📚 GCSE OCR Chemistry: Final Revision Outline | GCSE OCR 化学：期末复习提纲
As your GCSE OCR Chemistry exams approach, a well-structured revision checklist helps you cover every key topic from C1 to C6. This bilingual outline provides a concise overview of essential concepts, equations, and practical skills to boost your confidence.
当你的 GCSE OCR 化学考试临近时，一份条理清晰的复习提纲能帮助你覆盖 C1 到 C6 每个关键主题。这份双语提纲提供基本概念、方程式和实践技能的简明概述，增强你的信心。
1. Particle Model and Atomic Structure | 粒子模型与原子结构
Atoms consist of a nucleus containing protons and neutrons, surrounded by electrons in shells.
原子由包含质子和中子的原子核组成，核外电子分层排布。
The atomic number equals the number of protons; the mass number equals the total of protons plus neutrons.
原子序数等于质子数；质量数等于质子数与中子数之和。
Isotopes are atoms of the same element with different numbers of neutrons, hence different mass numbers.
同位素是同种元素的中子数不同的原子，因此质量数不同。
Electrons occupy shells in the order 2,8,8; the electronic configuration determines chemical properties.
电子以 2,8,8 的顺序占据电子层；电子排布决定化学性质。
2. The Periodic Table | 周期表
Elements are arranged by increasing atomic number; rows are periods and columns are groups.
元素按原子序数递增排列；横行为周期，纵列为主族。
Group 1 alkali metals are highly reactive and reactivity increases down the group.
第一主族碱金属非常活泼，且活泼性从上到下增强。
Group 7 halogens become less reactive down the group; chlorine is more reactive than iodine.
第七主族卤素从上到下活泼性减弱；氯比碘更活泼。
Transition metals are harder, denser and often form coloured compounds, unlike Group 1 metals.
过渡金属比第一主族金属更硬、密度更大，常形成有色化合物。
3. Ionic, Covalent and Metallic Bonding | 离子键、共价键和金属键
Ionic bonding involves electron transfer from metal to non-metal, forming oppositely charged ions held by strong electrostatic forces.
离子键涉及电子从金属转移到非金属，形成带相反电荷的离子，靠强静电引力结合。
Covalent bonding occurs when non-metal atoms share pairs of electrons to achieve full outer shells.
共价键发生在非金属原子间，通过共用电子对达到稳定最外层。
Metallic bonding consists of a lattice of positive ions surrounded by a sea of delocalised electrons, allowing conductivity and malleability.
金属键由阳离子晶格和离域电子海组成，使金属具有导电性和延展性。
4. Structures and Properties | 结构与性质
对比不同物质的结构、键和典型性质：
| Structure | 中文 |
|---|---|
| Giant ionic lattice – high m.p, conduct when molten/aqueous | 巨型离子晶格 – 熔点高，熔融或水溶液导电 |
| Simple molecular – low m.p/b.p, do not conduct electricity | 简单分子 – 熔沸点低，不导电 |
| Giant covalent – very high m.p, e.g. diamond (hard) and graphite (slippery, conducts) | 巨型共价 – 极高熔点，如金刚石（硬）和石墨（滑腻、导电） |
| Metallic – high m.p, malleable, good conductors due to delocalised electrons | 金属 – 高熔点，延展性好，离域电子使其导电导热好 |
Properties like melting point and conductivity can be explained by the strength of bonding and presence of free-moving charged particles.
熔点和导电性等性质可由键的强度和自由移动带电粒子的存在来解释。
5. Quantitative Chemistry: Moles and Equations | 定量化学：摩尔与方程式
The mole (mol) is the amount of substance containing 6.02×10²³ particles; molar mass (Mᵣ) is the mass of one mole in grams.
摩尔是包含 6.02×10²³ 个粒子的物质的量；摩尔质量是 1 摩尔物质的质量（克）。
moles = mass (g) ÷ Mᵣ
物质的量（摩尔）= 质量（克）÷ 相对分子质量
Balancing equations ensures mass is conserved; coefficients give mole ratios for reactants and products.
配平方程式确保质量守恒；系数给出反应物和生成物的摩尔比。
Concentration (mol/dm³) = moles ÷ volume (dm³); remember 1 dm³ = 1000 cm³.
浓度 (mol/dm³) = 物质的量 ÷ 体积 (dm³)；注意 1 dm³ = 1000 cm³。
6. Chemical Changes: Acids, Bases and Electrolysis | 化学变化：酸、碱与电解
Acids produce H⁺ in solution; alkalis produce OH⁻. Neutralization: H⁺ + OH⁻ → H₂O.
酸在水溶液中产生 H⁺；碱产生 OH⁻。中和反应：H⁺ + OH⁻ → H₂O。
Strong acids fully ionise (e.g. HCl, H₂SO₄); weak acids like ethanoic acid partially ionise.
强酸完全电离（如 HCl、H₂SO₄）；弱酸如乙酸部分电离。
Electrolysis splits ionic compounds using direct current; cations move to the cathode and anions to the anode.
