Edexcel Combined Science 099: Core Concepts and Exam Strategies | Edexcel 综合科学 099：核心概念与考试策略

📚 Edexcel Combined Science 099: Core Concepts and Exam Strategies | Edexcel 综合科学 099：核心概念与考试策略

Welcome to the TutorHao revision guide for Edexcel Combined Science 099. This article summarises the key concepts, typical exam questions, and effective revision strategies across biology, chemistry, and physics.

欢迎阅读 TutorHao 针对 Edexcel 综合科学 099 的复习指南。本文总结生物学、化学和物理的核心概念、常见考题及高效备考策略。

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1. Understanding the Specification and Assessment | 了解考试大纲与评估方式

Edexcel Combined Science 099 is a double-award qualification covering biology, chemistry and physics in two exam papers per science. Each paper includes multiple-choice, structured, short-answer and extended-response questions.

Edexcel 综合科学 099 是双证书资格考试，涵盖生物、化学和物理，每门科学分为两份试卷。每份试卷包含选择题、结构化题、简答题和扩展答题。

Paper 1 tests core practicals and theory from the first half of the specification; Paper 2 tests the remaining topics and synoptic links. Use the official specification and past papers as your primary resources.

试卷 1 考查前半部分大纲的核心实验与理论；试卷 2 考查剩余主题及综合联系。请以官方大纲和历年真题作为主要复习资料。

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2. Cell Biology and Microscopy | 细胞生物学与显微镜使用

Magnification is calculated as image size divided by actual size. Remember to convert all lengths to the same unit before calculating.

放大倍数的计算公式为：图像尺寸 ÷ 实际尺寸。计算前务必将所有长度换算为相同单位。

magnification = image size ÷ actual size

In osmosis, water moves across a partially permeable membrane from a dilute solution to a concentrated solution. Exam questions often ask you to predict mass changes in potato cylinders.

在渗透作用中，水通过部分透膜从稀溶液向浓溶液移动。考题常要求预测马铃薯条的质量变化。

When drawing cells from a microscope, use a sharp pencil, label visible structures, and do not shade large areas. State the magnification underneath the drawing.

绘制显微镜下的细胞图时，要用尖铅笔、标出可见结构，不要大面积涂阴影。在图下方注明放大倍数。

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3. Atomic Structure and the Periodic Table | 原子结构与元素周期表

Atoms contain protons, neutrons and electrons. The atomic number gives the number of protons, while the mass number is the total of protons plus neutrons.

原子包含质子、中子和电子。原子序数等于质子数，质量数为质子数与中子数之和。

number of neutrons = mass number − atomic number

Electron arrangement determines chemical reactivity. Group 1 metals lose one outer electron, whereas Group 7 non-metals gain one electron to form halide ions.

电子排布决定化学活泼性。第 1 族金属失去最外层 1 个电子，而第 7 族非金属获得 1 个电子形成卤离子。

In the periodic table, atomic radius generally increases down a group and decreases across a period. Use these trends when explaining reactivity or intermolecular forces.

在元素周期表中，原子半径通常沿族向下增大，沿周期从左到右减小。解释活泼性或分子间作用力时可使用这些趋势。

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4. Bonding and Chemical Reactions | 化学键与化学反应

Ionic bonding involves electron transfer from metals to non-metals, producing oppositely charged ions held by strong electrostatic forces. Covalent bonding involves shared pairs of electrons.

离子键涉及金属向非金属转移电子，形成由强静电引力束缚的带相反电荷离子。共价键则涉及共享电子对。

Balanced equations must have the same number of each type of atom on both sides. For example, CH₄ + 2O₂ → CO₂ + 2H₂O.

配平方程式后，两边每种原子的个数必须相等。例如 CH₄ + 2O₂ → CO₂ + 2H₂O。

CH₄ + 2O₂ → CO₂ + 2H₂O

Metals conduct electricity because delocalised electrons move through the lattice. Ionic compounds conduct only when molten or dissolved, because the ions are free to move.

金属能够导电是因为离域电子可以在晶格中移动。离子化合物仅在熔融或溶解时导电，因为此时离子可以自由移动。

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5. Forces and Motion | 力与运动

Newton’s second law links force, mass and acceleration: F = m × a. Weight is a force given by W = m × g, where g is gravitational field strength.

牛顿第二定律将力、质量和加速度联系起来：F = m × a。重力是力的一种，公式为 W = m × g，其中 g 为重力场强度。

F = m × a
W = m × g

Distance-time graphs and velocity-time graphs are common. Gradient of a distance-time graph gives speed; gradient of a velocity-time graph gives acceleration, and area under it gives distance travelled.

