📚 AS OCR Science: A Fast-Track Guide to Memorising Key Vocabulary | AS OCR 科学：词汇术语速记指南
Mastering scientific terminology is the silent passport to top marks in AS OCR Science. Whether you face definitions of 'electronegativity' in Chemistry, 'eutrophication' in Biology, or 'resultant force' in Physics, precise recall separates grade A students from the rest. This guide builds your mental glossary through word roots, mnemonics, paired explanations, and comparison tables – every term directly aligned with the OCR specification.
掌握科学术语是 AS OCR 科学考试中取得高分的隐形通行证。无论你面对化学中“电负性”、生物中“富营养化”还是物理中“合力”的定义，精准的记忆决定了你能否拿到 A。本指南通过词根、记忆法、成对解释和对比表格帮你建立大脑词汇库——每个术语都紧扣 OCR 考纲。
1. Biology: Key Cell Structure Terms | 生物：关键细胞结构术语
Cell membrane – A selectively permeable phospholipid bilayer that controls the movement of substances into and out of the cell.
细胞膜 – 由磷脂双分子层构成的选择透过性膜，控制物质进出细胞。
Cytoplasm – The jelly-like substance that fills the cell, where many metabolic reactions occur; it contains organelles and enzymes.
细胞质 – 充满细胞的胶状物质，许多代谢反应在此发生；包含细胞器和酶。
Nucleus – A membrane-bound organelle containing the cell's genetic material (DNA) and controlling cellular activities.
细胞核 – 由膜包裹的细胞器，含有细胞的遗传物质（DNA），调控细胞活动。
Mitochondria – Organelles with a double membrane where aerobic respiration takes place, producing ATP. Remember: 'Mighty mitochondria power the cell'.
线粒体 – 具有双层膜的细胞器，是有氧呼吸的场所，产生 ATP。记忆口诀：“线粒体能量工厂”。
Ribosomes – Tiny structures, either free in cytoplasm or bound to rough ER, that are the sites of protein synthesis.
核糖体 – 微小的颗粒状结构，或游离于细胞质，或附着在粗面内质网上，是蛋白质合成的场所。
Chloroplast – An organelle found in plant cells and algae, containing chlorophyll, where photosynthesis occurs.
叶绿体 – 存在于植物细胞和藻类中的细胞器，含有叶绿素，是光合作用的场所。
2. Transport Mechanisms: Diffusion, Osmosis & Active Transport | 运输机制：扩散、渗透与主动运输
Diffusion – The net movement of particles from a region of higher concentration to a region of lower concentration, down a concentration gradient, until equilibrium is reached. It is a passive process requiring no metabolic energy.
扩散 – 粒子从高浓度区域向低浓度区域的净移动，顺浓度梯度进行，直至平衡。这是一个不耗代谢能量的被动过程。
Osmosis – The net movement of water molecules from a region of higher water potential to a region of lower water potential across a partially permeable membrane. We use 'potential' not 'concentration'.
渗透 – 水分子通过部分透膜从较高水势区域向较低水势区域的净移动。注意一定要提“水势”，而非“浓度”。
Active transport – The movement of molecules or ions against their concentration gradient, from a region of lower concentration to a region of higher concentration, using energy from ATP and carrier proteins.
主动运输 – 分子或离子逆浓度梯度的移动，即从低浓度区到高浓度区，需要 ATP 提供能量并借助载体蛋白。
Mnemonics help: 'Diffusion is Downhill, Active is Against' – both require protein carriers if charged. For osmosis, remember 'Water follows the solute' but only through a membrane.
记忆技巧：“扩散是下坡，主动是逆坡”——带电离子如需载体。对渗透，记住“水总是跟着溶质走”，但必须隔着膜。
3. Chemistry: Energetics and Reaction Terms | 化学：能量学与反应术语
Enthalpy change (ΔH) – The heat energy change measured at constant pressure. ΔH = H(products) – . OCR expects you to use standard conditions: 298 K, 100 kPa, and solutions of 1 mol dm⁻³.
焓变 (ΔH) – 在恒压下测量的热量变化。ΔH = H(生成物) – H(反应物)。OCR 要求使用标准条件：298 K，100 kPa，溶液浓度 1 mol dm⁻³。
Exothermic reaction – A reaction that releases energy to the surroundings; ΔH is negative. The temperature of the surroundings increases. Think 'Exit the heat'.
放热反应 – 向环境释放能量的反应，ΔH 为负值。环境温度升高。联想：“热量出去了 (Exit)”。
Endothermic reaction – A reaction that absorbs energy from the surroundings; ΔH is positive. The temperature of the surroundings decreases. Think 'Enter the heat'.
吸热反应 – 从环境吸收能量的反应，ΔH 为正值。环境温度下降。联想：“热量进来了 (Enter)”。
Activation energy (Eₐ) – The minimum energy required for a reaction to occur. It is the energy barrier that must be overcome, often lowered by a catalyst.
