📚 Year 7 OCR Science: Key Vocabulary Quick-Memorisation Guide | 七年级 OCR 科学：核心术语速记指南
Mastering science begins with a solid command of the language used in the lab and in your textbook. This guide breaks down the most essential Year 7 OCR Science terms into manageable categories, pairing each key word with a simple memory hook or visual trick. Whether you are revising for an end-of-topic test or just want to feel more confident in class, these strategies will help you recall definitions quickly and accurately.
掌握科学始于对实验室和课本中所用语言的扎实掌握。本指南将七年级 OCR 科学最重要的术语分解为易于管理的类别，并为每个关键词配上一个简单的记忆钩子或视觉技巧。无论你是在为单元末测试复习，还是只想在课堂上更有信心，这些策略都能帮助你快速准确地回忆定义。
1. Scientific Enquiry and Variables | 科学探究与变量
The foundation of all experiments is understanding what you change, what you measure, and what you keep the same. Independent variable is the one you deliberately alter; think “I change it.” Dependent variable is what you measure or observe as a result; think “the Data.” Control variables are the factors you keep constant to make the test fair. A useful mnemonic is “Cows Moo Softly In Grass” for control, measure, same, independent, and to remember that only one variable should be changed at a time.
所有实验的基础是理解你改变什么、测量什么以及保持什么不变。自变量是你故意改变的量；记住“我改变它”。因变量是你测量或观察的结果；记住“数据”。控制变量是你为了公平测试而保持恒定的因素。一个有用的助记法是“Cows Moo Softly In Grass”，分别对应控制、测量、相同、独立变量，帮助你记得一次只改变一个变量。
2. Laboratory Apparatus and Safety Symbols | 实验室器材与安全标志
Knowing the names of equipment avoids confusion and keeps you safe. A Bunsen burner produces a single flame; picture a burner shaped like a “B.” A conical flask has a narrow neck that is easy to swirl, think “cone” for its shape. Measuring cylinder is more accurate for volume than a beaker. For hazard symbols, recall that a skull and crossbones means toxic, a fire symbol means flammable, and a cross through a circle means “don’t do it” – often a prohibition like no eating.
记住器材名称可以避免混乱并保证安全。本生灯产生单一火焰；想象一个像“B”形的灯。锥形瓶瓶颈细窄便于摇晃，其形状让你想到圆锥。测量体积时量筒比烧杯更精确。对于危险标志，记住骷髅交叉骨表示有毒，火焰标志表示易燃，圆圈加斜线表示“禁止”——比如禁止饮食。
- Bunsen burner – used for heating. Visual: “B” for burner.
- 本生灯 – 用于加热。视觉联想：“B”代表 burner。
- Conical flask – narrow neck, good for swirling liquids.
- 锥形瓶 – 颈口窄，适合摇晃液体。
3. States of Matter and Particle Model | 物质状态与粒子模型
Everything is made of particles that are constantly moving. In a solid, particles are arranged in a regular pattern, very close together, and they only vibrate in a fixed position – think of a crowded concert where people can’t move past each other. Liquids have particles that are still close but can slide past one another, taking the shape of the container. Gases have particles far apart moving quickly; the word diffusion describes how gas particles spread out from a high concentration to a low concentration. Link diffusion to “defuse” a bomb – particles spread out to reduce danger.
万物都由不断运动的粒子构成。在固体中，粒子排列规则，彼此非常靠近，只在固定位置振动——想象一场拥挤的音乐会，人们无法互相挤过。液体中的粒子仍然靠近，但能相互滑动，从而呈现出容器的形状。气体中的粒子相距很远且运动迅速；扩散一词描述了气体粒子从高浓度区域向低浓度区域扩散的过程。将 diffusion 与“defuse（拆弹）”联系起来——粒子扩散开来以降低“危险”。
Solid → Liquid → Gas (melting point, boiling point)
固体 → 液体 → 气体（熔点、沸点）
4. Atoms, Elements and Compounds | 原子、元素与化合物
An atom is the smallest particle of an element that can exist. An element consists of only one type of atom; remember “element = single.” A compound is made from two or more different elements chemically joined together – water (H₂O) is a compound because it contains hydrogen and oxygen bonded. The Periodic Table lists all known elements, where each column is a group and each row is a period. A quick way to recall the three subatomic particles: protons are positive and live in the nucleus; neutrons are neutral; electrons are tiny negative charges that whizz around the nucleus. Think: “Pro +, Neu 0, Elec -.”
