📚 Year 7 Cambridge Science: Complete Syllabus Breakdown | Year 7 剑桥科学：课程大纲全面解析
Cambridge Year 7 Science marks the exciting start of the Lower Secondary programme, setting the stage for deeper scientific thinking. Students explore three interconnected disciplines — biology, chemistry and physics — while developing hands-on enquiry skills. The course encourages curiosity about the natural world, introduces foundational scientific vocabulary, and builds confidence in using equipment such as microscopes, circuit kits and pH indicators.
剑桥 Year 7 科学是初中课程令人兴奋的开端，为深入的科学思维奠定基础。学生将探究生物学、化学和物理学这三个相互关联的学科，同时培养动手探究技能。课程鼓励对自然界的好奇心，引入基础科学词汇，并建立使用显微镜、电路组件和 pH 指示剂等器材的信心。
1. Curriculum Overview | 课程概览
The Cambridge Lower Secondary Science Stage 7 framework is organised into three strands: Biology, Chemistry and Physics. Within each strand, students learn through a mix of core knowledge and scientific enquiry. Enquiry skills — such as planning investigations, recording data, drawing graphs and evaluating evidence — are woven into every topic. The curriculum aligns with the Cambridge Lower Secondary Checkpoint at the end of Stage 9, but Year 7 itself offers frequent formative assessments and practical tasks to track progress.
剑桥初中科学第七阶段的框架分为三个领域：生物学、化学和物理学。在每个领域中，学生通过核心知识和科学探究相结合的方式来学习。探究技能——如规划调查、记录数据、绘制图表和评估证据——贯穿每个主题。该课程与第 9 阶段末的剑桥初中 Checkpoint 考试接轨，但 Year 7 本身提供频繁的形成性评估和实践任务来跟踪进度。
2. Biology 1: Cells and Organisms | 生物学1：细胞与生物体
Year 7 starts by examining the most basic unit of life: the cell. Students compare plant and animal cells under the microscope, identifying structures such as the nucleus, cytoplasm and cell membrane. They also learn that plant cells possess a rigid cell wall, a large permanent vacuole and chloroplasts for photosynthesis.
Year 7 从研究最基本的生命单位——细胞开始。学生用显微镜观察并比较植物和动物细胞，识别细胞核、细胞质和细胞膜等结构。他们还了解到植物细胞具有坚硬的细胞壁、一个大型的永久液泡以及进行光合作用的叶绿体。
| Feature | Plant Cell | Animal Cell |
|---|---|---|
| Cell wall | Present (cellulose) | Absent |
| Chloroplasts | Present | Absent |
| Vacuole | Large, permanent | Small, temporary |
| Shape | Often fixed, angular | Usually rounded, irregular |
上表总结了植物细胞与动物细胞的主要区别：细胞壁、叶绿体和大型液泡只存在于植物细胞。学生接着探索细胞是如何特化的。例如，红细胞的双凹形状和缺少细胞核有助于携带更多氧气，根毛细胞的突起增大了吸收表面积。
The next step is to understand how cells organise. Groups of similar cells form tissues, such as muscle tissue or xylem. Tissues work together to build organs like the heart or leaf. Organs then link into organ systems, such as the digestive or circulatory system. This hierarchy — cells → tissues → organs → organ systems — is a key concept that underpins all later biology topics.
下一步是理解细胞是如何组织的。相似的细胞群形成组织，如肌肉组织或木质部。组织共同构成器官，如心脏或叶片。然后器官连接成器官系统，如消化系统或循环系统。这个层级——细胞→组织→器官→器官系统——是支撑所有后续生物学课题的关键概念。
3. Biology 2: Human Body Systems | 生物学2：人体系统
Learners study the major organ systems that keep humans alive. The digestive system is a highlight: they follow food from the mouth, through the oesophagus, stomach and small intestine, learning how enzymes and acid break down large molecules into absorbable nutrients. The circulatory system transports these nutrients, along with oxygen and carbon dioxide, via the heart and blood vessels.
