Year 12 OCR Science: A Rapid Memorisation Guide to Key Terminology | A-Level 科学词汇术语速记指南

📚 Year 12 OCR Science: A Rapid Memorisation Guide to Key Terminology | A-Level 科学词汇术语速记指南

Mastering the language of Science is the first step towards exam success. In OCR Year 12 courses, whether you are studying Biology, Chemistry, or Physics, a solid grasp of precise terminology allows you to decode questions, write concise answers, and link concepts across topics. This guide gathers high-frequency terms, arranges them by discipline, and explains each with a memory shortcut.

掌握科学语言是迈向考试成功的第一步。在 OCR Year 12 课程中，无论你学习的是生物、化学还是物理，精准掌握术语都能帮助你理解题目、写出简洁的答案，并建立跨主题的概念联系。本指南汇集高频术语，按学科排列，并为每个术语搭配了记忆捷径。

1. Why Scientific Terminology Matters | 科学术语为何重要

Examiners in OCR A-Level Science papers award marks for the correct use of technical vocabulary. A statement such as “the enzyme changes shape” may be vague, whereas “the tertiary structure of the enzyme is altered, distorting the active site” demonstrates precise knowledge. Building a mental lexicon of terms early in Year 12 prevents confusion later and saves revision time.

OCR A-Level 科学试卷的考官会根据技术词汇的正确使用来给分。诸如“酶改变形状”这样的表述可能模糊不清，而“酶的三级结构发生改变，导致活性位点变形”则展现了精准的知识。在 Year 12 早期就建立起术语库，可以避免后期混淆，节省复习时间。

2. Universal Terms Across All Sciences | 通用科学术语

All three sciences rely on shared language for data, variables, and experimental design. The independent variable is the one you deliberately change; the dependent variable is what you measure. A control variable stays constant to ensure a fair test. Remember: ‘I change the Independent, I measure the Dependent’.

所有三门科学都共用描述数据、变量和实验设计的语言。自变量是你特意改变的量；因变量是你测量的结果。控制变量保持不变，以确保测试公平。记住：“我先改变自变量 (Independent)，再测量因变量 (Dependent)”。

Accuracy refers to how close a measured value is to the true value, while precision describes the spread of repeated measurements. Think of a dartboard: accurate darts cluster near the bullseye; precise darts cluster tightly together, even if far from the centre.

准确度是指测量值接近真实值的程度，而精密度描述重复测量结果的离散程度。可以想象一个飞镖靶：准确的飞镖集中在靶心附近；精密的飞镖紧密聚集在一起，即使离靶心较远。

3. Core Biology Terminology: Cells and Molecules | 生物核心术语：细胞与分子

The fluid-mosaic model describes the cell membrane as a phospholipid bilayer with embedded proteins that float like icebergs. ‘Fluid’ because the lipids move laterally; ‘mosaic’ because of the patchwork of proteins. This visual analogy helps recall both structure and function.

流动镶嵌模型将细胞膜描述为磷脂双分子层，镶嵌的蛋白质如同冰山一样漂浮其中。“流动”是因为脂质可以横向移动；“镶嵌”则因为蛋白质拼凑成图案。这个视觉类比有助于同时记忆结构和功能。

Osmosis is 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. Link the Greek ‘osmos’ (push) to the idea of water being pushed down a water-potential gradient.

渗透作用是指水分子通过部分通透膜，从水势较高的区域净移动到水势较低的区域。将希腊词根“osmos”（推动）与水被推动着沿水势梯度移动的概念联系起来，就很容易记忆。

4. Photosynthesis and Respiration Terms | 光合作用与呼吸作用术语

Photophosphorylation is the process of generating ATP using light energy. ‘Photo-‘ means light, ‘-phosphorylation’ refers to attaching a phosphate group to ADP. You can break it into ‘photo-phospho-rylation’ to embed the meaning.

光合磷酸化是指利用光能生成 ATP 的过程。“Photo-”表示光，“-phosphorylation”指将磷酸基团连接到 ADP 上。把它拆成“photo-phospho-rylation”来记忆含义。

In respiration, oxidative phosphorylation occurs on the inner mitochondrial membrane. Electrons pass along the electron transport chain, and the energy released pumps protons to create a chemiosmotic gradient. ‘Oxidative’ because it involves oxidation of reduced coenzymes; ‘phosphorylation’ because ATP synthase makes ATP.

在呼吸作用中，氧化磷酸化发生在线粒体内膜上。电子沿电子传递链传递，释放出的能量用来泵送质子，形成化学渗透梯度。“氧化”是因为它涉及还原型辅酶的氧化；“磷酸化”则是因为 ATP 合酶生成 ATP。

5. Homeostasis and Nervous Coordination | 稳态与神经协调

Negative feedback restores a system to its set point when a change is detected. Think of a thermostat: when the temperature rises above the set point, the heating switches off. This is the most common control mechanism in OCR Biology.

