Year 7 OCR Science: Summer Prep and Bridging Course | Year 7 OCR 科学：暑期预习与衔接课程

📚 Year 7 OCR Science: Summer Prep and Bridging Course | Year 7 OCR 科学：暑期预习与衔接课程

Moving from primary school into Year 7 is an exciting step, and science at Key Stage 3 becomes more structured and investigative. This summer bridging guide gives you a head start on the OCR syllabus, covering the big ideas you will explore in biology, chemistry and physics. Use it to build confidence and curiosity before term begins.

从小学升入七年级是令人兴奋的一步，而关键阶段三的科学课程变得更加结构化，也更注重探究。这份暑期衔接指南让你提前接触 OCR 教学大纲，涵盖你在生物、化学和物理中将探索的核心概念。在开学前用它来建立信心、激发好奇心吧。

1. Welcome to Key Stage 3 Science | 欢迎进入 KS3 科学

In Year 7 you will study science as a combined subject, rotating through topics in biology, chemistry and physics. The OCR course develops your practical skills and scientific thinking. You will learn how to plan experiments, record data and draw conclusions, all while discovering how the world works.

在七年级，你将把科学作为一门综合学科来学习，轮流学习生物、化学和物理专题。OCR 课程着重培养你的实践技能和科学思维。你将学习如何设计实验、记录数据、得出结论，并在此过程中了解世界的运行方式。

2. Scientific Enquiry and Lab Skills | 科学探究与实验技能

Every great scientist begins with curiosity. You will learn to ask testable questions, identify variables (independent, dependent and control), and write a clear method. Safety in the lab is always the first priority, so you will practise using equipment like Bunsen burners, thermometers and measuring cylinders safely.

每一位伟大的科学家都始于好奇心。你将学会提出可检验的问题，识别变量（自变量、因变量和控制变量），并写出清晰的实验步骤。实验室安全始终是第一要务，因此你将练习安全地使用本生灯、温度计、量筒等设备。

Recording results accurately in a table and spotting patterns is a key skill. Later, you will turn data into graphs, choosing the right type of chart and plotting points carefully. Drawing a line of best fit helps you see trends, and from those trends you can make predictions and evaluate how reliable your experiment was.

准确地将结果记录在表格中并发现规律是一项关键技能。之后，你会把数据转化为图表，选择合适的图表类型并仔细描点。画出最佳拟合线有助于观察趋势，根据趋势你可以做出预测，并评估实验的可靠程度。

3. Cells – The Building Blocks of Life | 细胞——生命的基本单位

All living organisms are made of cells. You will use a light microscope to look at plant and animal cells, learning to identify the nucleus, cytoplasm, cell membrane, mitochondria and ribosomes. Plant cells also have a rigid cell wall, a large permanent vacuole and chloroplasts for photosynthesis.

所有生物体都由细胞构成。你将使用光学显微镜观察植物和动物细胞，学会识别细胞核、细胞质、细胞膜、线粒体和核糖体。植物细胞还有坚固的细胞壁、一个中央大液泡以及进行光合作用的叶绿体。

You will discover how cells are organised: similar cells form tissues, tissues work together as organs, and organs are arranged into organ systems. For example, the respiratory system includes the lungs and trachea, working together to bring oxygen into the blood and remove carbon dioxide.

你将发现细胞是如何组织的：相似的细胞构成组织，组织协同工作形成器官，器官又组成器官系统。例如，呼吸系统包括肺和气管，它们共同作用，将氧气送入血液并排出二氧化碳。

4. States of Matter and the Particle Model | 物质的状态与粒子模型

Everything around you is made of tiny particles. The particle model explains why solids keep a fixed shape and volume, liquids can flow and take the shape of a container, and gases spread out to fill any space. In a solid, particles vibrate in fixed positions; in a liquid, they move around each other; in a gas, they move rapidly in all directions.

你周围的一切都是由微小的粒子构成的。粒子模型解释了为什么固体保持固定的形状和体积，液体可以流动并呈现容器的形状，而气体会扩散并充满任意空间。在固体中，粒子在固定位置上振动；在液体中，粒子相互滑动；在气体中，粒子向各个方向快速运动。

Changing state – melting, freezing, boiling, condensing and sublimating – can be understood through energy changes. When you heat a solid, particles gain energy and eventually break free into a liquid. The reverse happens when cooling removes energy. The mass stays the same during a change of state because the number of particles does not change.

