📚 Core Knowledge Review for Year 10 Cambridge Chemistry | Year 10 Cambridge 化学：核心知识点梳理
This comprehensive guide unpacks the most important topics in the Year 10 Cambridge Chemistry curriculum. Building a solid foundation at this stage is crucial for success in IGCSE or O Level examinations, as well as for future studies in the sciences. Each section provides clear explanations, key definitions, and useful comparisons to help you master the core content.
这份综合指南梳理了剑桥 Year 10 化学课程中最重要的知识点。在这个阶段打好坚实基础，对 IGCSE 或 O Level 考试的成功以及未来的科学学习都至关重要。每个章节都提供了清晰的解释、关键定义和实用对比，帮助你掌握核心内容。
1. Atomic Structure and the Periodic Table | 原子结构与周期表
All matter is composed of atoms. Each atom contains a central nucleus made up of protons (positive charge) and neutrons (no charge), with electrons (negative charge) arranged in shells or energy levels around the nucleus.
所有物质都由原子构成。每个原子包含由质子（带正电荷）和中子（不带电荷）组成的中心原子核，电子（带负电荷）分层（能级）排布在原子核外。
The atomic number (Z) is the number of protons, which defines the element. The 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）是质子数，它决定了元素的种类。质量数（A）是质子和中子的总数。同位素指质子数相同而中子数不同的同一元素的不同原子。
Electrons occupy shells according to the 2, 8, 8, 2 rule for the first 20 elements. The electronic configuration determines an element's chemical properties and its position in the Periodic Table.
对于前20号元素，电子按照2、8、8、2的顺序填充在电子层中。电子排布决定了元素的化学性质及其在周期表中的位置。
The Periodic Table arranges elements in order of increasing atomic number. Vertical columns are called groups; elements in the same group have the same number of outer‑shell electrons and similar chemical behaviour. Horizontal rows are periods; moving across a period, the number of outer electrons increases.
周期表按原子序数递增的顺序排列元素。纵列称为族；同一族元素的最外层电子数相同，化学性质相似。横行称为周期；同周期元素从左到右最外层电子数递增。
Metals are on the left and centre, non‑metals on the right. Group 1 elements are the alkali metals, Group 7 the halogens, and Group 0 (or 8) the noble gases, which are unreactive due to having full outer shells.
金属位于左侧和中部，非金属在右侧。第1族是碱金属，第7族是卤素，第0族（或第8族）是稀有气体，它们因最外层电子已满而化学性质稳定。
2. Chemical Bonding: Ionic, Covalent, and Metallic | 化学键：离子键、共价键与金属键
Chemical bonding involves the transfer or sharing of electrons, allowing atoms to achieve a full outer shell (noble gas configuration). The three main bond types give substances very different properties.
化学键涉及电子的转移或共用，使原子达到稳定结构（稀有气体电子排布）。三种主要化学键类型赋予物质截然不同的性质。
Ionic bonding occurs between metals and non‑metals. Metal atoms lose electrons to form positive ions (cations), while non‑metal atoms gain electrons to form negative ions (anions). The oppositely charged ions are held together by strong electrostatic forces in a giant ionic lattice. Ionic compounds have high melting and boiling points, are often soluble in water, and conduct electricity when molten or dissolved in water because the ions are free to move.
离子键通常在金属和非金属之间形成。金属原子失去电子形成正离子（阳离子），非金属原子得到电子形成负离子（阴离子）。带相反电荷的离子通过强烈的静电引力形成巨型离子晶格。离子化合物具有高熔点和高沸点，通常可溶于水，并且在熔融或溶于水时能够导电，因为此时离子可以自由移动。
Covalent bonding typically occurs between non‑metal atoms. Electrons are shared to form molecules or giant covalent structures. Simple molecular substances (e.g., H₂O, CO₂, O₂) have weak intermolecular forces, resulting in low melting and boiling points. Giant covalent structures (e.g., diamond, graphite, SiO₂) have networks of strong covalent bonds, leading to very high melting points and variable electrical conductivity – graphite conducts electricity due to delocalised electrons, whereas diamond does not.