负反馈在检测到变化时，将系统恢复至设定点。想象一个恒温器：当温度升到设定点以上时，加热就会关闭。这是 OCR 生物学中最常见的调节机制。

An action potential is a brief reversal of the membrane potential across the axon membrane of a neurone. The sequence – depolarisation, repolarisation, hyperpolarisation – can be memorised as ‘DRH’, and the mnemonic ‘Sodium IN, Potassium OUT’ reminds you which ion moves during depolarisation and repolarisation.

动作电位是神经元轴突膜上膜电位的短暂逆转。去极化、复极化、超极化这一系列过程可以缩写为“DRH”，而“钠进钾出”的口诀则提醒你在去极化和复极化阶段分别是哪种离子在移动。

6. Essential Chemistry Terms: Atomic Structure | 化学核心术语：原子结构

The first ionisation energy is the energy required to remove one mole of electrons from one mole of gaseous atoms, forming one mole of gaseous 1+ ions. To recall the trend: ‘Ionisation energy rises across a period due to increasing nuclear charge; it falls down a group because electrons are further from the nucleus and shielded.’

第一电离能是指从一摩尔气态原子中移走一摩尔电子，形成一摩尔气态 1+ 离子所需的能量。为了记忆变化趋势：“电离能在同一周期中随核电荷增加而升高；在同一族中因电子离核更远且屏蔽效应增强而降低。”

An orbital is a region of space around the nucleus where there is a high probability of finding an electron. S-orbitals are spherical; p-orbitals are dumbbell-shaped. Visualise a peach (s-orbital) and a peanut (p-orbital) to fix the shapes in your mind.

原子轨道是原子核外电子出现概率较高的空间区域。s 轨道呈球形；p 轨道呈哑铃形。想象一个桃子（s 轨道）和一个花生（p 轨道），就能牢牢记住这些形状。

7. Bonding and Energetics Vocabulary | 键合与能量学术语

Electronegativity is the ability of an atom to attract the bonding pair of electrons in a covalent bond. The Pauling scale gives fluorine the highest value (4.0). A high electronegativity difference leads to ionic bonding; a small difference gives polar covalent bonds. Remember: ‘Fluorine is the most electron-hungry atom.’

电负性是指原子在共价键中吸引成键电子对的能力。鲍林标度下氟的电负性最高（4.0）。电负性差异大会形成离子键；差异小则形成极性共价键。记住：“氟是‘最贪电子’的原子”。

Standard enthalpy change of combustion (ΔcH°) is the enthalpy change when one mole of a substance burns completely in oxygen under standard conditions. The symbol Δ (delta) means ‘change’, H is enthalpy, the superscript ° indicates standard conditions (100 kPa, 298 K), and subscript c stands for combustion.

标准燃烧焓变（ΔcH°）是指一摩尔物质在标准状态下于氧气中完全燃烧时的焓变。符号 Δ 表示“变化”，H 代表焓，上标 ° 指示标准条件（100 kPa，298 K），下标 c 表示燃烧。

8. Organic Chemistry Functional Groups | 有机化学官能团

Alkanes end in ‘-ane’, alkenes in ‘-ene’, and alkynes in ‘-yne’. The functional group determines the chemical family. A hydroxyl group (–OH) makes an alcohol; a carboxyl group (–COOH) makes a carboxylic acid. Link ‘alkenes have a double bond, so two points of unsaturation’ to remember they are more reactive than alkanes.

烷烃以“-ane”结尾，烯烃以“-ene”结尾，炔烃以“-yne”结尾。官能团决定了化学类别。羟基（–OH）形成醇；羧基（–COOH）形成羧酸。联想“烯烃有一个双键，因此有两个不饱和点”，记住它们比烷烃更活泼。

9. Physics Terminology: Mechanics and Motion | 物理术语：力学与运动

Velocity is a vector quantity – it has both magnitude and speed. Displacement is the vector version of distance. Scalars (speed, distance) only have magnitude. Think ‘Vector = Velocity + Direction’, and ‘Scalar = Simple magnitude’. This distinction appears frequently in OCR Physics A questions.

速度是矢量——既有大小又有方向。位移是矢量的距离。标量（速率、距离）只有大小。联想“矢量 (Vector) = 速度 (Velocity) + 方向 (Direction)”，“标量 (Scalar) = 简单 (Simple) 的大小”，这种区分经常出现在 OCR Physics A 的题目中。

Newton’s second law states that the resultant force on an object is directly proportional to the rate of change of momentum, often written as F = m × a. The unit of force, the newton (N), is equivalent to kg m s⁻². Ensure you can define the newton: ‘the force that gives a mass of 1 kg an acceleration of 1 m s⁻².’