状态变化——熔化、凝固、沸腾、凝结和升华——可以通过能量变化来理解。当你加热固体时，粒子获得能量，最终挣脱束缚变成液体。冷却带走能量时则发生相反的过程。在状态变化过程中质量保持不变，因为粒子的数量没有改变。

5. Atoms, Elements and the Periodic Table | 原子、元素与周期表

An element is a substance made of only one type of atom. All known elements are arranged in the Periodic Table, where they are sorted by increasing atomic number. Metals are found on the left and centre, while non-metals sit on the right. You will learn the chemical symbols for the first 20 elements, such as H for hydrogen, O for oxygen and Fe for iron.

元素是由同一种原子组成的物质。所有已知的元素都排列在周期表中，并按照原子序数递增的顺序排列。金属位于左侧和中部，非金属位于右侧。你将学习前 20 号元素的化学符号，例如 H 代表氢、O 代表氧、Fe 代表铁。

Atoms themselves contain smaller particles: protons and neutrons in the nucleus, with electrons orbiting in shells. The number of protons determines what element an atom is. For a neutral atom, the number of electrons equals the number of protons. Understanding this basic structure helps you see why elements react and bond.

原子本身还包含更小的粒子：原子核中的质子和中子，以及分层排布的电子。质子的数量决定了原子属于哪种元素。对于中性原子，电子数等于质子数。理解这种基本结构有助于你明白元素为何会发生反应和形成化学键。

6. Compounds and Chemical Reactions | 化合物与化学反应

When two or more different elements chemically combine, they form a compound. For example, hydrogen and oxygen react to make water (H₂O). Compounds have very different properties from the elements they are made from. A chemical reaction involves the rearrangement of atoms, and you can spot one by looking for signs like colour change, temperature change, gas bubbles or a precipitate forming.

当两种或多种不同元素通过化学方式结合时，就会形成化合物。例如，氢气和氧气反应生成水 (H₂O)。化合物的性质与其组成元素的性质截然不同。化学反应涉及原子的重新排列，你可以通过颜色变化、温度变化、产生气泡或生成沉淀等迹象来判断是否发生了反应。

Word equations and simple symbol equations help you describe what happens. In Year 7 you will mostly use word equations, writing the names of reactants on the left and products on the right, separated by an arrow. Conservation of mass means the total mass before and after a reaction stays the same.

文字表达式和简单的符号表达式能帮助你描述反应过程。在七年级，你主要使用文字表达式，将反应物名称写在左边，生成物写在右边，中间用箭头隔开。质量守恒意味着反应前后的总质量保持不变。

7. Forces and Motion | 力与运动

A force is a push or a pull, measured in newtons (N). Forces can change the speed, direction or shape of an object. Common forces include gravity, friction, air resistance, tension and upthrust. When forces on an object are balanced, it stays still or moves at constant speed; unbalanced forces cause acceleration or deceleration.

力是一种推或拉的作用，单位是牛顿 (N)。力可以改变物体的速度、方向或形状。常见的力包括重力、摩擦力、空气阻力、张力和浮力。当作用在物体上的力达到平衡时，物体会保持静止或匀速运动；不平衡的力则会导致加速或减速。

Hooke’s Law is introduced in the context of springs: the extension of a spring is directly proportional to the force applied, as long as the elastic limit is not exceeded. You will investigate this by hanging masses on a spring and plotting an extension–force graph. Speed is calculated as distance divided by time, and you will interpret distance–time graphs to describe journeys.

在弹簧的学习中会引入胡克定律：只要不超过弹性限度，弹簧的伸长量与所施加的力成正比。你将通过在弹簧上悬挂砝码并绘制伸长量—力的图像来探究这一点。速度的计算方法是距离除以时间，你还将学会解读距离—时间图像来描述运动过程。

8. Energy Types and Transfers | 能量类型与转化

Energy is needed to make things happen. It exists in many forms: kinetic, thermal, light, sound, electrical, chemical, gravitational potential and elastic potential. Energy can be transferred from one store to another or moved between objects, but it is never created or destroyed – this is the principle of conservation of energy.

要促成事物的发生就需要能量。能量以多种形式存在：动能、热能、光能、声能、电能、化学能、重力势能和弹性势能。能量可以从一种储存方式转移到另一种，或在物体之间传递，但它既不能被创造也不能被消灭——这就是能量守恒原理。

In Year 7 you will trace energy transfers in simple systems, such as a battery lighting a bulb (chemical → electrical → light + thermal). Sankey diagrams are a useful tool to show how much energy is transferred usefully and how much is wasted, usually as heat. Understanding energy helps you think about efficiency and renewable resources.

在七年级，你将追踪简单系统中的能量转化，例如电池点亮灯泡（化学能 → 电能 → 光能 + 热能）。桑基图是一种实用的工具，用来显示有多少能量被有效利用，又有多少被浪费（通常以热能形式）。理解能量能帮助你思考效率和可再生资源的问题。

9. Mixtures and Separation Techniques | 混合物与分离技术

Most materials around us are mixtures, containing two or more substances that are not chemically joined. Air is a mixture of gases, seawater is a mixture of water and dissolved salts. Because the components of a mixture keep their own properties, they can be separated by physical methods such as filtration, evaporation, distillation and chromatography.

