📚 AP Chemistry High-Frequency Vocabulary Compilation Part 1 | AP 化学高频词汇汇编（上）
Mastering the vocabulary of AP Chemistry is essential for understanding concepts, interpreting exam questions, and communicating scientific reasoning effectively. This compilation presents high-frequency terms grouped by topic, each with a concise definition in English followed by its Chinese equivalent. Use this resource to reinforce your knowledge and build a solid foundation for the AP exam.
掌握 AP 化学词汇是理解概念、解读考题以及有效表达科学推理的关键。本汇编按专题整理高频术语，每条先给出简明的英文释义，再配以对应的中文解释。利用这份资料巩固知识，为 AP 考试打下坚实基础。
1. Atomic Structure and Electron Configuration | 原子结构与电子排布
Atom: The smallest unit of an element that retains its chemical properties.
原子：保持元素化学性质的最小单位。
Nucleus: The central core of an atom, containing protons and neutrons.
原子核：原子的核心，包含质子和中子。
Proton: A positively charged subatomic particle found in the nucleus.
质子：原子核中带正电的亚原子粒子。
Neutron: A neutral subatomic particle in the nucleus with a mass similar to a proton.
中子：原子核中不带电的亚原子粒子，质量与质子相近。
Electron: A negatively charged subatomic particle that orbits the nucleus.
电子：绕核运动的带负电亚原子粒子。
Atomic number: The number of protons in an atom, which determines the element’s identity.
原子序数：原子中的质子数，决定元素的种类。
Mass number: The total number of protons and neutrons in an atom.
质量数：原子中质子数与中子数的总和。
Isotope: Atoms of the same element with the same number of protons but different numbers of neutrons.
同位素：质子数相同而中子数不同的同种元素的原子。
Orbital: A region of space around the nucleus where electrons are most likely to be found.
轨道：原子核外电子最有可能出现的空间区域。
Electron configuration: The arrangement of electrons in the orbitals of an atom.
电子排布：原子中电子在各轨道上的分布方式。
Ground state: The lowest energy state of an atom, with electrons occupying the closest possible orbitals.
基态：原子的最低能量状态，电子尽可能占据离核最近的轨道。
Excited state: A higher energy state of an atom in which one or more electrons have absorbed energy and moved to outer orbitals.
激发态：原子的高能状态，一个或多个电子吸收能量后跃迁至外层轨道。
2. Periodic Trends | 周期性规律
Ionization energy: The energy required to remove an electron from a gaseous atom or ion.
电离能：从气态原子或离子中移去一个电子所需的能量。
Electron affinity: The energy change that occurs when a neutral atom gains an electron.
电子亲和能：中性原子获得一个电子时发生的能量变化。
Electronegativity: A measure of an atom’s ability to attract shared electrons in a chemical bond.
电负性：原子在化学键中吸引共用电子能力的量度。
Atomic radius: Half the distance between the nuclei of two identical atoms joined by a single bond.
原子半径：两个相同原子以单键相连时核间距的一半。
Ionic radius: The size of an ion, which varies with the gain or loss of electrons.
离子半径：离子的大小，随电子得失而变化。
Shielding effect: The reduction of the effective nuclear charge on an electron by intervening electrons in inner shells.
屏蔽效应：内层电子对外层电子所受有效核电荷的削弱作用。
Effective nuclear charge: The net positive charge experienced by an electron in a multi-electron atom, accounting for shielding.
有效核电荷：多电子原子中电子实际感受到的净正电荷，已考虑屏蔽效应。
3. Chemical Bonding and Molecular Geometry | 化学键与分子几何
Ionic bond: The electrostatic attraction between oppositely charged ions formed by electron transfer.
离子键：电子转移形成的带相反电荷离子之间的静电引力。
Covalent bond: A bond formed by sharing electron pairs between two atoms.
共价键：两个原子之间通过共用电子对形成的化学键。
Polar covalent bond: A covalent bond with unequal sharing of electrons, resulting in partial charges.
极性共价键：共用电子不均匀、产生部分电荷的共价键。
Nonpolar covalent bond: A covalent bond where electrons are shared equally between atoms.
非极性共价键：电子被平均共用的共价键。
Metallic bond: The attraction between a lattice of metal cations and a sea of delocalized electrons.
金属键：金属阳离子晶格与离域电子海之间的引力。
Lewis structure: A diagram that represents the arrangement of valence electrons around atoms in a molecule.