学生学习维持人体生命的主要器官系统。消化系统是重点：他们追随食物从口腔，经食道、胃、小肠，学习酶和酸如何将大分子分解成可吸收的营养物质。循环系统通过心脏和血管运输这些营养物质以及氧气和二氧化碳。
The respiratory system is explored through the mechanics of breathing — the diaphragm and intercostal muscles change the volume of the thorax to inhale and exhale. The skeletal and muscular systems are presented as partners in movement, with joints, antagonistic muscle pairs and the protective role of bones. The emphasis is always on linking structure to function, so students appreciate why each organ is shaped and positioned as it is.
呼吸系统通过呼吸力学来探讨——膈肌和肋间肌改变胸腔容积以完成吸气和呼气。骨骼系统和肌肉系统被介绍为运动中的伙伴，涉及关节、拮抗肌对以及骨骼的保护作用。重点始终在于将结构与功能联系起来，因此学生能理解每个器官为何具有其特定的形态和位置。
4. Biology 3: Plants and Ecosystems | 生物学3：植物与生态系统
Moving beyond humans, Year 7 covers plant nutrition and reproduction. Photosynthesis is introduced with the word equation:
超越人类，Year 7 还涵盖植物营养和繁殖。光合作用用文字方程式引入：
carbon dioxide + water → glucose + oxygen
二氧化碳 + 水 → 葡萄糖 + 氧气
Students learn that chlorophyll in chloroplasts captures light energy, converting it into chemical energy stored in glucose. Mineral salts, such as nitrates and magnesium, are essential for healthy growth, and their roles are linked to the formation of proteins and chlorophyll.
学生了解到叶绿体中的叶绿素捕获光能，将其转化为储存在葡萄糖中的化学能。矿物盐（如硝酸盐和镁）对健康生长至关重要，它们的作用与蛋白质和叶绿素的形成相关联。
Plant reproduction covers the parts of a flower — stamen, carpel, petals, sepals — and the processes of pollination, fertilisation and seed dispersal. On a larger scale, ecosystems come into focus. Pupils construct food chains and food webs, identify producers, consumers and decomposers, and discuss how energy flows through an ecosystem. Terms like habitat, population and community are defined, and students explore how changes in one species can ripple through an entire web.
植物繁殖涵盖花的各部分——雄蕊、雌蕊、花瓣、萼片——以及传粉、受精和种子传播的过程。在更大的尺度上，生态系统成为焦点。学生构建食物链和食物网，识别生产者、消费者和分解者，并讨论能量如何在生态系统中流动。栖息地、种群和群落等术语被定义，学生探索一个物种的变化如何波及整个网络。
5. Chemistry 1: Particle Theory and States of Matter | 化学1：粒子理论与物质状态
Chemistry begins with the idea that everything is made of tiny particles. The particle model explains the three states of matter: solids have particles packed tightly in a fixed regular arrangement, vibrating in place; liquids have particles close together but able to slide past one another; gases have particles far apart, moving rapidly in all directions.
化学以万物皆由微小粒子组成的概念开始。粒子模型解释了物质的三种状态：固体中的粒子紧密排列在固定的规则结构中，在位置上振动；液体中的粒子紧密但能相互滑动；气体中的粒子相距很远，向各个方向快速运动。
Changes of state — melting, freezing, boiling, condensation and sublimation — are explained in terms of energy transfer. During melting or boiling, energy is absorbed to overcome attractive forces between particles, while in freezing or condensation, energy is released. The persistence of temperature during a state change is linked to the latent heat concept without using the term explicitly at this stage. Students also connect particle motion to gas pressure, understanding that heating a sealed container makes gas particles collide more frequently and with greater force.
状态变化——熔化、凝固、沸腾、凝结和升华——用能量转移来解释。在熔化或沸腾过程中，能量被吸收以克服粒子间的吸引力，而在凝固或凝结时，能量被释放。状态变化期间温度保持不变的现象在此阶段已关联到潜热概念，但不必明确使用该术语。学生还将粒子运动与气体压强联系起来，理解加热密封容器会使气体粒子碰撞更频繁，力度更大。
6. Chemistry 2: Atoms, Elements and Compounds | 化学2：原子、元素与化合物
Students are introduced to the idea that each element is made of one type of atom. They learn the chemical symbols of the first 20 elements and understand that the Periodic Table arranges elements in order of increasing proton number. They distinguish between atoms of elements like Fe for iron, O for oxygen and Na for sodium.
