IGCSE Edexcel Science: Comprehensive Revision Guide | IGCSE Edexcel 科学：全面复习指南

📚 IGCSE Edexcel Science: Comprehensive Revision Guide | IGCSE Edexcel 科学：全面复习指南

This guide covers the key topics of the Edexcel IGCSE Science (Double Award) specification, including Biology, Chemistry and Physics. It focuses on core concepts, common exam pitfalls and effective revision strategies.

本指南涵盖 Edexcel IGCSE 科学（双奖）规范中的关键主题，包括生物、化学和物理，重点讲解核心概念、常见考试陷阱以及高效复习策略。

You will sit six papers across the three sciences, and practical knowledge is tested within those papers. Understanding the fundamental ideas and being able to apply them to unfamiliar contexts is essential for success.

你将在三门科学科目中参加六场考试，实验知识会在试卷中考查。理解基本概念并能在陌生情境中加以应用，是取得好成绩的关键。

1. Overview of the Edexcel IGCSE Science Specification | Edexcel IGCSE 科学考试概述

The Edexcel IGCSE Science (Double Award) gives you a broad understanding of all three sciences. Each subject contributes equally to your final grade, and there are two papers for each subject.

Edexcel IGCSE 科学（双奖）使你全面了解三门科学。每个学科在最终成绩中所占比例相同，每个学科有两份试卷。

Paper 1 tests core material, while Paper 2 covers more demanding concepts and the ability to apply knowledge to new situations. Both papers contain a mixture of question styles, including multiple-choice, short-answer and extended written answers.

试卷 1 考查核心知识，试卷 2 涵盖更有难度的概念以及在新情境中应用知识的能力。两份试卷包含多种题型，包括选择题、简答题和长答题。

Calculators are allowed in all papers, but you must show your working clearly for calculation questions. Units are also vital; losing marks for missing or incorrect units is common.

所有试卷均允许使用计算器，但在计算题中你必须清晰地展示解题步骤。单位同样至关重要，因遗漏或写错单位而丢分的情况十分常见。

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2. Biology: Cell Structure and Organisation | 生物：细胞结构与组织

All living organisms are made of cells. In the IGCSE syllabus you need to understand the structure and function of key organelles in animal and plant cells.

所有生物体都由细胞组成。在 IGCSE 教学大纲中，你需要理解动物细胞和植物细胞中关键细胞器的结构和功能。

The nucleus controls cell activities and contains genetic material (DNA). The cytoplasm is a jelly-like substance where most chemical reactions take place.

细胞核控制细胞活动并包含遗传物质（DNA）。细胞质是一种胶状物质，大多数化学反应在此发生。

The cell membrane controls the movement of substances in and out of the cell. Mitochondria are the site of aerobic respiration, releasing energy.

细胞膜控制物质进出细胞。线粒体是有氧呼吸的场所，能释放能量。

Plant cells additionally have a cellulose cell wall for support, chloroplasts for photosynthesis, and a permanent vacuole filled with cell sap.

植物细胞还拥有用于支撑的纤维素细胞壁、进行光合作用的叶绿体，以及充满细胞液的中央液泡。

You should also be able to compare prokaryotic (bacterial) cells with eukaryotic cells. Bacterial cells do not have a true nucleus or membrane-bound organelles.

你还应能比较原核（细菌）细胞与真核细胞。细菌细胞没有真正的细胞核或膜包被的细胞器。

Diffusion is the net movement of particles from high to low concentration. Osmosis is the diffusion of water through a partially permeable membrane. Active transport moves substances against the concentration gradient and requires energy.

扩散是粒子从高浓度到低浓度的净运动。渗透是水通过半透膜的扩散。主动运输逆浓度梯度运输物质，需要消耗能量。

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3. Biology: Photosynthesis and Respiration | 生物：光合作用与呼吸作用

Photosynthesis is the process by which plants make glucose using light energy. Carbon dioxide and water are converted into glucose and oxygen.

