IB Edexcel Science: Final Exam Revision Checklist | IB Edexcel 科学：期末复习提纲

📚 IB Edexcel Science: Final Exam Revision Checklist | IB Edexcel 科学：期末复习提纲

Preparing for an IB or Edexcel science exam requires a strategic approach that goes beyond memorising facts. Whether you are tackling Biology, Chemistry, Physics, or a combined science syllabus, the final weeks should be dedicated to organised recap, targeted practice, and honing your analytical skills. This revision checklist brings together high-yield topics, core practical skills, and effective exam techniques drawn from both IB and Edexcel specifications. Use it to benchmark your progress and identify gaps before the big day.

准备 IB 或 Edexcel 科学考试需要的不仅是死记硬背，更要有策略地梳理知识、强化应用。无论你面对的是生物、化学、物理还是综合科学，期末阶段都应当投入有组织的回顾、针对性练习和分析能力的打磨。这份复习提纲整合了 IB 与 Edexcel 课程体系中高频出现的核心主题、实验技能与应试技巧，帮助你检验进度、找出薄弱环节，在考前做到胸有成竹。

1. Scientific Methodology | 科学方法论

Understand the difference between independent, dependent, and controlled variables. Be able to formulate a testable hypothesis and identify the aim of an experiment when reading a methods section.

掌握自变量、因变量和控制变量的区别。要能够提出可检验的假设，并在阅读实验方法时准确识别实验目的。

Quantitative data requires appropriate graph types – line graphs for continuous data, bar charts for categorical comparisons. Always label axes with quantities and units, and draw a line of best fit where trends are clear.

定量数据需要选择合适的图表——连续数据用折线图，分类对比用条形图。坐标轴务必标注物理量和单位，趋势明显时需画出最佳拟合线。

Error analysis is crucial: distinguish between systematic errors (affect accuracy) and random errors (affect precision). Know how to calculate the mean, range, and percentage error: (|experimental − accepted| / accepted) × 100%.

误差分析十分关键：区分系统误差（影响准确度）和随机误差（影响精密度）。会计算平均值、极差和百分误差：(|实验值 − 可接受值| / 可接受值) × 100%.

Reliability can be improved by repeating measurements and calculating means; validity requires keeping all control variables constant and only changing the independent variable.

提高可靠性可通过重复测量并计算平均值来实现；提高有效性则需保持所有控制变量不变，只改变自变量。

2. Biology: Cells and Life Processes | 生物学：细胞与生命过程

Compare the structures of prokaryotic and eukaryotic cells. Key eukaryotic organelles include the nucleus, mitochondria, ribosomes, and in plants, chloroplasts and a permanent vacuole. Prokaryotes lack a nucleus and membrane-bound organelles.

比较原核细胞与真核细胞的结构。真核细胞的关键细胞器包括细胞核、线粒体、核糖体，植物细胞还有叶绿体和永久大液泡。原核生物没有细胞核和膜包裹的细胞器。

Recall the balanced symbol equation for photosynthesis: 6CO₂ + 6H₂O → C₆H₁₂O₆ + 6O₂, and for aerobic respiration: C₆H₁₂O₆ + 6O₂ → 6CO₂ + 6H₂O (+ energy).

记住光合作用的配平符号方程式：6CO₂ + 6H₂O → C₆H₁₂O₆ + 6O₂，以及有氧呼吸的方程式：C₆H₁₂O₆ + 6O₂ → 6CO₂ + 6H₂O (+ 能量)。

Enzyme activity depends on temperature and pH; denaturation occurs when the active site changes shape permanently. Use lock-and-key model to explain specificity.

酶活性受温度和 pH 值影响；当活性位点永久变性时酶失活。用锁钥模型解释酶的专一性。

Understand active transport, diffusion, and osmosis as methods of cellular transport. Osmosis is the net movement of water across a partially permeable membrane from a region of higher water potential to a lower one.

理解主动运输、扩散和渗透作用作为细胞运输方式。渗透是水经过半透膜从水势较高区域向水势较低区域的净移动。

3. Biology: Genetics and Evolution | 生物学：遗传与进化

DNA is a double helix composed of nucleotides, each containing a sugar, phosphate, and a base (A, T, C, G). Base pairing rules: A−T, C−G. A gene is a section of DNA that codes for a protein.