我们周围的大多数材料都是混合物，含有两种或多种未通过化学方式结合的物质。空气是气体的混合物，海水是水和溶解盐的混合物。由于混合物中各组分保留了自身的性质，因此可以通过过滤、蒸发、蒸馏和色谱等物理方法进行分离。

Filtration separates an insoluble solid from a liquid, for example sand from water. Evaporation recovers a dissolved solid from a solution, while simple distillation collects the solvent as well. Chromatography is used to separate coloured substances, like the dyes in ink, and you will interpret chromatograms to identify unknown mixtures.

过滤用于分离不溶性固体和液体，例如将沙子从水中分离。蒸发可以从溶液中回收溶解的固体，而简单蒸馏则同时收集溶剂。色谱法用于分离有色物质，比如墨水中的染料，你还将学会解读色谱图以鉴定未知混合物。

10. Electricity and Circuits | 电与电路

Electric current is the flow of charge, carried by electrons through a conducting path. For a circuit to work, it must be complete and contain a source of energy (like a cell), wires and a load (such as a bulb or motor). You will learn to draw circuits using standard symbols and to build series and parallel circuits.

电流是电荷的流动，由电子在导电通路中携带。要使电路工作，电路必须是完整的，并且包含能量源（如电池）、导线和负载（如灯泡或电动机）。你将学习使用标准符号绘制电路图，并搭建串联和并联电路。

In a series circuit, components are connected one after another, so the current is the same everywhere. If one bulb breaks, the circuit is broken. In a parallel circuit, each component sits on its own branch, so the current splits and a fault in one branch does not stop the others. You will also measure current in amps using an ammeter and voltage in volts using a voltmeter.

在串联电路中，元件一个接一个地连接，因此各处的电流相等。如果一只灯泡坏了，整个电路就会断开。在并联电路中，每个元件都在自己的支路上，因此电流会分流，一条支路的故障不会影响其他支路。你还将学习用安培计测量电流（单位安培）和用伏特计测量电压（单位伏特）。

11. Ecosystems and Food Chains | 生态系统与食物链

An ecosystem is made up of living organisms and the non-living environment they interact with. All food chains start with a producer, usually a green plant that captures energy from the Sun through photosynthesis. Consumers eat other organisms: primary consumers eat plants, secondary consumers eat primary consumers, and predators sit at the top.

生态系统由生物体及其相互作用的非生物环境组成。所有食物链都始于生产者，通常是绿色植物，它们通过光合作用捕获来自太阳的能量。消费者以其他生物为食：初级消费者吃植物，次级消费者吃初级消费者，而捕食者位于顶端。

Decomposers like bacteria and fungi break down dead material, returning nutrients to the soil. You will learn to interpret food webs and understand that a change in one population affects others. Bioaccumulation of toxins can be explained by following a poison up through the food chain, showing why top predators are most at risk.

细菌和真菌等分解者分解死亡的有机体，将养分返回土壤。你将学习解读食物网，并理解一个种群的变化会如何影响其他种群。毒素的生物累积可以通过追踪毒物沿食物链向上传递来解释，这也说明了为什么顶级捕食者面临的风险最大。

12. Summer Revision and Bridging Tips | 暑期复习与衔接建议

Before starting Year 7, try some hands-on science at home: grow a plant from a seed and note the conditions it needs, or build a simple circuit with batteries and a bulb. Keep a science diary to jot down observations and questions. Watching nature documentaries or visiting a science museum can also spark ideas you will meet in class.

在开始七年级学习之前，尝试在家里做一些动手科学活动：用种子培育一株植物并记录它所需的条件，或者用电池和灯泡搭建一个简单的电路。准备一本科学日记，随时记下观察和疑问。观看自然纪录片或参观科学博物馆也能激发你在课堂中会遇到的想法。

Review the key words listed in each section of this guide – terms like ‘nucleus’, ‘force’, ‘element’ and ‘current’ will appear frequently. Write them on flashcards to test yourself. Most importantly, stay curious. Science is about asking why and how, and Year 7 is your chance to start finding answers for yourself.

复习本指南每一节中列出的关键词——“细胞核”“力”“元素”“电流”等术语会频繁出现。把它们写在闪卡上考考自己。最重要的是，保持好奇心。科学就是不断追问“为什么”和“怎么样”，而七年级正是你开始自己寻找答案的好时机。

Published by TutorHao | Science Revision Series | aleveler.com

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