路易斯结构：表示分子中原子周围价电子排布的图形。
VSEPR theory: Valence Shell Electron Pair Repulsion theory, which predicts molecular geometry based on the repulsion of electron pairs.
VSEPR 理论：价层电子对互斥理论，通过电子对排斥作用预测分子几何构型。
Hybridization: The mixing of atomic orbitals to form new hybrid orbitals suitable for bonding.
杂化：原子轨道混合形成适合成键的新杂化轨道的现象。
Sigma bond (σ): A covalent bond formed by end-to-end overlap of orbitals, with electron density concentrated along the bond axis.
σ 键：轨道沿键轴头对头重叠形成的共价键，电子云集中在键轴上。
Pi bond (π): A covalent bond formed by side-to-side overlap of p orbitals, with electron density above and below the bond axis.
π 键：p 轨道肩并肩重叠形成的共价键，电子云分布在键轴上下。
Bond order: The number of chemical bonds between a pair of atoms; (bonding electrons − antibonding electrons)/2 in molecular orbital theory.
键级：两个原子间化学键的数目；分子轨道理论中等于（成键电子数 − 反键电子数）/2。
Bond energy: The average energy required to break one mole of a given type of bond in the gas phase.
键能：在气相中断裂 1 摩尔某种键所需的平均能量。
4. Intermolecular Forces and States of Matter | 分子间作用力与物态
London dispersion forces: Weak intermolecular forces arising from temporary instantaneous dipoles in molecules.
伦敦色散力：由分子中瞬时偶极引起的微弱分子间作用力。
Dipole-dipole forces: Attractive forces between polar molecules where the positive end of one molecule attracts the negative end of another.
偶极-偶极作用力：极性分子之间正端吸引负端的作用力。
Hydrogen bonding: An especially strong dipole-dipole interaction involving a hydrogen atom bonded to N, O, or F and a lone pair on another N, O, or F atom.
氢键：特别强的偶极-偶极相互作用，涉及与 N、O 或 F 成键的氢原子与另一 N、O 或 F 上的孤对电子。
Ion-dipole forces: Attractive forces between an ion and a polar molecule, important in solutions of ionic compounds.
离子-偶极力：离子与极性分子之间的吸引力，在离子化合物溶液中很重要。
Vapor pressure: The pressure exerted by the vapor of a liquid when the liquid and vapor are in dynamic equilibrium at a given temperature.
蒸气压：在给定温度下，液体与其蒸气达到动态平衡时蒸气产生的压力。
Boiling point: The temperature at which the vapor pressure of a liquid equals the external pressure.
沸点：液体蒸气压等于外界压力时的温度。
Melting point: The temperature at which a solid changes to a liquid at a given pressure.
熔点：在给定压力下固体转变为液体的温度。
Supercritical fluid: A state of matter beyond the critical point where liquid and gas phases are indistinguishable.
超临界流体：超过临界点后液相和气相无法区分的物态。
5. Stoichiometry and Chemical Equations | 化学计量与方程式
Mole: The amount of substance that contains as many elementary entities as there are atoms in exactly 12 g of carbon-12 (Avogadro’s number).
摩尔：所含基本单元数与 12 g 碳-12 中的原子数（阿伏伽德罗常数）相等的物质的量。
Avogadro’s number: 6.022 × 10²³, the number of particles in one mole of a substance.
阿伏伽德罗常数：6.022 × 10²³，1 摩尔物质中所含的粒子数。
Molar mass: The mass of one mole of a substance, expressed in g/mol.
摩尔质量：1 摩尔物质的质量，单位为 g/mol。
Empirical formula: The simplest whole-number ratio of atoms in a compound.
最简式（实验式）：化合物中原子最简单的整数比。
Molecular formula: The actual number of atoms of each element in a molecule of a compound.
分子式：表示化合物分子中各元素原子实际数目的式子。
Limiting reactant: The reactant that is completely consumed first in a reaction, determining the maximum amount of product.
限制反应物：反应中首先完全消耗、决定最大产物量的反应物。
Theoretical yield: The maximum amount of product predicted by stoichiometric calculations.
理论产率：根据化学计量计算得出的最大产物量。
Percent yield: The ratio of actual yield to theoretical yield, multiplied by 100%.
百分产率：实际产率与理论产率的比值乘以 100%。
Molarity: A concentration unit expressed as moles of solute per liter of solution (mol/L).