共价键通常存在于非金属原子之间。通过共用电子形成分子或巨型共价结构。简单分子物质（如 H₂O、CO₂、O₂）分子间作用力弱，因此熔点和沸点低。巨型共价结构（如金刚石、石墨、SiO₂）具有连续的强共价键网络，熔点极高，并且导电性各不相同——石墨因含有离域电子而导电，金刚石则不导电。
Metallic bonding is found in metals. Positive metal ions are arranged in a regular lattice, surrounded by a 'sea' of delocalised electrons. This structure explains the high electrical and thermal conductivity, malleability, and ductility of metals. Alloys are mixtures of metals that disrupt the regular lattice, making them harder than pure metals.
金属键存在于金属中。正金属离子规则排列在晶格中，被“电子海”般的离域电子包围。这种结构解释了金属的高导电性、高导热性、延展性和可塑性。合金是金属的混合物，会扰乱规则的晶格，使合金比纯金属更硬。
3. Stoichiometry and the Mole Concept | 化学计量学与摩尔概念
or amount of substance. One mole of any substance contains 6.02 × 10²³ particles (Avogadro's constant).
化学计量学是对化学反应中反应物和产物的定量研究。摩尔是物质的量的单位。1摩尔的任何物质含有 6.02 × 10²³ 个粒子（阿伏伽德罗常数）。
mula mass (Mᵣ). You can calculate the number of moles using the formula: n = m / M, where m is mass in grams.
物质的摩尔质量（M）是1摩尔该物质的质量（以克为单位），数值上等于相对原子质量（Aᵣ）或相对配方质量（Mᵣ）。可以使用公式 n = m / M 计算摩尔数，其中 m 是质量（克）。
Number of moles = Mass (g) / Molar mass (g mol⁻¹)
摩尔数 = 质量 (g) / 摩尔质量 (g mol⁻¹)
Balanced chemical equations show the mole ratios between reactants and products. Using these ratios, you can predict the masses of products formed or reactants consumed. For gases, 1 mole of any gas occupies 24 dm³ at room temperature and pressure (rtp), which allows volume calculations.
平衡的化学方程式体现了反应物和生成物之间的摩尔比。利用这些比例，可以预测生成物的质量或反应物的消耗量。对于气体，在室温和常压下（rtp），1摩尔任何气体的体积为 24 dm³，这使得我们可以进行体积计算。
Percentage yield and percentage purity calculations are important for assessing reaction efficiency and sample quality. Empirical formula gives the simplest whole‑number ratio of atoms in a compound, while molecular formula indicates the actual number of atoms.
产率和纯度的百分数计算对于评估反应效率和样品质量很重要。实验式（最简式）给出化合物中各元素原子个数的最简整数比，而分子式表示原子的实际数目。
4. States of Matter and Kinetic Theory | 物质状态与分子运动论
The kinetic particle model describes how particles are arranged, move, and interact in solids, liquids, and gases. The energy and spacing of particles determine the physical properties of each state.
分子运动论描述了粒子在固态、液态和气态中的排列方式、运动状态以及相互作用。粒子的能量和间距决定了每种状态的物理性质。
In solids, particles are held in fixed positions by strong forces, vibrating in place. This gives solids a definite shape and volume. Liquids have particles that are still in contact but can slide past one another, allowing liquids to flow and take the shape of their container. In gases, particles move rapidly in all directions with large spaces between them; gases have no fixed shape or volume and are easily compressed.
在固态中，粒子被强大的作用力固定在位置上，只能在原位振动。因此固体具有固定的形状和体积。液态中粒子仍保持接触，但能够相互滑动，使得液体可以流动并形成容器的形状。在气态中，粒子向各个方向快速运动，彼此间距很大；气体没有固定的形状和体积，且容易被压缩。
Changes of state – melting, boiling, freezing, condensation, sublimation – involve energy transfers without a change in temperature. During melting and boiling, heat energy is absorbed to overcome attractive forces; this is represented by horizontal sections on a heating curve.
