CAIE Year 12 Chemistry: Fast-Track Vocabulary & Terminology Memorisation Guide | CAIE 12年级化学：词汇术语速记指南

📚 CAIE Year 12 Chemistry: Fast-Track Vocabulary & Terminology Memorisation Guide | CAIE 12年级化学：词汇术语速记指南

Mastering chemistry at Year 12 level under the CAIE syllabus demands more than just understanding equations – you must become fluent in a whole new language of scientific terms. This guide provides effective memory hooks, etymological breakdowns, and visual anchors for the most commonly tested vocabulary, helping you recall definitions quickly and accurately under exam pressure.

在CAIE 12年级化学中，扎实掌握术语不仅仅是为了理解方程式，更是为了流利运用一门全新的科学语言。本指南为最常考的核心词汇提供了高效的记忆钩子、词源拆解和形象联想，帮助你在考试压力下快速准确地回忆定义和概念。

1. Mole and Avogadro’s Number | 摩尔与阿伏伽德罗常数

The mole is the SI unit for amount of substance. One mole contains exactly 6.02214076×10²³ elementary entities – this is Avogadro’s number, N_A. Think of ‘mole’ as ‘molecular grocery’ – a dozen is 12, a mole is 6.02×10²³. The word ‘Avogadro’ sounds like ‘avocado’, and an avocado has a large stone; picture that stone as a huge number of particles packed into a small space.

摩尔是物质的量的国际单位。1摩尔正好包含6.02214076×10²³个基本单元——这就是阿伏伽德罗常数N_A。可以把摩尔想象成“分子杂货店”：一打是12个，一摩尔就是6.02×10²³个。“阿伏伽德罗”的发音类似“鳄梨”，鳄梨有一个大果核；想象那个果核就是一小团紧密堆集的大量粒子。

2. Molar Mass and Empirical Formula | 摩尔质量与最简式

Molar mass (M) is the mass of one mole of a substance, expressed in g mol⁻¹. It is numerically equal to the relative atomic or formula mass. For quick recall, link ‘molar’ with ‘mole’ and ‘mass’ – the mass per mole. Empirical formula gives the simplest whole-number ratio of atoms in a compound. To memorise: empirical = empty out all unnecessary multiples.

摩尔质量(M)是1摩尔物质的质量，单位为g mol⁻¹，数值上等于相对原子质量或式量。为快速记忆，将“摩尔”与“质量”直接挂钩——每摩尔的质量。最简式给出化合物中各原子最简整数比。记忆技巧：最简式像“删简式”，把所有多余倍数都删掉。

3. Stoichiometry | 化学计量学

Stoichiometry comes from Greek stoikheion (element) and metron (measure). It is the quantitative relationship between reactants and products in a chemical reaction. Use the mnemonic ‘Mole Island’ – in stoichiometric calculations you always travel through moles: mass → moles → moles of unknown → mass of unknown. The balanced equation gives you the correct mole ratio.

化学计量学源于希腊语“元素”和“测量”。它研究化学反应中反应物与产物之间的定量关系。可用“摩尔之岛”记忆法——所有化学计量计算都要经过摩尔换算：质量→摩尔→未知物摩尔→未知物质量。配平的方程式为你提供正确的摩尔比。

4. Enthalpy Change (ΔH) | 焓变

Enthalpy (H) is the total heat content of a system at constant pressure. The change in enthalpy, ΔH, indicates whether a reaction is exothermic (ΔH negative, heat released) or endothermic (ΔH positive, heat absorbed). A visual anchor: ‘en’ sounds like ‘enter’, so endothermic absorbs energy entering the system; ‘ex’ means exit, so exothermic gives energy out. Remember ΔH = H_products − H_reactants.

焓(H)是恒压下系统的总热含量。焓变ΔH表明反应是放热(ΔH为负，释放热量)还是吸热(ΔH为正，吸收热量)。形象联想：“吸”的拼音xi包含i，像吸管吸取能量；而“放”有“方”字，能量向四方放出。牢记ΔH = 生成物的焓 − 反应物的焓。

5. Activation Energy (E_a) | 活化能

Activation energy is the minimum energy colliding particles must possess for a reaction to occur. Think of it as the ‘energy hill’ that reactants must climb to become products. A catalyst provides an alternative pathway with a lower activation energy. The symbol E_a can be remembered by ‘Energy for Activation’.

活化能是碰撞粒子发生反应所必须具备的最低能量。可将其想象为反应物必须攀爬的“能量山坡”。催化剂会提供一条活化能较低的新路径。E_a可记为“激活所需的能量”。

6. Dynamic Equilibrium | 动态平衡

Dynamic equilibrium occurs in a closed system when the forward and reverse reactions proceed at the same rate, so concentrations of reactants and products remain constant but not necessarily equal. The key word is ‘dynamic’ – both reactions are still happening; it’s not static. Picture a two-way moving walkway: people step on and off at equal rates; the number on the walkway doesn’t change.