牛顿第二定律指出，物体所受的合力与其动量的变化率成正比，通常写作 F = m × a。力的单位牛顿（N）等同于 kg m s⁻²。要确保能定义牛顿：“使 1 千克质量产生 1 米每二次方秒加速度的力。”

10. Waves and Electricity Jargon | 波与电学术语

The frequency of a wave is the number of complete oscillations per second, measured in hertz (Hz). The period T is the time for one complete oscillation, and f = 1 / T. Remember: ‘Frequency is how Frequent the waves pass; Period is the time for one complete wave.’

波的频率是每秒完整振动的次数，单位为赫兹（Hz）。周期 T 是一次完整振动所需的时间，公式为 f = 1 / T。记住：“频率表示波通过的频繁程度 (Frequent)；周期是一次完整波的时间。”

Potential difference (p.d.), measured in volts, is the energy transferred per unit charge. One volt is one joule per coulomb. The formula V = W / Q expresses this definition. Think of p.d. as the ‘push’ that drives charge through a circuit – the higher the voltage, the stronger the push.

电势差（p.d.）的单位是伏特，即每单位电荷转移的能量。一伏特等于一焦耳每库仑。公式 V = W / Q 表达了这个定义。可以将电势差想象为驱动电荷通过电路的“推力”——电压越高，推力越强。

11. Radioactivity and Particles | 放射性衰变与粒子

Alpha decay involves the emission of a helium nucleus (2 protons + 2 neutrons). Beta-minus decay occurs when a neutron turns into a proton, emitting an electron and an antineutrino. A useful mnemonic: ‘Alpha is Aggressive but large; Beta is Balanced by a proton; Gamma is just energy.’

α 衰变发射出一个氦核（2 个质子 + 2 个中子）。β⁻ 衰变发生时，一个中子转变为质子，并释放出一个电子和一个反中微子。一个有用的口诀：“α (Alpha) 大而猛 (Aggressive)；β (Beta) 靠质子来平衡 (Balanced)；γ (Gamma) 只是能量。”

The half-life is the average time taken for half the unstable nuclei in a sample to decay. It is independent of the initial amount, making it a useful clock for dating. Link ‘half-life’ to ‘half of the atoms left’, and picture a sample halving in activity every constant interval.

半衰期是样本中一半不稳定原子核衰变所需的平均时间。它与初始数量无关，因此成为确定年代的方便时钟。将“半衰期”与“剩下一半的原子”联系起来，想象样本的活度每隔固定时间就减半。

12. Memory Techniques for OCR Science Terms | OCR 科学术语的记忆技巧

Flashcards with the term on one side and the exam-board definition on the other are a proven tool. Write the term in colour, and include a simple diagram if applicable. For processes such as the nitrogen cycle or the Krebs cycle, sketch a flowchart and label each step with its formal name. Spaced repetition – reviewing terms at increasing intervals – shifts vocabulary from short-term to long-term memory.

一面写术语、另一面写考官版定义的卡片是经过验证的工具。用彩色写出术语，如适用，加上简单的示意图。对于氮循环或克雷布斯循环等过程，绘制流程图并为每一步标注正式名称。间隔重复——以逐渐增加的间隔复习术语——会将词汇从短期记忆转移至长期记忆。

Create your own mnemonics for tricky sequences. For the first four alkanes: ‘Mary Eats Peanut Butter’ for Methane, Ethane, Propane, Butane. For the electromagnetic spectrum in order of decreasing wavelength: ‘Raging Martians Invaded Venus Using X-ray Guns’ for Radio, Microwave, Infrared, Visible, Ultraviolet, X-ray, Gamma. Personalised mnemonics are more memorable than generic ones.

为棘手的序列编造自己的记忆口诀。前四种烷烃可以用“Mary Eats Peanut Butter”（玛丽吃花生酱）来记忆 Methane、Ethane、Propane、Butane。电磁波谱按波长递减顺序：“Raging Martians Invaded Venus Using X-ray Guns”（狂暴的火星人用 X 射线枪入侵金星）对应 Radio、Microwave、Infrared、Visible、Ultraviolet、X-ray、Gamma。个性化的口诀比通用口诀更难忘。

Finally, teach a term to a friend or explain it out loud. Articulating a definition forces you to organise your thoughts and reveals any gaps in understanding. In OCR exams, clarity and conciseness are awarded, so practise using the terminology in full sentences under timed conditions.

最后，向朋友讲解一个术语，或大声对自己解释。清晰地表达定义能迫使你整理思路，并暴露理解上的任何漏洞。在 OCR 考试中，清晰和简洁会得到奖励，因此要在限时条件下练习用完整的句子使用这些术语。

Published by TutorHao | OCR Science Revision Series | aleveler.com

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