📚 CIE IGCSE Chemistry Core Knowledge Review | Year 11 CIE 化学：核心知识点梳理
This article provides a structured overview of the most important topics covered in the Year 11 CIE IGCSE Chemistry syllabus. It is designed to help you consolidate your understanding and identify key concepts across the entire course.
本文系统梳理了 Year 11 CIE IGCSE 化学课程的核心主题，旨在帮助你巩固知识体系，快速定位各章节的关键概念。
1. States of Matter and the Kinetic Particle Theory | 物质的态与动力学粒子理论
The kinetic particle theory states that all matter is made of tiny particles in constant motion. The arrangement and energy of these particles determine whether a substance is a solid, liquid or gas.
动力学粒子理论指出，所有物质都由不断运动的微小粒子构成。粒子的排列方式与能量决定了物质处于固态、液态还是气态。
In solids, particles are held tightly in a regular lattice and can only vibrate about fixed positions. This explains why solids have a fixed shape and volume.
在固态中，粒子紧密排列成规则晶格，只能在固定位置振动，因此固体具有固定的形状和体积。
In liquids, particles are close together but can slide past one another, allowing liquids to flow and take the shape of their container.
液态中粒子仍紧密接触，但能相互滑动，使得液体可以流动并呈现容器的形状。
In gases, particles are far apart, move rapidly in random directions, and have negligible attractive forces between them. Gases fill any container completely.
气态中粒子间距很大，快速无规运动，粒子间吸引力可以忽略，因此气体会完全充满容器。
Changes of state, such as melting, boiling, condensing and freezing, occur when the temperature and energy of the particles change. Diffusion provides evidence for the kinetic particle theory.
熔化、沸腾、凝结与凝固等状态变化，都是粒子温度和能量改变的结果。扩散现象为动力学粒子理论提供了证据。
| State | Arrangement | Movement |
|---|---|---|
| Solid | Regular, closely packed | Vibrate about fixed positions |
| Liquid | Irregular, close together | Slide past each other |
| Gas | Far apart, random | Fast, random straight-line motion |
2. Atomic Structure | 原子结构
An atom consists of a central nucleus containing protons and neutrons, surrounded by electrons in shells. Protons carry a positive charge, neutrons are neutral, and electrons are negative.
原子由一个居于中心的原子核（含质子和中子）与核外分层排布的电子组成。质子带正电，中子不带电，电子带负电。
The atomic (proton) number Z defines the element, while the mass (nucleon) number A is the total number of protons and neutrons. In a neutral atom, the number of electrons equals Z.
原子序数（质子数）Z 决定了元素种类；质量数（核子数）A 等于质子数与中子数之和。中性原子中，电子数等于 Z。
Isotopes are atoms of the same element with the same number of protons but different numbers of neutrons. They have identical chemical properties because they have the same electron arrangement.
同位素是质子数相同但中子数不同的同种原子。由于电子排布相同，同位素的化学性质相同。
Electrons are arranged in shells (energy levels). The first shell holds up to 2 electrons, the second up to 8, and the third up to 8 for the first 20 elements. The electronic configuration explains an element's position in the Periodic Table and its reactivity.
电子分层排布，第一层最多容纳 2 个电子，第二层 8 个，第三层对前 20 号元素也是 8 个。电子排布决定了元素在周期表中的位置及其反应活性。
Example: Na (Z=11) → 2.8.1
3. Chemical Bonding and Structure | 化学键与结构
Ionic bonding occurs when metals transfer electrons to non-metals, forming oppositely charged ions that attract each other in a giant ionic lattice. These compounds have high melting points and conduct electricity when molten or dissolved.
离子键是金属向非金属转移电子，形成正负离子，通过静电引力构成巨型离子晶格。离子化合物熔点高，在熔融或溶于水时可导电。
Covalent bonding involves the sharing of electrons between non-metal atoms to achieve a full outer shell. Simple molecular substances have low melting points and do not conduct electricity.
共价键是非金属原子间通过共用电子对形成。简单分子物质熔点低，不导电。
Giant covalent structures, such as diamond, graphite and silicon dioxide, consist of many atoms linked by covalent bonds. Diamond is very hard, while graphite is soft and conducts electricity due to delocalised electrons.
