📚 GCSE Science: End-of-Term Revision Checklist | GCSE 科学：期末复习提纲
As the end of term approaches, a structured revision checklist can transform scattered knowledge into exam-ready confidence. This guide covers the essential concepts from Biology, Chemistry, and Physics that every GCSE Science student must master, organised into twelve clear topics with key definitions, equations, and comparisons.
随着学期接近尾声，一份系统的复习提纲可以帮助你将零散的知识转化为应考信心。本指南涵盖了 GCSE 科学中生物学、化学和物理学每个学生必须掌握的核心概念，按十二个清晰的主题进行编排，提供关键定义、方程式和对比。
1. Scientific Enquiry and Methods | 科学探究与方法
All GCSE sciences rely on a common investigative framework. You should be able to plan experiments by identifying independent, dependent, and control variables. A fair test is one in which only the independent variable is changed and all other conditions are kept the same.
GCSE 科学各科都建立在统一的探究框架之上。你应能够通过确定自变量、因变量和控制变量来设计实验。所谓公平实验是指只有自变量发生变化，其他所有条件均保持一致。
Data can be presented in tables and graphs; always label axes with quantities and units. When interpreting results, distinguish between precision (how close repeated measurements are to each other) and accuracy (how close a measurement is to the true value). Anomalous results that do not fit the pattern should be identified and, where appropriate, excluded.
数据可以用表格和图形呈现；务必给坐标轴标注物理量和单位。在解读结果时，要区分精密度（重复测量值之间相互接近的程度）和准确度（测量值与真实值的接近程度）。不符合整体趋势的异常数据应被识别出来，并在适当情况下予以剔除。
You must also know how to carry out common practical techniques such as using a microscope, preparing a slide, performing a titration, measuring the rate of a reaction, and setting up circuits with ammeters and voltmeters correctly.
你还必须了解常见的实验操作技术，如使用显微镜、制作玻片、进行滴定、测量反应速率，以及正确连接包含电流表和电压表的电路。
2. Cells and Organisation | 细胞与组织
Living organisms are built from cells, the basic structural and functional units of life. Plant and animal cells share common features such as a nucleus, cytoplasm, cell membrane, mitochondria, and ribosomes. Plant cells possess additional structures: a cellulose cell wall, a permanent vacuole filled with cell sap, and chloroplasts that absorb light for photosynthesis.
生物体由细胞构成，细胞是生命的基本结构和功能单位。植物细胞和动物细胞都拥有细胞核、细胞质、细胞膜、线粒体和核糖体等共有结构。植物细胞还具有额外的结构：由纤维素构成的细胞壁、充满细胞液的大液泡，以及吸收光能进行光合作用的叶绿体。
| Feature | Animal Cell | Plant Cell |
|---|---|---|
| Nucleus | Present | Present |
| Cytoplasm | Present | Present |
| Cell membrane | Present | Present |
| Mitochondria | Present | Present |
| Cell wall | Absent | Present (cellulose) |
| Chloroplasts | Absent | Present in green parts |
| Permanent vacuole | Absent | Present |
Specialised cells, such as sperm cells, nerve cells, root hair cells, and xylem vessels, are adapted to perform specific functions. A group of similar cells working together forms a tissue; tissues form organs; organs make up organ systems like the digestive system or the circulatory system.
特化细胞，如精子细胞、神经细胞、根毛细胞和木质部导管，在结构上适应于特定的功能。一群相似且协同工作的细胞构成组织；组织构成器官；器官再组成器官系统，如消化系统或循环系统。
3. Transport and Body Systems | 运输与身体系统
In the circulatory system, blood transports oxygen, carbon dioxide, nutrients, hormones, and waste products. Red blood cells contain haemoglobin, which binds to oxygen in the lungs and releases it in tissues. The heart is a double pump: the right side pumps deoxygenated blood to the lungs, and the left side pumps oxygenated blood to the rest of the body.
在循环系统中，血液负责运输氧气、二氧化碳、营养物质、激素和代谢废物。红细胞含有血红蛋白，能在肺部结合氧气并在组织中释放氧气。心脏是一个双泵：右侧将缺氧血泵入肺部，左侧将富氧血泵至全身。
Plants have separate transport systems. Xylem vessels carry water and dissolved mineral ions from the roots upwards. Phloem tubes transport dissolved sugars produced during photosynthesis in both directions. Transpiration is the evaporation of water from leaves, driven by stomata; factors such as temperature, humidity, wind speed, and light intensity affect the transpiration rate.
