IGCSE CCEA Science: End-of-Term Revision Guide | IGCSE CCEA 科学：期末复习提纲

📚 IGCSE CCEA Science: End-of-Term Revision Guide | IGCSE CCEA 科学：期末复习提纲

Preparing for the IGCSE CCEA Science end-of-term examination can feel overwhelming, but a well-structured revision plan makes all the difference. This guide breaks down the core topics across Biology, Chemistry, and Physics, highlighting the essential knowledge, practical skills, and exam techniques you need to secure top marks. Use it as a checklist to identify gaps, reinforce understanding, and build confidence ahead of the test.

备战 IGCSE CCEA 科学期末考试可能令人望而生畏，但一份清晰的复习提纲能让复习更有条理。本指南梳理了生物、化学与物理学科的核心主题，提炼出必备知识、实验技能与应试技巧，助你查漏补缺、巩固理解、自信迎考。

1. Cells and Organisation | 细胞与组织层次

Animal and Plant Cells: Both share a nucleus, cytoplasm, cell membrane, mitochondria and ribosomes, while plant cells also possess a cell wall, large permanent vacuole and chloroplasts. Knowing the function of each organelle is fundamental to understanding how organisms function.

动物与植物细胞：两者都包含细胞核、细胞质、细胞膜、线粒体和核糖体，而植物细胞还拥有细胞壁、大液泡和叶绿体。掌握各细胞器的功能是理解生物体运作的基础。

Specialised Cells and Organisation: Cells differentiate to perform specific roles, such as red blood cells transporting oxygen or root hair cells absorbing water. They are organised into tissues, organs and systems. In the human body, the digestive system exemplifies this hierarchy: epithelial tissue lines the stomach, which works with other organs to break down food.

细胞分化与组织层次：细胞通过分化承担特定功能，如红细胞运输氧气、根毛细胞吸收水分。这些细胞进而构成组织、器官与系统。人体消化系统便是典型：上皮组织覆盖胃壁，胃与其他器官协同完成食物分解。

Microscopy Calculations: Magnification = size of image ÷ actual size of specimen. Be comfortable converting between millimetres, micrometres and nanometres using standard form, as measurement questions regularly appear in CCEA papers.

显微镜计算：放大倍数 = 图像大小 ÷ 样本实际大小。务必熟练使用科学记数法进行毫米、微米与纳米的换算，因为测量类题目在 CCEA 试卷中频繁出现。

2. Biological Processes: Diffusion, Osmosis and Active Transport | 生物过程：扩散、渗透与主动转运

Diffusion: The net movement of particles from a region of higher concentration to a region of lower concentration, down the concentration gradient. It is a passive process requiring no energy and is responsible for gas exchange in the lungs.

扩散：粒子由高浓度区域向低浓度区域的净移动，沿浓度梯度进行。该过程无需能量，属于被动运输，肺部的气体交换即依赖扩散。

Osmosis: The movement of water molecules from a dilute solution to a more concentrated solution through a partially permeable membrane. Plant cells rely on osmosis to remain turgid, which provides structural support.

渗透：水分子通过半透膜从稀溶液向浓溶液移动的过程。植物细胞依赖渗透保持质硬挺立，从而获得结构支撑。

Active Transport: The movement of substances against the concentration gradient using energy from respiration. This process enables root hairs to absorb mineral ions even when soil concentrations are low.

主动转运：利用呼吸作用提供的能量，将物质逆浓度梯度运输。该过程使根毛细胞即使在土壤离子浓度较低时仍能吸收矿质离子。

Process	Energy Required?	Direction	Example
Diffusion 扩散	No	Down gradient	O₂ entering blood 氧气进入血液
Osmosis 渗透	No	Down water potential gradient	Water uptake by roots 根部吸水
Active Transport 主动转运	Yes (ATP)	Against gradient	Mineral ion uptake 矿质离子吸收

3. Biological Molecules and Enzymes | 生物分子与酶

Carbohydrates, Proteins and Lipids: Starch, glycogen and cellulose are polysaccharides made from glucose. Proteins are chains of amino acids folded into specific shapes. Lipids consist of three fatty acids joined to glycerol. The iodine test for starch, Benedict’s test for reducing sugars, Biuret test for protein and ethanol emulsion test for lipids must be memorised.

