IGCSE CCEA Chemistry: End-of-Term Revision Checklist | IGCSE CCEA 化学期末复习提纲

📚 IGCSE CCEA Chemistry: End-of-Term Revision Checklist | IGCSE CCEA 化学期末复习提纲

This revision checklist is designed for IGCSE CCEA Chemistry students to consolidate key concepts before the end-of-term examination. It summarises essential topics, definitions, equations, and practical skills required by the specification. Work through each section systematically and use past paper questions to test your understanding.

本复习提纲针对 IGCSE CCEA 化学课程设计，帮助同学们在期末考试前梳理关键概念。它汇总了考纲要求的重要主题、定义、方程式及实验技能。请按部就班复习每个部分，并结合历年真题检验理解。

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

Atoms are the smallest particles of an element and consist of a central nucleus containing protons and neutrons, surrounded by electrons arranged in energy levels (shells).

原子是元素最小的粒子，由含质子和中子的中心原子核以及排布在能级（电子层）中的电子组成。

Protons have a relative mass of 1 and a charge of +1; neutrons have a mass of 1 and no charge; electrons have a negligible mass (about 1/1836) and a charge of –1.

质子相对质量约为 1，带一个单位正电荷；中子相对质量约为 1，不带电；电子质量极小（约 1/1836），带一个单位负电荷。

Atomic number (Z) equals the number of protons and defines the element, while mass number (A) is the total number of protons and neutrons. Isotopes are atoms of the same element with the same number of protons but different numbers of neutrons.

原子序数（Z）等于质子数，决定了元素种类；质量数（A）为质子数与中子数之和。同位素是指质子数相同而中子数不同的同种元素的原子。

Electrons fill shells according to the 2,8,8 rule: the first shell holds up to 2 electrons, the second and third hold up to 8. The electron configuration determines the chemical properties of an element.

电子按 2、8、8 规则排布：第一层最多容纳 2 个电子，第二、三层最多容纳 8 个电子。电子排布决定了元素的化学性质。

In the Periodic Table, horizontal rows are periods and vertical columns are groups. Elements in the same group have the same number of outer-shell electrons, leading to similar chemical behaviour.

在元素周期表中，横行称为周期，纵列称为族。同一族元素最外层电子数相同，因此化学性质相似。

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2. Bonding and Structure | 化学键与结构

Ionic bonding involves the transfer of electrons from a metal to a non-metal, forming positive cations and negative anions held together by strong electrostatic forces. The resulting ionic compounds form giant ionic lattices with high melting points and conduct electricity when molten or dissolved in water because the ions are free to move.

离子键涉及电子从金属向非金属的转移，形成正离子和负离子，通过强静电吸引力结合。离子化合物形成巨型离子晶格，熔、沸点较高，在熔融或溶于水时因离子可自由移动而导电。

Covalent bonding occurs when non-metal atoms share pairs of electrons to achieve a full outer shell. Simple molecular substances have low melting and boiling points and do not conduct electricity. Giant covalent structures (such as diamond and silicon dioxide) have very high melting points and are typically hard.

共价键由非金属原子间共用电子对形成，以达到满壳层结构。简单分子物质熔、沸点低，不导电。巨型共价结构（如金刚石和二氧化硅）具有很高的熔点和硬度。

Metallic bonding is the electrostatic attraction between positively charged metal ions and a sea of delocalised electrons. This model explains why metals are good conductors of heat and electricity and are malleable and ductile.

金属键是带正电的金属离子与离域电子“海”之间的静电吸引力。该模型解释了金属为什么能导热、导电，并具有延展性和可塑性。

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3. Chemical Equations and Quantities | 化学方程式与计量

All chemical equations must be balanced, showing the same number of atoms of each element on both sides. State symbols (s), (l), (g) and (aq) indicate the physical states of substances.

所有化学方程式必须配平，显示每种元素在反应物和生成物中原子数目相等。状态符号 (s)、(l)、(g)、(aq) 表示物质的状态。

Relative atomic mass (Aᵣ) is the average mass of an atom relative to ¹⁄₁₂ of the mass of a carbon‑12 atom. Relative formula mass (Mᵣ) is the sum of the relative atomic masses of all atoms in the formula.

