IGCSE Science: Last-Minute Revision Notes | IGCSE 科学：考前冲刺笔记

📚 IGCSE Science: Last-Minute Revision Notes | IGCSE 科学：考前冲刺笔记

The IGCSE Science exam can seem daunting, but focused last-minute revision can significantly boost your confidence and performance. These notes highlight the most frequently tested concepts, essential formulas, and key experimental skills across Biology, Chemistry, and Physics. Use this guide to consolidate your knowledge and polish your exam technique.

IGCSE 科学考试可能令人生畏，但考前有针对性的冲刺复习能显著提升你的信心和表现。这份笔记总结了生物、化学和物理中最常考的概念、必会公式和关键实验技能。用这份指南来巩固知识并打磨你的应试技巧。

---

1. Exam Structure and Marking Scheme | 考试结构与评分方案

IGCSE Science typically consists of three papers: a multiple-choice paper (Paper 1 or 2), a theory paper (Paper 3 or 4), and a practical assessment (Paper 5: Practical Test or Paper 6: Alternative to Practical). Know which components you will sit.

IGCSE 科学通常包含三份试卷：一份选择题卷 (Paper 1 或 2)、一份理论卷 (Paper 3 或 4) 和一份实验评估 (Paper 5: 实验操作考试 或 Paper 6: 替代实验)。明确你将要参加的试卷。

The multiple-choice paper accounts for 30% of the total marks. It tests broad knowledge and quick recall. Each question carries equal weight, so do not spend too long on any one item.

选择题卷占总分的 30%。它考察广泛的知识和快速回忆。每题分值相等，不要在某一道题上花费过多时间。

The theory paper is worth 50% and includes short-answer and longer structured questions. Command words like ‘describe’, ‘explain’, ‘calculate’ and ‘suggest’ require different approaches – pay close attention to them.

理论卷占 50%，包含简答题和较长的结构化问题。指令词如 ‘describe (描述)’、’explain (解释)’、’calculate (计算)’ 和 ‘suggest (建议)’ 要求不同的作答方式——务必仔细留意。

The practical paper (either hands-on or written alternative) accounts for the remaining 20%. It evaluates your ability to design experiments, record data, draw graphs, and draw valid conclusions.

实验考试（实际操作或书面替代）占剩下的 20%。它评估你设计实验、记录数据、绘制图表和得出结论的能力。

---

2. Key Physics Formulas and Concepts | 物理核心公式与概念

Memorize the essential equations for motion, forces, energy, waves, and electricity. Many are provided on the formula sheet, but rapid recall saves time.

熟记运动、力、能量、波和电学的基本公式。尽管许多公式会在公式表中提供，但快速回忆能节省时间。

Motion: average speed = total distance / total time (v = s / t). Acceleration = change in velocity / time taken (a = (v − u) / t). Be careful with units: m/s, m/s², and convert km/h to m/s by dividing by 3.6.

运动：平均速率 = 总路程 / 总时间 (v = s / t)。加速度 = 速度变化量 / 时间 (a = (v − u) / t)。注意单位：m/s、m/s²，将 km/h 转换为 m/s 需要除以 3.6。

Forces: Force = mass × acceleration (F = m × a). Weight = mass × gravitational field strength (W = m × g). On Earth, g ≈ 10 m/s². Understand that resultant force causes acceleration, and balanced forces maintain constant velocity or rest.

力：力 = 质量 × 加速度 (F = m × a)。重量 = 质量 × 引力场强度 (W = m × g)。地球上 g 约为 10 m/s²。理解合力产生加速度，而平衡力保持匀速或静止。

Energy: Kinetic energy = ½ × m × v²; Gravitational potential energy = m × g × h. Efficiency = useful energy output / total energy input × 100%.

能量：动能 = ½ × m × v²；重力势能 = m × g × h。效率 = 有用能量输出 / 总能量输入 × 100%。

Electricity: Voltage (V) = Current (I) × Resistance (R). Power = V × I = I²R. In series circuits, current is the same, voltage divides. In parallel, voltage is the same, current divides.

电学：电压 (V) = 电流 (I) × 电阻 (R)。功率 = V × I = I²R。串联电路中电流处处相等，电压则分流；并联电路中电压相等，电流分流。

Waves: Wave speed = frequency × wavelength (v = f × λ). Know reflection, refraction (including Snell’s law n = sin i / sin r if applicable), and total internal reflection when the angle of incidence exceeds the critical angle.

波：波速 = 频率 × 波长 (v = f × λ)。掌握反射、折射（如适用，折射定律 n = sin i / sin r）以及当入射角大于临界角时的全内反射。

---

3. Essential Chemistry: Reactions, Moles, and Bonding | 化学必备：反应、摩尔与键合

Master balancing equations and using state symbols (s), (l), (g), (aq). For example: 2Mg(s) + O₂(g) → 2MgO(s).

掌握配平化学方程式和使用状态符号 (s)、(l)、(g)、(aq)。例如：2Mg(s) + O₂(g) → 2MgO(s)。

The mole concept is crucial. Number of moles = mass (g) / molar mass (g/mol). At room temperature and pressure (RTP), 1 mole of any gas occupies 24 dm³. Use this to calculate gas volumes.

摩尔概念至关重要。摩尔数 = 质量 (g) / 摩尔质量 (g/mol)。在室温和常压下 (RTP)，1 摩尔任何气体占据 24 dm³。用它来计算气体体积。

Know the four main reaction types: neutralization (acid + base → salt + water), precipitation, redox, and thermal decomposition. Learn tests for common gases: hydrogen pops with a lit splint; oxygen relights a glowing splint; carbon dioxide turns limewater milky; chlorine bleaches damp litmus paper.

了解四种主要反应类型：中和（酸+碱→盐+水）、沉淀、氧化还原和热分解。记住常见气体的检验：氢气遇燃着木条发出爆鸣声；氧气可使带火星木条复燃；二氧化碳使石灰水变浑浊；氯气使湿润石蕊试纸褪色。

Bonding: Ionic bonding involves electron transfer between metal and non-metal, forming a giant ionic lattice with high melting points. Covalent bonding involves electron sharing, forming simple molecules (e.g., H₂O, CO₂) or giant covalent structures (diamond, graphite, SiO₂). Graphite conducts electricity due to delocalized electrons.

键合：离子键涉及金属与非金属之间的电子转移，形成熔点高的巨型离子晶格。共价键涉及电子共用，形成简单分子（如 H₂O、CO₂）或巨型共价结构（金刚石、石墨、SiO₂）。石墨因离域电子而导电。

For rates of reaction: rate can be increased by higher temperature, higher concentration, larger surface area, or use of a catalyst. You must be able to interpret graphs of mass lost or volume of gas produced over time.

对于反应速率：升高温度、提高浓度、增大表面积或使用催化剂均可提高反应速率。你必须能够解读质量损失或气体产生量随时间变化的图表。

---

4. Biology Must-Knows: Processes and Definitions | 生物必备：过程与定义

Published by TutorHao | IGCSE Science Revision Series | aleveler.com

更多咨询请联系16621398022（同微信）