糖类、蛋白质与脂质：淀粉、糖原和纤维素是由葡萄糖构成的多糖。蛋白质是由氨基酸链折叠形成的特定结构。脂质则由三分子脂肪酸与一分子甘油结合而成。需牢记碘液检测淀粉、班氏试剂检测还原糖、双缩脲试剂检测蛋白质以及乙醇乳化法检测脂质的实验方法。

Enzyme Action: Enzymes are biological catalysts that lower activation energy. They have an active site complementary to a specific substrate, described by the lock-and-key model. Temperature and pH affect enzyme activity; denaturation occurs when the active site loses its shape permanently beyond the optimum conditions.

酶的作用：酶是能降低活化能的生物催化剂。其活性位点与特定底物互补，可用锁钥模型描述。温度和 pH 影响酶活性；当超过最适条件，活性位点永久变形，酶便失活。

Enzyme Investigations: Be able to plan an investigation into how temperature or pH affects enzyme activity, identifying independent, dependent and control variables. CCEA questions often require you to explain why certain controls are necessary, such as using a water bath to maintain temperature.

酶活性探究：需掌握如何设计探究温度或 pH 对酶活性影响的实验，并正确识别自变量、因变量与控制变量。CCEA 经常要求解释为何需要某些控制措施，例如使用水浴锅维持恒温。

4. Atomic Structure and Bonding | 原子结构与化学键

Subatomic Particles: Protons (relative mass 1, charge +1), neutrons (mass 1, charge 0) and electrons (mass 1/1840, charge –1). The atomic number defines the element, while the mass number equals the total number of protons and neutrons. Isotopes have the same number of protons but different numbers of neutrons.

亚原子粒子：质子（相对质量1，电荷+1）、中子（质量1，电荷0）与电子（质量1/1840，电荷–1）。原子序数决定元素种类，质量数等于质子数与中子数之和。同位素质子数相同，中子数不同。

Ionic Bonding: Metal atoms lose electrons to form positive cations, while non-metal atoms gain electrons to form negative anions. The strong electrostatic attraction between oppositely charged ions forms giant ionic lattices, giving ionic compounds high melting points and the ability to conduct electricity when molten or dissolved.

离子键：金属原子失去电子形成阳离子，非金属原子得到电子形成阴离子。带相反电荷的离子间强烈的静电引力构成巨大的离子晶格，使得离子化合物熔点高，且在熔融或溶解状态下能够导电。

Covalent Bonding: Non-metal atoms share pairs of electrons to achieve a full outer shell. Simple molecular substances like H₂O and CO₂ have low melting points and do not conduct electricity. Giant covalent structures such as diamond and silicon dioxide are extremely hard and have very high melting points.

共价键：非金属原子共用电子对以达到满壳层结构。水、二氧化碳等简单分子物质熔沸点较低、不导电。金刚石与二氧化硅等巨型共价结构则极为坚硬，熔点极高。

5. Chemical Reactions and Quantitative Chemistry | 化学反应与定量化学

Balancing Equations and State Symbols: Always check that the number of atoms of each element is equal on both sides. Use state symbols (s), (l), (g) and (aq) correctly. Example: 2Mg(s) + O₂(g) → 2MgO(s).

配平方程式与状态符号：务必确保每种元素在方程式两边的原子数相等，并正确使用状态符号 (s)、(l)、(g)、(aq)。例如：2Mg(s) + O₂(g) → 2MgO(s)。

Relative Formula Mass and the Mole: Relative formula mass (Mᵣ) is the sum of the relative atomic masses in a formula unit. One mole of a substance contains 6.02 × 10²³ particles and has a mass equal to its Mᵣ in grams. Use the equation: moles = mass ÷ Mᵣ.