相对原子质量（Aᵣ）是原子平均质量相对于碳‑12 原子质量的 1/12。相对式量（Mᵣ）为化学式中所有原子的相对原子质量之和。

moles = mass ÷ molar mass

物质的量 = 质量 ÷ 摩尔质量

At room temperature and pressure (rtp), one mole of any gas occupies a volume of 24 dm³. Use this relationship to calculate the volume of gases produced in reactions.

在室温和常压下，1 mol 任何气体的体积约为 24 dm³。利用此关系可以计算反应生成气体的体积。

Concentration of a solution is measured in mol/dm³ and is calculated as moles of solute ÷ volume of solution (in dm³). Percentage yield compares the actual yield to the theoretical yield.

溶液浓度的单位为 mol/dm³，计算公式为溶质的物质的量 ÷ 溶液体积（dm³）。百分产率用于比较实际产量与理论产量。

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4. Acids, Bases and Salts | 酸、碱和盐

An acid is a substance that releases hydrogen ions (H⁺) in aqueous solution. A base is a metal oxide or hydroxide that neutralises an acid; an alkali is a soluble base that releases hydroxide ions (OH⁻).

酸是在水溶液中释放氢离子（H⁺）的物质。碱是能中和酸的金属氧化物或氢氧化物；可溶性碱称为碱，释放氢氧根离子（OH⁻）。

The pH scale ranges from 0 (strongly acidic) to 14 (strongly alkaline), with 7 being neutral. Neutralisation reactions produce a salt and water.

pH 标度从 0（强酸性）到 14（强碱性），7 为中性。中和反应生成盐和水。

Common laboratory acids are hydrochloric acid (HCl), sulfuric acid (H₂SO₄) and nitric acid (HNO₃). Salts are prepared by several methods including: titration (for soluble salts of reactive metals or alkalis), reaction of a metal with an acid, and precipitation (for insoluble salts).

常见实验室用酸有盐酸（HCl）、硫酸（H₂SO₄）和硝酸（HNO₃）。盐可通过多种方法制备：滴定法（制备活泼金属或碱的可溶盐）、金属与酸反应以及沉淀法（制不溶盐）。

Gas tests must be known: hydrogen pops with a lighted splint; oxygen relights a glowing splint; carbon dioxide turns limewater milky; chlorine bleaches damp litmus paper; ammonia turns damp red litmus blue.

必须掌握气体检验：氢气遇点燃的木条发生爆鸣；氧气使带火星的木条复燃；二氧化碳使石灰水变浑浊；氯气漂白湿润的石蕊试纸；氨气使湿润的红色石蕊试纸变蓝。

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5. The Periodic Table: Group Trends | 元素周期表：族趋势

Group 1 (alkali metals) are highly reactive metals. Their reactivity increases down the group. They react vigorously with water to produce a metal hydroxide and hydrogen gas. For example: 2Na + 2H₂O → 2NaOH + H₂↑.

第 1 族（碱金属）是极活泼的金属，活泼性自上而下递增。它们与水剧烈反应生成金属氢氧化物和氢气，例如：2Na + 2H₂O → 2NaOH + H₂↑。

Group 7 (halogens) exist as diatomic molecules. Reactivity decreases down the group. A more reactive halogen displaces a less reactive halide ion from its salt solution. For instance: Cl₂ + 2KBr → 2KCl + Br₂.

第 7 族（卤素）以双原子分子形式存在，活泼性自上而下递减。较活泼的卤素能从卤化物盐溶液中置换出较不活泼的卤素离子，例如：Cl₂ + 2KBr → 2KCl + Br₂。

Group 0 (noble gases) are monatomic and chemically unreactive because their atoms have full outer electron shells. They find uses in lighting, helium balloons and as inert atmospheres.

第 0 族（稀有气体）以单原子分子存在，化学性质不活泼，因为其原子具有全满的最外层电子。它们用于照明、充氦气球以及作为保护气氛。

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6. Metals and Reactivity | 金属与反应性

The reactivity series lists metals in order of their tendency to form positive ions. Potassium, sodium and calcium are most reactive, while gold and platinum are least reactive. The method of metal extraction depends on the metal’s position in the series.

金属活动性顺序按金属形成正离子的倾向排列。钾、钠、钙最活泼，金、铂最不活泼。金属的提取方法取决于其在活动性顺序中的位置。

Metals above carbon in the reactivity series are extracted by electrolysis (e.g. aluminium from molten aluminium oxide). Metals below carbon can be extracted by reduction with carbon, for example iron from iron(III) oxide in the blast furnace.