巨型共价结构（如金刚石、石墨、二氧化硅）由大量原子通过共价键连接。金刚石极硬，而石墨质软且因离域电子可导电。
Metallic bonding arises from a 'sea' of delocalised electrons surrounding positive metal ions. It explains malleability, ductility and high electrical conductivity of metals.
金属键来自“电子海”中离域电子围绕金属正离子。这解释了金属的延展性、可锻性和优良的导电性。
Na⁺ Cl⁻ (ionic); O=C=O (covalent); Mg⇌Mg²⁺ + 2e⁻ (metallic)
4. Stoichiometry and the Mole Concept | 化学计量学与摩尔概念
The relative atomic mass (Aᵣ) is the average mass of an atom compared to 1/12th the mass of carbon‑12. The relative molecular mass (Mᵣ) is the sum of the Aᵣ values of all atoms in a formula.
相对原子质量 Aᵣ 是一个原子的平均质量与碳‑12 质量的 1/12 的比值。相对分子质量 Mᵣ 是化学式中各原子 Aᵣ 之和。
²³ mol⁻¹. The mass of one mole (molar mass) is numerically equal to the Aᵣ or Mᵣ in grams.
1 摩尔是含有阿伏伽德罗常数（6.02 × 10²³）个粒子的物质的量。摩尔质量在数值上等于 Aᵣ 或 Mᵣ，单位为 g/mol。
n = m / Mᵣ and n = V (gas) / 24 dm³ mol⁻¹ (at r.t.p.)
Empirical formula shows the simplest whole‑number ratio of atoms; molecular formula shows the actual numbers. Using reacting masses and moles, you can calculate limiting reactants and percentage yield.
实验式表示原子数的最简整数比，分子式表示实际原子数。利用反应质量和物质的量可计算限制反应物和产率。
5. Electrochemistry | 电化学
Electrolysis is the decomposition of an ionic compound using direct electric current. Positive ions (cations) migrate to the cathode to gain electrons (reduction), while negative ions (anions) move to the anode to lose electrons (oxidation).
电解是利用直流电分解离子化合物的过程。阳离子移向阴极得电子（还原），阴离子移向阳极失电子（氧化）。
ced to Pb at the cathode, and Br⁻ ions are oxidized to Br₂ at the anode: 2Br⁻ → Br₂ + 2e⁻.
电解熔融溴化铅时，Pb²⁺ 在阴极还原为 Pb，Br⁻ 在阳极氧化为 Br₂：2Br⁻ → Br₂ + 2e⁻。
In aqueous solutions, the products depend on the relative reactivity of the ions and the presence of water. At the cathode, if the metal is more reactive than hydrogen, hydrogen gas is produced; otherwise the metal deposits.
在水溶液电解中，产物取决于离子相对活性和水的参与。在阴极，若金属比氢活泼，则放出氢气；否则金属析出。
Electroplating and purification of copper both use electrolysis: the object to be plated is made the cathode, and the pure metal is the anode.
电镀和铜的精炼都利用电解：被镀物件作阴极，纯金属作阳极。
6. Energy Changes in Chemical Reactions | 化学反应中的能量变化
In an exothermic reaction, energy is released to the surroundings, causing a temperature rise. Combustion, neutralisation and respiration are typical examples. The enthalpy change ΔH is negative.
放热反应向环境释放能量，温度升高。燃烧、中和与呼吸作用是常见例子。焓变 ΔH 为负值。
In an endothermic reaction, energy is absorbed from the surroundings, causing a temperature drop. Thermal decomposition and photosynthesis are endothermic; ΔH is positive.
吸热反应从环境吸收能量，温度下降。热分解与光合作用属于吸热反应；ΔH 为正值。
Bond breaking is endothermic (requires energy), while bond making is exothermic (releases energy). The overall ΔH of a reaction is the balance between these two.
断裂化学键是吸热过程，形成化学键是放热过程。反应的总体 ΔH 取决于两者之差。
Energy level diagrams and simple calorimetry experiments allow us to determine the enthalpy change of a reaction, for example by measuring the temperature change of water.