植物有独立的运输系统。木质部导管将水分和溶解的矿物质离子由根部向上运输。韧皮部筛管则双向运输光合作用产生的溶解糖类。蒸腾作用是水分通过气孔从叶片蒸发的过程；温度、湿度、风速和光照强度等因素都会影响蒸腾速率。
4. Genetics and Evolution | 遗传与进化
DNA is a double-stranded polymer made up of nucleotides, and a gene is a section of DNA that codes for a particular protein. The entire set of genetic material in an organism is its genome. Genetic information is passed from parents to offspring through chromosomes in gametes (sperm and egg cells), which are haploid, containing half the usual number of chromosomes.
DNA 是由核苷酸组成的双链聚合物，基因则是编码特定蛋白质的一段 DNA。生物体中整套遗传物质称为基因组。遗传信息通过配子（精子和卵细胞）中的染色体从亲代传递给子代；配子是单倍体，含有正常染色体数目的一半。
Natural selection, proposed by Darwin, explains how species evolve. Organisms with advantageous traits are more likely to survive and reproduce, passing those traits to the next generation. Over many generations, the frequency of favourable alleles increases. Evidence for evolution comes from the fossil record, comparative anatomy, and DNA analysis.
达尔文提出的自然选择理论解释了物种进化的机制。具有有利性状的生物更有可能生存并繁殖，从而将此性状遗传给后代。经过多代，有利等位基因的频率逐渐增加。进化论的证据来自化石记录、比较解剖学和 DNA 分析。
5. Atomic Structure and the Periodic Table | 原子结构与周期表
All substances are made of atoms. An atom consists of a small, dense nucleus containing protons and neutrons, surrounded by electrons arranged in shells. The atomic number is the number of protons, which determines the element; the mass number is the total number of protons plus neutrons. Atoms are neutral overall because the number of electrons equals the number of protons.
所有物质都由原子组成。原子由一个致密的核（包含质子和中子）以及按壳层排布的电子构成。原子序数是质子数，决定了元素种类；质量数是质子数与中子数之和。由于电子数等于质子数，原子整体呈电中性。
Elements are arranged in the Periodic Table in order of increasing atomic number. Rows are called periods; the number of the period gives the number of occupied electron shells. Columns are called groups; elements in the same group have the same number of electrons in their outer shell and hence similar chemical properties. Group 1 metals (alkali metals) are highly reactive, Group 7 elements (halogens) are reactive non-metals, and Group 0 (noble gases) are unreactive due to full outer shells.
元素按照原子序数递增的顺序排列在周期表中。横行称为周期；周期编号等于该行元素占据的电子壳层数。纵列称为族；同族元素最外层电子数相同，因此化学性质相似。第 1 族金属（碱金属）非常活泼，第 7 族元素（卤素）是活泼的非金属，第 0 族（稀有气体）因最外层已满而几乎不反应。
6. Chemical Bonding and Structure | 化学键与物质结构
Atoms bond to achieve a full outer shell of electrons, often described as a stable noble gas configuration. There are three main types of strong chemical bond: ionic, covalent, and metallic. Ionic bonding occurs between metals and non-metals; electrons are transferred from the metal to the non-metal, forming oppositely charged ions held together by strong electrostatic forces. The resulting ionic compound forms a giant lattice with high melting and boiling points.
原子通过化学键达到满壳层电子结构，通常称为稳定的稀有气体构型。主要有三种强化学键：离子键、共价键和金属键。离子键发生在金属与非金属之间；电子从金属转移到非金属，形成带相反电荷的离子，由强静电吸引结合在一起。生成的离子化合物形成巨型晶格，具有高熔点和沸点。
Covalent bonding occurs between non-metal atoms, where pairs of electrons are shared. Simple molecular substances like O₂, H₂O, and CO₂ consist of small molecules with weak intermolecular forces, giving them low melting and boiling points. However, some covalently bonded substances, such as diamond, graphite, and silica (SiO₂), form giant covalent structures with very high melting points. In metallic bonding, metal atoms donate their outer electrons to form a ‘sea’ of delocalised electrons, which allows metals to conduct electricity and be malleable.
