📚 Mind Map Quick Revision for GCSE CIE Chemistry | GCSE CIE 化学思维导图速记
This quick revision mind map organises core GCSE CIE Chemistry topics into concise, interconnected branches for efficient memorisation. Each section mirrors a hub node of a typical mind map, helping you link concepts such as atomic structure, bonding, stoichiometry, and organic chemistry. Work through the paired English–Chinese explanations to reinforce bilingual recall and exam confidence.
这份快速复习思维导图将 GCSE CIE 化学的核心主题整理成简洁、相互关联的分支，便于高效记忆。每个部分对应思维导图中的一个枢纽节点，帮助你串联原子结构、化学键、化学计量和有机化学等概念。通过中英配对的讲解，可以强化双语回忆和考试信心。
1. Atomic Structure | 原子结构
The atom consists of a tiny, dense nucleus containing protons and neutrons, surrounded by electrons in shells. Protons carry a positive charge (+1) and have a relative mass of 1, neutrons have no charge (0) and a mass of 1, while electrons carry a negative charge (−1) and a negligible mass of 1/1840.
原子由一个微小致密的原子核和核外分层排布的电子组成，原子核内含有质子和中子。质子带一个单位正电荷，相对质量为 1；中子不带电，相对质量也为 1；电子带一个单位负电荷，质量仅为质子的 1/1840。
The atomic number (Z) equals the number of protons and defines the element. The mass number (A) is the total number of protons plus neutrons. Isotopes are atoms of the same element with the same number of protons but different numbers of neutrons, hence the same chemical properties but different physical properties such as density and rate of diffusion.
原子序数 (Z) 等于质子数，决定了元素种类。质量数 (A) 是质子数和中子数之和。同位素是质子数相同而中子数不同的同种原子，因此化学性质相同，但物理性质（如密度、扩散速率）不同。
Electron configurations follow the 2.8.8 rule for the first 20 elements. Electrons fill the lowest available energy levels first. The group number equals the number of outer-shell electrons (for Groups 1 to 7 and 0), which dictates an element’s valency and chemical reactivity.
前 20 号元素的电子排布遵循 2.8.8 规则。电子优先填充最低能级。主族序数等于最外层电子数（适用于第 1 至第 7 及第 0 族），这决定了元素的化合价和化学活泼性。
2. Chemical Bonding and Structure | 化学键与物质结构
Ionic bonding occurs between metals and non-metals. Metals lose electrons to form positive cations, non-metals gain electrons to form negative 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 and conduct electricity when molten or dissolved in water because ions are free to move.
离子键存在于金属与非金属之间。金属原子失去电子成为阳离子，非金属原子得到电子成为阴离子，带相反电荷的离子通过强大的静电引力构成巨型离子晶格。离子化合物熔沸点高，在熔融或溶于水时能导电，因为此时离子可以自由移动。
Covalent bonding forms between non-metal atoms by sharing pairs of electrons. Simple molecular substances contain a fixed number of atoms held by strong covalent bonds within molecules, but weak intermolecular forces between molecules result in low melting and boiling points. Giant covalent structures, such as diamond (each carbon atom bonded to four others) and graphite (layered structure with delocalised electrons), have very high melting points; graphite conducts electricity due to free electrons.
共价键通过非金属原子间共用电子对形成。简单分子物质中，分子内原子靠强共价键结合，但分子间存在弱的分子间作用力，因此熔沸点较低。巨型共价结构如金刚石（每个碳原子与四个碳原子成键）和石墨（层状结构，有离域电子），熔沸点极高；石墨因含有自由电子而能导电。
Metallic bonding involves a lattice of positive metal ions surrounded by a ‘sea’ of delocalised electrons. This electron sea allows metals to conduct heat and electricity and makes them malleable and ductile, as layers of ions can slide over each other without breaking the metallic bond.