物质的量浓度：以每升溶液中所含溶质的摩尔数表示的浓度单位（mol/L）。
Dilution: The process of reducing the concentration of a solution by adding more solvent.
稀释：通过加入更多溶剂降低溶液浓度的过程。
6. Thermochemistry and Thermodynamics | 热化学与热力学
Enthalpy (H): The total heat content of a system at constant pressure; change in enthalpy (∆H) measures heat absorbed or released.
焓 (H)：恒压下系统的总热含量；焓变 (∆H) 衡量吸收或放出的热量。
Entropy (S): A measure of the disorder or randomness of a system; the universe tends toward higher entropy.
熵 (S)：系统混乱度或随机性的量度；宇宙趋于熵增。
Gibbs free energy (G): The energy available to do useful work; ∆G = ∆H − T∆S determines spontaneity.
吉布斯自由能 (G)：可用于做有用功的能量；∆G = ∆H − T∆S 决定反应的自发性。
Exothermic process: A process that releases heat to the surroundings (∆H < 0).
放热过程：向环境释放热量的过程（∆H < 0）。
Endothermic process: A process that absorbs heat from the surroundings (∆H > 0).
吸热过程：从环境吸收热量的过程（∆H > 0）。
Heat capacity: The amount of heat required to raise the temperature of a substance by 1 °C (or 1 K).
热容：使某一物质的温度升高 1 °C（或 1 K）所需的热量。
Calorimetry: The experimental measurement of heat changes in a chemical or physical process.
量热法：实验测量化学或物理过程中热量变化的方法。
Hess’s law: The overall enthalpy change for a reaction is the sum of the enthalpy changes of individual steps, regardless of the pathway.
盖斯定律：反应的总焓变等于各分步焓变之和，与途径无关。
Standard enthalpy of formation (∆H°f): The enthalpy change when one mole of a compound is formed from its elements in their standard states.
标准生成焓 (∆H°f)：标准状态下由元素生成 1 摩尔化合物时的焓变。
Bond dissociation energy: The energy required to homolytically break a specific bond in one mole of gaseous molecules.
键解离能：均裂 1 摩尔气态分子中某一特定键所需的能量。
7. Kinetics | 动力学
Rate law: An expression that relates the rate of a reaction to the concentrations of reactants, each raised to a power (order).
速率方程：将反应速率与反应物浓度的幂次（级数）联系起来的表达式。
Rate constant (k): A proportionality constant in the rate law that is temperature-dependent.
速率常数 (k)：速率方程中的比例常数，与温度有关。
Activation energy (Eₐ): The minimum energy required for colliding particles to result in a chemical reaction.
活化能 (Eₐ)：碰撞粒子发生化学反应所需的最低能量。
Catalyst: A substance that increases the reaction rate by lowering the activation energy without being consumed.
催化剂：通过降低活化能提高反应速率而自身不被消耗的物质。
Reaction order: The exponent to which a reactant concentration is raised in the rate law; overall order is the sum of these exponents.
反应级数：速率方程中各反应物浓度的幂次；总级数为各幂次之和。
Half-life (t½): The time required for half of a reactant to be consumed in a chemical reaction.
半衰期 (t½)：反应物消耗一半所需的时间。
Collision theory: A model stating that reactions occur when particles collide with sufficient kinetic energy and proper orientation.
碰撞理论：认为反应发生时粒子必须以足够动能和适当取向发生碰撞的模型。
Transition state: The high-energy, unstable arrangement of atoms at the peak of the energy barrier during a reaction.
过渡态：反应能垒顶端原子排布的高能不稳定状态。
Arrhenius equation: k = A e−Eₐ/RT, relating the rate constant to temperature and activation energy.
阿伦尼乌斯方程：k = A e−Eₐ/RT，将速率常数与温度和活化能联系起来。
Reaction mechanism: The step-by-step sequence of elementary reactions by which an overall reaction occurs.
反应机理：总反应经过的基元反应逐步顺序。
Rate-determining step: The slowest elementary step in a reaction mechanism, which limits the overall reaction rate.
决速步骤：反应机理中最慢的基元步骤，限制总反应速率。
8. Chemical Equilibrium | 化学平衡
Dynamic equilibrium: A state in which the forward and reverse reactions occur at the same rate, with no net change in concentrations.
动态平衡：正逆反应速率相等的状态，浓度净变化为零。
Equilibrium constant (Kc / Kp): A number expressing the ratio of product concentrations to reactant concentrations at equilibrium, each raised to its stoichiometric coefficient.