共价键发生在非金属原子之间，它们共享电子对。像 O₂、H₂O 和 CO₂ 这样的简单分子物质由小分子构成，分子间作用力很弱，因此熔点和沸点较低。然而，某些共价键物质，如金刚石、石墨和二氧化硅 (SiO₂)，形成巨型共价结构，熔点极高。在金属键中，金属原子贡献出外层电子，形成离域电子的“海洋”，这使得金属能够导电并具有延展性。
7. Chemical Reactions and Energy Changes | 化学反应与能量变化
A chemical reaction involves the rearrangement of atoms to form new substances. Reactants are consumed while products are formed. Reactions can be represented by word equations or balanced symbol equations, where the total number of atoms of each element is the same on both sides.
化学反应涉及原子的重新排列以生成新物质。反应物被消耗，同时生成产物。反应可以用文字方程式或配平的符号方程式表示，后者确保各元素在方程式两边的原子总数相等。
Energy changes accompany all reactions. In an exothermic reaction, energy is released to the surroundings, usually as heat, causing a temperature rise; combustion and neutralisation are examples. In an endothermic reaction, energy is absorbed from the surroundings, causing a temperature drop; thermal decomposition and photosynthesis are endothermic. Activation energy is the minimum energy colliding particles must have for a reaction to occur.
所有反应都伴随能量变化。在放热反应中，能量释放到周围环境中，通常以热能形式，导致温度升高；燃烧和中和反应即为例证。在吸热反应中，能量从周围环境吸收，导致温度下降；热分解和光合作用是吸热过程。活化能是碰撞粒子发生反应所需的最低能量。
8. Quantitative Chemistry | 定量化学
Relative atomic mass (Aᵣ) is the ratio of the average mass of an atom of an element to 1/12 the mass of a carbon-12 atom. Relative formula mass (Mᵣ) is the sum of the relative atomic masses of all atoms in the formula unit. In a balanced equation, the total Mᵣ of reactants equals the total Mᵣ of products.
相对原子质量 (Aᵣ) 是某种元素一个原子的平均质量与一个碳-12 原子质量的 1/12 的比值。相对式量 (Mᵣ) 是化学式单元中所有原子的相对原子质量之和。在配平的方程式中，反应物的总 Mᵣ 等于生成物的总 Mᵣ。
The mole is the unit for amount of substance. One mole of any substance contains 6.02 × 10²³ particles (Avogadro’s number). The mass of one mole of a substance is its Mᵣ in grams.
number of moles = mass (g) ÷ Mᵣ (g/mol)
摩尔是物质的量的单位。1 摩尔任何物质都含有 6.02 × 10²³ 个微粒（阿伏伽德罗数）。1 摩尔物质的质量即为其以克为单位的 Mᵣ 值。
物质的量 (mol) = 质量 (g) ÷ Mᵣ (g/mol)
Concentration of a solution is measured in mol/dm³ or g/dm³. You should be able to use titration results to calculate an unknown concentration.
concentration (mol/dm³) = number of moles ÷ volume (dm³)
溶液浓度的单位为 mol/dm³ 或 g/dm³。你应能利用滴定结果计算未知浓度。
浓度 (mol/dm³) = 物质的量 (mol) ÷ 体积 (dm³)
9. Energy and Power | 能量与功率
Energy can be stored in different forms: kinetic, gravitational potential, elastic potential, thermal (internal), chemical, nuclear, electrostatic, and magnetic. The principle of conservation of energy states that energy can be transferred usefully, stored, or dissipated, but it cannot be created or destroyed.
能量可以储存在不同形式中：动能、重力势能、弹性势能、热能（内能）、化学能、核能、静电势能和磁能。能量守恒原理指出：能量可以被有效转移、储存或耗散，但不能被创造或消灭。
kinetic energy Eₖ = ½ m v²
gravitational potential energy Eₚ = m g h
Power is the rate of energy transfer. One watt is one joule per second. Efficiency tells you how much of the input energy is usefully transferred; the rest is often dissipated as thermal energy to the surroundings.
power P = E ÷ t | efficiency = (useful output energy ÷ total input energy) × 100%
功率是能量转移的速率。1 瓦特等于 1 焦耳每秒。效率表示输入能量中有多少被有效转移；其余通常以热能形式耗散到环境中。
功率 P = E ÷ t | 效率 = (有用输出能量 ÷ 总输入能量) × 100%
10. Forces and Motion | 力与运动
A force is a push or pull that can change an object’s shape, speed, or direction. Forces are measured in newtons (N). When forces on an object are balanced, the object remains at rest or moves at a constant speed. If the forces are unbalanced, the object accelerates in the direction of the resultant force.