DNA 是双螺旋结构，由核苷酸组成，每个核苷酸包含糖、磷酸和碱基（A、T、C、G）。碱基配对原则：A−T，C−G。基因是编码蛋白质的一段 DNA。

Use Punnett squares to predict outcomes of monohybrid crosses. Differentiate between genotype (alleles) and phenotype (observable characteristics). Know the meaning of homozygous, heterozygous, dominant, and recessive.

使用旁氏表预测单基因杂交的结果。区别基因型（等位基因组成）和表现型（可观察特征）。理解纯合、杂合、显性和隐性的含义。

Natural selection operates on heritable variation: individuals with advantageous traits survive, reproduce, and pass alleles to offspring. Over generations, allele frequencies shift – this is evolution.

自然选择作用于可遗传的变异：具有有利性状的个体得以生存繁殖并将等位基因传递给后代。经过多代，等位基因频率发生变化——这就是进化。

Selective breeding and genetic engineering are modern applications. In genetic engineering, a gene from one organism is inserted into another using vectors such as plasmids. Know examples like insulin production.

选择育种和基因工程是现代应用。基因工程中，利用质粒等载体将一种生物的基因插入另一种生物体内。熟记胰岛素生产等实例。

4. Biology: Ecology and Environment | 生物学：生态与环境

Describe the carbon cycle: carbon moves between atmosphere, plants, animals, decomposers, and fossil reserves via photosynthesis, respiration, feeding, decomposition, and combustion.

描述碳循环：碳通过光合作用、呼吸作用、取食、分解和燃烧在大气、植物、动物、分解者和化石燃料储库之间流动。

Biodiversity can be assessed using quadrats (for plants and slow-moving organisms) and transects (to show zonation). The index of diversity formula takes species richness and evenness into account.

用样方（适用于植物和行动缓慢的生物）和样线（显示带状分布）评估生物多样性。多样性指数公式综合考虑了物种丰富度和均匀度。

Explain the greenhouse effect: short-wave solar radiation enters, long-wave infrared is trapped by greenhouse gases (CO₂, CH₄, water vapour). Deforestation and fossil fuel combustion raise CO₂ levels, enhancing global warming.

解释温室效应：短波太阳辐射进入大气，长波红外线被温室气体（CO₂、CH₄、水蒸气）捕获。毁林和化石燃料燃烧使 CO₂ 浓度上升，加剧全球变暖。

Understand the nitrogen cycle: nitrogen fixation, nitrification, assimilation, ammonification, and denitrification. Bacteria play a crucial role in each step, converting N₂ into usable nitrate ions.

理解氮循环：固氮、硝化、同化、氨化和反硝化作用。细菌在各个步骤中起关键作用，将 N₂ 转化为可用的硝酸根离子。

5. Chemistry: Atomic Structure and Bonding | 化学：原子结构与化学键

Atoms consist of protons (p⁺), neutrons (n⁰), and electrons (e⁻). Atomic number = number of protons; mass number = protons + neutrons. Isotopes differ in neutron count. The electron configuration follows 2,8,8 up to the first 20 elements.

原子由质子（p⁺）、中子（n⁰）和电子（e⁻）构成。原子序数 = 质子数；质量数 = 质子数 + 中子数。同位素的中子数不同。前 20 号元素的电子排布遵循 2、8、8 规律。

Ionic bonding occurs between metals and non-metals, involving electron transfer. Giant ionic lattices have high melting points and conduct electricity when molten or dissolved because ions are free to move.

离子键形成于金属与非金属之间，涉及电子转移。巨型离子晶格熔点高，熔融或溶于水时能导电，因为离子可以自由移动。

Covalent bonds involve shared pairs of electrons. Simple molecular substances (e.g., H₂O, CO₂) have low melting points. Giant covalent structures (diamond, graphite, SiO₂) have exceptionally high melting points; graphite conducts electricity due to delocalised electrons.

共价键涉及共用电子对。简单分子物质（如 H₂O、CO₂）熔点低。巨型共价结构（金刚石、石墨、SiO₂）熔点极高；石墨因离域电子而能导电。

Metallic bonding is the attraction between positive metal ions and delocalised electrons. This explains malleability, ductility, and excellent thermal and electrical conductivity.