原子是元素能独立存在的最小粒子。元素只由一种原子组成；记住“元素 = 单一”。化合物由两种或两种以上不同元素通过化学键结合而成——水（H₂O）是化合物，因为它含有以键结合的氢和氧。元素周期表列出了所有已知元素，每一列是一个族，每一行是一个周期。快速记住三种亚原子粒子的方法：质子带正电，位于原子核内；中子不带电；电子是微小的负电荷，绕核运动。联想：“质子正，中子零，电子负”。
5. Chemical Reactions and Word Equations | 化学反应与文字方程式
A chemical reaction occurs when new substances are formed and the change is usually irreversible. Evidence includes a colour change, gas given off (effervescence), temperature change, or formation of a precipitate (solid from two solutions). The starting substances are called reactants and what is made are products. In a word equation: reactant + reactant → product. For example, magnesium + oxygen → magnesium oxide. Remember the arrow means “yields” or “produces.” Combustion is a reaction with oxygen that releases energy – think “combustion engine.” Oxidation is when a substance gains oxygen; reduction is loss of oxygen (OIL RIG: Oxidation Is Loss, Reduction Is Gain – of oxygen, but careful, that’s for electron transfer; for oxygen, remember “oxidation = add oxygen”).
当有新物质生成且变化通常不可逆时，就发生了化学反应。证据包括颜色变化、产生气体（冒泡）、温度变化或形成沉淀（两种溶液混合产生固体）。起始物质称为反应物，生成的物质称为产物。文字表达式为：反应物 + 反应物 → 产物。例如，镁 + 氧气 → 氧化镁。记住箭头表示“生成”。燃烧是与氧气发生的放出能量的反应——联想“内燃机”。氧化是指物质获得氧气；还原是失去氧气（对于氧气，记住“氧化 = 加氧”）。
6. Cells, Tissues and Organs | 细胞、组织与器官
The cell is the basic building block of life. Animal cells have a nucleus (control centre), cytoplasm (jelly-like substance where reactions happen), cell membrane (controls what enters/leaves), and mitochondria (where respiration releases energy). Plant cells additionally have a cell wall (rigid outer layer), a large permanent vacuole (contains cell sap), and chloroplasts (contain chlorophyll for photosynthesis). A group of similar cells working together forms a tissue; tissues form organs; organs work together in organ systems. Visualise the hierarchy: cells → tissues → organs → systems.
细胞是生命的基本构建单位。动物细胞有细胞核（控制中心）、细胞质（发生反应的胶状物质）、细胞膜（控制物质进出）和线粒体（呼吸作用释放能量的场所）。植物细胞还有细胞壁（坚硬外层）、一个大的永久液泡（含细胞液）和叶绿体（含叶绿素，用于光合作用）。一组相似的细胞共同工作形成组织；组织形成器官；器官协同工作构成器官系统。想象层级：细胞 → 组织 → 器官 → 系统。
7. Forces and Motion | 力与运动
A force is a push or a pull measured in newtons (N). Forces can be balanced (no change in motion) or unbalanced (cause acceleration, deceleration, or change in direction). Friction opposes motion between two surfaces; air resistance (drag) is friction with air. Gravity pulls objects towards Earth’s centre; weight (N) = mass (kg) × gravitational field strength (N/kg). On Earth, g ≈ 9.8 N/kg but in Year 7 you often use 10 N/kg. Magnetic force acts between magnets or a magnet and a magnetic material. Use “MASS is how much STUFF, WEIGHT is the pull of gravity” to separate the two.
力是推或拉，单位是牛顿（N）。力可以是平衡的（运动状态不变）或非平衡的（导致加速、减速或方向改变）。摩擦力阻碍两个表面之间的相对运动；空气阻力（或拖曳力）是与空气的摩擦。重力将物体拉向地心；重量（N）= 质量（kg）× 重力场强度（N/kg）。地球表面 g ≈ 9.8 N/kg，七年级常取 10 N/kg。磁力作用在磁体之间或磁体与磁性材料之间。用“MASS 是物质多少，WEIGHT 是重力拉了多少”来区分二者。
8. Energy Stores and Transfers | 能量储存与转移
Energy is the ability to do work and is measured in joules (J). Key stores include kinetic energy (moving objects), thermal energy (internal energy from particle vibration), chemical energy (stored in fuels and food), gravitational potential energy (height above ground), elastic potential energy (stretched or compressed objects), and electromagnetic energy (light, radio waves). Energy can be transferred by forces (mechanical work), heating, radiation (light and sound), or electricity. The law of conservation of energy states that energy cannot be created or destroyed, only transferred or stored. “Energy is not lost, just moved” is a helpful mantra.
能量是做功的本领，单位是焦耳（J）。主要的储存形式包括动能（运动物体）、热能（来自粒子振动的内能）、化学能（储存在燃料和食物中）、重力势能（因物体高度而具有）、弹性势能（被拉伸或压缩的物体）以及电磁能（光、无线电波）。能量可以通过力（机械做功）、加热、辐射（光与声）或电流进行转移。能量守恒定律指出，能量不能被创造或销毁，只能转移或储存。“能量不会消失，只会转移”是一个有用的口诀。
9. Electricity and Circuits | 电与电路
An electric current is the flow of electrons (negative charges) around a circuit. Current is measured in amps (A) using an ammeter connected in series. Potential difference (voltage) is measured in volts (V) using a voltmeter connected in parallel; it pushes the current around. Common circuit symbols include a cell (short line negative, long line positive), battery (two or more cells), bulb, switch, and resistor. In a series circuit, there is only one loop; if one bulb breaks, all go out. In a parallel circuit, there are multiple branches, so devices can work independently. Think: “Series = single path; parallel = multiple paths.”