光合作用是植物利用光能制造葡萄糖的过程。二氧化碳和水转化为葡萄糖和氧气。

6CO₂ + 6H₂O → C₆H₁₂O₆ + 6O₂

The rate of photosynthesis is limited by light intensity, carbon dioxide concentration and temperature. This is often tested using an aquatic plant such as Elodea and counting oxygen bubbles.

光合作用速率受到光照强度、二氧化碳浓度和温度的限制。考试常以水藻类植物如伊乐藻为材料，通过计数氧气气泡来测试这一点。

Aerobic respiration is the release of energy from glucose using oxygen. It occurs in mitochondria and produces carbon dioxide and water.

有氧呼吸是利用氧气从葡萄糖中释放能量的过程，发生在线粒体中，产生二氧化碳和水。

C₆H₁₂O₆ + 6O₂ → 6CO₂ + 6H₂O

Anaerobic respiration in humans produces lactic acid, causing muscle fatigue. In yeast, anaerobic respiration produces ethanol and carbon dioxide, which is important in brewing and baking.

人体无氧呼吸产生乳酸，导致肌肉疲劳。酵母菌无氧呼吸产生乙醇和二氧化碳，这在酿造和烘焙中非常重要。

You should understand the word equations for both aerobic and anaerobic respiration, and be able to compare the amounts of energy released.

你需要理解有氧和无氧呼吸的文字方程式，并能比较它们释放能量的多少。

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

An atom consists of protons, neutrons and electrons. Protons have a positive charge, electrons have a negative charge, and neutrons are neutral.

原子由质子、中子和电子组成。质子带正电荷，电子带负电荷，中子不带电。

The atomic number is the number of protons in an atom. The mass number is the total number of protons and neutrons.

原子序数是原子中的质子数。质量数是质子数和中子数之和。

Mass number = protons + neutrons

Isotopes are atoms of the same element with the same number of protons but different numbers of neutrons. For example, carbon-12 and carbon-14 are both isotopes of carbon.

同位素是同一元素的原子，它们具有相同的质子数但不同的中子数。例如，碳-12 和碳-14 都是碳的同位素。

Ionic bonding occurs when electrons are transferred from a metal to a non-metal, forming oppositely charged ions. Sodium chloride (NaCl) is a classic example.

离子键发生在电子从金属转移到非金属时，形成带相反电荷的离子。氯化钠（NaCl）是典型例子。

Covalent bonding involves the sharing of electron pairs between non-metal atoms. Water (H₂O), methane (CH₄) and carbon dioxide (CO₂) all contain covalent bonds.

共价键是非金属原子之间共享电子对形成的。水（H₂O）、甲烷（CH₄）和二氧化碳（CO₂）都含有共价键。

You may be asked to draw dot-and-cross diagrams, so practice representing the outer electrons of simple molecules such as hydrogen, chlorine and oxygen.

考试可能要求你绘制电子点叉图，所以要练习表示氢、氯、氧等简单分子的外层电子。

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5. Chemistry: Acids, Bases and Salts | 化学：酸、碱与盐

Acids produce hydrogen ions (H⁺) in water, while bases produce hydroxide ions (OH⁻) in water. Alkalis are soluble bases that release OH⁻ ions.

酸在水中产生氢离子（H⁺），而碱在水中产生氢氧根离子（OH⁻）。可溶性碱是能释放 OH⁻ 离子的碱。

The pH scale measures acidity and alkalinity. A pH of 7 is neutral, below 7 is acidic and above 7 is alkaline.

pH 标度用于衡量酸碱度。pH 为 7 表示中性，低于 7 为酸性，高于 7 为碱性。

Indicators change colour depending on pH. Litmus turns red in acid and blue in alkali. Universal indicator gives a wider colour range.

指示剂随 pH 变化而变色。石蕊在酸中变红，在碱中变蓝。万能指示剂提供更广泛的颜色范围。

Neutralisation is the reaction between an acid and a base to form a salt and water. For example:

中和反应是酸与碱反应生成盐和水的过程。例如：

HCl + NaOH → NaCl + H₂O

To make soluble salts, you can react an acid with an insoluble base, filter off the excess and evaporate the filtrate. This method is often tested with copper(II) oxide and dilute sulfuric acid.

