衔接指南
Starting secondary school is a big step, and science takes on a new level of excitement and depth. In Year 7 Chemistry, you will explore the building blocks of everything around us, from atoms and molecules to acids and the air we breathe. The AQA syllabus introduces key ideas through practical investigations and real-world examples, helping you develop scientific skills for GCSE and beyond. This bridging guide will help you understand what to expect, how to prepare, and how to succeed in your new chemistry lessons.
进入中学是重要的一步，科学课也会变得更加有趣而深入。在七年级化学中，你将探索构成万物的基本单元，从原子、分子到酸和呼吸的空气。AQA 教学大纲通过动手实验和实际生活中的例子介绍核心概念，帮助你培养科学技能，为 GCSE 和未来学习打下基础。这份衔接指南将帮助你了解即将学习的内容、如何准备，以及如何在化学课上取得好成绩。
1. Moving from Primary to Secondary Science | 从小学到中学科学的转变
In primary school, you learned about materials, states of matter, and simple changes like melting and freezing. Now science is split into biology, chemistry, and physics, with specialist teachers and laboratory work.
在小学，你学习了材料、物质的状态以及熔化和凝固等简单变化。现在，科学课分为生物、化学和物理，由专业教师在实验室授课。
You will wear safety goggles, use Bunsen burners, and carry out experiments that test your predictions. It's more hands-on, and you will write lab reports.
你会戴上护目镜，使用本生灯，并进行检验预测的实验。课堂变得更注重动手操作，你还要撰写实验报告。
The pace is faster, and you are expected to ask questions, think critically, and record observations carefully.
学习节奏更快，你要学会提问、批判性思考，并认真记录观察结果。
2. What is AQA Key Stage 3 Chemistry? | 什么是 AQA 关键阶段 3 化学？
AQA's Key Stage 3 (KS3) science programme covers Years 7 to 9, building a strong foundation for GCSE. The chemistry topics in Year 7 include the particle model, elements, compounds, mixtures, simple reactions, acids and alkalis, and Earth chemistry.
AQA 关键阶段 3（KS3）科学课程覆盖 7 至 9 年级，为 GCSE 打下坚实基础。七年级化学主题包括粒子模型、元素、化合物、混合物、简单反应、酸和碱以及地球化学。
You will not only learn facts but also 'Working Scientifically' skills such as planning investigations, analysing data, and evaluating evidence.
你不仅要学习知识，还要掌握 “科学工作” 技能，如设计探究实验、分析数据和评价证据。
The course is designed to spark curiosity – you will explore why metals rust, how to separate salt from sand, and what makes an acid fizzy.
课程旨在激发好奇心——你将探索金属为何生锈、如何从沙中分离食盐，以及酸为何会冒泡。
3. Safety in the Chemistry Lab | 化学实验室的安全
Safety is the number one priority in any science lesson. Before your first experiment, you will review the laboratory rules: never eat or drink, tie back long hair, and wear goggles when using chemicals or heating substances.
安全是所有科学课的第一要务。在第一次实验前，你会学习实验室规则：不准吃或喝、扎好长发、使用化学品或加热时要戴护目镜。
Learn the hazard symbols on chemical bottles – flammable, corrosive, irritant – and understand the risks. Always follow your teacher's instructions and report spills immediately.
熟悉化学品瓶上的危险符号——易燃、腐蚀性、刺激性——并了解其风险。务必遵循老师的指导，立即报告洒漏。
A Bunsen burner is a common tool; you will be shown how to light it safely, adjust the air hole to get a blue flame for heating, and never leave it unattended.
本生灯是常用工具；你将学习如何安全点燃，调节气孔获得用于加热的蓝色火焰，并且绝不让火源无人看管。
4. The Particle Model of Matter | 物质的粒子模型
All substances are made of tiny particles that are constantly moving. In solids, particles are packed closely in a fixed pattern and vibrate in place. In liquids, they are close but can slide past each other, taking the shape of the container. In gases, particles are far apart and move rapidly in all directions.
所有物质都由不断运动的微小粒子构成。固体中粒子紧密排列，有固定模式，只能在原位振动。液体中粒子靠近但可相互滑过，容器的形状即液体的形状。气体中粒子相距很远，向各个方向快速运动。
The particle model explains changes of state: melting, freezing, boiling, evaporation, condensation, and sublimation. For example, when ice melts, particles gain energy and break free from their fixed positions.
粒子模型可以解释状态变化：熔化、凝固、沸腾、蒸发、凝结和升华。例如，冰融化时，粒子获得能量，挣脱固定位置。
Remember, the particles themselves do not change – only their arrangement and energy. This helps you understand why mass is conserved during changes of state.