状态的变化——熔化、沸腾、凝固、冷凝、升华——涉及能量传递而温度不变。在熔化和沸腾过程中，物质吸收热量来克服粒子间的吸引力；这在加热曲线上表现为水平线段。
Diffusion is the net movement of particles from an area of higher concentration to an area of lower concentration. Diffusion occurs most rapidly in gases, slower in liquids, and is influenced by temperature and particle mass. Lighter particles diffuse faster at a given temperature.
扩散是指粒子从高浓度区域向低浓度区域的净移动。扩散在气体中最快，液体中较慢，并且受温度和粒子质量的影响。在相同温度下，质量较小的粒子扩散更快。
5. Acids, Bases and Salts | 酸、碱和盐
An acid is a substance that produces hydrogen ions (H⁺) in aqueous solution. Common laboratory acids include hydrochloric acid (HCl), sulfuric acid (H₂SO₄) and nitric acid (HNO₃). Acids have a pH less than 7 and turn blue litmus red.
酸是能在水溶液中产生氢离子（H⁺）的物质。实验室常用的酸有盐酸（HCl）、硫酸（H₂SO₄）和硝酸（HNO₃）。酸的 pH 小于 7，能使蓝色石蕊试纸变红。
A base is any substance that neutralises an acid to form a salt and water. An alkali is a soluble base that releases hydroxide ions (OH⁻) in water. Alkalis have a pH greater than 7 and turn red litmus blue. Common alkalis include sodium hydroxide (NaOH) and potassium hydroxide (KOH).
碱是任何能够与酸发生中和反应生成盐和水的物质。可溶性碱被称为“硷”，它在水中会释放氢氧根离子（OH⁻）。硷的 pH 大于 7，能使红色石蕊试纸变蓝。常见的硷包括氢氧化钠（NaOH）和氢氧化钾（KOH）。
). The reaction between an acid and a metal oxide or carbonate also produces a salt and water, but with carbonates carbon dioxide gas is also evolved.
中和反应可用方程式表示：H⁺(aq) + OH⁻(aq) → H₂O(l)。酸与金属氧化物或碳酸盐的反应也会生成盐和水，但碳酸盐反应还会产生二氧化碳气体。
Salts are ionic compounds formed when the hydrogen ion of an acid is replaced by a metal ion or ammonium ion. Methods to prepare soluble salts include: acid + metal, acid + insoluble base, acid + soluble base (titration). Insoluble salts can be prepared by precipitation, mixing two soluble salts that form an insoluble product.
盐是由酸中的氢离子被金属离子或铵离子取代后形成的离子化合物。制备可溶性盐的方法包括：酸+金属、酸+不溶性碱、酸+可溶性碱（滴定）。不溶性盐可以通过沉淀法制备，即混合两种能形成不溶性产物的可溶盐。
The pH scale (0‑14) measures acidity or alkalinity. Universal indicator gives a range of colours across the scale. Strong acids and alkalis are fully ionised in water, while weak acids/alkalis are only partially ionised.
pH 标度（0‑14）用于衡量酸碱度。通用指示剂在整个 pH 范围内显示不同的颜色。强酸和强硷在水中完全电离，而弱酸和弱硷仅部分电离。
6. Redox Reactions and Electrochemistry | 氧化还原反应与电化学
Oxidation originally meant gain of oxygen or loss of hydrogen; reduction meant loss of oxygen or gain of hydrogen. In terms of electron transfer, oxidation is the loss of electrons, and reduction is the gain of electrons – remembered by OIL RIG (Oxidation Is Loss, Reduction Is Gain).
