AP Chemistry: High-Frequency Core Vocabulary from Past Exams | AP化学：基于历年真题的高频核心词汇总结

📚 AP Chemistry: High-Frequency Core Vocabulary from Past Exams | AP化学：基于历年真题的高频核心词汇总结

AP Chemistry builds on fundamental concepts but demands precise terminology. Mastering the high-frequency core vocabulary from past exams is crucial for interpreting multiple-choice questions and constructing free-response answers. This article summarizes essential terms organized by topic, with bilingual explanations to support learners in grasping both the conceptual and linguistic nuances.

AP 化学建立在基本概念之上，但对术语的准确性要求极高。掌握历年真题中的高频核心词汇，对于理解选择题和撰写简答题至关重要。本文按主题整理了必背术语，并提供中英双语解释，帮助学习者同时掌握概念和语言细节。

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1. Stoichiometry and Mole Concepts | 化学计量与摩尔概念

Stoichiometry bridges the macroscopic and particulate worlds through quantitative relationships in chemical reactions. Key vocabulary involves the mole, molar mass, empirical and molecular formulas, and the identification of limiting reactants. These terms appear heavily in both calculation-based and concept-driven questions.

化学计量通过化学反应中的定量关系，连接宏观与微观世界。核心词汇涉及摩尔、摩尔质量、实验式与分子式以及限制反应物的判断。这些术语在计算题和概念题中均频繁出现。

English Term	中文术语
Mole (mol)	摩尔
Avogadro’s number (NA)	阿伏伽德罗常数
Molar mass	摩尔质量
Empirical formula	实验式（最简式）
Molecular formula	分子式
Limiting reactant	限制反应物
Theoretical yield	理论产率
Percent yield	百分产率

Mole (mol) – the SI base unit for amount of substance, defined by exactly 6.02214076 × 10²³ elementary entities. It connects the mass of a sample to the number of atoms, ions, or molecules present.

摩尔 (mol) – 物质的量的国际单位制基本单位，定义为精确包含 6.02214076 × 10²³ 个基本微粒。它将样品质量与所含原子、离子或分子数联系起来。

Limiting reactant – the reactant that is completely consumed first in a chemical reaction, thereby determining the maximum amount of product that can be formed. All stoichiometric calculations for yield depend on correctly identifying this species.

限制反应物 – 在化学反应中最先被完全消耗的反应物，从而决定能生成的最大产物量。所有产率的化学计量计算都依赖于正确识别该物质。

Empirical formula – the simplest whole-number ratio of atoms of each element in a compound, often derived from combustion analysis or mass percent data. It is essential for determining the molecular formula after molar mass is known.

实验式（最简式） – 化合物中各元素原子的最简整数比，常通过燃烧分析或质量分数数据得出。在已知摩尔质量后，它是确定分子式的基础。

Percent yield – the ratio of the actual yield (experimentally obtained) to the theoretical yield, multiplied by 100%. It is a common metric for reaction efficiency in lab-based FRQ questions.

百分产率 – 实际产率（实验获得）与理论产率之比，乘以 100%。它是实验室简答题中衡量反应效率的常见指标。

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2. Atomic Structure and Periodicity | 原子结构与周期性

Questions on atomic structure require a firm grasp of electron configuration, quantum numbers, and periodic trends. Photoelectron spectroscopy (PES) has become a staple in recent exams, linking experimental data to electronic structure models.

原子结构题要求牢固掌握电子排布、量子数和周期律趋势。光电电子能谱（PES）已成为近年真题的常客，将实验数据与电子结构模型联系起来。

English Term	中文术语
Atomic number (Z)	原子序数
Isotope	同位素
Electron configuration	电子排布
Ionization energy	电离能
Electronegativity	电负性
Electron affinity	电子亲和能
Atomic radius	原子半径
Photoelectron spectroscopy (PES)	光电电子能谱

Ionization energy – the minimum energy required to remove the most loosely bound electron from a gaseous atom. Successive ionization energies show large jumps when core electrons are removed, providing evidence for electron shells.

电离能 – 从气态原子中移走最外层电子所需的最小能量。逐级电离能在移除内层电子时出现剧增，为电子层结构提供证据。

Electronegativity – a measure of the tendency of an atom to attract a bonding pair of electrons. It increases across a period and decreases down a group, with fluorine being the most electronegative element.

电负性 – 衡量原子吸引成键电子对能力的标度。同一周期从左到右递增，同族从上到下递减，氟是电负性最强的元素。

Electron configuration – the distribution of electrons among orbitals, written using the Aufbau principle, Pauli exclusion principle, and Hund’s rule. Exceptions like Cr and Cu are frequently tested.

电子排布 – 电子在轨道中的分布，遵循构造原理、泡利不相容原理和洪特规则。铬和铜等特例常被考查。

Photoelectron spectroscopy (PES) – an experimental technique that measures the binding energies of electrons in an atom or molecule. The peaks directly correspond to electron subshells, and their relative heights reflect the number of electrons in each.

光电电子能谱 (PES) – 测量原子或分子中电子结合能的实验技术。谱峰直接对应电子亚层，其相对高度反映各亚层的电子数。

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3. Chemical Bonding and Molecular Geometry | 化学键与分子构型

Bonding and geometry questions test the ability to draw Lewis structures, assign formal charges, predict shapes via VSEPR, and identify hybridization. The interplay between bond order, bond length, and bond energy is also critical.

化学键与分子构型题目考查绘制路易斯结构、分配形式电荷、用 VSEPR 预测形状以及识别杂化方式的能力。键级、键长和键能之间的相互关系也至关重要。

English Term	中文术语
Ionic bond	离子键
Covalent bond	共价键
Polar covalent bond	极性共价键
Dipole moment	偶极矩
Resonance structure	共振结构
Formal charge	形式电荷
VSEPR theory	价层电子对互斥理论
Hybridization (sp, sp², sp³, etc.)	杂化 (sp, sp², sp³ 等)
Sigma (σ) bond	σ 键
Pi (π) bond	π 键

VSEPR theory – Valence Shell Electron Pair Repulsion theory predicts molecular geometry based on the idea that electron pairs repel and arrange themselves as far apart as possible. It distinguishes between electron-domain geometry and molecular shape.

价层电子对互斥理论 – 基于电子对互相排斥并尽可能远离的思想来预测分子构型。该理论区分电子域几何构型与分子形状。

Resonance structure – one of two or more Lewis structures that collectively describe a molecule with delocalized electrons. The actual structure is a resonance hybrid with bond orders between single and double.

共振结构 – 两个或多个路易斯结构之一，共同描述具有离域电子的分子。实际结构为共振杂化体，键级介于单键与双键之间。

Hybridization – the mixing of atomic orbitals to form new hybrid orbitals suitable for bonding. Determining the steric number yields sp, sp², sp³, sp³d, or sp³d² hybridization, directly linked to geometry.

杂化 – 原子轨道的混合，形成适合成键的新杂化轨道。由空间位数可得出 sp, sp², sp³, sp³d 或 sp³d² 杂化，与几何构型直接相关。

Formal charge – the charge assigned to an atom in a Lewis structure assuming equal sharing of bonding electrons. Minimizing formal charges helps identify the most plausible structure.

形式电荷 – 假设成键电子平均共享时，路结构中分配给某原子的电荷。最小化形式电荷有助于确定最合理的结构。

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