电解通过直流电分解离子化合物；阳离子移向阴极，阴离子移向阳极。
During electrolysis of aqueous solutions, the least reactive element is usually produced at the cathode.
电解水溶液时，在阴极通常生成较不活泼的元素。
7. Energy Changes in Reactions | 反应中的能量变化
Exothermic reactions transfer energy to the surroundings (e.g. combustion, neutralisation); endothermic reactions take in energy (e.g. thermal decomposition).
放热反应向环境释放能量（如燃烧、中和）；吸热反应从环境吸收能量（如热分解）。
Activation energy is the minimum energy needed to start a reaction.
活化能是反应开始所需的最小能量。
Bond breaking is endothermic; bond making is exothermic. ΔH = energy in – energy out.
断键吸热；成键放热。ΔH = 吸收能量 – 释放能量。
Reaction profiles show the energy changes during a reaction.
反应历程图显示反应过程中的能量变化。
8. Rates of Reaction and Equilibrium | 反应速率与平衡
Rate depends on concentration, temperature, surface area, and the presence of a catalyst.
反应速率取决于浓度、温度、表面积以及催化剂的使用。
Collision theory: particles must collide with sufficient energy (≥ activation energy) and correct orientation.
碰撞理论：粒子必须以足够的能量（≥活化能）和合适的取向碰撞。
Catalysts lower the activation energy by providing an alternative pathway; they are not used up.
催化剂通过提供替代路径降低活化能；它们本身不消耗。
Reversible reactions reach dynamic equilibrium when forward and backward rates are equal. Le Chatelier’s principle predicts shifts.
可逆反应正向和逆向速率相等时达到动态平衡；勒夏特列原理可预测平衡移动。
For A + B ⇌ C + D (+heat), increasing temperature shifts equilibrium to endothermic direction.
对于 A + B ⇌ C + D (+热)，升高温度使平衡向吸热方向移动。
9. Organic Chemistry: Crude Oil to Polymers | 有机化学：从原油到聚合物
Crude oil is a mixture of hydrocarbons, separated by fractional distillation based on boiling points.
原油是烃的混合物，通过分馏根据沸点不同进行分离。
Alkanes (CₙH₂ₙ₊₂) are saturated hydrocarbons; alkenes (CₙH₂ₙ) contain a C=C double bond and are unsaturated.
烷烃 (CₙH₂ₙ₊₂) 是饱和烃；烯烃 (CₙH₂ₙ) 含有一个 C=C 双键，不饱和。
Alkenes undergo addition reactions (e.g. with bromine water, decolourises) and form polymers via addition polymerisation.
烯烃发生加成反应（例如使溴水褪色），并通过加聚反应生成聚合物。
Alcohols contain –OH; ethanol can be made by fermentation (glucose → ethanol + CO₂) or hydration of ethene.
醇含有 –OH；乙醇可通过发酵（葡萄糖 → 乙醇 + CO₂）或乙烯水合制得。
10. Chemical Analysis | 化学分析
Pure substances have fixed melting and boiling points; impure substances melt over a range.
纯物质有固定的熔点和沸点；不纯物质熔融范围宽。
Chromatography separates mixtures; Rf value = distance moved by substance ÷ distance moved by solvent.
色谱法分离混合物；Rf 值 = 物质移动距离 ÷ 溶剂移动距离。
Gas tests: hydrogen ‘squeaky pop’ with lit splint; oxygen relights glowing splint; carbon dioxide turns limewater cloudy.
气体检验：氢气遇点燃木条发出“噗”声；氧气使带火星木条复燃；二氧化碳使石灰水变浑浊。
Tests for cations and anions include flame tests (e.g. Li⁺ red, Na⁺ yellow, K⁺ lilac) and precipitation reactions.
阳离子和阴离子检验包括焰色反应（如 Li⁺ 红，Na⁺ 黄，K⁺ 紫）和沉淀反应。
11. The Earth’s Atmosphere | 地球大气
The early atmosphere contained mostly CO₂ and water vapour; modern air is about 78% N₂, 21% O₂, with traces of noble gases and CO₂.
早期大气主要含 CO₂ 和水蒸气；现代空气约 78% N₂、21% O₂，以及少量稀有气体和 CO₂。
Photosynthesis by algae and plants reduced CO₂ levels and increased O₂ over billions of years.
藻类和植物的光合作用在数十亿年间降低了 CO₂ 含量，增加了 O₂。
Greenhouse gases (CO₂, CH₄) trap infrared radiation, contributing to global warming. Human activities increase their levels.
温室气体（CO₂、CH₄）吸收红外辐射，导致全球变暖。人类活动增加了其含量。
Air pollution from burning fuels: carbon monoxide (toxic), sulfur dioxide (acid rain), nitrogen oxides (asthma), particulates (global dimming).
燃烧燃料产生的空气污染物：一氧化碳（有毒）、二氧化硫（酸雨）、氮氧化物（哮喘）、颗粒物（全球变暗）。
12. Using Resources and Sustainable Chemistry | 资源利用与可持续化学
Finite
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