📚 OCR GCSE Chemistry: Key Terminology Fast-Track Memorisation Guide | OCR GCSE 化学：关键术语速记指南
Mastering chemistry vocabulary is half the battle in Year 11. This guide groups must-know terms by topic, uses word roots, visual hooks and pattern spotting to help you recall definitions quickly and accurately. Each section pairs English explanations with Chinese translations to build deep understanding.
掌握化学术语是 Year 11 成功的一半。本指南按主题归类必记词汇，利用词根、视觉联想和规律识别，帮助你快速准确回忆定义。每个小节都提供中英配对解释，以巩固深层理解。
1. Atomic Structure & Periodic Table | 原子结构与周期表
Atom – the smallest unit of an element, made of a nucleus (protons + neutrons) and orbiting electrons. Think "a-tom" as "a tiny piece".
原子 – 元素的最小单位，由原子核（质子+中子）和绕核电子构成。联想 "atom" 如 "a tiny piece"（极小的一块）。
Isotope – atoms of the same element with different numbers of neutrons. Mnemonic: "iso" = same, "tope" = place (same place on periodic table).
同位素 – 质子数相同而中子数不同的同种原子。速记："iso"（相同） + "tope"（位置）→ 在周期表中同一位置。
Relative atomic mass (Aᵣ) – weighted average mass of an atom compared to 1/12 of carbon‑12. Imagine the mass "relative" to a carbon‑12 partner.
相对原子质量 (Aᵣ) – 与碳‑12 原子质量的 1/12 相比的平均值。想象这是与碳‑12 这位"搭档"的"相对"质量。
The modern periodic table is arranged by increasing atomic number, not mass. Groups show number of outer electrons; periods show number of shells. Use the sentence "Green Plants Need Soaking" to recall Group 1 reactivity increases down: Lithium, Sodium, Potassium.
现代周期表按原子序数递增排列，而不是质量。族号暗示最外层电子数；周期号暗示电子层数。用"锂钠钾 下移更活泼"记住第一族反应性向下增强。
2. Bonding, Structure & Properties | 化学键、结构与性质
Ionic bonding – transfer of electrons from metal to non‑metal, forming a giant ionic lattice. Remember "metal gives, non‑metal takes" → "opposites attract".
离子键 – 金属向非金属转移电子，形成巨型离子晶格。记忆口诀："金属给，非金属拿"→ "异性相吸"。
Covalent bonding – sharing of electrons between non‑metals. Visualise holding hands to share; single bond is one shared pair, double bond is two pairs.
共价键 – 非金属间共享电子对。想象两个人拉手共享；单键是一对共享电子，双键是两对。
Metallic bonding – a sea of delocalised electrons surrounding positive metal ions. Think of a "soup of electrons" holding metal atoms together.
金属键 – 离域电子海洋围绕正金属离子的结构。想象"电子浓汤"把金属原子粘合在一起。
Giant covalent structures (diamond, graphite, silicon dioxide) have high melting points. Graphite conducts electricity because each carbon uses only three of four outer electrons, leaving one free.
巨型共价结构（金刚石、石墨、二氧化硅）熔点很高。石墨能导电，是因为每个碳只用了四个外层电子中的三个，留下一个自由电子。
3. Quantitative Chemistry | 定量化学
Mole (mol) – nt of substance containing 6.02 × 10²³ particles (Avogadro constant). Think of a mole as a "chemical dozen", but much larger.
摩尔 (mol) – 含有 6.02 × 10²³ 个微粒（阿伏伽德罗常数）的物质的量。把摩尔想象成一个"化学打"，只不过巨大无比。
n triangle: mass = moles × Mᵣ. For gases at RTP, volume (dm³) = moles × 24. Use the mantra "mass over Mr gives moles" (n = m/Mᵣ).
公式三角：质量 = 摩尔数 × 相对分子质量。常温常压下气体体积 (dm³) = 摩尔数 × 24。记住口诀"质量除以 Mᵣ 得摩尔"。
Concentration (mol/dm³) = moles/volume. Think of the "C = n / V" formula as "concentrated = number of moles in 1 dm³".
浓度 (mol/dm³) = 摩尔数/体积。把公式 C = n/V 理解为"每 dm³ 里溶解了多少摩尔"。
Empirical formula – simplest whole‑number ratio of atoms. Molecular formula – actual number. E.g., glucose molecular formula C₆H₁₂O₆, empirical CH₂O.
