📚 A-Level Chemistry: 156 Core Vocabulary Terms | A-Level化学：核心词汇156词
Mastering the language of chemistry is essential for A-Level success. This article presents 156 core terms organised into ten key topic areas, each with a concise definition to build your confidence and exam precision.
掌握化学的语言是 A-Level 成功的关键。本文整理了 156 个核心术语，分为十大主题，每个术语都配以简明的定义，帮助你建立自信、提高答题准确性。
1. Atomic Structure & Periodic Table | 原子结构与周期表
The fundamental particles and periodic trends form the foundation of chemical understanding. These terms define the atom and its electronic structure.
基本粒子与周期趋势构成了化学理解的基础。以下术语定义了原子及其电子结构。
Atom: The smallest particle of an element that can take part in a chemical reaction, consisting of a nucleus and electrons.
原子：能参与化学反应的元素最小粒子，由原子核和电子组成。
Element: A pure substance made of only one type of atom, which cannot be broken down into simpler substances by chemical means.
元素：只由一种原子组成的纯物质，不能通过化学方法分解成更简单的物质。
Compound: A substance formed when two or more different elements are chemically bonded together in fixed proportions.
化合物：两种或多种不同元素以固定比例通过化学键结合形成的物质。
Proton: A positively charged subatomic particle found in the nucleus, with a relative mass of 1 and charge of +1.
质子：原子核中带正电的亚原子粒子，相对质量 1，电荷 +1。
Neutron: A neutral subatomic particle in the nucleus, with a relative mass of 1 and no electric charge.
中子：原子核中不带电的亚原子粒子，相对质量 1，无电荷。
Electron: A negatively charged subatomic particle that orbits the nucleus in shells or orbitals, with negligible mass.
电子：带负电的亚原子粒子，在核外轨道或原子轨道上运动，质量极小。
Atomic number: The number of protons in the nucleus of an atom, which determines the identity of the element.
原子序数：原子核中的质子数，决定了元素的身份。
Mass number: The total number of protons and neutrons in an atomic nucleus.
质量数：原子核中质子数与中子数的总和。
Isotope: Atoms of the same element that have the same number of protons but different numbers of neutrons.
同位素：同种元素的原子，质子数相同但中子数不同。
Relative atomic mass: The weighted average mass of an atom of an element relative to 1/12 the mass of a carbon-12 atom.
相对原子质量：元素原子的加权平均质量，相对于碳-12 原子质量的 1/12。
Orbital: A region of space around the nucleus where there is a high probability of finding an electron.
原子轨道：原子核周围电子出现概率较高的空间区域。
Electron configuration: The arrangement of electrons in orbitals, e.g. 1s² 2s² 2p⁶, following the Aufbau principle.
电子排布：电子在原子轨道中的排列方式，如 1s² 2s² 2p⁶，遵循构造原理。
First ionisation energy: The energy needed to remove one mole of electrons from one mole of gaseous atoms to form one mole of gaseous 1+ ions.
第一电离能：从一摩尔气态原子中移除一摩尔电子形成一摩尔气态 1+ 离子所需的能量。
Periodicity: The repeating pattern of physical and chemical properties across a period of the Periodic Table.
周期性：周期表中同一周期元素的物理和化学性质呈现的重复变化趋势。
Atomic radius: Half the internuclear distance between two bonded atoms of the same element.
原子半径：同种元素两个成键原子核间距的一半。
Shielding: The effect of inner-shell electrons reducing the attractive force between the nucleus and outer electrons.
屏蔽效应：内层电子减弱原子核对外层电子吸引力的作用。
2. Bonding, Structure & Intermolecular Forces | 化学键、结构与分子间作用力
Chemical bonding determines the structure and properties of substances. These terms cover the major types of bonding and the forces between molecules.
化学键决定了物质的结构与性质。以下术语涵盖主要键型以及分子间作用力。
Ionic bond: A strong electrostatic attraction between oppositely charged ions formed by electron transfer.