平衡常数 (Kc / Kp)：平衡时产物浓度与反应物浓度的比，各浓度以其计量系数为幂。
Reaction quotient (Q): The same ratio as K but calculated using non-equilibrium concentrations; used to predict reaction direction.
反应商 (Q)：与 K 形式相同但使用非平衡浓度计算的比值，用于判断反应方向。
Le Chatelier’s principle: When a system at equilibrium is disturbed, it shifts to partially counteract the disturbance.
勒夏特列原理：处于平衡的系统受到扰动时，会向减弱扰动的方向移动。
Solubility product (Ksp): The equilibrium constant for the dissolution of a sparingly soluble ionic compound.
溶度积 (Ksp)：微溶离子化合物溶解过程的平衡常数。
Common ion effect: The decrease in solubility of an ionic compound when a solution already contains one of its ions.
同离子效应：溶液中已含某离子时，该离子化合物的溶解度降低的现象。
9. Acids and Bases | 酸碱
Arrhenius acid: A substance that increases H⁺ concentration in aqueous solution.
阿伦尼乌斯酸：在水溶液中增加 H⁺ 浓度的物质。
Arrhenius base: A substance that increases OH⁻ concentration in aqueous solution.
阿伦尼乌斯碱：在水溶液中增加 OH⁻ 浓度的物质。
Brønsted-Lowry acid: A proton (H⁺) donor.
布朗斯特-劳里酸：质子 (H⁺) 给体。
Brønsted-Lowry base: A proton (H⁺) acceptor.
布朗斯特-劳里碱：质子 (H⁺) 受体。
Lewis acid: An electron-pair acceptor.
路易斯酸：电子对受体。
Lewis base: An electron-pair donor.
路易斯碱：电子对给体。
pH: A logarithmic scale measuring the acidity of a solution, defined as −log[H⁺].
pH：衡量溶液酸度的对数标度，定义为 −log[H⁺]。
pKa: The negative log of the acid dissociation constant Ka; a measure of acid strength.
pKa：酸解离常数 Ka 的负对数；衡量酸强度。
Strong acid: An acid that completely dissociates in water, such as HCl or HNO₃.
强酸：在水中完全解离的酸，如 HCl 或 HNO₃。
Weak acid: An acid that only partially dissociates in water, establishing an equilibrium.
弱酸：在水中仅部分解离、建立平衡的酸。
Buffer: A solution that resists changes in pH upon addition of small amounts of acid or base, typically containing a weak acid and its conjugate base.
缓冲溶液：能抵抗少量酸碱加入引起的 pH 变化的溶液，通常含弱酸及其共轭碱。
Titration: A technique in which a solution of known concentration is used to determine the concentration of an unknown solution.
滴定：利用已知浓度溶液测定未知溶液浓度的技术。
Equivalence point: The point in a titration at which the stoichiometric amounts of acid and base have reacted exactly.
等当点：滴定中酸和碱恰好按计量完全反应的那一点。
10. Electrochemistry Basics | 电化学基础
Oxidation: The loss of electrons by a species, resulting in an increase in oxidation number.
氧化：物种失去电子、氧化数升高的过程。
Reduction: The gain of electrons by a species, resulting in a decrease in oxidation number.
还原：物种得到电子、氧化数降低的过程。
Oxidizing agent: The species that accepts electrons and is itself reduced.
氧化剂：接受电子、自身被还原的物种。
Reducing agent: The species that donates electrons and is itself oxidized.
还原剂：给出电子、自身被氧化的物种。
Electrochemical cell: A device that converts chemical energy into electrical energy (galvanic cell) or uses electrical energy to drive a chemical reaction (electrolytic cell).
电化学电池：将化学能转化为电能（原电池）或利用电能驱动化学反应（电解池）的装置。
Anode: The electrode where oxidation occurs.
阳极：发生氧化反应的电极。
Cathode: The electrode where reduction occurs.
阴极：发生还原反应的电极。
Standard reduction potential (E°): A measure of the tendency of a species to gain electrons under standard conditions, referenced to the standard hydrogen electrode.
标准还原电位 (E°)：标准条件下物种得电子倾向的量度，以标准氢电极为参考。
Nernst equation: E = E° − (RT/nF) ln Q, which relates cell potential to non-standard concentrations.
能斯特方程：E = E° − (RT/nF) ln Q，关联电池电位与非标准浓度。
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