📚 Mastering Edexcel A-Level Sciences: 188 High-Yield Combined Revision Points | 攻克 Edexcel A-Level 科学：188 个高频综合考点
This article brings together 188 high-yield facts, equations and exam skills for Edexcel A-Level Physics, Chemistry and Biology. Use it as a combined revision checklist for the final weeks before the exam.
本文汇总了 Edexcel A-Level 物理、化学和生物三科的 188 个高频考点、方程和应试技巧，可作为考前综合复习清单。
1. How to Use the 188-Point Checklist | 如何利用 188 个考点清单
Treat the 188 points as an active recall checklist. Tick each point only when you can explain it from memory and link it to an exam-style question.
把 188 个考点当作主动回忆清单。只有当你能凭记忆解释某个考点，并能将其与考试题型联系起来时，才算真正掌握。
Use three passes. First pass identifies gaps; second pass turns the weakest points into condensed notes; third pass tests each point with a timed past-paper question.
建议采用三轮复习法。第一轮找出薄弱环节；第二轮把最弱的知识点整理成精简笔记；第三轮用限时真题检验每一个考点。
Because Physics, Chemistry and Biology share mathematical, practical and data-analysis skills, mastering the combined techniques across sciences will raise your total A-Level performance.
物理、化学和生物共享数学、实验与数据分析能力，掌握跨学科的综合技巧能整体提升你的 A-Level 成绩。
2. Physics: Mechanics and Materials | 物理：力学与材料
Start with the SUVAT equations for uniform acceleration. They link initial velocity u, final velocity v, acceleration a, time t and displacement s.
先从匀加速运动的 SUVAT 方程开始。它们联系初速度 u、末速度 v、加速度 a、时间 t 和位移 s。
v = u + at | s = ut + ½at² | v² = u² + 2as
Always choose the equation that contains only one unknown, and take direction into account by using positive and negative signs consistently.
始终选择只含一个未知量的方程，并通过始终如一地使用正负号来考虑方向。
Newton' p/Δt where momentum p = mv. Conservation of momentum applies to collisions and explosions.
牛顿定律是核心。第二定律给出 F = ma，用动量形式写作 F = Δp/Δt，其中动量 p = mv。动量守恒适用于碰撞和爆炸。
Material properties require stress, strain and the Young modulus. Stress is force per unit area, strain is extension per original length, and the Young modulus is stress ÷ strain under elastic deformation.
材料性质涉及应力、应变和杨氏模量。应力是单位面积上的力，应变是伸长量与原长之比，杨氏模量是弹性形变下的应力 ÷ 应变。
Stress = F / A | Strain = ΔL / L | E = Stress / Strain
Describe elastic and plastic regions on a force-extension graph. Area under the graph gives work done, and energy stored in a stretched spring is ½FΔL or ½kΔL².
在力-伸长图像上描述弹性区和塑性区。图像下方面积表示做功，拉伸弹簧储存的能量为 ½FΔL 或 ½kΔL²。
3. Physics: Waves, Electricity and Quantum | 物理：波、电与量子
constant when a wave passes from one medium to another, so wavelength changes with speed.
对所有波都成立的速度方程为 v = fλ。波从一种介质进入另一种介质时频率保持不变，因此波长随波速变化。
ce = nλ, and stationary waves form when two identical waves travel in opposite directions.
叠加原理导致相长干涉和相消干涉。双源干涉亮条纹出现在光程差 = nλ 处；驻波在两列相同波反向传播时形成。
ance. Series circuits share current, and parallel circuits share voltage. The potential divider equation is Vout = Vin × R₂/(R₁ + R₂).
在电学中，V = IR 定义电阻。串联电路电流相同，并联电路电压相同。分压器方程为 Vout = Vin × R₂/(R₁ + R₂)。
The photoelectric effect gives evidence for photons. Einstein' KE_max, where φ is the work function. Wave theory cannot explain the threshold frequency.
光电效应为光子提供证据。爱因斯坦方程为 E = hf = φ + KE_max，其中 φ 是逸出功。波动理论无法解释截止频率。
E = hf | V = IR | P = VI | Rtotal = R₁ + R₂ in series
4. Chemistry: Physical and Inorganic Core | 化学：物理化学与无机核心
P for gases, and the ideal gas equation is pV = nRT. Always convert temperature to kelvin.
摩尔是核心量。n = m/M，气体在室温常压下 n = V/24 dm³，理想气体方程为 pV = nRT。始终把温度换算为开尔文。
Enthalpy changes use Hess's law. ΔH = ΣΔHf products − ΣΔHf reactants, or ΔH = Σbond energies broken − Σbond energies formed. Watch the sign of ΔH.
焓变使用盖斯定律。ΔH = ΣΔHf 生成物 − ΣΔHf 反应物，或 ΔH = Σ断键吸收能量 − Σ成键放出能量。注意 ΔH 的正负号。
Equilibrium constants are written from concentrations or partial pressures. For aA + bB ⇌ cC + dD, Kc = [C]c[D]d / [A]a[B]b. Kp uses partial pressures.
平衡常数由浓度或分压写出。对 aA + bB ⇌ cC + dD，Kc = [C]ᶜ[D]ᵈ / [A]ᵃ[B]ᵇ。Kp 使用分压。
Acids and bases: pH = -log₁₀[H⁺], and [H⁺] = 10⁻ᵖᴴ e Ka = [H⁺][A⁻]/[HA]. Buffers resist pH changes on adding small amounts of acid or alkali.
酸碱：pH = -log₁₀[H⁺]，[H⁺] = 10⁻ᵖᴴ。弱酸部分电离，因此用 Ka = [H⁺][A⁻]/[HA]。缓冲溶液在加入少量酸或碱时抵抗 pH 变化。
sitive E°cell means a feasible reaction. Transition metals show variable oxidation states and form coloured complexes.
氧化还原与电极电势：E°电池 = E°还原 − E°氧化。E°电池为正值表示反应可行。过渡金属具有可变化合价并形成有色配合物。
5. Chemistry: Organic and Analytical Techniques | 化学：有机与分析技术
Learn the functional groups for alkanes, alkenes, alcohols, haloalkanes, aldehydes, ketones, carboxylic acids, esters, amines and amides. Each functional group determines the mechanism and reagents.
掌握烷烃、烯烃、醇、卤代烃、醛、酮、羧酸、酯、胺和酰胺的官能团。官能团决定反应机理
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