活动性高于碳的金属通过电解法提取（如电解熔融氧化铝制铝）。活动性低于碳的金属可用碳还原提取，例如高炉中用一氧化碳还原氧化铁获得铁。

Alloys are mixtures of a metal with other elements, designed to improve properties such as strength or resistance to corrosion. Common alloys include steel (iron with carbon) and brass (copper with zinc).

合金是金属与其他元素组成的混合物，旨在改善强度或抗腐蚀性能。常见合金有钢（铁与碳）和黄铜（铜与锌）。

Rusting of iron requires both oxygen and water. Prevention methods include painting, oiling, galvanising (coating with zinc) and sacrificial protection.

铁生锈需要氧气和水同时存在。防锈方法包括涂漆、涂油、镀锌（热浸锌）以及牺牲性保护。

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7. Electrochemistry | 电化学

Electrolysis is the decomposition of an ionic compound by passing direct electric current through its molten state or solution. The positive cathode attracts cations, which gain electrons (reduction). The negative anode attracts anions, which lose electrons (oxidation).

电解是通直流电使熔融或溶液中的离子化合物分解的过程。正极（阴极）吸引阳离子，阳离子得电子（还原）；负极（阳极）吸引阴离子，阴离子失电子（氧化）。

In the electrolysis of molten lead(II) bromide, brown bromine gas forms at the anode and grey lead metal deposits at the cathode. In aqueous solutions, the discharge of ions depends on the reactivity series and concentration. For example, electrolysis of brine (concentrated NaCl solution) produces chlorine gas at the anode, hydrogen gas at the cathode, and sodium hydroxide in solution.

电解熔融溴化铅时，阳极产生红棕色溴气，阴极析出灰色金属铅。在溶液中，离子的放电顺序取决于金属活动性顺序和浓度。例如，电解浓食盐水（NaCl 溶液）时，阳极产生氯气，阴极产生氢气，溶液中留下氢氧化钠。

Half equations show the electron transfer. At the cathode, Cu²⁺ + 2e⁻ → Cu; at the anode, 2Cl⁻ → Cl₂ + 2e⁻. Electroplating uses electrolysis to coat a metal object with a thin layer of another metal for protection or decoration.

半反应式表示电子转移。阴极：Cu²⁺ + 2e⁻ → Cu；阳极：2Cl⁻ → Cl₂ + 2e⁻。电镀利用电解在金属表面镀上一层薄薄的另一金属，起保护或装饰作用。

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8. Energy Changes in Reactions | 反应中的能量变化

Exothermic reactions release heat energy to the surroundings, raising the temperature. Examples include combustion, neutralisation and respiration. Endothermic reactions absorb heat, causing a temperature drop; examples include thermal decomposition and photosynthesis.

放热反应向周围环境释放热能，使温度升高，例如燃烧、中和反应及呼吸作用。吸热反应吸收热量，导致温度下降，例如热分解和光合作用。

Energy level diagrams show the relative energies of reactants and products. In an exothermic reaction, products have lower energy; in an endothermic reaction, products have higher energy. The activation energy is the minimum energy required for a reaction to occur.

能级图表示反应物和生成物的相对能量。放热反应中生成物能量更低，吸热反应中生成物能量更高。活化能是发生反应所需的最低能量。

Bond breaking is endothermic; bond making is exothermic. The overall enthalpy change (ΔH) can be calculated using bond energies:

ΔH = Σ (bond energies of bonds broken) – Σ (bond energies of bonds formed)

化学键断裂是吸热过程，化学键形成是放热过程。总焓变（ΔH）可利用键能计算：

ΔH = Σ (断裂键的键能总和) – Σ (形成键的键能总和)

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9. Organic Chemistry | 有机化学

Organic compounds are based on carbon. Homologous series are families of compounds with the same functional group and general formula. Alkanes (CₙH₂ₙ₊₂) are saturated hydrocarbons; alkenes (CₙH₂ₙ) are unsaturated and contain a C=C double bond. Alcohols (–OH) and carboxylic acids (–COOH) are important functional group series.