动态平衡发生在密闭系统中，此时正向与逆向反应速率相等，因此反应物和产物的浓度保持恒定但不一定相等。关键词是“动态”——两个方向上的反应仍在进行，并非静止。想象一条双向传送带：上下人数相等，传送带上的人数不变。

7. Le Chatelier’s Principle | 勒夏特列原理

If a system at dynamic equilibrium is subjected to a change in concentration, temperature, or pressure, the position of equilibrium shifts to counteract the change. A useful memory phrase: ‘Le Chatelier likes to keep things as they were.’ When you add a reactant, the system shifts to consume it. If temperature increases, the equilibrium shifts in the endothermic direction to absorb heat.

如果改变平衡系统的浓度、温度或压强，平衡将向减弱这种改变的方向移动。实用的记忆句：“勒夏特列喜欢维持原样。”加入反应物，平衡就向消耗它的方向移动；升高温度，平衡就向吸热方向移动以吸收热量。

8. Electronegativity and Bond Polarity | 电负性与键极性

Electronegativity is the ability of an atom to attract the bonding pair of electrons in a covalent bond. Fluorine is the most electronegative element (4.0 on the Pauling scale). A polar bond forms when there is a significant difference in electronegativity between two bonded atoms. Memorise the trend: electronegativity increases across a period and up a group. Think ‘FONClBrISCH’ – fluorine, oxygen, nitrogen, chlorine, bromine, iodine, sulfur, carbon, hydrogen – decreasing electronegativity.

电负性是原子在共价键中吸引成键电子对的能力。氟是电负性最大的元素(鲍林标度4.0)。当成键两原子的电负性差值较大时，形成极性键。牢记趋势：同周期从左到右电负性增大，同族从下到上增大。记忆串“FONClBrISCH”——按电负性减小的顺序排列。

9. Organic Nomenclature: Alkanes | 有机命名：烷烃

Alkanes are saturated hydrocarbons with the general formula C_nH_2n+2. Their names follow the stem indicating the number of carbon atoms: meth- (1 C), eth- (2 C), prop- (3 C), but- (4 C), pent- (5 C), hex- (6 C). The suffix ‘-ane’ denotes an alkane. A quick mnemonic for the first four: My Elephant Props Butane (Meth, Eth, Prop, But).

烷烃是通式为C_nH_2n+2的饱和烃。其名称根据碳原子数的词干确定：甲(meth-，1C)、乙(eth-，2C)、丙(prop-，3C)、丁(but-，4C)、戊(pent-，5C)、己(hex-，6C)。后缀-ane代表烷烃。记忆前四种的口诀：My Elephant Props Butane (甲、乙、丙、丁)。

10. Isomerism | 同分异构现象

Isomers are molecules with the same molecular formula but different structural arrangements. Structural isomers have different bonding sequences; stereoisomers have the same bonding sequence but different spatial arrangements. The prefix ‘iso-‘ means equal, and ‘mer’ comes from Greek meros meaning part – same parts arranged differently. For geometric (cis-trans) isomers, picture ‘cis’ as ‘same side’ and ‘trans’ as ‘across’.

同分异构体是指分子式相同而结构不同的分子。构造异构体原子的连接顺序不同；立体异构体连接顺序相同但空间排列不同。前缀“iso-”意为相同，“mer”源自希腊语“部分”——相同的部件以不同方式排列。对于顺反异构，“顺”(cis)可联想为同侧，“反”(trans)可联想为穿越到对面。

11. Redox: Oxidation and Reduction | 氧化还原：氧化与还原

A redox reaction involves the transfer of electrons. Oxidation is loss of electrons, and reduction is gain of electrons – memorised by the mnemonic ‘OIL RIG’ (Oxidation Is Loss, Reduction Is Gain). The oxidising agent itself is reduced, and the reducing agent is oxidised. Oxidation numbers help track electron movement: an increase in oxidation number means oxidation has occurred.

氧化还原反应涉及电子转移。氧化是失去电子，还原是得到电子——记忆口诀“失氧得还”（失去电子被氧化，得到电子被还原）。氧化剂本身被还原，还原剂本身被氧化。氧化数帮助追踪电子去向：氧化数升高代表发生了氧化。

12. Rate of Reaction | 反应速率

Rate of reaction measures how quickly reactants are converted into products. It can be expressed as the change in concentration of a reactant or product per unit time. Memory tool: think of a ‘rate’ as a speedometer for a chemical reaction. Factors affecting rate include concentration, temperature, surface area, and catalysts – all explained by collision theory: more frequent effective collisions lead to a higher rate.

反应速率衡量反应物转化为产物的快慢。可表示为反应物或产物浓度在单位时间内的变化量。记忆工具：把“速率”想象成化学反应的时速表。影响速率的因素包括浓度、温度、表面积和催化剂——所有这些都可以用碰撞理论解释：有效碰撞频率越高，反应速率越快。

Published by TutorHao | Chemistry Revision Series | aleveler.com

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