制备可溶性盐时，可以将酸与不溶性碱反应，过滤掉多余的固体，然后蒸发滤液。这一方法常以氧化铜和稀硫酸为例进行考查。

You should also recall the tests for common gases: hydrogen gives a squeaky pop with a lit splint; carbon dioxide turns limewater milky; oxygen relights a glowing splint.

你还应记住常见气体的检验方法：氢气遇燃着的木条发出尖锐爆鸣声；二氧化碳使石灰水变浑浊；氧气能让带火星的木条复燃。

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6. Physics: Forces and Motion | 物理：力与运动

Speed is the distance travelled per unit time. Velocity is speed in a given direction. Acceleration is the change in velocity per unit time.

速率是单位时间内通过的距离。速度是在给定方向上的速率。加速度是单位时间内速度的变化量。

speed = distance ÷ time

acceleration = (final velocity − initial velocity) ÷ time

A distance-time graph shows how distance changes with time. A straight line means constant speed. A horizontal line means the object is stationary.

距离-时间图显示距离随时间的变化。直线表示匀速运动，水平线表示物体静止。

A velocity-time graph shows acceleration as the gradient of the line. The area under the graph represents distance travelled.

速度-时间图中，直线的斜率表示加速度，图线与时间轴围成的面积表示通过的距离。

Newton’s first law states that an object remains at rest or moves at constant velocity unless acted upon by a resultant force. The second law links force, mass and acceleration.

牛顿第一定律指出，除非受到合外力作用，否则物体保持静止或匀速直线运动状态。第二定律将力、质量和加速度联系起来。

F = m × a

Weight is the force due to gravity on a mass. On Earth, gravitational field strength is approximately 10 N/kg.

重量是质量受到的重力。在地球上，重力场强度约为 10 N/kg。

weight = mass × gravitational field strength

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

Electric current is the flow of charge (electrons) in a circuit. Potential difference (voltage) is the energy transferred per unit charge.

电流是电荷（电子）在电路中的流动。电势差（电压）是单位电荷所转移的能量。

V = I × R

Ohm’s law relates voltage (V), current (I) and resistance (R). In a resistor at constant temperature, current is directly proportional to voltage.

欧姆定律描述电压（V）、电流（I）和电阻（R）的关系。在温度恒定的电阻中，电流与电压成正比。

In a series circuit, current is the same at all points, and voltages add up. In a parallel circuit, voltage is the same across each branch, and currents add up.

在串联电路中，电流处处相同，电压相加。在并联电路中，每个支路两端的电压相同，电流相加。

Magnets have north and south poles. Like poles repel and unlike poles attract. A magnetic field is the region around a magnet where a force acts on another magnet or magnetic material.

磁铁有北极和南极。同名磁极相互排斥，异名磁极相互吸引。磁场是磁体周围对其中的其他磁体或磁性物质产生力的区域。

An electromagnet is made by coiling a wire around an iron core. Its strength increases with more turns of wire, a larger current, or the use of a soft iron core.

电磁铁是通过将导线绕在铁芯上制成的。增加线圈匝数、增大电流或使用软铁芯都能增强其磁力。

You should be able to draw simple circuit diagrams using standard symbols for cells, lamps, switches, ammeters and voltmeters.

你应该能够使用电池、灯泡、开关、电流表和电压表的标准符号绘制简单电路图。

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8. Experimental Skills and Data Analysis | 实验技能与数据分析

In Edexcel IGCSE Science, 20% of the marks come from questions about experimental work. You need to understand the key ideas of variables, controls and errors.

在 Edexcel IGCSE 科学中，20% 的分数来自实验相关题目。你需要理解变量、对照和误差等关键概念。

An independent variable is what you change. A dependent variable is what you measure. Control variables must be kept constant to ensure a fair test.

自变量是你所改变的变量。因变量是你所测量的变量。控制变量必须保持不变，以确保实验公平。

Accuracy is how close a measurement is to the true value. Precision is how consistent repeated measurements are. A precise result may still be inaccurate if the equipment is faulty.