金属键是正金属离子与离域电子间的吸引作用。这解释了金属的延展性、可锻性，以及优良的导热导电性。

6. Chemistry: Reactions and Stoichiometry | 化学：反应与化学计量

Balance chemical equations to conserve mass. Use state symbols: (s), (l), (g), (aq). Understand the mole concept: one mole = 6.02 × 10²³ particles = Mᵣ in grams.

配平化学方程式以遵循质量守恒。使用状态符号：(s)、(l)、(g)、(aq)。理解摩尔概念：1 摩尔 = 6.02 × 10²³ 个微粒 = 以克为单位的相对分子质量。

Calculate concentration (mol/dm³), volume, and mass. Use the triangle: n = m / Mᵣ and c = n / V. Titer calculations require the molar ratio from the balanced equation.

计算浓度（mol/dm³）、体积和质量。运用公式三角：n = m / Mᵣ 和 c = n / V。滴定计算需根据配平方程式的摩尔比进行。

Reactions can be endothermic (ΔH positive, absorb energy) or exothermic (ΔH negative, release energy). Bond breaking is endothermic; bond making is exothermic. Calculate overall ΔH using bond energies: ΔH = Σ(bonds broken) − Σ(bonds formed).

反应可分为吸热（ΔH 为正，吸收能量）和放热（ΔH 为负，释放能量）。断键吸热，成键放热。使用键能计算总焓变：ΔH = Σ(断裂键能) − Σ(形成键能)。

Rates of reaction are affected by concentration, temperature, surface area, and catalysts. Explain using collision theory: particles must collide with sufficient energy (activation energy) and correct orientation.

反应速率受浓度、温度、表面积和催化剂影响。用碰撞理论解释：粒子必须以足够的能量（活化能）和正确的取向碰撞。

7. Chemistry: Organic Chemistry Basics | 化学：有机化学基础

Hydrocarbons that contain only single C−C bonds are alkanes (CₙH₂ₙ₊₂); those with at least one C=C double bond are alkenes (CₙH₂ₙ). Alkenes turn bromine water from orange to colourless – a test for unsaturation.

仅含碳碳单键的烃为烷烃（CₙH₂ₙ₊₂）；含有至少一个 C=C 双键的为烯烃（CₙH₂ₙ）。烯烃可使溴水由橙色变为无色——这是检验不饱和性的方法。

Functional groups determine the properties of organic compounds: alcohols (-OH), carboxylic acids (-COOH), esters (-COO-). Know typical reactions such as combustion, oxidation of alcohols, and esterification.

官能团决定有机化合物的性质：醇（-OH）、羧酸（-COOH）、酯（-COO-）。掌握典型反应，如燃烧、醇的氧化和酯化反应。

Polymers: addition polymers form from alkenes (e.g., polyethene from ethene). Condensation polymers involve loss of small molecules (e.g., water) and include polyesters and polyamides. Be aware of environmental problems with non-biodegradable plastics.

聚合物：加成聚合物由烯烃形成（如聚乙烯由乙烯聚合）。缩合聚合物在形成时脱去小分子（如水），包括聚酯和聚酰胺。注意不可降解塑料带来的环境问题。

Crude oil is separated by fractional distillation. Fractions have different boiling points due to chain length; shorter chains boil at lower temperatures. Cracking breaks long alkanes into shorter, more useful alkenes and alkanes.

原油通过分馏进行分离。各馏分的沸点因碳链长度不同而异；短链烃沸点较低。裂化将长链烷烃断裂成更短、更有用的烯烃和烷烃。

8. Physics: Mechanics and Forces | 物理：力学与力

Scalar quantities have magnitude only (speed, distance, mass); vectors have magnitude and direction (velocity, displacement, force). Use arrows to represent vector quantities and resolve them into components.

标量只有大小（速率、路程、质量）；矢量既有大小又有方向（速度、位移、力）。用箭头表示矢量，并可将其分解为分量。

Newton’s first law: an object remains at rest or uniform motion unless acted on by a resultant force. Second law: F = m × a. Third law: action-reaction pairs act on different bodies and are equal in magnitude but opposite in direction.

牛顿第一定律：物体将保持静止或匀速直线运动状态，除非有合力作用。第二定律：F = m × a。第三定律：作用力与反作用力大小相等、方向相反，并作用在不同物体上。

Kinematics equations for constant acceleration (where u = initial velocity, v = final velocity, a = acceleration, t = time, s = displacement) are essential. Memorise: v = u + a t, s = u t + ½ a t², v² = u² + 2 a s.