金属键可视为金属阳离子规则排列，沉浸在离域电子的“海洋”中。这种电子海使金属能导热、导电，并具有良好的延展性，因为在外力作用下离子层可以相对滑动而金属键不被破坏。
3. Stoichiometry and the Mole | 化学计量与摩尔
The mole is the amount of substance containing 6.02 × 10²³ particles (Avogadro constant). The molar mass (Mᵣ for molecules, Aᵣ for atoms) in g mol⁻¹ is numerically equal to the relative formula mass. Number of moles = mass (g) ÷ molar mass (g mol⁻¹).
摩尔是包含 6.02 × 10²³ 个微粒（阿伏伽德罗常数）的物质的量。摩尔质量（分子用 Mᵣ，原子用 Aᵣ）以 g mol⁻¹ 为单位时，数值上等于相对式量。物质的量 (mol) = 质量 (g) ÷ 摩尔质量 (g mol⁻¹)。
Balanced chemical equations show the mole ratio of reactants and products. Using the mole ratio, you can calculate reacting masses and the mass of products. The concentration of a solution (mol dm⁻³) = number of moles ÷ volume (dm³). For gases at room temperature and pressure (r.t.p.), one mole occupies 24 dm³.
配平的化学方程式表示反应物与生成物之间的物质的量之比。利用这个数量关系可以计算反应质量和产物质量。溶液的浓度 (mol dm⁻³) = 物质的量 ÷ 体积 (dm³)。在室温和常压下，1 mol 任何气体体积约为 24 dm³。
Percentage yield = (actual yield ÷ theoretical yield) × 100%. Percentage purity = (mass of pure substance ÷ mass of impure sample) × 100%. These calculations help assess reaction efficiency and sample quality.
产率 = (实际产量 ÷ 理论产量) × 100%；纯度 = (纯物质质量 ÷ 不纯样品质量) × 100%。这些计算用于评估反应效率与样品品质。
4. Electrochemistry and Electrolysis | 电化学与电解
Electrolysis is the decomposition of an ionic compound by passing direct current through its molten or aqueous state. The electrolyte is the substance that conducts electricity and is decomposed. The cathode (negative electrode) attracts cations, which gain electrons (reduction). The anode (positive electrode) attracts anions, which lose electrons (oxidation).
电解是利用直流电使熔融态或水溶液中的离子化合物分解的过程。电解质是能导电并被分解的物质。阴极（负极）吸引阳离子，阳离子在该处得到电子发生还原反应；阳极（正极）吸引阴离子，阴离子失去电子发生氧化反应。
In the electrolysis of molten lead(II) bromide, Pb²⁺ ions move to the cathode and form lead metal, while Br⁻ ions move to the anode and form bromine gas. In aqueous solutions, the products depend on the relative reactivity of the ions and the concentration. For dilute NaCl(aq), hydrogen is produced at the cathode and oxygen at the anode, while concentrated NaCl(aq) yields chlorine at the anode.
电解熔融溴化铅时，Pb²⁺ 离子移向阴极生成金属铅，Br⁻ 离子移向阳极生成溴气。在水溶液中，产物取决于离子的相对放电能力及溶液浓度。电解稀 NaCl 溶液时，阴极产生氢气，阳极产生氧气；电解浓 NaCl 溶液时，阳极产生氯气。
Electroplating uses electrolysis to coat a metal object with a thin layer of another metal, often for protection or decoration. The object to be plated is made the cathode, the plating metal is the anode, and the electrolyte contains ions of the plating metal.
电镀是利用电解在金属物体表面沉积一层薄金属，常用于防腐蚀或装饰。待镀物件做阴极，镀层金属做阳极，电解液含镀层金属的离子。
5. Energy Changes and Rates of Reaction | 能量变化与反应速率
Exothermic reactions release heat energy to the surroundings, causing a temperature rise (e.g., combustion, neutralisation). Endothermic reactions absorb heat energy, causing a temperature drop (e.g., thermal decomposition, photosynthesis). The overall energy change ΔH is negative for exothermic and positive for endothermic reactions.