氧化最初指得到氧或失去氢；还原指失去氧或得到氢。从电子转移的角度，氧化是失去电子，还原是得到电子——可记为“氧失还得”（氧化失电子，还原得电子）。
epting electrons, and is itself reduced. A reducing agent (reductant) donates electrons and is itself oxidised. For example, in the reaction between magnesium and oxygen: Mg → Mg²⁺ + 2e⁻ (oxidation), O₂ + 4e⁻ → 2O²⁻ (reduction).
氧化还原反应总是同时发生氧化和还原过程。氧化剂通过接受电子引起氧化，本身被还原。还原剂提供电子，本身被氧化。例如，镁和氧气的反应中：Mg → Mg²⁺ + 2e⁻（氧化），O₂ + 4e⁻ → 2O²⁻（还原）。
Electrolysis is the process of using direct current to drive a non‑spontaneous chemical reaction. In an electrolytic cell, the positive anode attracts anions and oxidation occurs there; the negative cathode attracts cations and reduction occurs. During the electrolysis of molten ionic compounds, the metal is produced at the cathode and the non‑metal at the anode. In aqueous solutions, water can also be discharged, so the products depend on the reactivity of the ions and concentration.
电解是利用直流电驱动非自发的化学反应的过程。在电解池中，正极的阳极吸引阴离子，发生氧化反应；负极的阴极吸引阳离子，发生还原反应。电解熔融离子化合物时，阴极生成金属，阳极生成非金属。在水溶液中，水也可能参与放电，因此产物取决于离子的反应活性和浓度。
Applications of electrolysis include extraction of aluminium from its ore, purification of copper, and electroplating. In simple cells, chemical energy is converted to electrical energy through redox reactions; two different metals in contact with an electrolyte produce a voltage.
电解的应用包括从矿石中提取铝、精炼铜以及电镀。在原电池中，化学能通过氧化还原反应转化为电能；两种不同金属与电解质接触就会产生电压。
7. Energetics and Reaction Rates | 能量学与反应速率
Chemical reactions involve energy changes. Exothermic reactions release thermal energy to the surroundings, causing a temperature increase (e.g., combustion, neutralisation). Endothermic reactions absorb energy from the surroundings, leading to a temperature decrease (e.g., thermal decomposition, photosynthesis).
化学反应伴随能量变化。放热反应向环境释放热能，导致温度升高（如燃烧、中和反应）。吸热反应从环境吸收能量，导致温度降低（如热分解、光合作用）。
The enthalpy change (ΔH) for exothermic reactions is negative, and for endothermic reactions it is positive. Energy level diagrams or reaction profile diagrams illustrate the relative energies of reactants and products, and show the activation energy (Eₐ) – the minimum energy needed for a reaction to occur.
放热反应的焓变（ΔH）为负值，吸热反应为正值。能级图或反应历程图显示了反应物和生成物的相对能量，并标出活化能（Eₐ）——反应发生所需的最低能量。
The rate of a chemical reaction can be measured by monitoring the speed at which a reactant is used up or a product is formed. According to collision theory, particles must collide with sufficient energy (greater than or equal to Eₐ) and with correct orientation for a reaction to take place.
化学反应速率可以通过监测反应物消耗或产物生成的速度来衡量。根据碰撞理论，粒子必须以足够的能量（≥ Eₐ）和正确的取向发生碰撞，反应才会发生。
Factors that increase the rate of reaction:
- Temperature – particles move faster, collide more frequently and with greater energy, so more collisions exceed the activation energy.
- Concentration (solutions) / Pressure (gases) – more particles per unit volume increases the frequency of collisions.
- Surface area (solids) – smaller particle size increases the area exposed, allowing more collisions.
- Catalysts – provide an alternative reaction pathway with lower activation energy, increasing the proportion of successful collisions without being used up.