记住，粒子本身不变——只是排列方式和能量改变。这有助于你理解为何状态变化中质量守恒。
5. Elements, Compounds and Mixtures | 元素、化合物与混合物
An element is a pure substance made of only one type of atom. The periodic table lists all known elements – each has its own symbol, such as O for oxygen, Na for sodium, and Fe for iron.
元素是仅由一种原子组成的纯净物。元素周期表列出了所有已知元素——每种元素有自己的符号，如 O 表示氧，Na 表示钠，Fe 表示铁。
Compounds form when two or more different elements chemically join together. Water (H₂O) is a compound of hydrogen and oxygen. The properties of a compound are often very different from the elements that make it.
当两种或多种不同元素通过化学方式结合时，形成化合物。水（H₂O）是氢和氧的化合物。化合物的性质通常与构成它的元素有很大不同。
Mixtures contain two or more substances that are not chemically combined. You can often separate them using physical methods. Air is a mixture of gases; granite is a mixture of different minerals.
混合物含有两种或多种没有化学结合的物质。通常可以用物理方法将它们分离。空气是气体混合物；花岗岩是不同矿物的混合物。
6. Introduction to Chemical Reactions | 化学反应入门
A chemical reaction happens when new substances are made. Signs include colour change, temperature change, gas produced (bubbles), or a precipitate (solid) forming. Unlike changes of state, chemical reactions are often difficult to reverse.
当生成新物质时，就发生了化学反应。迹象包括颜色变化、温度变化、产生气体（气泡）或生成沉淀（固体）。与状态变化不同，化学反应通常难以逆转。
magnesium + oxygen → magnesium oxide
We represent reactions using word equations. Reactants are on the left, products on the right. The arrow means 'react to form'. The total mass stays the same – this is the law of conservation of mass.
我们用文字方程式表示反应。反应物在左边，产物在右边。箭头表示“反应生成”。总质量保持不变——这就是质量守恒定律。
Combustion, or burning, is a reaction with oxygen releasing heat and light. Rusting of iron is a slow reaction with oxygen and water. You can test for oxygen using a glowing splint – it relights.
燃烧是与氧气反应并释放热和光的过程。铁的生锈是铁与氧气和水的缓慢反应。你可以用带火星的木条检验氧气——会重新燃烧。
Acids react with metals to produce salt and hydrogen gas. You can test hydrogen with a lit splint – it makes a 'squeaky pop'.
酸与金属反应生成盐和氢气。你可以用点燃的木条检验氢气——会发出“噗”的爆鸣声。
7. Acids and Alkalis | 酸与碱
Acids are substances with a sour taste (but never taste in the lab!) and a pH less than 7. Common acids include hydrochloric acid (stomach acid), citric acid (in lemons), and sulfuric acid. Alkalis are bases that dissolve in water; they have a pH greater than 7 and feel soapy.
酸是具有酸味（但绝不能在实验室品尝！）、pH 小于 7 的物质。常见的酸有盐酸（胃酸）、柠檬酸（柠檬中）和硫酸。碱是可溶于水的碱性物质，pH 大于 7，手感滑腻。
The pH scale runs from 0 (strongly acidic) to 14 (strongly alkaline), with 7 being neutral. You can use universal indicator or litmus paper to measure pH. Universal indicator turns red in acid, green in neutral, and purple in strong alkali.
pH 范围从 0（强酸性）到 14（强碱性），7 为中性。你可以用通用指示剂或石蕊试纸测量 pH。通用指示剂在酸中变红，中性变绿，强碱中变紫。
hydrochloric acid + sodium hydroxide → sodium chloride + water
A neutralisation reaction occurs when an acid and an alkali are mixed, producing salt and water. This is useful in treating indigestion and in farming to adjust soil pH.
酸和碱混合时发生中和反应，生成盐和水。这在治疗消化不良和农业调节土壤 pH 方面很有用。
8. Separating Mixtures | 分离混合物
Chemists use different techniques to separate mixtures based on physical properties. Filtration separates an insoluble solid from a liquid, like sand from water. The solid left on the filter paper is called the residue, and the liquid that passes through is the filtrate.
化学家根据物理性质用不同技术分离混合物。过滤将不溶性固体与液体分离，如从水中分离沙子。留在滤纸上的固体叫残渣，透过的液体叫滤液。
Evaporation and crystallisation are used to obtain a soluble solid from a solution. Heating a salt solution causes water to evaporate, leaving salt crystals behind. Slow crystallisation can produce larger, purer crystals.
蒸发和结晶用于从溶液中获取可溶性固体。加热盐水使水蒸发，留下盐的晶体。缓慢结晶可以生成更大、更纯的晶体。
Distillation separates a liquid from a mixture by boiling and condensing. Simple distillation can collect pure water from ink or salt water. Chromatography separates dissolved colours, such as in food dyes or inks, based on how quickly they
Published by TutorHao | Year 7 Chemistry Revision Series | aleveler.com
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