经验式（最简式） – 最简单整数原子比。分子式 – 真实原子数。例如葡萄糖分子式 C₆H₁₂O₆，经验式 CH₂O。
4. Chemical Changes | 化学变化
Oxidation – gain of oxygen or loss of electrons. Reduction – loss of oxygen or gain of electrons. Remember OIL RIG: Oxidation Is Loss (of electrons), Reduction Is Gain.
氧化 – 加氧或失电子。还原 – 脱氧或得电子。记口诀 OIL RIG：氧化失电子，还原得电子。
Acid + Base → Salt + Water. Neutralisation is a reaction between H⁺ and OH⁻ to form water. A strong acid fully dissociates in water; weak acid only partially.
酸 + 碱 → 盐 + 水。中和反应是 H⁺ 与 OH⁻ 结合生成水。强酸在水中完全电离；弱酸仅部分电离。
Reactivity series – please send lions, cats, monkeys and zebras in cages (Potassium, Sodium, Lithium, Calcium, Magnesium, Aluminium, Zinc, Iron, Copper). More reactive metal displaces less reactive from its compound.
金属活动性顺序 – 钾钙钠镁铝 锌铁锡铅氢 铜汞银铂金。更活泼的金属能把不如它活泼的金属从其化合物中置换出来。
5. Energy Changes | 能量变化
Exothermic – heat exits; temperature of surroundings rises. "Exo" sounds like "exit". Endothermic – heat enters; temperature falls.
放热反应 – 热量"出"；环境温度升高。英文 exo 联想 exit（出口）。吸热反应 – 热量"进"；环境温度下降。
Activation energy (Eₐ) – minimum energy needed to start a reaction. Think of it as the "push" required to roll a boulder uphill before it races down.
活化能 (Eₐ) – 启动反应所需的最低能量。把它想象成把巨石推上山坡所需的那一"推"，之后它便自动滚下。
In bond energy calculations, energy to break bonds is endothermic (+), energy released making bonds is exothermic (–). Overall ΔH = Σ(breaking) − Σ(making).
在键能计算中，断裂化学键吸热（+），形成化学键放热（−）。总ΔH = Σ断键能 − Σ成键能。
6. Rate of Reaction | 反应速率
Rate depends on collision frequency and energy. To speed up: increase temperature, concentration/pressure, surface area, or add a catalyst.
反应速率取决于碰撞频率和能量。加速方法：升高温度、增大浓度/压强、增大表面积或加入催化剂。
A catalyst provides an alternative pathway with lower activation energy and is not used up. Think "catalyst = shortcut".
催化剂提供低活化能的替代路径，本身不消耗。联想"催化剂 = 抄近道"。
ty of product formed or reactant used ÷ time. For gases, measure volume per second; for mass, loss of mass per second.
计算平均速率：速率 = 生成物产量或反应物消耗量 ÷ 时间。气体反应可测每秒体积；质量变化可测每秒质量损失。
7. Organic Chemistry – Hydrocarbons & Alkenes | 有机化学——烃与烯烃
Hydrocarbon – compound containing only carbon and hydrogen. Alkanes (CₙH₂ₙ₊₂) are saturated; all C–C single bonds. Alkenes (CₙH₂ₙ) are unsaturated; contain C=C double bond.
烃 – 只含碳和氢的化合物。烷烃 (CₙH₂ₙ₊₂) 饱和，全部是 C–C 单键。烯烃 (CₙH₂ₙ) 不饱和，含有 C=C 双键。
The mnemonic for first four alkanes: Monkeys Eat Peanut Butter (Methane, Ethane, Propane, Butane).
前四种烷烃记忆法：甲烷、乙烷、丙烷、丁烷——"甲乙丙丁"按天干顺序。
Fractional distillation separates crude oil by boiling point. Hot at the bottom, cooler at the top. Large molecules condense low down; small molecules rise high.
分馏按沸点高低分离原油。塔底温度最高，塔顶最低。大分子在下方冷凝；小分子飘升至高处。
Cracking breaks long-chain alkanes into shorter alkanes and alkenes. It needs heat and a catalyst. Alkenes can be tested with bromine water: orange → colourless.
