📚 AS Chemistry: End-of-Term Revision Checklist | AS 化学：期末复习提纲
As the AS Chemistry exam approaches, a structured revision checklist can help you consolidate key concepts, identify weak areas, and build confidence. This guide summarises the essential topics across physical, inorganic, and organic chemistry, aligned with typical AS syllabuses. Use it to track your progress and focus your study sessions effectively.
随着 AS 化学考试的临近，一份有条理的复习提纲可以帮助你巩固核心概念、发现薄弱环节并建立信心。本指南总结了物理化学、无机化学和有机化学中的关键主题，与常见的 AS 课程大纲保持一致。用它来追踪你的复习进度，高效安排学习。
1. Atomic Structure and Electron Configuration | 原子结构与电子排布
Review the fundamental particles: protons, neutrons, and electrons, including their relative masses and charges. Understand isotopes and how to calculate relative atomic mass from isotopic abundance data. Master electron configurations using s, p, d notation and the Aufbau principle, with reference to the periodic table. Learn to interpret first and successive ionisation energy graphs, linking jumps to shell structure and electron shielding.
回顾基本粒子：质子、中子和电子，包括它们的相对质量和电荷。理解同位素以及如何从同位素丰度数据计算相对原子质量。掌握使用 s、p、d 表示法和构造原理书写电子排布，并参照周期表。学会解读第一电离能和连续电离能图，将突跃与电子层结构和屏蔽效应联系起来。
Key definitions: atomic number, mass number, orbital, ionisation energy. Be able to write electron configurations for atoms and ions up to Z=36, including those of chromium and copper as exceptions.
关键定义：原子序数、质量数、原子轨道、电离能。能够书写原子序数到 36 的原子和离子的电子排布，包括铬和铜的例外情况。
2. Chemical Bonding and Intermolecular Forces | 化学键与分子间作用力
This section covers ionic, covalent, and metallic bonding. For ionic bonding, focus on lattice energy trends and the properties of ionic compounds. For covalent bonding, practise drawing Lewis structures, determining molecular shapes using VSEPR theory, and identifying bond polarity. Understand the concept of dative covalent bonds.
本节涵盖离子键、共价键和金属键。对于离子键，重点掌握晶格能的变化趋势和离子化合物的性质。对于共价键，练习绘制路易斯结构，运用 VSEPR 理论判断分子形状，并识别键的极性。理解配位共价键的概念。
Explain the three main types of intermolecular force: London dispersion forces, permanent dipole-dipole interactions, and hydrogen bonding. Relate the strength of these forces to physical properties such as boiling point and solubility. Be prepared to compare the boiling points of compounds like H₂O, H₂S, NH₃ and PH₃.
解释三种主要的分子间作用力：伦敦色散力、永久偶极-偶极作用和氢键。将这些力的强度与物理性质（如沸点和溶解度）联系起来。准备比较 H₂O、H₂S、NH₃ 和 PH₃ 等化合物的沸点。
3. Moles, Formulae and Equations | 摩尔、化学式与方程式
Ensure you are confident with the mole concept: n = m/M and n = V/Vₘ for gases at RTP. Practise balancing equations, including ionic equations. Revise empirical and molecular formula calculations, percentage yield, atom economy, and limiting reagent problems. Use titration results to determine unknown concentrations and identify the water of crystallisation in hydrated salts.
确保你熟练掌握摩尔概念：n = m/M 以及在室温常压下气体的 n = V/Vₘ。练习配平化学方程式，包括离子方程式。复习经验式和分子式的计算、产率、原子经济性和限量试剂问题。运用滴定结果确定未知浓度，并鉴别水合盐中的结晶水。
Remember the standard solution preparation steps and the indicators used in acid-base titrations (e.g., phenolphthalein, methyl orange). Be able to back-calculate from experimental data even if the formula is not initially known.
记住标准溶液的配制步骤以及酸碱滴定中使用的指示剂（如酚酞、甲基橙）。即使最初不知道化学式，也要能够根据实验数据反向推导。
4. Energetics and Enthalpy Changes | 能量学与焓变
Define enthalpy change ΔH, exothermic and endothermic reactions. Learn to construct and interpret energy profile diagrams. Familiarise yourself with standard enthalpy changes: ΔH⦵c, ΔH⦵f, ΔH⦵r, and ΔH⦵neut. Use the equation q = mcΔT to calculate heat change from calorimetry experiments and convert to molar enthalpy change.
定义焓变 ΔH，放热反应和吸热反应。学会绘制并解释能量变化图。熟悉标准焓变：ΔH⦵c、ΔH⦵f、ΔH⦵r 和 ΔH⦵neut。利用 q = mcΔT 公式从量热实验计算热量变化，并换算为摩尔焓变。
A key skill is using Hess’s law to determine enthalpy changes indirectly, either through enthalpy cycles or algebraic manipulation of given data. Also revise average bond energy calculations and their limitations.