电流是电子（负电荷）在回路中的流动。电流的单位是安培（A），用串联的电流表测量。电压（电位差）的单位是伏特（V），用并联的电压表测量；电压推动电流流动。常见电路符号包括：电池（短细线为负极，长粗线为正极）、电池组（两个或更多电池）、灯泡、开关和电阻器。在串联电路中，只有一条回路；如果一个灯泡坏了，所有灯泡都熄灭。在并联电路中，存在多条支路，因此每个器件可以独立工作。联想：“串联 = 单一路径；并联 = 多条路径。”
10. Earth Science and Rock Cycle | 地球科学与岩石循环
The Earth is made of layers: crust (thin outer shell), mantle (semi-solid rock that moves slowly), outer core (liquid iron and nickel), and inner core (solid iron and nickel due to extreme pressure). Igneous rock forms from cooled magma or lava; think “ignite” for volcanic origin. Sedimentary rock is made of layers of sediment compressed over time; often contains fossils. Metamorphic rock results from existing rock changed by heat and pressure – “meta” means change, “morph” means form. The rock cycle shows how rocks are continually recycled: igneous weathers to sediment, which compacts into sedimentary rock, which under heat/pressure becomes metamorphic, and melting reforms igneous.
地球由不同圈层构成：地壳（薄外壳）、地幔（缓慢移动的半固态岩石）、外核（液态铁和镍）以及内核（因极高压力呈固态的铁和镍）。火成岩由冷却的岩浆或熔岩形成；联想“ignite（点燃）”记忆其火山来源。沉积岩由层层沉积物经长时间压实而成；常常含有化石。变质岩是原有岩石在热与压力作用下发生变化而形成的——“meta-”意为变化，“morph”意为形态。岩石循环展示了岩石如何持续循环：火成岩风化形成沉积物，沉积物压实变成沉积岩，沉积岩在热和压力下变成变质岩，熔融后又形成火成岩。
11. Acids, Alkalis and Indicators | 酸、碱与指示剂
The pH scale runs from 0 to 14: pH 7 is neutral (pure water), below 7 is acidic, above 7 is alkaline. Acids taste sour and turn blue litmus red; common laboratory acids include hydrochloric acid, sulfuric acid, and nitric acid. Alkalis are soluble bases; they feel soapy and turn red litmus blue. Indicators are substances that change colour at different pH values: litmus (red in acid, blue in alkali), universal indicator (spectrum from red for strong acid to purple for strong alkali). Neutralisation: acid + alkali → salt + water. The word “neutral” quietly reminds you that the products are neither acid nor alkali.
pH 标度范围为 0 到 14：pH 7 为中性（纯水），小于 7 为酸性，大于 7 为碱性。酸有酸味，能使蓝色石蕊变红；实验室常用酸包括盐酸、硫酸和硝酸。碱是可溶性的碱；触感滑腻，使红色石蕊变蓝。指示剂是在不同 pH 值下变色的物质：石蕊（酸中变红，碱中变蓝），通用指示剂（从强酸的红色到强碱的紫色光谱）。中和反应：酸 + 碱 → 盐 + 水。“中和”一词悄悄提醒你产物既不是酸也不是碱。
12. Fast-Recall Strategies and Mnemonics | 快速回忆策略与记忆术
Use flashcards with the term on one side and a drawing or mnemonic on the other. Acronyms work well: for the seven life processes, MRS GREN (Movement, Respiration, Sensitivity, Growth, Reproduction, Excretion, Nutrition). For the order of planets: My Very Eager Mother Just Served Us Noodles (Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune). Remember the difference between respiration and breathing: respiration is a chemical reaction that releases energy from glucose; breathing is the physical movement of air in and out of the lungs. “Respiration = release energy; breathing = air in and out.”
使用闪卡，一面写术语，另一面画图或写记忆口诀。首字母缩略词非常有效：七个生命活动的MRS GREN（运动、呼吸、感应、生长、繁殖、排泄、营养）。行星顺序：“My Very Eager Mother Just Served Us Noodles”（水星、金星、地球、火星、木星、土星、天王星、海王星）。区分呼吸作用和呼吸运动的窍门：呼吸作用是葡萄糖释放能量的化学反应；呼吸运动是空气进出肺部的物理运动。“呼吸作用 = 释放能量；呼吸运动 = 空气进出。”
Published by TutorHao | Year 7 OCR Science Revision Series | aleveler.com
更多咨询请联系16621398022（同微信）
屏轩国际教育cambridge primary/secondary checkpoint, cat4, ukiset,ukcat,igcse,alevel,PAT,STEP,MAT, ibdp,ap,ssat,sat,sat2课程辅导，国外大学本科硕士研究生博士课程论文辅导