有机化合物以碳为基础。同系物是具有相同官能团和通式的一类化合物。烷烃（CₙH₂ₙ₊₂）是饱和烃；烯烃（CₙH₂ₙ）是不饱和烃，含 C=C 双键。醇（–OH）和羧酸（–COOH）是重要的官能团系列。

Naming follows IUPAC rules: meth-, eth-, prop-, but- indicate the number of carbon atoms. Displayed and structural formulae should be used to represent molecules.

命名遵循 IUPAC 规则：甲、乙、丙、丁表示碳原子数目。应使用结构式和示性式表示分子。

Alkenes undergo addition reactions; bromine water turns colourless when added to an alkene, a test for unsaturation. Alcohols can be oxidised to carboxylic acids using acidified potassium dichromate. Carboxylic acids react with alcohols to form esters (e.g. ethyl ethanoate) in a condensation reaction.

烯烃可发生加成反应；加入溴水后褪色可用于检验不饱和性。醇可用酸化重铬酸钾氧化为羧酸。羧酸与醇发生酯化反应（缩合反应）生成酯（如乙酸乙酯）。

Addition polymerisation converts many small alkene monomers into a long polymer chain, such as poly(ethene) and poly(chloroethene) (PVC). The repeat unit shows the polymer’s structure.

加聚反应将许多小分子烯烃单体连接成长链聚合物，如聚乙烯和聚氯乙烯（PVC）。重复单元表示聚合物结构。

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10. Practical Skills and Analysis | 实验技能与分析

Separation techniques include filtration (for insoluble solids from liquids), crystallisation (to obtain pure soluble salts), simple distillation (to separate a solvent from a solution), fractional distillation (to separate miscible liquids with different boiling points), and paper chromatography (to separate mixtures of coloured substances or dyes).

分离技术包括：过滤（用于不溶性固体与液体的分离）、结晶（获得纯净的可溶盐）、简单蒸馏（分离溶剂与溶液）、分馏（分离沸点不同的互溶液体）以及纸色谱（分离色素或混合染料）。

Rf value = distance moved by spot ÷ distance moved by solvent front. It is used for identification in chromatography.

Rf 值 = 斑点移动距离 ÷ 溶剂前沿移动距离

Qualitative analysis involves cation and anion tests. Flame tests identify metal ions: Li⁺ red, Na⁺ yellow, K⁺ lilac, Ca²⁺ brick red, Cu²⁺ green‑blue. Sodium hydroxide solution is used to identify cations through precipitate colours; for example, Cu²⁺ gives a blue precipitate, Fe²⁺ green, Fe³⁺ brown.

定性分析包括阳离子和阴离子检验。焰色试验可鉴别金属离子：Li⁺ 红色，Na⁺ 黄色，K⁺ 淡紫色，Ca²⁺砖红色，Cu²⁺ 蓝绿色。氢氧化钠溶液用于鉴定阳离子，产生不同颜色的沉淀：Cu²⁺ 蓝色沉淀，Fe²⁺ 绿色，Fe³⁺ 红褐色。

Anion tests: add dilute nitric acid and then silver nitrate solution to test for halides (Cl⁻ white precipitate, Br⁻ cream, I⁻ yellow); add dilute hydrochloric acid and then barium chloride solution to test for sulfate ions (SO₄²⁻, white precipitate); add dilute acid to test for carbonate ions (CO₃²⁻, effervescence of CO₂).

阴离子检验：先加稀硝酸再加硝酸银溶液检验卤离子（Cl⁻ 白色沉淀，Br⁻ 淡黄色，I⁻ 黄色）；先加稀盐酸再加氯化钡溶液检验硫酸根离子（SO₄²⁻，白色沉淀）；加稀酸检验碳酸根离子（CO₃²⁻，放出 CO₂ 气泡）。

Collecting gases: displacement of water for insoluble gases (e.g. H₂, O₂, CO₂), upward delivery for gases denser than air (e.g. Cl₂, HCl), downward delivery for gases less dense than air (e.g. H₂, NH₃). The choice of apparatus depends on the gas’s density and solubility.

气体收集方法：排水集气法适用于难溶于水的气体（如 H₂、O₂、CO₂）；向上排空气法适用于比空气重的气体（如 Cl₂、HCl）；向下排空气法适用于比空气轻的气体（如 H₂、NH₃）。收集装置的选择取决于气体的密度和溶解性。

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