提高反应速率的因素：
- 温度——粒子运动加快，碰撞更频繁且能量更高，因此更多碰撞能达到活化能。
- 浓度（溶液）/ 压强（气体）——单位体积内粒子数增多，碰撞频率增大。
- 表面积（固体）——颗粒越小，暴露的面积越大，碰撞机会更多。
- 催化剂——提供一条活化能更低的替代反应路径，提高有效碰撞的比例，而自身并不消耗。
8. Organic Chemistry: Alkanes, Alkenes and Functional Groups | 有机化学：烷烃、烯烃与官能团
Organic chemistry studies carbon‑based compounds. Hydrocarbons are compounds containing only carbon and hydrogen. Saturated hydrocarbons (alkanes) have only single C–C bonds; the general formula is CₙH₂ₙ₊₂. The first four alkanes are methane (CH₄), ethane (C₂H₆), propane (C₃H₈) and butane (C₄H₁₀).
有机化学研究碳基化合物。碳氢化合物是只含碳和氢的有机物。饱和烃（烷烃）只含碳‑碳单键；通式为 CₙH₂ₙ₊₂。前四种烷烃为甲烷（CH₄）、乙烷（C₂H₆）、丙烷（C₃H₈）和丁烷（C₄H₁₀）。
Alkanes are generally unreactive but undergo complete combustion in excess oxygen to produce carbon dioxide and water, releasing useful energy. They can also react with halogens in substitution reactions, where a hydrogen atom is replaced by a halogen atom in the presence of UV light.
烷烃通常化学性质稳定，但在充足氧气中能完全燃烧，生成二氧化碳和水，并释放大量能量。它们还能在紫外光照下与卤素发生取代反应，此时烷烃中的一个氢原子被卤素原子取代。
Unsaturated hydrocarbons (alkenes) contain at least one carbon‑ neral formula CₙH₂ₙ. Ethene (C₂H₄) is the simplest member. The double bond makes alkenes much more reactive than alkanes. They undergo addition reactions across the double bond: with hydrogen (hydrogenation), with halogens (halogenation), with steam (hydration to form alcohols), and with themselves (polymerisation).
不饱和烃（烯烃）含有至少一个碳‑碳双键（C=C），通式为 CₙH₂ₙ。乙烯（C₂H₄）是最简单的烯烃。双键使烯烃的反应活性远高于烷烃。它们可以发生加成反应：与氢气（加氢）、与卤素（卤化）、与水蒸气（水化生成醇）以及自身加成（聚合反应）。
Functional groups are atoms or groups of atoms that determine the characteristic reactions of organic compounds. Key functional groups for Year 10 include –OH (alcohols, e.g., ethanol C₂H₅OH) and –COOH (carboxylic acids, e.g., ethanoic acid CH₃COOH). Alcohols can be produced by fermentation of sugars or by hydration of ethene. Carboxylic acids are weak acids and react similarly to mineral acids in neutralisation.
官能团是决定有机化合物特征反应的原子或原子团。Year 10 需要掌握的关键官能团包括 –OH（醇类，如乙醇 C₂H₅OH）和 –COOH（羧酸类，如乙酸 CH₃COOH）。醇可通过糖类的发酵或乙烯的水化来制备。羧酸是弱酸，在中和反应中与无机酸表现相似。
9. Chemical Analysis and Experimental Techniques | 化学分析与实验技术
Purity of substances is assessed by measuring melting and boiling points. A pure substance has a sharp, fixed melting point, whereas an impure substance melts over a range of temperatures and usually at a lower temperature than the pure compound.
物质的纯度可通过熔点和沸点的测定进行评估。纯净物具有敏锐、固定的熔点，而不纯的物质则在一个温度范围内熔化，且熔点通常低于纯净物。
Separation techniques exploit differences in physical properties. Filtration separates an insoluble solid from a liquid. Evaporation and crystallisation obtain a dissolved solid from a solution. Simple distillation separates a solvent from a solution with a much higher boiling point, while fractional distillation separates a mixture of miscible liquids with close boiling points, such as crude oil fractions or ethanol‑water mixtures.