活化能 (Eₐ) – 反应发生所需的最小能量。它是必须越过的能垒，催化剂通常能降低它。
Catalyst – A substance that increases the rate of a chemical reaction without being chemically changed itself, by providing an alternative reaction pathway with a lower activation energy.
催化剂 – 能加快反应速率而自身化学性质不变的物质，通过提供一条活化能更低的替代反应路径起作用。
4. Organic Chemistry: Functional Groups & Nomenclature | 有机化学：官能团和命名法
Alkane – A saturated hydrocarbon with the general formula CₙH₂ₙ₊₂, containing only C–C single bonds. e.g. methane CH₄, ethane C₂H₆.
烷烃 – 通式为 CₙH₂ₙ₊₂ 的饱和烃，只含 C–C 单键。例如甲烷 CH₄，乙烷 C₂H₆。
Alkene – ining at least one C=C double bond, general formula CₙH₂ₙ. e.g. ethene C₂H₄. The suffix is '-ene'.
烯烃 – 含至少一个 C=C 双键的不饱和烃，通式 CₙH₂ₙ。例如乙烯 C₂H₄。词尾 "-ene" 表示双键。
Alcohol – A homologous series with the functional group –OH. General formula CₙH₂ₙ₊₁OH. e.g. ethanol C₂H₅OH. Naming: replace '-e' with '-ol'.
醇 – 官能团为 –OH 的同系物。通式 CₙH₂ₙ₊₁OH。例如乙醇 C₂H₅OH。命名时将词尾 "-e" 改为 "-ol"。
Carboxylic acid – Contains the –COOH functional group. Naming uses '-oic acid'. e.g. ethanoic acid CH₃COOH. They are weak acids.
羧酸 – 含 –COOH 官能团。命名用 "-oic acid"。例如乙酸 CH₃COOH。它们是弱酸。
Ester – Formed from an alcohol and a carboxylic acid, with functional group –COO–. Named with alkyl from alcohol + acid stem + '-oate'. This helps OCR naming questions.
酯 – 由醇和羧酸反应生成，官能团为 –COO–。命名：醇的部分为烷基，酸的部分变为 "-oate"。这能帮你轻松应对 OCR 命名题。
5. Physics: Mechanics Fundamentals | 物理：力学基础
Scalar – A quantity that has magnitude only, such as speed, distance, mass, energy. No direction is involved.
标量 – 只有大小的物理量，如速率、路程、质量、能量，不涉及方向。
Vector – A quantity that has both magnitude and direction, e.g. displacement, velocity, acceleration, force. Always draw arrows!
矢量 – 既有大小又有方向的物理量，例如位移、速度、加速度、力。解题时一定画箭头！
Displacement – The distance moved in a stated direction; it is a vector. It is the straight line from start to finish.
位移 – 沿指定方向移动的距离，是矢量，即从起点到终点的直线。
Velocity – ent, a vector. v = Δs / Δt. Constant velocity means both speed and direction are constant.
速度 – 位移的变化率，矢量。v = Δs / Δt。匀速意味着速率和方向都不变。
Acceleration – ctor. a = (v - u) / t. Negative acceleration indicates deceleration or opposite direction.
加速度 – 速度的变化率，矢量。a = (v - u) / t。负加速度表示减速或方向相反。
Newton's First Law – An object remains at rest or in uniform motion unless acted upon by a resultant force. This explains inertia.
牛顿第一定律 – 物体将保持静止或匀速直线运动状态，除非受到合力作用。这解释了惯性。
6. Waves and Electricity Vocabulary | 波与电学词汇
Amplitude – The maximum displacement of a wave from its equilibrium position. For a transverse wave, it is the height of a crest or depth of a trough. Measure from rest position.
振幅 – 波离开平衡位置的最大位移。对于横波，是波峰的高度或波谷的深度。从平衡位置量起。
Wavelength (λ) – The distance between two consecutive points in phase, e.g. crest to crest. Unit: metre (m).
波长 (λ) – 两个相邻同相点之间的距离，例如从波峰到波峰。单位：米 (m)。
Frequency (f) – he number of complete wave cycles passing a point per second. Unit: hertz (Hz). f = 1 / T.
频率 (f) – 每秒通过某点的完整波周期数。单位：赫兹 (Hz)。f = 1 / T。
Current (I) – ectric charge. I = Q / t. Measured in amperes (A). In metals, it is the flow of electrons.
电流 (I) – 电荷的流动速率。I = Q / t。单位：安培 (A)。在金属中，是电子的流动。
Voltage (potential difference, V) – The energy transferred per unit charge between two points. V = W / Q. Kindly remember: 'Volts push the current'.
电压（电势差，V） – 单位电荷在两点间转移的能量。V = W / Q。记住：“电压推动电流”。
Resistance (R) – tion to current flow. R = V / I. It depends on material, length, and cross-sectional area.