准确度指测量值与真实值的接近程度。精密度指重复测量结果之间的一致性。如果仪器有缺陷，精密的结果仍可能不准确。

Systematic errors push values consistently in one direction, while random errors cause unpredictable scatter. Repeating readings and calculating the mean can reduce random errors.

系统误差使数值始终偏向某一方向，随机误差会导致无法预测的散布。重复测量并计算平均值可以减少随机误差。

When drawing graphs, always label axes with quantity and unit, use a suitable scale, and draw best-fit lines where appropriate. Identify anomalies and do not include them in the line.

绘制图表时，务必为坐标轴标注量和单位，选择合适的刻度，并尽可能绘制最佳拟合线。识别异常点，不要将其包含在线内。

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9. Common Mistakes and How to Avoid Them | 常见错误及避免方法

One frequent error is forgetting units in calculations. Always write the final answer with the correct unit, such as metres per second (m/s) or newtons (N).

一个常见错误是计算中忘记写单位。请始终在最终答案中写明正确单位，例如米每秒（m/s）或牛顿（N）。

Another mistake is confusing atomic number with mass number. Remember: atomic number = protons, mass number = protons + neutrons.

另一个错误是混淆原子序数与质量数。记住：原子序数 = 质子数，质量数 = 质子数 + 中子数。

In photosynthesis, students sometimes forget that oxygen comes from water, not carbon dioxide. Use the equation to guide your answer.

在光合作用中，学生有时会忘记氧气来源于水而不是二氧化碳。利用方程式来指导你的回答。

When drawing velocity-time graphs, check whether the question asks for distance or displacement. Distance is the total area under the graph, while displacement includes direction.

在绘制速度-时间图时，要检查题目要求的是路程还是位移。路程是图线下方的总面积，而位移包含方向。

Writing the word “heat” instead of “temperature” is also a common issue. Heat is energy in transit, while temperature measures the average kinetic energy of particles.

将”热量”与”温度”混用也是一个常见问题。热量是传递中的能量，而温度衡量粒子的平均动能。

Finally, do not panic if a question uses unfamiliar wording. Underline key terms, break the question into parts and use your scientific knowledge to reason through it.

最后，遇到陌生的措辞不要慌张。画出关键词，将问题拆解为若干部分，运用科学知识进行推理。

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10. Final Revision Strategies | 最后复习策略

Active recall is more effective than re-reading notes. Close your book and write down everything you remember about a topic, then check your notes for gaps.

主动回忆比重读笔记更有效。合上书，写下你记住的关于某个主题的所有内容，然后对照笔记找出遗漏。

Practise past papers under timed conditions. Then mark yourself honestly and analyse every mistake by topic type, not just by score.

在限时条件下做历年真题。然后诚实打分，并按题型分析每个错误，而不仅仅关注分数。

Create a revision timetable that covers all three sciences. Spend more time on weak areas, but keep revisiting strong topics so you do not forget them.

制定一个涵盖三门科学的复习时间表。在薄弱环节上花更多时间，但要定期复习强项，以免遗忘。

Use flashcards for key definitions, equations and lab tests. The act of making cards helps you organise information, and self-testing with cards strengthens memory.

使用抽认卡记忆关键定义、方程式和实验检验方法。制作卡片的过程有助于整理信息，而自我测试能强化记忆。

In the final few days before the exam, focus on concise summary sheets, formula lists and command words such as “state”, “describe”, “explain” and “compare”. Each command word requires a different level of detail.

在考前最后几天，重点复习简洁的总结页、公式列表和指令词，如”state”、”describe”、”explain”和”compare”。不同指令词需要不同的回答深度。

Stay calm and sleep well before each paper. A fresh brain recalls information faster and makes fewer careless errors.

每场考试前保持冷静，保证充足睡眠。清醒的大脑能更快地回忆信息，减少粗心错误。

Published by TutorHao | Science Revision Series | aleveler.com

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