相对式量与摩尔：相对式量(Mᵣ)是化学式中各原子相对原子质量的总和。1摩尔物质含有 6.02 × 10²³ 个微粒，其质量在数值上等于该物质的相对式量(g)。使用公式：物质的量(mol) = 质量(g) ÷ 相对式量。

Reacting Masses and Percentage Yield: Use balanced equations to calculate the theoretical mass of a product, then determine percentage yield = (actual yield ÷ theoretical yield) × 100%. Low yields can be due to incomplete reactions, side reactions or losses during purification.

反应质量与产率：利用配平的方程式计算产物的理论质量，再求产率：产率 = (实际产量 ÷ 理论产量) × 100%。产率偏低可能源于反应不完全、副反应发生或提纯过程中的损失。

6. Acids, Bases and Electrolysis | 酸、碱与电解

Acids and Alkalis: Acids release H⁺ ions in water; alkalis release OH⁻ ions. The pH scale measures acidity: pH 7 is neutral, lower values are acidic, higher values are alkaline. Neutralisation reactions produce a salt and water, e.g. HCl + NaOH → NaCl + H₂O.

酸与碱：酸在水中释放 H⁺ 离子，碱释放 OH⁻ 离子。pH 标度衡量酸碱度：pH 7 为中性，数值越低酸性越强，越高碱性越强。中和反应生成盐和水，如 HCl + NaOH → NaCl + H₂O。

Making Soluble Salts: React an acid with an insoluble base, metal or carbonate. For example, copper(II) sulfate can be prepared by reacting sulfuric acid with copper(II) oxide, then filtering, heating and crystallising.

制备可溶性盐：用酸与不溶性碱、金属或碳酸盐反应。例如，将硫酸与氧化铜反应可制得硫酸铜，随后过滤、加热并结晶。

Electrolysis: Ionic compounds conduct electricity when molten or in solution because the ions are free to move. During electrolysis of molten lead bromide, lead forms at the cathode (reduction) and bromine at the anode (oxidation). For aqueous solutions, the products depend on the reactivity of the ions and the presence of water.

电解：离子化合物在熔融或溶液中因离子可自由移动而导电。电解熔融溴化铅时，阴极生成铅（还原反应），阳极生成溴（氧化反应）。水溶液的电解产物则取决于离子的活泼性及水的参与。

7. Forces and Motion | 力与运动

Scalar and Vector Quantities: Scalars have magnitude only (e.g. speed, distance), while vectors have both magnitude and direction (e.g. velocity, displacement, force). Be prepared to draw and interpret vector diagrams.

标量与矢量：标量仅有大小（如速率、路程），矢量兼具大小和方向（如速度、位移、力）。需掌握矢量图的绘制与解读。

Motion Graphs: Distance-time graphs show speed as the gradient; a horizontal line indicates the object is stationary. Velocity-time graphs show acceleration as the gradient, and the area under the graph represents the distance travelled.

运动图像：路程-时间图像的斜率代表速率，水平线表示物体静止。速度-时间图像中，斜率为加速度，图线下面积代表移动的距离。

Equations of Motion: For uniform acceleration, memorise and apply:

v = u + at

s = ut + ½at²

v² = u² + 2as

运动学方程：针对匀加速直线运动，需掌握并应用下列公式：

末速度 = 初速度 + 加速度 × 时间

位移 = 初速度 × 时间 + ½ × 加速度 × 时间²

末速度² = 初速度² + 2 × 加速度 × 位移

Newton’s Laws: An object remains at rest or in uniform motion unless a resultant force acts. Force = mass × acceleration (F=ma). For every action there is an equal and opposite reaction. Use these principles to explain vehicle safety features and momentum changes.