电阻 (R) – 对电流的阻碍作用。R = V / I。取决于材料、长度和横截面积。
7. Powerful Prefixes and Suffixes in Science | 科学中有力的前缀和后缀
bio- : life. Biology = study of life. Biodegradable = can be broken down by living organisms.
bio-：生命。Biology = 生物学。Biodegradable = 可被生物降解的。
photo- : light. Photosynthesis = synthesis using light. Photon = a particle of light.
photo-：光。Photosynthesis = 光合作用。Photon = 光子。
-ology : the study of. Geology = study of Earth. Immunology = study of the immune system.
-ology：……学。Geology = 地质学。Immunology = 免疫学。
micro- : very small. Microorganism = microscopic organism. Micrometre = 10⁻⁶ m.
micro-：微小的。Microorganism = 微生物。Micrometre = 10⁻⁶ 米。
macro- arge. Macromolecule = large molecule like protein. Macroscopic = visible to the naked eye.
macro-：大的。Macromolecule = 大分子如蛋白质。Macroscopic = 肉眼可见的。
hydro- : water. Hydrolysis = splitting using water. Hydrophilic = water-loving.
hydro-：水。Hydrolysis = 水解。Hydrophilic = 亲水的。
therm- : heat. Thermometer = device to measure heat. Exothermic = heat exits.
therm-：热。Thermometer = 温度计。Exothermic = 放热。
8. Mnemonics and Acronyms for Complex Processes | 复杂过程的记忆法和首字母缩略词
For redox reactions, remember 'OIL RIG': Oxidation Is Loss (of electrons), Reduction Is Gain (of electrons). This applies across Biology, Chemistry, and Physics.
对于氧化还原反应，记住 'OIL RIG'：氧化是失去电子 (Oxidation Is Loss)，还原是得到电子 (Reduction Is Gain)。这适用于生物、化学、物理。
For the reactivity series, a classic mnemonic: 'Please Stop Calling Me A Crazy Zebra, I Love Cool Silly Goats' – Potassium, Sodium, Calcium, Magnesium, Aluminium, Carbon, Zinc, Iron, Lead, Copper, Silver, Gold. Add Carbon for extraction context.
对于金属活动性顺序，经典记忆法："Please Stop Calling Me A Crazy Zebra, I Love Cool Silly Goats" — 钾 K, 钠 Na, 钙 Ca, 镁 Mg, 铝 Al, 碳 C, 锌 Zn, 铁 Fe, 铅 Pb, 铜 Cu, 银 Ag, 金 Au。加入碳用于冶炼背景。
In photosynthesis, the limiting factors are often on OCR exams: 'LIGHT, CO₂, TEMP' – Light intensity, Carbon dioxide concentration, Temperature. Use the phrase 'Cool Lions Take Charge' as a reminder.
光合作用的限制因素常出现在 OCR 考题中：'光、CO₂、温度'——光强度、二氧化碳浓度、温度。可用 “Cool Lions Take Charge” 唤起记忆。
For the electromagnetic spectrum in order of increasing wavelength or decreasing frequency, plenty remember 'Raging Martians Invaded Venus Using X-ray Guns' – Radio, Microwave, Infrared, Visible, Ultraviolet, X-ray, Gamma. Direction matters!
电磁波谱按波长增加或频率降低顺序，很多人记 "Raging Martians Invaded Venus Using X-ray Guns" —— 无线电波、微波、红外线、可见光、紫外线、X 射线、伽马射线。顺序方向很重要！
9. Confusing Pairs: Comparison Tables | 易混淆词汇对比表
These side-by-side comparisons target the most common OCR pitfalls. Study the table carefully to avoid mixing up definitions in the exam.
这些并排对比针对 OCR 考试中最常见的陷阱。仔细研究表格，避免在考试中混淆定义。
| Term in English | 中文术语 | Key Difference | 关键区别 |
|---|---|---|---|
| Mitosis vs Meiosis | 有丝分裂 vs 减数分裂 | Mitosis produces two genetically identical diploid daughter cells. Meiosis produces four genetically different haploid gametes. | 有丝分裂产生两个遗传相同的二倍体子细胞。减数分裂产生四个遗传不同的单倍体配子。 |
| Exothermic vs Endothermic | 放热 vs 吸热 | Exothermic has negative ΔH, temperature of surroundings rises. Endothermic has positive ΔH, temperature falls. | 放热 ΔH 为负，环境升温。吸热 ΔH 为正，环境降温。 |
| Speed vs Velocity | 速率 vs 速度 | Speed is scalar (magnitude only). Velocity is vector (magnitude and direction). | 速率是标量（只有大小）。速度是矢量（大小和方向）。 |
| Mass vs Weight | 质量 vs 重量 | Mass is amount of matter (kg), scalar, constant. Weight is force due to gravity (N), vector, varies with g. | 质量是物质的量 (kg)，标量，恒定。重量是重力造成的力 (N)，矢量，随 g 变化
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