距离-时间图和速度-时间图是常见考点。距离-时间图的斜率表示速度；速度-时间图的斜率表示加速度，其下方面积表示位移/路程。

Forces can be contact forces, such as friction and tension, or non-contact forces, such as gravity and magnetism. Draw free-body diagrams to show direction and relative magnitude.

力可以是接触力，如摩擦力和张力；也可以是非接触力，如重力和磁力。画受力示意图时要标明方向和相对大小。

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6. Energy Transfers and Resources | 能量转移与能源

Energy cannot be created or destroyed, only transferred, stored or dissipated. Efficiency = useful output energy transfer ÷ total input energy transfer × 100%.

能量既不能产生也不能消灭，只能转移、储存或耗散。效率 = 有用输出能量 ÷ 总输入能量 × 100%。

efficiency = (useful output ÷ total input) × 100%

Renewable resources include solar, wind, hydroelectric and biomass. Non-renewables include coal, oil, gas and nuclear fuel. Be ready to compare their advantages and disadvantages.

可再生资源包括太阳能、风能、水力和生物质能。不可再生资源包括煤、石油、天然气和核燃料。要准备比较它们的优缺点。

The specific heat capacity equation ΔE = m × c × ΔT links energy change, mass, specific heat capacity and temperature change. Use it in heating and cooling calculations.

比热容公式 ΔE = m × c × ΔT 将能量变化、质量、比热容和温度变化联系起来。在加热和冷却计算中要使用它。

ΔE = m × c × ΔT

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7. Waves and the Electromagnetic Spectrum | 波与电磁波谱

Wave speed, frequency and wavelength are related by v = f × λ. For all electromagnetic waves, the speed in a vacuum is approximately 3.0 × 10⁸ m/s.

波速、频率和波长的关系为 v = f × λ。所有电磁波在真空中的速度约为 3.0 × 10⁸ m/s。

v = f × λ

In transverse waves, oscillations are perpendicular to energy transfer; in longitudinal waves, oscillations are parallel. Sound is longitudinal, whereas light is transverse.

横波的振动方向与能量传递方向垂直；纵波的振动方向与能量传递方向平行。声音是纵波，光是横波。

The electromagnetic spectrum runs from radio waves to gamma rays in order of increasing frequency and decreasing wavelength. Different regions have different uses and dangers.

电磁波谱从无线电波到伽马射线，频率依次增大，波长依次减小。不同波段有不同的用途和危害。

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8. Ecosystems and Homeostasis | 生态系统与稳态

Photosynthesis converts carbon dioxide and water into glucose and oxygen using light energy. The word equation is carbon dioxide + water → glucose + oxygen.

光合作用利用光能将二氧化碳和水转化为葡萄糖和氧气。文字方程式为：二氧化碳 + 水 → 葡萄糖 + 氧气。

carbon dioxide + water → glucose + oxygen

Homeostasis maintains a stable internal environment. Negative feedback reverses a change, such as increasing body temperature triggering sweating and vasodilation.

稳态维持内部环境的稳定。负反馈会逆转变化，例如体温升高会引发出汗和血管扩张。

In ecosystems, energy is lost at each trophic level through respiration, movement and undigested material. This explains why food chains are usually short.

在生态系统中，能量在每个营养级都会通过呼吸作用、运动及未消化物质而损失。这就解释了为什么食物链通常较短。

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9. Quantitative Chemistry and Calculations | 定量化学与计算

Mole calculations require using the formula n = m ÷ M, where n is amount in mol, m is mass in g, and M is molar mass in g/mol.

摩尔计算使用公式 n = m ÷ M，其中 n 为物质的量（mol），m 为质量（g），M 为摩尔质量（g/mol）。

n = m ÷ M

Concentration is amount divided by volume, often expressed in mol/dm³ or g/dm³. Titration calculations require careful conversion from cm³ to dm³ by dividing by 1000.

浓度等于物质的量除以体积，通常以 mol/dm³ 或 g/dm³ 表示。滴定计算需要将 cm³ 换算为 dm³，即除以 1000。

Use relative formula mass to convert between mass and moles. In a balanced equation, the mole ratio tells you the ratio of reacting substances.

用相对式量在质量和摩尔之间换算。在配平方程式中，摩尔比代表了反应物之间的物质的量之比。

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10. Electricity and Magnetism | 电与磁

Ohm’s law states that V = I × R. Series circuits share the same current, while parallel circuits share the same potential difference across branches.

欧姆定律为 V = I × R。串联电路各处电流相同，并联电路各支路两端电压相同。

V = I × R

Transformers only work with alternating current and follow the equation Vₚ ÷ Vₛ = Nₚ ÷ Nₛ. Electromagnetic induction occurs when a conductor cuts magnetic field lines.

变压器只能使用交流电，遵循公式 Vₚ ÷ Vₛ = Nₚ ÷ N

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