放热反应向环境释放热量，使温度升高（如燃烧、中和反应）；吸热反应从环境吸收热量，使温度降低（如热分解、光合作用）。放热反应的焓变 ΔH 为负值，吸热反应为正值。
The rate of reaction can be measured by the rate of formation of a product or the rate of consumption of a reactant. Factors increasing reaction rate: higher concentration, higher pressure (for gases), greater surface area of solids, higher temperature, and the use of a catalyst. Catalysts lower the activation energy by providing an alternative reaction pathway, without being used up.
反应速率可通过生成物增加或反应物减少的快慢来衡量。加快反应速率的因素包括：提高浓度、增大气体压强、增加固体表面积、升高温度以及使用催化剂。催化剂通过提供另一条反应路径降低活化能，自身在反应前后质量和化学性质不变。
Collision theory states that particles must collide with sufficient energy (equal to or greater than the activation energy) and in the correct orientation for a reaction to occur. Increasing the frequency of successful collisions increases the rate.
碰撞理论指出，反应物粒子必须发生碰撞，且碰撞能量不低于活化能，取向合适，反应才能发生。提高有效碰撞的频率便能加快反应速率。
6. Chemical Equilibrium | 化学平衡
Reversible reactions can proceed in both forward and backward directions. Dynamic equilibrium is reached in a closed system when the rate of the forward reaction equals the rate of the backward reaction, and the macroscopic properties (concentration, colour, pressure) remain constant. The position of equilibrium indicates whether the reactants or products are favoured.
可逆反应能同时向正反应方向和逆反应方向进行。在密闭系统中，当正反应速率与逆反应速率相等时，体系达到动态平衡，宏观性质（浓度、颜色、压强）保持恒定。平衡位置反映了反应物或产物的占比优势。
Le Chatelier’s principle states that if a system at equilibrium is subjected to a change in concentration, temperature or pressure, the position of equilibrium shifts to oppose that change. Increasing temperature favours the endothermic direction; increasing pressure favours the side with fewer gas molecules. Catalysts do not affect the position of equilibrium; they only speed up both forward and backward rates equally.
勒夏特列原理指出，如果改变影响平衡的条件之一（浓度、温度或压强），平衡将向减弱这种改变的方向移动。升高温度，平衡向吸热方向移动；增大压强，平衡向气体分子数减少的方向移动。催化剂不影响平衡位置，只同等程度地加快正、逆反应速率。
The Haber process for ammonia synthesis (N₂ + 3H₂ ⇌ 2NH₃) uses an iron catalyst at around 450 °C and 200 atm. These conditions are a compromise between rate, yield and cost. The ammonia is continuously removed to drive the equilibrium towards products.
哈伯合成氨法（N₂ + 3H₂ ⇌ 2NH₃）使用铁催化剂，在约 450 °C、200 atm 下进行。这些条件是速率、产率和成本之间的折中方案。不断分离出氨气可促使平衡向生成物方向移动。
7. Acids, Bases and Salts | 酸、碱和盐
An acid is a proton (H⁺) donor; a base is a proton acceptor. Alkalis are soluble bases that release OH⁻ ions in water. The pH scale (0–14) measures the concentration of H⁺ ions: pH less than 7 is acidic, pH 7 is neutral, pH greater than 7 is alkaline. Universal indicator or pH probes can be used to determine pH.
酸是质子（H⁺）给予体，碱是质子接受体。可溶性碱在水溶液中产生 OH⁻ 离子，又称碱溶液。pH 标度（0～14）表示溶液中 H⁺ 浓度：pH < 7 为酸性，pH = 7 为中性，pH > 7 为碱性。可用通用指示剂或 pH 计测定 pH 值。
Neutralisation is the reaction between an acid and a base to form salt and water: H⁺(aq) + OH⁻(aq) → H₂O(l). Acids react with metals, metal oxides, metal hydroxides and carbonates to produce salts. The name of a salt comes from the acid and the metal/base: hydrochloric acid produces chlorides, sulfuric acid produces sulfates, nitric acid produces nitrates.