匀加速直线运动的运动学方程（u 初速度，v 末速度，a 加速度，t 时间，s 位移）必须掌握。记住：v = u + a t, s = u t + ½ a t², v² = u² + 2 a s。

Moments: the turning effect of a force equals force × perpendicular distance from pivot. For equilibrium, sum of clockwise moments = sum of anticlockwise moments. Center of gravity is the point where weight appears to act.

力矩：力的转动效应等于力 × 支点的垂直距离。平衡时，顺时针力矩之和等于逆时针力矩之和。重心是重力看似作用的点。

9. Physics: Energy and Waves | 物理：能量与波动

Energy can be stored as kinetic, gravitational potential, elastic, thermal, chemical. Kinetic energy = ½ m v², gravitational potential energy = m g h. Understand conservation of energy: total energy in a closed system remains constant, but energy is dissipated (often as thermal) to the surroundings.

能量可以动能、重力势能、弹性势能、热能和化学能等形式储存。动能 = ½ m v²，重力势能 = m g h。理解能量守恒：封闭系统内的总能量保持不变，但能量会散逸（通常为热）到周围环境中。

Waves transfer energy without transferring matter. Distinguish transverse (e.g., light, water waves) and longitudinal (e.g., sound) waves. Use the wave equation: v = f λ (velocity = frequency × wavelength).

波传递能量而不传递物质。区分横波（如光波、水波）和纵波（如声波）。使用波动方程：v = f λ（波速 = 频率 × 波长）。

The electromagnetic spectrum, in order of increasing frequency: radio, microwave, infrared, visible (ROYGBIV), ultraviolet, X-ray, gamma. All travel at speed of light in a vacuum (c ≈ 3.00 × 10⁸ m/s). Higher frequency means higher energy and shorter wavelength.

电磁波谱按频率递增顺序为：无线电波、微波、红外线、可见光（红橙黄绿蓝靛紫）、紫外线、X 射线、伽马射线。所有电磁波在真空中均以光速传播（c ≈ 3.00 × 10⁸ m/s）。频率越高，能量越大，波长越短。

In reflection, angle of incidence equals angle of reflection. In refraction, waves change speed and direction when entering a medium of different density. Use Snell’s law: n₁ sin θ₁ = n₂ sin θ₂ (IB extension).

反射定律中，入射角等于反射角。折射中，波进入密度不同的介质时会改变速度和方向。使用斯涅尔定律：n₁ sin θ₁ = n₂ sin θ₂（IB 拓展）。

10. Physics: Electricity and Magnetism | 物理：电与磁

Current (I) is the rate of flow of charge. Voltage (V) is energy per unit charge. Resistance (R) opposes current flow. Ohm’s law: V = I R holds until temperature changes cause resistance variation.

电流（I）是电荷流动的速率。电压（V）是单位电荷的能量。电阻（R）阻碍电流。欧姆定律 V = I R 在温度不变时成立，温度变化会导致电阻改变。

In series circuits, current is the same everywhere; total resistance Rₜ = R₁ + R₂ + … . In parallel, the voltage across each branch is the same while current splits. Use 1/Rₜ = 1/R₁ + 1/R₂ for parallel resistors.

串联电路中，电流处处相等；总电阻 Rₜ = R₁ + R₂ + … 。并联电路中，各支路电压相同而电流分流。并联电阻总电阻用 1/Rₜ = 1/R₁ + 1/R₂ 计算。

Electrical power: P = I V = I² R = V² / R. Energy transferred E = P t. Household electricity uses AC; safety devices include fuses and circuit breakers that prevent overcurrent.

电功率：P = I V = I² R = V² / R。能量转移 E = P t。家庭用电使用交流电；安全装置如熔断器和断路器可防止过流。

Magnetic fields are produced by permanent magnets and electromagnets. A current-carrying wire in a magnetic field experiences a force (motor effect). Fleming’s left-hand rule gives force direction: thuMb – Motion, First finger – Field, seCond finger – Current.

磁场由永磁体和电磁体产生。通电导线在磁场中会受到力（电动机效应）。左手定则（Fleming’s left-hand rule）给出力的方向：拇指 – 运动（Motion），食指 – 磁场（Field），中指 – 电流（Current）。

11. Data Analysis and Practical Skills | 数据分析与实验技能

Show all working in calculations and use appropriate units. Round final answers to the least number of significant figures consistent with the data given. Always check whether a calculated result is sensible within the context of the question.