学生被引入这样的概念：每种元素由一种原子构成。他们学习前 20 号元素的化学符号，并理解元素周期表按质子数递增的顺序排列元素。他们区分各种元素的原子，如 Fe 代表铁，O 代表氧，Na 代表钠。
Compounds are formed when two or more different elements chemically combine. For example, carbon and oxygen react to form carbon dioxide, which has very different properties from the elements alone. Mixtures, on the other hand, involve substances that are not chemically joined — like soil or sea water — and can be separated by physical methods such as filtration, evaporation or distillation. The key skill is writing simple word equations for elemental combinations, such as:
当两种或更多不同元素发生化学结合时就形成了化合物。例如，碳和氧反应生成二氧化碳，其性质与单独的元素截然不同。另一方面，混合物包含的物质没有发生化学结合——如土壤或海水——可通过过滤、蒸发或蒸馏等物理方法分离。关键技能是书写元素结合的简单文字方程式，例如：
magnesium + oxygen → magnesium oxide
镁 + 氧气 → 氧化镁
7. Chemistry 3: Physical and Chemical Changes, Acids and Alkalis | 化学3：物理与化学变化、酸与碱
The distinction between physical and chemical changes is cemented. A physical change, like melting ice, is reversible and no new substance forms; a chemical change, such as burning wood, produces new substances and is often irreversible. Evidence of a chemical reaction may include a colour change, temperature change, gas production or formation of a precipitate.
巩固了物理变化和化学变化的区别。物理变化，如冰融化，是可逆的，且没有新物质生成；化学变化，如木材燃烧，产生新物质且通常是不可逆的。化学反应的证据可能包括颜色变化、温度变化、产生气体或生成沉淀。
Acids and alkalis are introduced through the pH scale, which runs from 0 (strongly acidic) to 14 (strongly alkaline), with 7 being neutral. Students use universal indicator or litmus paper to test household substances like vinegar, lemon juice, soap and baking soda. Neutralisation is a key reaction: when an acid and an alkali mix, they produce a salt and water. This can be written as a general word equation:
酸和碱通过 pH 标度引入，范围从 0（强酸性）到 14（强碱性），7 为中性。学生使用通用指示剂或石蕊试纸测试家庭物品，如醋、柠檬汁、肥皂和小苏打。中和反应是一个关键反应：当酸和碱混合时，生成盐和水。这可以写成一般文字方程式：
acid + alkali → salt + water
酸 + 碱 → 盐 + 水
Common examples like hydrochloric acid neutralising sodium hydroxide to form sodium chloride and water are explored, linking chemistry to everyday contexts such as indigestion remedies and treating acidic soil.
常见例子如盐酸中和氢氧化钠生成氯化钠和水被探讨，将化学与日常生活联系起来，例如消化不良的药物和酸性土壤的处理。
8. Physics 1: Forces and Motion | 物理1：力与运动
Physics introduces forces as pushes or pulls that can change an object’s speed, direction or shape. Students classify forces into contact forces (friction, air resistance, tension) and non-contact forces (gravity, magnetism, electrostatic). They draw force arrows on diagrams, learning to represent magnitude and direction accurately.
物理学介绍力是能改变物体速度、方向或形状的推或拉。学生将力分为接触力（摩擦力、空气阻力、张力）和非接触力（重力、磁力、静电力）。他们在图示上画力的箭头，学习准确表示力的大小和方向。
The concept of balanced and unbalanced forces is critical — an object at rest or moving at constant velocity has balanced forces, while an unbalanced force causes acceleration. Friction is examined as both helpful (walking, braking) and unwanted (engine wear), with ways to reduce it, like lubrication and streamlining. Students also calculate average speed using the relationship:
平衡力和非平衡力的概念至关重要——静止或匀速直线运动的物体受到的力是平衡的，而非平衡力导致加速。摩擦既被看作有益的（行走、刹车）又是不利的（发动机磨损），并探讨减少摩擦的方法，如润滑和流线型设计。学生还使用以下关系计算平均速度：
average speed = total distance / total time
平均速度 = 总路程 / 总时间
They solve simple problems involving different units, such as m/s or km/h, and develop the ability to interpret distance–time graphs.