一个关键技能是运用盖斯定律间接计算焓变，可以通过焓循环图或给定数据的代数运算来完成。还要复习平均键能的计算及其局限性。
5. Kinetics: Rates and Maxwell-Boltzmann Distribution | 动力学：速率与麦克斯韦-玻尔兹曼分布
Understand the collision theory and how concentration, pressure, temperature, surface area, and catalysts affect the rate of reaction. Explain these effects in terms of successful collisions with energy equal to or greater than the activation energy Eₐ.
理解碰撞理论以及浓度、压强、温度、表面积和催化剂如何影响反应速率。用能量等于或大于活化能 Eₐ 的有效碰撞来解释这些影响。
Describe the Maxwell-Boltzmann distribution curve and how changes in temperature or the addition of a catalyst alter the fraction of particles possessing sufficient energy. Be able to sketch and interpret these curves accurately. Recall that a catalyst provides an alternative pathway with a lower activation energy.
描述麦克斯韦-玻尔兹曼分布曲线，以及温度变化或加入催化剂如何改变具有足够能量的粒子比例。能够准确绘制并解释这些曲线。记住催化剂提供了活化能更低的替代路径。
Practical methods for measuring rate include gas collection, mass loss, and colour change. Know how to calculate the rate from a concentration-time graph and draw a tangent at t=0 to find initial rate.
测量速率的实验方法包括气体收集、质量损失和颜色变化。知道如何从浓度-时间图计算速率，并在 t=0 处绘制切线以求得初始速率。
6. Chemical Equilibria and Le Chatelier’s Principle | 化学平衡与勒夏特列原理
Distinguish between dynamic equilibrium and static equilibrium. For reversible reactions, state the conditions for equilibrium. Write the expression for the equilibrium constant Kc in terms of concentration, and understand why solids and liquids are omitted. Perform calculations involving initial amounts, changes, and equilibrium quantities using the ICE table method.
区分动态平衡与静态平衡。对于可逆反应，说明达到平衡的条件。用浓度写出平衡常数 Kc 的表达式，并理解为何固体和纯液体不写入表达式。运用 ICE 表格法进行涉及初始量、变化量和平衡量的计算。
Apply Le Chatelier’s principle to predict the effect on position of equilibrium of changes in concentration, pressure, and temperature. Explain how temperature changes alter the value of Kc and why catalysts have no effect on equilibrium position. For gaseous reactions, connect equilibrium shifts to industrial processes such as the Haber and Contact processes.
运用勒夏特列原理预测浓度、压强和温度变化对平衡位置的影响。解释温度变化如何改变 Kc 值，以及催化剂为何对平衡位置没有影响。对于气体反应，将平衡移动与哈伯法和接触法等工业过程联系起来。
7. Redox Reactions and Oxidation States | 氧化还原反应与氧化数
Define oxidation and reduction in terms of electron transfer and changes in oxidation number. Learn the rules for assigning oxidation states and use them to identify which species are oxidised/reduced and to construct half-equations.
从电子转移和氧化数变化的角度定义氧化和还原。学习分配氧化数的规则，并用它们来识别哪种物质被氧化/还原，以及构建半反应式。
Combine half-equations to form full ionic redox equations. Practise balancing redox reactions in acidic conditions. Understand the reactivity of common oxidising and reducing agents, such as KMnO₄, K₂Cr₂O₇, and metals like zinc.
将半反应式合并为完整的离子氧化还原方程式。练习在酸性条件下配平氧化还原反应。理解常见氧化剂和还原剂的反应性，例如 KMnO₄、K₂Cr₂O₇ 以及锌等金属。
8. Inorganic Chemistry: Periodicity, Group 2 and Group 17 | 无机化学：周期律、第2族与第17族
Describe the trend in atomic radius, first ionisation energy, and melting point across Period 3 from Na to Ar. Explain these trends using nuclear charge, shielding, and bonding type. For Group 2 (alkaline earth metals), revise the trends in atomic radius, reactivity with water, and solubility of hydroxides and sulfates.
描述第三周期从 Na 到 Ar 的原子半径、第一电离能和熔点的变化趋势。用核电荷、屏蔽效应和键合类型解释这些趋势。对于第2族（碱土金属），复习原子半径、与水反应的活性以及氢氧化物和硫酸盐的溶解度变化规律。
For Group 17 (halogens), study the trend in electronegativity, boiling point, and oxidising power. Memorise the displacement reactions of halide ions by more reactive halogens, and the reaction of halide salts with concentrated sulfuric acid, noting the reduction products such as SO₂, S, and H₂S. Include the test for halide ions using acidified silver nitrate followed by ammonia solution.