计算过程展现全部步骤并使用合适单位。最终答案保留到与所给数据一致的最小有效数字位数。始终检查计算结果在题目情境中是否合理。

When drawing graphs, use pencil for points and a sharp line. Include error bars if uncertainty data is provided. For IB, both standard deviation and standard error may be expected in higher-level analysis.

绘图时，用铅笔标点并画出清晰的线条。如有不确定度数据，应画出误差棒。IB 高阶分析可能需要用到标准差和标准误差。

Lab-based questions test your understanding of apparatus, safety precautions, and fair-test design. Be ready to suggest improvements to a given experimental setup, addressing both accuracy and reliability.

实验题目考查对仪器、安全措施和公平实验设计的理解。要能针对给定的实验装置提出改进建议，以兼顾准确度和可靠性。

For Edexcel Core Practicals and IB Internal Assessment, ensure you can describe the method, identify risks, and state how results are interpreted. Common practicals include titration, circuits, enzyme temperatures, and wave speed measurements.

针对 Edexcel 核心实验和 IB 内部评估，务必能描述方法、识别风险并说明如何解释结果。常见实验包括滴定、电路搭建、酶温实验和波速测量。

12. Exam Techniques and Common Mistakes | 考试技巧与常见错误

Read the question carefully: many marks are lost by answering what you think it asks rather than what is actually written. Underline command terms such as ‘explain’, ‘describe’, ‘compare’, ‘calculate’.

仔细审题：许多失分是因为答非所问，而不是不理解内容。圈出指令词，如“解释”、“描述”、“比较”、“计算”。

Manage time effectively. Allocate roughly one minute per mark. If a question is proving difficult, move on and return later – you must secure marks on topics you know well first.

有效分配时间。大致按 1 分 1 分钟分配。如果某题棘手，果断跳过稍后回头再做——要先确保拿下你熟悉的题目的分数。

Use correct scientific terminology. For instance, instead of vague phrases like ‘it goes up’, say ‘the temperature increases linearly’ or ‘the rate of reaction increases exponentially’. Precision shows deeper understanding.

使用正确的科学术语。例如，不要用模糊的 “它上升了”，而应说 “温度线性升高” 或 “反应速率呈指数增长”。精准的表达展示出更深的理解。

Beware of unit conversions. A classic trap is mixing cm³ and dm³, or kJ and J. Write down conversions explicitly: 1 m³ = 1000 dm³ = 1,000,000 cm³; 1 kJ = 1000 J.

小心单位换算。典型陷阱包括混淆 cm³ 和 dm³，或 kJ 与 J。明明白白写下换算：1 m³ = 1000 dm³ = 1 000 000 cm³；1 kJ = 1000 J。

Topic / 主题	Quick Self-Check / 快速自检
Cells & Enzymes / 细胞与酶	Can I draw a labelled animal/plant cell and explain the lock-and-key model? / 我能画出带标签的动植物细胞并解释锁钥模型吗？
Moles & Titration / 摩尔与滴定	Can I convert between mass, moles, and concentration and use a titration concordant? / 我能在质量、摩尔和浓度间转换并使用滴定相一致数据吗？
Forces & Motion / 力与运动	Can I sketch a velocity-time graph and use its area to find displacement? / 我能画出速度-时间图并用面积求位移吗？
Atomic Structure / 原子结构	Can I write electron configurations for elements 1–20? / 我能写出 1-20 号元素的电子排布吗？
Genetics / 遗传学	Can I predict offspring genotypes using a Punnett square? / 我能用旁氏表预测后代基因型吗？

By methodically working through this checklist, you will transform disconnected facts into a coherent, exam-ready understanding of science. Revisit any section where you hesitated and practise with past questions until the reasoning feels automatic. Consistent application of these principles, combined with careful self-evaluation, is the surest route to top grades in IB or Edexcel science.

通过有条不紊地完成这份复习提纲，你将把零散的知识点整合为连贯的、适合应考的科学理解。对任何犹豫的部分都要重温复习，并通过真题练习直到推理变得熟练自如。持续运用这些原则，再加上仔细的自我评估，是通往 IB 或 Edexcel 科学高分的可靠路径。

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IB Edexcel Science: Final Exam Revision Checklist | IB Edexcel 科学：期末复习提纲