能级图和简易量热实验可测定反应焓变，例如通过测量水的温度变化。
7. Rates of Reaction and Equilibrium | 反应速率与平衡
The rate of a chemical reaction can be measured by following the change in mass, volume of gas produced, or appearance of a precipitate over time.
化学反应速率可通过跟踪质量变化、产生气体的体积或沉淀出现的时间来测量。
Collision theory states that for a reaction to occur, particles must collide with sufficient energy (activation energy) and correct orientation. Increasing concentration, temperature, surface area, or using a catalyst all increase the rate by either raising collision frequency or lowering activation energy.
碰撞理论指出，粒子必须具有足够能量（活化能）并以正确取向碰撞才能发生反应。增加浓度、温度、表面积或使用催化剂均可提高反应速率，或增加碰撞频率，或降低活化能。
Catalysts provide an alternative pathway with lower activation energy, but are not used up in the reaction. Enzymes are biological catalysts.
催化剂提供一条活化能更低的反应途径，自身在反应中不被消耗。酶属于生物催化剂。
Reversible reactions reach a dynamic equilibrium when the forward and reverse rates become equal. The position of equilibrium can be shifted by changes in temperature or pressure (for gases), as described by Le Chatelier's principle.
可逆反应在正逆反应速率相等时达到动态平衡。根据勒夏特列原理，改变温度或压强（对于气体）可使平衡位置移动。
8. Acids, Bases and Salts | 酸、碱和盐
An acid is a proton (H⁺) donor. Common laboratory acids include hydrochloric acid HCl, sulfuric acid H₂SO₄ and nitric acid HNO₃. Strong acids fully ionise in water, while weak acids partially ionise.
酸是质子（H⁺）供体。实验室常见酸有盐酸 HCl、硫酸 H₂SO₄ 和硝酸 HNO₃。强酸在水中完全电离，弱酸部分电离。
Bases are proton acceptors and include metal oxides and hydroxides. Soluble bases are called alkalis; they release OH⁻ ions in water.
碱是质子接受体，包括金属氧化物和氢氧化物。可溶性碱称为碱，在水中释放 OH⁻。
The pH scale (0‑ < 7 acidic, pH = 7 neutral, pH > 7 alkaline. Universal indicator or pH probes can be used.
pH 标度（0‑14）衡量溶液的酸碱度：pH < 7 为酸性，pH = 7 中性，pH > 7 碱性。可用通用指示剂或 pH 探头测定。
ith a metal, a base or a carbonate produces different salts. Soluble salts can be prepared by titration, followed by evaporation and crystallisation.
中和反应生成盐和水：H⁺ + OH⁻ → H₂O。酸与金属、碱或碳酸盐反应可制得不同盐类。可溶性盐可通过滴定、蒸发和结晶制备。
9. The Periodic Table | 元素周期表
The Periodic Table arranges elements in order of increasing atomic number. Groups are vertical columns containing elements with the same number of outer-shell electrons, leading to similar chemical properties.
周期表按原子序数递增顺序排列元素。族为竖列，同族元素最外层电子数相同，因而化学性质相似。
Group I elements (alkali metals) are soft, low‑density metals that react vigorously with water to form alkaline solutions and hydrogen gas. Reactivity increases down the group because the outer electron is more easily lost.
第 I 族（碱金属）为质软、密度低的金属，与水剧烈反应生成碱性溶液和氢气。由于更易失去外层电子，活泼性由上至下增强。
Group VII elements (halogens) are diatomic non-metals. Reactivity decreases down the group: a more reactive halogen can displace a less reactive one from its halide solution.
第 VII 族（卤素）为双原子非金属分子。活泼性由上至下减弱：较活泼的卤素可从卤化物溶液中置换出较不活泼的卤素。
Group VIII (noble gases) are monatomic and unreactive due to their full outer electron shells. Transition elements form coloured compounds, can act as catalysts, and often have variable oxidation states.
第 VIII 族（稀有气体）为单原子分子，因最外层电子已满而不活泼。过渡元素形成有色化合物，可用作催化剂，常具有可变氧化态。
10. Metals and Reactivity Series | 金属与活动性顺序
The reactivity series lists metals in order of their tendency to lose electrons and form positive ions. Potassium is the most reactive, followed by sodium, calcium, magnesium, aluminium, zinc, iron, and copper.
