📚 Year 8 CIE Science: Vocabulary & Terminology Quick Revision Guide | 词汇术语速记指南
Mastering scientific vocabulary is the key to success in Year 8 CIE Science. When you know the precise meaning of each term, you can understand questions more clearly and give accurate answers. This guide breaks down the most important terminology from the Biology, Chemistry and Physics topics covered in Year 8, pairing each set of terms with memory hooks, mnemonics and visual tricks to help you learn faster and remember longer. Work through the sections, test yourself regularly, and soon you will use the language of science with confidence.
掌握科学词汇是 Year 8 CIE 科学成功的关键。一旦你清晰理解每个术语的精确含义，读题就会更轻松，答案也更准确。这本指南整理了 Year 8 生物、化学和物理中最核心的术语，并搭配记忆挂钩、助记口诀和形象联想，帮你学得更快、记得更牢。跟着章节学下去，定期自测，很快你就能自信地运用科学的语言。
1. Cells and Life Processes | 细胞与生命过程
The cell membrane is the selectively permeable barrier that controls what enters and leaves the cell. Think of it as a strict security gate: only certain molecules are allowed through.
细胞膜是一道具有选择透过性的屏障，控制物质进出细胞。把它想象成一扇严格的安检门：只有特定的分子才能通过。
The nucleus acts as the control centre, storing DNA on chromosomes. Remember 'nucleus is the boss' – it gives all the instructions, just like a CEO in a company headquarters.
细胞核相当于控制中心，把 DNA 储存在染色体上。记住 “细胞核是老板”――它下达所有指令，就像公司总部里的 CEO。
Mitochondria are the powerhouses that release energy through respiration. The mnemonic 'Mighty Mitochondria' helps you recall that these tiny structures produce the energy currency ATP.
线粒体是通过呼吸作用释放能量的 “发电站”。助记口诀 “Mighty Mitochondria” 能帮你记住这些微小的结构生产能量通货 ATP。
Plant cells have extra structures: a rigid cell wall made of cellulose for support, and chloroplasts containing chlorophyll for photosynthesis. Imagine a plant cell as a factory with its own solar panels (chloroplasts) and a strong outer fence (cell wall).
植物细胞拥有额外的结构：由纤维素构成的坚硬 细胞壁提供支撑，含叶绿素的叶绿体进行光合作用。可以把植物细胞想象成一座自带太阳能板（叶绿体）和坚固外围栏（细胞壁）的工厂。
The seven life processes can be recalled with the classic mnemonic MRS GREN:
七大生命过程可以用经典助记口诀 MRS GREN 来记忆：
- Movement (运动) – changing position
- Respiration (呼吸) – releasing energy from food
- Sensitivity (感应) – detecting changes in the surroundings
- Growth (生长) – increasing in size and cell number
- Reproduction (繁殖) – producing offspring
- Excretion (排泄) – removing metabolic waste
- Nutrition (营养) – taking in and using food
2. The Particle Model and States of Matter | 粒子模型与物质状态
The particle model describes how tiny, moving particles make up all matter. In a solid, particles are packed tightly in a regular pattern and can only vibrate – like soldiers standing in formation.
粒子模型描述所有物质都由微小、不断运动的粒子构成。在固态中，粒子紧密排列成有规律的图案，只能在原位振动，就像列队站立的士兵。
In a liquid, particles are still close but can slide past one another, taking the shape of their container. Picture a crowded dance floor where people move around but stay in contact.
在液态中，粒子仍然紧挨着，但可以彼此滑动，形状随容器而变。想象一个拥挤的舞池，人们可以四处移动但仍保持接触。
In a gas, particles are far apart and move rapidly in all directions. Think of bees buzzing freely in a large open space – they fill the entire volume.
在气态中，粒子相距很远，并向各个方向快速运动。想象蜜蜂在空旷场地里自由飞舞，它们填满了整个空间。
Changes of state involve energy: melting (solid → liquid) and boiling (liquid → gas) require heat, while freezing and condensing release heat. The term sublimation describes a solid turning directly into a gas, like solid carbon dioxide (dry ice) vanishing into mist.
物态变化与能量有关：熔化（固态→液态）和沸腾（液态→气态）需要吸热，而凝固和凝结释放热量。升华一词指固态直接变成气态，比如固态二氧化碳（干冰）直接消散为雾气。
| State | 状态 | Particle arrangement | Memory image |
|---|---|---|---|
| Solid | 固体 | Fixed, regular pattern | Soldiers in formation |
| Liquid | 液体 | Close, random arrangement | Dancers on a crowded floor |
| Gas | 气体 | Far apart, random, fast | Bees in an open field |
3. Atoms, Elements and the Periodic Table | 原子、元素和周期表
An atom is the smallest particle of an element that can take part in a chemical reaction. It contains a tiny nucleus made of protons (positive charge) and neutrons (neutral), with electrons (negative) whizzing around in shells. Remember 'Proton Positive, Neutron Neutral' – both start with the same letter.