中和反应是酸与碱生成盐和水的反应：H⁺(aq) + OH⁻(aq) → H₂O(l)。酸可与金属、金属氧化物、金属氢氧化物以及碳酸盐反应制得盐。盐的名称由所用的酸和金属/碱决定：盐酸生成盐酸盐（氯化物），硫酸生成硫酸盐，硝酸生成硝酸盐。
Preparing soluble salts typically uses the titration method for Group 1 or ammonium salts, and the excess solid method (acid + insoluble base/metal/carbonate) followed by filtration and crystallisation for other salts. Precipitation can prepare insoluble salts by mixing two solutions containing the required ions.
制备可溶性盐时，第 I 族盐或铵盐常用滴定法；其他可溶性盐可用过量固体法（酸+难溶性碱/金属/碳酸盐），然后过滤、结晶。制备难溶性盐可通过混合两种含有所需离子的溶液，生成沉淀。
8. The Periodic Table and Group Trends | 元素周期表与族趋势
The modern Periodic Table arranges elements in order of increasing atomic number. The vertical columns are called groups; elements in the same group have the same number of outer-shell electrons and similar chemical properties. Horizontal rows are periods; the period number indicates the number of electron shells.
现代周期表按原子序数递增的顺序排列元素。纵列称为族，同族元素最外层电子数相同，化学性质相似。横排称为周期，周期数等于该元素原子的电子层数。
Group 1: Alkali metals (Li, Na, K) are soft, have low densities, and react vigorously with water to form metal hydroxides and hydrogen. Reactivity increases down the group because the outer electron is further from the nucleus and more easily lost. Group 7: Halogens (F, Cl, Br, I) are diatomic non-metals; reactivity decreases down the group as the atom gets larger and it becomes harder to gain an electron. Group 0: Noble gases are monatomic and unreactive due to full outer shells.
第 1 族碱金属（Li, Na, K）质软、密度低，与水剧烈反应生成金属氢氧化物和氢气。因原子半径增大、最外层电子更易失去，反应性沿族自上而下增强。第 7 族卤素（F, Cl, Br, I）为双原子非金属；原子半径增大使得得电子能力下降，因此反应性沿族自上而下减弱。第 0 族稀有气体以单原子分子存在，因最外层电子已满而极不活泼。
Transition metals (central block) form coloured compounds, have variable oxidation states, and act as catalysts (e.g., iron in Haber process, nickel in hydrogenation). They are hard, dense, and have high melting points compared to Group 1 metals.
过渡金属（周期表中央区）常形成有色化合物，具有多种氧化态，并可作催化剂（如哈柏制氨中的铁、加氢反应中的镍）。与第 1 族金属相比，过渡金属较硬、密度大、熔点高。
9. Organic Chemistry | 有机化学
Organic chemistry studies compounds containing carbon. The homologous series is a family of compounds with the same general formula, similar chemical properties, and a gradation in physical properties. Alkanes (CₙH₂ₙ₊₂) are saturated hydrocarbons with single C–C bonds; they undergo combustion and substitution reactions with halogens in the presence of UV light.
有机化学研究含碳化合物。同系物是一系列具有相同通式、相似化学性质且物理性质随碳链增长呈规律性变化的有机物。烷烃 (CₙH₂ₙ₊₂) 是饱和烃，只有碳碳单键，可发生燃烧和紫外光下的取代反应。
Alkenes (CₙH₂ₙ) contain at least one C=C double bond and are unsaturated. They undergo addition reactions: with hydrogen (hydrogenation) to form alkanes, with halogens (bromine water turns colourless as a test for unsaturation), and with steam to form alcohols. Polymers like poly(ethene) are produced by addition polymerisation of alkene monomers.