裂化将长链烷烃断裂为短链烷烃和烯烃，需加热和催化剂。烯烃可用溴水检验：橙黄色褪为无色。
8. Organic Chemistry – Functional Groups & Polymers | 有机化学——官能团与聚合物
Alcohols have –OH functional group (e.g., ethanol C₂H₅OH). They burn cleanly, dissolve in water, and react with sodium to produce hydrogen.
醇含有 –OH 官能团（如乙醇 C₂H₅OH）。可清洁燃烧、溶于水、与钠反应放出氢气。
Carboxylic acids have –COOH group (e.g., ethanoic acid). They are weak acids, partially dissociate in water, and react with alcohols to form esters (RCOOR') in a reversible reaction.
羧酸含 –COOH 基团（如乙酸）。属弱酸，在水中部分电离，与醇可逆反应生成酯 (RCOOR')。
Addition polymerisation: many alkene monomers join by opening their double bonds to form a long saturated chain. Poly(ethene) forms from ethene.
加聚反应：许多烯烃单体打开双键相连，形成长饱和链。如乙烯聚合成聚乙烯。
Condensation polymerisation: monomers join by losing a small molecule (often water). Polyester forms from a diol and a dicarboxylic acid.
缩聚反应：单体连接时脱去小分子（常为水）。如二元醇与二元酸生成聚酯。
9. Chemical Analysis | 化学分析
Pure substance melts at a single, sharp temperature; impurities lower and widen the melting range. Think "pure = sharp".
纯物质具有单一、尖锐的熔点；杂质会降低并拓宽熔程。联想"纯 = 尖锐"。
Chromatography tance moved by spot ÷ distance moved by solvent. Higher Rf = more soluble in mobile phase.
色谱法依据溶解度差异分离混合物。比移值 Rf = 斑点移动距离 ÷ 溶剂前沿距离。Rf 越大，在流动相中溶解度越大。
Gas tests: hydrogen – squeaky pop with lighted splint; oxygen – relights a glowing splint; carbon dioxide – turns limewater cloudy; chlorine – bleaches damp litmus paper.
气体检验：氢气——点燃有爆鸣声；氧气——使带火星木条复燃；二氧化碳——使石灰水变浑浊；氯气——使湿润石蕊试纸漂白。
Flame tests: lithium (crimson), sodium (yellow), potassium (lilac), calcium (orange‑red), copper (green). Mnemonic: "Little Naughty Kids Like Candy" (Lithium red, Sodium yellow, Potassium lilac, Calcium brick‑red).
焰色反应：锂（深红）、钠（黄）、钾（紫）、钙（砖红）、铜（绿）。口诀："钠黄钾紫钙砖红，铜绿锂红记心中"。
10. Atmosphere & Using Resources | 大气与资源利用
Greenhouse gases (CO₂, CH₄, water vapour) trap infrared radiation. Human activities like burning fossil fuels increase CO₂ levels, enhancing the greenhouse effect and global warming.
温室气体（CO₂、CH₄、水蒸气）吸收红外辐射。燃烧化石燃料等人类活动增加 CO₂ 浓度，强化温室效应和全球变暖。
dioxide + water. Incomplete combustion produces carbon monoxide (toxic) or carbon (soot).
完全燃烧：烃 + 氧气 → 二氧化碳 + 水。不完全燃烧产生一氧化碳（有毒）或碳（烟灰）。
Potable water is safe to drink, achieved by filtration and sterilisation (chlorine, ozone or UV). Desalination (distillation or reverse osmosis) removes salt but requires lots of energy.
饮用水经过滤和消毒（氯、臭氧或紫外）后安全可饮。海水淡化（蒸馏或反渗透）除去盐分，但能耗高。
Life Cycle Assessment (LCA) evaluates environmental impact from raw material extraction, manufacture, use to disposal. Recycling conserves resources and reduces landfill.
生命周期评估 (LCA) 评估从原材料获取、制造、使用到废弃各阶段的环境影响。回收利用可节约资源、减少填埋。
The Haber process makes ammonia (NH₃) from N₂ and H₂ at 450 °C, 200 atm with iron catalyst. It's a reversible reaction: N₂ + 3H₂ ⇌ 2NH₃. Ammonia is used to make nitric acid and fertilisers.
哈伯法在 450 °C、200 atm 和铁催化剂下由 N₂ 和 H₂ 制氨。为可逆反应：N₂ + 3H₂ ⇌ 2NH₃。氨用于制造硝酸和化肥。
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