牛顿定律：物体在不受外力作用时保持静止或匀速直线运动状态。力 = 质量 × 加速度 (F=ma)。每一个作用力都有一个大小相等、方向相反的反作用力。用这些原理解释汽车安全设计与动量变化。

8. Energy, Work and Power | 能量、功与功率

Forms and Transfers: Energy can be stored as kinetic, gravitational potential, thermal, chemical, elastic and nuclear. It is transferred by forces (mechanical work), electric currents (electrical work), heating and radiation. In any closed system, total energy is conserved.

能量形式与转移：能量可储存为动能、重力势能、热能、化学能、弹性势能和核能。它通过力（机械功）、电流（电功）、加热和辐射等方式转移。在任何封闭系统中，总能量守恒。

Calculations: Work done = force × distance moved in the direction of the force. Gravitational potential energy gained = mass × gravitational field strength × height. Kinetic energy = ½ × mass × speed². Power is the rate of doing work: Power = work done ÷ time.

Eₚ = mgh

Eₖ = ½mv²

P = W ÷ t

计算：功 = 力 × 沿力方向移动的距离。增加的重力势能 = 质量 × 重力场强度 × 高度。动能 = ½ × 质量 × 速度²。功率是做功的速率：功率 = 做功 ÷ 时间。

Efficiency: Efficiency = (useful energy output ÷ total energy input) × 100%. Sankey diagrams are a visual way to represent energy transfers and highlight wasted energy, often dissipated as thermal energy to the surroundings.

效率：效率 = (有用能量输出 ÷ 总能量输入) × 100%。桑基图能够直观展示能量转移路径，突显耗散到环境中的废热。

9. Waves and Electromagnetic Spectrum | 波与电磁波谱

Wave Properties: Amplitude, wavelength, frequency and wave speed. The wave equation links them: wave speed = frequency × wavelength (v = fλ). Transverse waves (e.g. light, water ripples) oscillate perpendicular to the direction of energy transfer, while longitudinal waves (e.g. sound) oscillate parallel.

波的基本性质：振幅、波长、频率与波速。波速方程：波速 = 频率 × 波长 (v = fλ)。横波（如光波、水波）振动方向与能量传播方向垂直，纵波（如声波）振动方向与传播方向平行。

Electromagnetic Spectrum: From longest wavelength to shortest: radio, microwave, infrared, visible, ultraviolet, X-ray, gamma. All travel at 3 × 10⁸ m/s in a vacuum. Each region has practical applications – radio waves in communication, X-rays in medical imaging, and gamma rays in cancer treatment – along with associated hazards.

电磁波谱：波长由长到短依次为：无线电波、微波、红外线、可见光、紫外线、X 射线、伽马射线。它们在真空中均以 3 × 10⁸ m/s 的速度传播。不同波段有各自的用途——无线电波用于通信，X 射线用于医学成像，伽马射线用于癌症治疗——同时也伴随相应的危害。

Reflection and Refraction: Know how to construct ray diagrams for plane mirrors. Refraction occurs when waves cross a boundary at an angle into a medium of different density, changing speed and direction. Snell’s law is not required at this level, but you should describe the bending toward or away from the normal.

反射与折射：需掌握平面镜成像的光路图绘制。当波以一定角度穿越不同密度的介质界面时会发生折射，波速和方向均发生改变。此阶段不涉及斯涅耳定律的计算，但应能描述光线靠近或偏离法线的弯折现象。

10. Practical Skills and Investigation Design | 实验技能与探究设计

Variables and Data Handling: Identify independent (change), dependent (measure) and control (keep the same) variables in any experiment. Record data in clear tables with correct headings and units. Plot line graphs accurately, draw best-fit lines, and be able to describe trends using scientific language.

变量与数据处理：在任何实验中准确识别自变量（改变）、因变量（测量）和控制变量（保持不变）。将数据记录在清晰的表格中，注明正确的项目名称与单位。精确绘制折线图，画出最佳拟合线，并能用科学语言描述变化趋势。

Common Apparatus: Thermometer (temperature), stopwatch (time), measuring cylinder (liquid volume), balance (mass), ammeter (current) and voltmeter (voltage). For CCEA, expect to describe how to use a microscope or set up a circuit safely.