活动性顺序按照金属失电子形成阳离子的倾向排列。钾最活泼，其余依次为钠、钙、镁、铝、锌、铁、铜等。
ions. For example, zinc displaces copper from copper(II) sulfate: Zn + CuSO₄ → ZnSO₄ + Cu.
较活泼金属能置换出化合物溶液中较不活泼的金属，如锌从硫酸铜中置换出铜：Zn + CuSO₄ → ZnSO₄ + Cu。
Metals react with acids to produce a salt and hydrogen gas, provided the metal is more reactive than hydrogen. The rate of bubbling indicates their relative reactivity.
在金属活动性比氢强时，金属与酸反应生成盐和氢气。气泡产生的速率可反映其相对活泼性。
Extraction methods depend on the metal's reactivity. Metals more reactive than carbon, like aluminium, are extracted by electrolysis; those below carbon, like iron, can be extracted by reduction with carbon.
金属冶炼方法取决于其活泼性。比碳活泼的金属（如铝）采用电解法冶炼；不及碳活泼的（如铁）可用碳还原。
11. Air, Water and the Environment | 空气、水与环境
Air is a mixture of gases: around 78% nitrogen, 21% oxygen, with small proportions of argon, carbon dioxide and water vapour. Fractional distillation of liquid air allows separation based on boiling points.
空气是混合气体：约 78% 氮气、21% 氧气，以及少量氩气、二氧化碳和水蒸气。液态空气分馏可利用沸点差异将各组分分离。
Water is purified by filtration, sedimentation and chlorination to make it safe to drink. Distillation provides pure water but requires more energy.
水通过过滤、沉降和氯化消毒净化以达到饮用标准。蒸馏可得到纯水但耗能较高。
Common pollutants include carbon monoxide (toxic, incomplete combustion), sulfur dioxide (acid rain), oxides of nitrogen (acid rain, photochemical smog), and greenhouse gases such as CO₂ and methane, which contribute to global warming.
常见污染物包括一氧化碳（有毒，不完全燃烧产物）、二氧化硫（酸雨）、氮氧化物（酸雨、光化学烟雾）以及温室气体 CO₂ 和甲烷，加剧全球变暖。
verters in cars convert harmful gases into less harmful substances: 2CO + 2NO → 2CO₂ + N₂.
汽车催化转换器将有害气体转化为危害较小的物质：2CO + 2NO → 2CO₂ + N₂。
12. Introduction to Organic Chemistry | 有机化学初步
Organic chemistry is the study of carbon‑based compounds. Hydrocarbons contain only carbon and hydrogen. Alkanes are saturated (single bonds only), with general formula CₙH₂ₙ₊₂.
有机化学研究碳基化合物。烃仅含碳和氢。烷烃是饱和烃（只有单键），通式为 CₙH₂ₙ₊₂。
l formula CₙH₂ₙ. They undergo addition reactions, for instance bromine water turns from orange to colourless when added to an alkene.
烯烃是不饱和烃，含至少一个 C=C 双键，通式 CₙH₂ₙ。它们可发生加成反应，例如使溴水由橙黄色褪为无色。
Alcohols contain the –OH functional group. Ethanol can be produced by fermentation of sugars or by hydration of ethene. Carboxylic acids contain the –COOH group; ethanoic acid is the main acid in vinegar.
醇含有 –OH 官能团。乙醇可通过糖类发酵或乙烯水合法制取。羧酸含 –COOH 基团，乙酸是食醋的主要酸性成分。
Polymers are long chains formed by joining many small monomer units. Addition polymerisation occurs when alkene monomers open their double bonds: poly(ethene), poly(propene) are common plastics.
聚合物是由大量小分子单体连接而成的长链。烯烃单体打开双键发生加聚反应，常见塑料有聚乙烯、聚丙烯等。
Nylon and proteins are examples of condensation polymers, formed with the elimination of a small molecule such as water.
尼龙和蛋白质属于缩合聚合物，形成时会脱去水等小分子。
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