他们解决涉及不同单位（如米/秒或千米/小时）的简单问题，并培养解读距离–时间图的能力。
9. Physics 2: Energy and Electricity | 物理2：能量与电
Energy is introduced as the ability to do work, existing in various forms: kinetic, thermal, sound, light, electrical, elastic (strain) and gravitational potential. Students learn that energy is conserved — it cannot be created or destroyed, only transferred or transformed. They trace energy transfers in common devices, such as a lamp converting electrical energy into light and heat.
能量被介绍为做功的能力，以各种形式存在：动能、热能、声能、光能、电能、弹性（应变）能和重力势能。学生学习能量是守恒的——它不能被创造或销毁，只能被转移或转换。他们追踪常见设备中的能量转移，例如灯将电能转化为光和热。
Electricity lessons begin with simple circuits. Students construct series and parallel circuits, measure current with an ammeter and voltage with a voltmeter, and discover how current behaves at junctions. They learn that current is the flow of electric charge, and voltage is the ‘push’ driving the charge. Conductors and insulators are identified, and safety rules — like never using mains sockets for investigations — are stressed. The practical use of circuit symbols (cell, battery, switch, lamp, resistor, voltmeter, ammeter) allows them to draw clear circuit diagrams.
电的课程从简单电路开始。学生构建串联和并联电路，用电流表测电流，用电压表测电压，并发现电流在节点处的行为。他们学习电流是电荷的流动，电压是驱动电荷的“推力”。识别导体和绝缘体，并强调安全规则——例如绝不使用插座进行实验。电路符号（电池、电池组、开关、灯泡、电阻器、电压表、电流表）的使用使他们能够绘制清晰的电路图。
10. Physics 3: Magnetism, Waves and Earth Science | 物理3：磁学、波和地球科学
Magnetism focuses on permanent magnets, their poles and the magnetic field patterns around bar magnets. Students investigate attraction and repulsion, plot field lines using iron filings or plotting compasses, and learn that Earth itself behaves like a giant magnet. The idea of an electromagnet is introduced — a coil of wire (solenoid) around an iron core that becomes magnetic when current flows — and they explore factors that increase its strength.
磁学重点研究永磁体、磁极以及条形磁铁周围的磁场图案。学生探究吸引和排斥，用铁屑或小磁针描绘磁感线，并学习地球本身就像一个巨大的磁体。介绍了电磁铁的概念——一个缠绕在铁芯上的线圈（螺线管），当电流通过时变得具有磁性——并探究增强其磁力的因素。
Sound is treated as a vibration that travels as a longitudinal wave through a medium such as air, water or solids. Pupils connect frequency to pitch and amplitude to loudness. A simple experiment with a tuning fork and water shows that sound cannot travel through a vacuum. Light, by contrast, is a transverse wave that can travel through empty space. Year 7 covers reflection (using plane mirrors and the law i = r), refraction through transparent blocks, dispersion through a prism to produce a spectrum of colours, and how coloured filters work.
声音被视为通过空气、水或固体等介质传播的纵波。学生将频率与音调、振幅与响度联系起来。一个简单的音叉和水实验表明声音不能在真空中传播。相比之下，光是能穿过真空的横波。Year 7 涵盖反射（使用平面镜和定律入射角=反射角）、透明块中的折射、通过棱镜色散产生彩色光谱，以及彩色滤光片的工作原理。
Earth and space topics explore the causes of day and night (Earth’s rotation), the reasons for seasons (tilt of Earth’s axis in orbit), the phases of the Moon and a basic order of planets in the Solar System. Students discuss how models, like the heliocentric model, have changed over time.
地球和太空专题探讨了昼夜的成因（地球自转）、季节的原因（地球绕日公转时地轴的倾斜）、月相以及太阳系各行星的基本顺序。学生讨论如日心模型之类的模型如何随着时间推移而变化。
11. Assessment and Exam Tips | 评估与备考建议
Throughout Year 7, students are assessed through end-of-topic tests, practical skill checklists and longer investigative projects. In Cambridge schools, Progression Tests may be used to benchmark performance. The emphasis is on applying knowledge rather than just recalling facts. Common question styles include labelling diagrams, interpreting graphs,
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