常用器材：温度计（温度）、秒表（时间）、量筒（液体体积）、天平（质量）、电流表（电流）和电压表（电压）。CCEA 考试中常要求描述显微镜的安全使用或电路的正确搭建方法。

Risk Assessment: Always mention specific hazards (e.g. corrosive acid, hot surfaces) and control measures (e.g. wear goggles, use heat-proof mat). Full-mark answers link the precaution directly to the identified risk.

风险评估：始终明确指出具体危险（如腐蚀性酸液、高温表面），并提出相应的控制措施（如佩戴护目镜、使用隔热垫）。能得满分的答案需将防范措施与所识别的风险直接关联起来。

11. Electricity and Circuits | 电与电路

Current, Voltage and Resistance: Current (I) is the rate of flow of charge, measured in amperes (A). Voltage (V) is the energy transferred per unit charge, measured in volts (V). Resistance (R) opposes current, measured in ohms (Ω). Ohm’s Law relates them: V = I × R.

电流、电压与电阻：电流(I)是电荷流动的速率，单位为安培(A)。电压(V)是单位电荷所传递的能量，单位为伏特(V)。电阻(R)阻碍电流，单位为欧姆(Ω)。欧姆定律表明：V = I × R。

Series and Parallel Circuits: In series, current is the same at all points, voltage is shared and total resistance is the sum of individual resistances. In parallel, the total current splits among branches, voltage across each branch is the same, and total resistance decreases as more branches are added.

串联与并联电路：串联电路中电流处处相等，电压被各器件分压，总电阻等于各电阻之和。并联电路中干路电流分流至各支路，各支路两端电压相等，且并联支路越多，总电阻越小。

Electrical Safety: Fuses and circuit breakers prevent overheating by breaking the circuit when current exceeds a safe value. Double insulation and earthing protect users from electric shock. Be able to interpret standard domestic circuit symbols.

用电安全：熔丝与断路器能在电流超出安全值时切断电路，防止过热。双重绝缘与接地保护可防止使用者触电。应能识读标准的家庭电路符号图示。

12. Exam Technique and Final Checklist | 考试技巧与最终检查清单

Command Words: ‘State’ requires a brief answer, ‘Describe’ needs a detailed account of what happens, ‘Explain’ asks for scientific reasoning with cause and effect, and ‘Evaluate’ expects you to weigh benefits against drawbacks using evidence from the question.

指令词辨析：‘陈述’只需简短作答；’描述’需要详细叙述发生的过程；’解释’要求用因果推理给出科学依据；’评价’则要根据题目信息权衡利弊。

Common Pitfalls: Avoid omitting units, misreading the scale on graphs, forgetting to convert units to standard form, and writing vague statements instead of using precise terminology. When calculations are involved, show all steps – marks are awarded for method even if the final answer is wrong.

常见失分点：切忌遗漏单位、读错坐标轴刻度、忘记换算为科学记数法、以及用模糊表述取代精确术语。涉及计算时，务必展示全部推导过程——即使最终答案有误，CRO（解题过程）仍有得分可能。

Revision Action Plan: Review summary notes, complete past paper questions under timed conditions, and use mark schemes to self-assess. Focus extra time on topics you find most challenging, and practice drawing diagrams (circuits, ray paths, apparatus set-ups) until you can reproduce them confidently from memory.

复习行动方案：重温总结笔记，限时完成历年真题，并参照评分标准进行自我评估。将额外时间投入最薄弱的专题，反复练习绘制电路图、光路图、仪器装置图等，直至能够脱离书本凭记忆准确复现。

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IGCSE CCEA Science: End-of-Term Revision Guide | IGCSE CCEA 科学：期末复习提纲