烯烃 (CₙH₂ₙ) 含有至少一个碳碳双键，属于不饱和烃。烯烃可发生加成反应：与氢气加成（氢化）生成烷烃；与卤素加成（可使溴水褪色，用于检验不饱和键）；与水蒸气加成生成醇。加聚反应（如乙烯单体聚合）可制得聚乙烯等聚合物。
Alcohols (CₙH₂ₙ₊₁OH) contain the –OH functional group. Ethanol can be made by fermentation of glucose (yeast, warm conditions, anaerobic) or by hydration of ethene with steam and a phosphoric acid catalyst. Carboxylic acids (CₙH₂ₙ₊₁COOH) have the –COOH group and are weak acids. Esters, formed from alcohols and carboxylic acids, have fruity smells and are used in flavourings and perfumes.
醇 (CₙH₂ₙ₊₁OH) 含有羟基官能团。乙醇可通过葡萄糖发酵（酵母、温热、无氧条件）或乙烯与蒸汽在磷酸催化下加成水化制得。羧酸 (CₙH₂ₙ₊₁COOH) 带有羧基，属于弱酸。醇与羧酸反应生成的酯具有水果香味，常用于调味剂和香水。
10. Chemical Analysis and Practical Skills | 化学分析与实验技能
Paper chromatography separates mixtures of soluble substances based on their differing solubilities and adsorption to the paper. An Rf value (distance moved by substance ÷ distance moved by solvent front) can be calculated for identification. Pure substances give a single spot, while mixtures separate into multiple spots.
纸色谱法根据各组分在固定相与流动相中的分配差异来分离可溶性混合物。计算 Rf 值（组分移动距离 ÷ 溶剂前沿移动距离）可辅助鉴定。纯物质在色谱上只有单一斑点，混合物则会出现多个斑点。
Simple distillation separates a solvent from a solution, whilst fractional distillation separates a mixture of miscible liquids with different boiling points. Filtration separates an insoluble solid from a liquid. Crystallisation obtains a pure solid from a solution by evaporating the solvent and cooling.
简单蒸馏用于从溶液中分离溶剂；分馏则用来分离沸点不同的互溶液体混合物。过滤可将不溶性固体与液体分开。结晶法通过蒸发溶剂和冷却使溶质从溶液中以纯固体形式析出。
Cation identification uses sodium hydroxide to produce coloured precipitates (e.g., Cu²⁺ gives blue, Fe²⁺ gives green, Fe³⁺ gives brown). Anion tests include: carbonate (add acid, limewater turns milky), sulfate (add HCl and BaCl₂, white precipitate), halide (add HNO₃ and AgNO₃, Cl⁻ white, Br⁻ cream, I⁻ yellow). Flame tests produce characteristic colours: Li⁺ red, Na⁺ yellow, K⁺ lilac, Ca²⁺ orange-red, Cu²⁺ blue-green.
阳离子鉴定：加入氢氧化钠溶液，根据产生沉淀的颜色推断，如 Cu²⁺ 蓝色、Fe²⁺ 绿色、Fe³⁺ 棕色。阴离子检验：碳酸根（加酸生成使石灰水变浑浊的气体）、硫酸根（加盐酸和氯化钡产生白色沉淀）、卤离子（加稀硝酸和硝酸银，Cl⁻ 白色，Br⁻ 淡黄色，I⁻ 黄色）。火焰试验可呈现特征焰色：Li⁺ 红，Na⁺ 黄，K⁺ 紫，Ca²⁺ 砖红，Cu²⁺ 蓝绿。
Titration is used to find the exact concentration of an acid or alkali. A pipette measures a fixed volume of the solution of unknown concentration, and a burette adds the standard solution. The end-point is indicated by a colour change of an indicator. Repeat runs are done until concordant results are obtained.
滴定用于精确测定酸或碱的浓度。用移液管量取一定体积未知浓度溶液置于锥形瓶中，再用滴定管逐滴加入标准溶液，指示剂变色即为终点。重复滴定直至取得一致性结果，以减少随机误差。
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