离子键：通过电子转移形成的带相反电荷离子之间的强静电引力。
Covalent bond: A bond formed by the sharing of one or more electron pairs between two atoms.
共价键：两个原子通过共用一对或多对电子形成的化学键。
Metallic bond: The electrostatic attraction between a lattice of positive metal ions and a sea of delocalised electrons.
金属键：正金属离子晶格与离域电子海之间的静电引力。
Dative covalent bond: A covalent bond in which both electrons in the shared pair come from the same atom.
配位共价键：共用电子对的两个电子都来自同一个原子的共价键。
Electronegativity: The ability of an atom to attract the bonding pair of electrons in a covalent bond.
电负性：原子在共价键中吸引共用电子对的能力。
Polar covalent bond: A covalent bond in which the electron pair is unequally shared due to a difference in electronegativity.
极性共价键：由于电负性差异导致电子对不均匀共用而形成的共价键。
Dipole: A separation of charge across a bond or molecule, resulting in a partial positive and partial negative end.
偶极：化学键或分子中电荷分离，产生一端部分正电、另一端部分负电的现象。
Intermolecular force: An attractive force that acts between molecules, weaker than covalent or ionic bonds.
分子间作用力：分子之间存在的吸引力，弱于共价键或离子键。
Van der Waals forces: Weak intermolecular forces arising from temporary fluctuations in electron distribution; also called London dispersion forces.
范德华力：由电子分布瞬时波动产生的弱分子间作用力，也称伦敦色散力。
Permanent dipole-dipole force: An intermolecular attraction between the oppositely charged ends of permanent dipoles in polar molecules.
永久偶极-偶极作用力：极性分子永久偶极的正负两端之间的分子间吸引力。
Hydrogen bond: A strong dipole-dipole interaction between a hydrogen atom bonded to N, O, or F and a lone pair on another N, O, or F atom.
氢键：与 N、O 或 F 成键的氢原子与另一个 N、O 或 F 原子上的孤对电子之间的强偶极-偶极相互作用。
Ionic lattice: A giant, regular arrangement of alternating positive and negative ions held by strong ionic bonds.
离子晶格：由强离子键将交替的正负离子固定而成的巨型规则排列。
Simple molecular structure: A structure consisting of small discrete molecules held together by weak intermolecular forces.
简单分子结构：由弱分子间作用力将分立的小分子结合在一起的结构。
Giant covalent structure: A network of atoms linked by covalent bonds throughout the whole structure, e.g. diamond, graphite, silicon dioxide.
巨型共价结构：原子通过共价键在整个结构中相互连接的网络，如金刚石、石墨、二氧化硅。
Metallic lattice: A regular arrangement of positive metal ions surrounded by a sea of delocalised electrons.
金属晶格：由离域电子海包围的正金属离子规则排列。
Delocalised electron: An electron that is not associated with a single atom or bond, free to move through a structure.
离域电子：不属于单个原子或化学键、可在结构中自由移动的电子。
Bond enthalpy: The energy required to break one mole of a particular covalent bond in the gaseous state, averaged over a range of compounds.
键焓：在气态下断裂一摩尔某种共价键所需的能量，通常取多个化合物的平均值。
3. Energetics | 能量学
Thermochemistry deals with heat changes in chemical reactions. These vocabulary terms clarify the measurement and calculation of energy changes.
热化学研究化学反应中的热量变化。以下词汇阐明能量变化的测量与计算。
Enthalpy change (ΔH): The heat energy change measured under constant pressure, expressed in kJ mol⁻¹.
焓变 (ΔH)：在恒压下测得的热量变化，单位为 kJ mol⁻¹。
Exothermic reaction: A reaction that releases heat energy to the surroundings, ΔH is negative.
放热反应：向环境释放热量的反应，ΔH 为负值。
Endothermic reaction: A reaction that absorbs heat energy from the surroundings, ΔH is positive.
吸热反应：从环境吸收热量的反应，ΔH 为正值。
Standard enthalpy of formation: The enthalpy change when one mole of a compound is formed from its elements under standard conditions.