力是推或拉，可以改变物体的形状、速率或运动方向。力的单位是牛顿 (N)。当物体受力平衡时，物体保持静止或匀速直线运动。若受力不平衡，物体沿合力方向加速。
resultant force F = m × a | weight W = m × g
Motion can be described using speed-time and distance-time graphs. The gradient of a distance-time graph gives speed; the gradient of a speed-time graph gives acceleration; the area under a speed-time graph gives distance travelled. For an object moving in a circle at constant speed, the velocity is changing because direction changes, so there is an acceleration towards the centre (centripetal acceleration).
运动可以用速度-时间图和距离-时间图描述。距离-时间图的斜率表示速率；速度-时间图的斜率表示加速度；速度-时间图下的面积表示行驶距离。对于做匀速圆周运动的物体，速度大小不变但方向时刻改变，因此存在指向圆心的加速度（向心加速度）。
11. Waves | 波
Waves transfer energy without transferring matter. In transverse waves, such as light and water ripples, the oscillations are perpendicular to the direction of energy transfer. In longitudinal waves, such as sound, the oscillations are parallel to the direction of energy transfer. The wavelength (λ) is the distance between two consecutive crests or compressions; frequency (f) is the number of complete waves passing a point per second, measured in hertz (Hz).
波传递能量而不传递物质。在横波（如光波和水波）中，振动方向与能量传播方向垂直。在纵波（如声波）中，振动方向与能量传播方向平行。波长 (λ) 是两个相邻波峰或密部之间的距离；频率 (f) 是每秒通过某点的完整波的数量，单位为赫兹 (Hz)。
wave speed v = f × λ
The electromagnetic spectrum arranges electromagnetic waves by wavelength and frequency: radio, microwave, infrared, visible light, ultraviolet, X-ray, and gamma ray. All travel at the same speed in a vacuum (3.0 × 10⁸ m/s). Uses and hazards vary: radio for communication, microwaves for heating, infrared for remote controls, X-rays for medical imaging, gamma rays for cancer treatment and sterilisation, while ultraviolet can cause skin cancer and gamma rays are ionising.
电磁波谱按照波长和频率排列：无线电波、微波、红外线、可见光、紫外线、X 射线和伽马射线。它们在真空中传播的速度相同 (3.0 × 10⁸ m/s)。不同波段有不同的用途和危害：无线电波用于通讯，微波用于加热，红外线用于遥控，X 射线用于医学成像，伽马射线用于癌症治疗和灭菌，而紫外线可能导致皮肤癌，伽马射线具有电离作用。
12. Electricity and Magnetism | 电与磁
Electric current is the flow of electric charge. In metals, current is carried by moving electrons. For a charge Q flowing in time t,
I = Q ÷ t
Potential difference (voltage) measures the energy transferred per unit charge. Resistance is a measure of how difficult it is for current to pass through a component.
V = I × R
电流是电荷的定向运动。在金属中，电流由定向移动的电子形成。若在时间 t 内有电荷 Q 通过，
I = Q ÷ t
电压（电位差）衡量单位电荷转移的能量。电阻衡量电流通过某元件的难易程度。
V = I × R
In series circuits, current is the same everywhere; total resistance is the sum of individual resistances: Rₜₒₜₐₗ = R₁ + R₂ + … The supply voltage is shared across components. In parallel circuits, the voltage across each branch is the same as the supply voltage, and the total current is the sum of currents in each branch. More branches lower the total resistance.
在串联电路中，各处电流相等；总电阻等于各个电阻之和：Rₜₒₜₐₗ = R₁ + R₂ + …。电源电压在各元件间分配。在并联电路中，各支路两端电压相等且等于电源电压，总电流等于各支路电流之和。支路越多，总电阻越小。
For magnetism, like poles repel and unlike poles attract. An electromagnet is created by passing current through a coil of wire (solenoid); the magnetic field can be switched on and off. This principle is used in electric motors, generators, and transformers.
关于磁性，同名磁极相互排斥，异名磁极相互吸引。电磁铁是通过线圈（螺线管）中通过的电流产生的磁场；磁场可以接通和断开。这一原理应用于电动机、发电机和变压器。
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