对于第17族（卤素），学习电负性、沸点和氧化能力的变化趋势。记住活泼卤素对卤离子的置换反应，以及卤化物盐与浓硫酸的反应，注意还原产物 SO₂、S 和 H₂S。包括使用酸化硝酸银和氨水检验卤离子的方法。
9. Introduction to Organic Chemistry: Nomenclature, Isomerism, and Key Reactions | 有机化学入门：命名、异构与重要反应
Learn the IUPAC rules for naming alkanes, alkenes, halogenoalkanes, alcohols, aldehydes, ketones, and carboxylic acids up to six carbon atoms. Understand structural isomerism (chain, position, functional group) and stereoisomerism (E/Z and cis/trans), using Cahn-Ingold-Prelog priority rules where required.
学习碳原子数不超过六个的烷烃、烯烃、卤代烷、醇、醛、酮和羧酸的 IUPAC 命名规则。理解结构异构（碳链异构、位置异构、官能团异构）和立体异构（E/Z 和顺反异构），必要时使用 Cahn-Ingold-Prelog 优先规则。
For alkanes, revise radical substitution with Cl₂ or Br₂ in UV light, including initiation, propagation, and termination steps. For alkenes, cover electrophilic addition with HBr, H₂SO₄, Br₂, and hydrogenation, along with the mechanism and the major/minor products predicted by Markovnikov’s rule. Test for unsaturation using bromine water.
对于烷烃，复习在紫外光下与 Cl₂ 或 Br₂ 的自由基取代反应，包括引发、增长和终止步骤。对于烯烃，涵盖与 HBr、H₂SO₄、Br₂ 的亲电加成以及加氢反应，同时掌握反应机理以及用马尔科夫尼科夫规则预测的主次要产物。用溴水检验不饱和键。
Halogenoalkanes undergo nucleophilic substitution with OH⁻, CN⁻, and NH₃. Explain the difference between SN1 and SN2 mechanisms in terms of rate-determining steps and carbocation stability. Alcohols can be prepared by hydration of ethene or fermentation, and demonstrate reactions such as combustion, oxidation to carbonyls and carboxylic acids, and elimination to alkenes.
卤代烷与 OH⁻、CN⁻ 和 NH₃ 发生亲核取代。从速率控制步骤和碳正离子稳定性的角度解释 SN1 和 SN2 机理的区别。醇可以通过乙烯水合或发酵制备，并展示其反应，如燃烧、氧化为羰基化合物和羧酸，以及消除得到烯烃。
10. Analytical Techniques: Titration, IR and Mass Spectrometry | 分析技术：滴定、红外与质谱
Reinforce the practical technique of acid-base titration, including rinsing procedures, reading the meniscus, and identifying concordant results. Calculate mean titre and use it to find the molarity of an unknown solution or the purity of a sample.
强化酸碱滴定的实验操作，包括润洗步骤、读取弯月面和识别吻合的结果。计算平均滴定体积，并用它求出未知溶液的浓度或样品纯度。
For infrared spectroscopy, memorise the characteristic absorption ranges for O-H (broad, 3200-3600 cm⁻¹), C=O (sharp, 1680-1750 cm⁻¹), C-O, C=C, and C-H bonds. Use the fingerprint region to identify specific compounds but not for detailed assignment. In mass spectrometry, interpret fragmentation patterns, identify the molecular ion peak M⁺, and use this to deduce molecular mass and structure, recognising common fragments such as CH₃⁺ (m/z=15) or C₂H₅⁺ (m/z=29).
对于红外光谱，记住特征吸收范围：O-H（宽峰，3200-3600 cm⁻¹）、C=O（尖锐，1680-1750 cm⁻¹）、C-O、C=C 和 C-H 键。利用指纹区识别特定化合物，但不用于详细归属。在质谱中，解析碎片离子峰，识别分子离子峰 M⁺，并用其推断分子质量和结构，识别常见碎片如 CH₃⁺（m/z=15）或 C₂H₅⁺（m/z=29）。
| Functional Group | IR Absorption (cm⁻¹) |
| O-H (alcohols, carboxylic acids) | 3200-3600 (broad) |
| C=O (carbonyl) | 1680-1750 (sharp) |
| C=C (alkene) | 1620-1680 |
| C-H (alkane) | 2850-2960 |
This table summarises the key IR peaks you must remember. Use it alongside mass spectra data to solve structural problems in exam questions.
此表总结了你必须记住的关键红外吸收峰。将其与质谱数据结合，解决考试中的结构问题。
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