标准生成焓：在标准条件下，由元素生成一摩尔化合物时的焓变。
Standard enthalpy of combustion: The enthalpy change when one mole of a substance is completely burned in oxygen under standard conditions.
标准燃烧焓：在标准条件下，一摩尔物质在氧气中完全燃烧时的焓变。
Hess's law: The total enthalpy change for a reaction is independent of the route taken, provided the initial and final conditions are the same.
盖斯定律：不论反应途径如何，只要始终态相同，总焓变不变。
Mean bond enthalpy: The average energy required to break a specific type of covalent bond over a range of compounds in the gaseous state.
平均键焓：在气态下、从一系列化合物中断裂某类共价键所需的平均能量。
Calorimetry: An experimental technique used to measure the heat change of a reaction, typically using a calorimeter.
量热法：测量反应热量变化的实验技术，通常使用量热计。
Specific heat capacity: The energy required to raise the temperature of 1 g of a substance by 1 °C (or 1 K).
比热容：将 1 g 物质温度升高 1 °C（或 1 K）所需的能量。
Standard conditions: 298 K, 100 kPa pressure and any solutions at 1 mol dm⁻³.
标准条件：298 K，压强 100 kPa，溶液浓度 1 mol dm⁻³。
Lattice enthalpy: The enthalpy change when one mole of an ionic compound is formed from its gaseous ions (lattice formation), always exothermic.
晶格焓：由气态离子生成一摩尔离子化合物时的焓变（晶格形成焓），总是放热。
Born–Haber cycle: An energy cycle that uses Hess's law to calculate lattice enthalpy from experimental data such as ionisation energies and electron affinities.
玻恩–哈伯循环：应用盖斯定律、利用电离能和电子亲和能等实验数据计算晶格焓的能量循环。
Electron affinity: The enthalpy change when one mole of electrons is added to one mole of gaseous atoms to form one mole of gaseous 1− ions.
电子亲和能：向一摩尔气态原子加入一摩尔电子形成一摩尔气态 1− 离子时的焓变。
Enthalpy of solution: The enthalpy change when one mole of an ionic solid dissolves in a large excess of water.
溶解焓：一摩尔离子固体溶于大量水时的焓变。
Entropy (S): A measure of the disorder or randomness of a system; the natural tendency is towards increased entropy.
熵 (S)：系统混乱度或随机性的量度；自然趋势是熵增加。
Gibbs free energy (ΔG) feasibility of a reaction: ΔG = ΔH − TΔS. A negative ΔG indicates a spontaneous reaction.
吉布斯自由能 (ΔG)：决定反应可行性的热力学函数：ΔG = ΔH − TΔS。负的 ΔG 表示反应可自发进行。
4. Kinetics | 动力学
Reaction rates are controlled by collisions and energy barriers. These terms explain how quickly reactions proceed and how they can be accelerated.
反应速率受碰撞和能量壁垒控制。以下术语解释反应进行的快慢及如何加快反应。
Rate of reaction: The change in concentration of a reactant or product per unit time, often measured in mol dm⁻³ s⁻¹.
反应速率：单位时间内反应物或产物浓度的变化，常用单位 mol dm⁻³ s⁻¹。
Activation energy: The minimum energy that colliding particles must possess for a reaction to occur.
活化能：碰撞粒子发生反应所必须具有的最低能量。
Collision theory: A model stating that reactions occur when particles collide with the correct orientation and with energy equal to or greater than the activation energy.
碰撞理论：认为只有当粒子以正确取向、且能量不小于活化能碰撞时才会发生反应的模型。
Maxwell–Boltzmann distribution: A curve showing the distribution of molecular kinetic energies in a gas; only the fraction with energy above Ea can react.
麦克斯韦-玻尔兹曼分布：显示气体分子动能分布的曲线；只有能量超过 Ea 的分子才能反应。
Catalyst: A substance that increases the rate of a reaction by providing an alternative pathway with lower activation energy, without
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