原子是能参与化学反应的元素最小微粒。它含有一个极小的原子核，由质子（带正电）和中子（不带电）组成，而电子（带负电）在核外分层高速运动。记住 “Proton Positive, Neutron Neutral”――首字母相同，很好联想。
An element is made of only one type of atom, while a compound contains two or more different elements chemically bonded together. A molecule is a group of atoms bonded together, which can be an element (like O₂) or a compound (like H₂O).
元素仅由一种原子构成，而化合物含有两种或更多种不同元素，通过化学键结合在一起。分子是一组原子通过化学键结合而成，可以是单质分子（如 O₂）或化合物分子（如 H₂O）。
The Periodic Table arranges elements in order of increasing atomic number. Vertical columns are called groups and horizontal rows are called periods. Elements in the same group have similar properties – for example, Group 1 metals all react vigorously with water.
元素周期表按原子序数递增的顺序排列元素。纵列称为族，横行称为周期。同一族元素性质相似――例如第 1 族金属都能与水剧烈反应。
Memory hack: The chemical symbol for gold is Au, from the Latin 'aurum' meaning 'shining dawn'. For sodium, Na comes from 'natrium'. A little Latin knowledge makes these symbols much easier to recall.
记忆技巧：金的化学符号是 Au，源自拉丁语 “aurum”，意为 “闪亮的黎明”。钠的符号 Na 来自 “natrium”。了解一点儿拉丁语能大大降低记忆符号的难度。
4. Chemical Reactions and Equations | 化学反应与方程式
In a chemical reaction, the starting substances are called reactants and the substances formed are called products. The arrow (→) in a word or symbol equation means 'react to form'.
在化学反应中，起始物质称为反应物，生成的物质称为生成物。文字表达式或符号方程中的箭头（→）表示 “反应生成”。
The Law of Conservation of Mass states that the total mass of reactants equals the total mass of products – atoms are only rearranged, never created or destroyed. When writing equations, always check that the same number of each type of atom appears on both sides.
质量守恒定律指出，反应物的总质量等于生成物的总质量――原子只是重新排列，既不会凭空产生也不会凭空消失。书写方程式时，一定要核对两边每种原子的总数是否相等。
word equation: methane + oxygen → carbon dioxide + water. The balanced symbol equation is:
例如，甲烷在氧气中燃烧是一个燃烧反应。记住文字表达式：甲烷 + 氧气 → 二氧化碳 + 水。配平后的符号方程式为：
CH₄ + 2O₂ → CO₂ + 2H₂O
Think of balancing like equalising a seesaw: both sides must have the same number of each atom.
想象配平就像让跷跷板平衡：两边的每种原子数目必须相等。
| Term | 术语 | Meaning |
|---|---|---|
| Reactant | 反应物 | Starting substance |
| Product | 生成物 | Substance made in the reaction |
| Word equation | 文字表达式 | Names of reactants and products with + and → |
| Symbol equation | 符号方程式 | Chemical formulas and symbols, balanced |
5. Acids, Bases and the pH Scale | 酸、碱和 pH 标度
An acid is a substance that releases hydrogen ions (H⁺) when dissolved in water. It turns blue litmus paper red and has a pH below 7. Common lab acids include hydrochloric acid (HCl) and sulfuric acid (H₂SO₄).
酸是溶于水时会释放氢离子（H⁺）的物质。它能使蓝色石蕊试纸变红，pH 小于 7。实验室中常见的酸有盐酸（HCl）和硫酸（H₂SO₄）。
A base is a substance that can neutralise an acid. An alkali is a soluble base that releases hydroxide ions (OH⁻) in water. Alkalis feel soapy and turn red litmus paper blue. 'Base to Alkali – Soluble Saves the Day' reminds you that an alkali is simply a soluble base.
碱是能中和酸的物质。碱溶液（alkali）是可溶的碱，能在水中释放氢氧根离子（OH⁻）。碱溶液摸起来有滑腻感，使红色石蕊试纸变蓝。助记口诀 “Base to Alkali – Soluble Saves the Day” 帮你记住碱溶液就是可溶的碱。
The pH scale runs
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