分离技术利用了物质物理性质的差异。过滤用于将不溶性固体与液体分开。蒸发和结晶用于从溶液中提取溶解的固体。简单蒸馏可将溶剂与沸点高得多的溶液分离，而分馏则用于分离沸点相近的混溶液体混合物，例如原油馏分或乙醇‑水混合物。
Chromatography is used to separate mixtures of coloured or colourless substances. In paper chromatography, the mixture is spotted on a stationary phase (paper) and a solvent (mobile phase) moves up. Substances separate according to their relative affinity for the two phases, characterised by the Rf value (distance moved by substance / distance moved by solvent).
色谱法用于分离有色或无色物质的混合物。在纸色谱法中，混合物点在固定相（滤纸）上，溶剂（流动相）向上移动。物质根据对两相的相对亲和力而分离，用 Rf 值（物质移动距离 / 溶剂移动距离）来表征。
Titration is a quantitative technique to determine the concentration of an acid or alkali. A standard solution of known concentration is added from a burette to a measured volume of the unknown solution until neutralisation is reached, usually indicated by a colour change of an indicator. The titre volume allows concentration calculation using the mole ratio from the balanced equation.
滴定是一种测定酸或碱浓度的定量技术。将已知浓度的标准溶液从滴定管滴加到定量的待测溶液中，直到中和终点，通常由指示剂的颜色变化显示。消耗的滴定体积可用于通过平衡方程式的摩尔比计算浓度。
10. Environmental Chemistry and Sustainability | 环境化学与可持续发展
Combustion of fossil fuels releases carbon dioxide (CO₂), a greenhouse gas that contributes to global warming by trapping infrared radiation in the atmosphere. Other greenhouse gases include methane (CH₄) and water vapour. Enhanced greenhouse effect leads to climate change, rising sea levels, and extreme weather.
化石燃料的燃烧释放二氧化碳（CO₂），这是一种温室气体，它通过捕获大气中的红外辐射导致全球变暖。其他温室气体包括甲烷（CH₄）和水蒸气。增强的温室效应会引起气候变化、海平面上升和极端天气。
Acid rain is formed when sulfur dioxide (SO₂) and nitrogen oxides (NOₓ) from industrial emissions dissolve in rainwater. SO₂ mainly comes from burning fossil fuels containing sulfur impurities, while NOₓ are produced in high‑temperature combustion engines. Acid rain damages forests, aquatic life, and stone buildings. Catalytic converters in vehicles reduce NOₓ emissions, and flue gas desulfurisation removes SO₂ from power station emissions.
酸雨是由工业排放的二氧化硫（SO₂）和氮氧化物（NOₓ）溶解在雨水中形成的。SO₂ 主要来源于含硫杂质化石燃料的燃烧，而 NOₓ 产生于高温内燃机中。酸雨破坏森林、水生生物和石质建筑。车辆中的催化转化器可减少 NOₓ 排放，烟气脱硫则去除了发电站排放中的 SO₂。
Water pollution from fertilisers can cause eutrophication. Excess nitrates and phosphates wash into rivers and lakes, promoting rapid algae growth. When the algae die and decompose, the process consumes dissolved oxygen, leading to the death of fish and other aquatic organisms. Proper treatment of sewage and agricultural runoff is essential.
肥料造成的水体污染可引发富营养化。过量的硝酸盐和磷酸盐被冲入河流湖泊，促使藻类快速生长。藻类死亡分解时消耗水中的溶解氧，导致鱼类和其他水生生物死亡。必须对污水和农业径流进行适当处理。
Green chemistry principles encourage sustainable practices: using renewable feedstocks, reducing energy consumption, designing biodegradable products, and minimising hazardous waste. Recycling metals and developing alternative fuels (biofuels, hydrogen) are practical steps towards a more sustainable chemical industry.
绿色化学原则倡导可持续发展的实践：使用可再生原料、降低能耗、设计可生物降解的产品、尽量减少有害废物。金属回收和开发替代燃料（生物燃料、氢气）是走向更可持续化学工业的现实步骤。
Published by TutorHao | Chemistry Revision Series | aleveler.com
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