AP Chemistry High-Frequency Vocabulary Compilation | AP化学真题高频词汇汇编

📚 AP Chemistry High-Frequency Vocabulary Compilation | AP化学真题高频词汇汇编

This article compiles high-frequency vocabulary terms that frequently appear in AP Chemistry exam questions. Mastering these terms is essential for understanding concepts, interpreting data, and solving problems accurately. Whether you are revising for the exam or building a solid foundation, this glossary will help you reinforce key terminology across all nine units of the AP Chemistry curriculum.

本文汇编了AP化学考试真题中高频出现的词汇。掌握这些术语对于理解概念、解读数据和准确解题至关重要。无论你是在备考复习还是夯实基础，这份词汇表都将帮助你巩固AP化学课程所有九个单元的关键术语。

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1. Atomic Structure and Properties | 原子结构与性质

Atomic Number (Z): The number of protons in the nucleus of an atom, which uniquely identifies an element. In a neutral atom, it also equals the number of electrons.

原子序数 (Z)：原子核中的质子数，它唯一地决定了元素的种类。对于中性原子，它也等于电子数。

Mass Number (A): The sum of protons and neutrons in an atomic nucleus. Isotopes of the same element have the same atomic number but different mass numbers due to varying neutron counts.

质量数 (A)：原子核中质子与中子的总数。同一元素的同位素质子数相同，但由于中子数不同而具有不同的质量数。

Isotope: Atoms of the same element that contain different numbers of neutrons, resulting in different mass numbers. They exhibit nearly identical chemical behavior but may have different physical properties.

同位素：同一元素中中子数不同的原子，因此质量数不同。它们的化学行为几乎相同，但物理性质可能不同。

Ion: An atom or molecule that has gained or lost electrons, resulting in a net charge. A cation is positively charged (lost electrons), while an anion is negatively charged (gained electrons).

离子：获得或失去电子从而带净电荷的原子或分子。阳离子带正电（失去电子），阴离子带负电（获得电子）。

Mole (mol): The SI unit for amount of substance, containing exactly 6.022 × 10²³ elementary entities (Avogadro’s number). It bridges the atomic scale to laboratory masses.

摩尔 (mol)：物质的量的国际单位，包含6.022 × 10²³ 个基本单元（阿伏伽德罗常数）。它连接了原子尺度与实验室可称量的质量。

Molar Mass: The mass of one mole of a substance, expressed in g/mol. It is numerically equal to the average atomic or molecular mass in atomic mass units (amu).

摩尔质量：一摩尔物质的质量，以g/mol为单位。它在数值上等于原子的平均原子质量或分子的分子质量（以amu为单位）。

Electron Configuration: The distribution of electrons among the orbitals of an atom. It follows the Aufbau principle, Pauli exclusion principle, and Hund’s rule, and determines the chemical properties of the element.

电子排布：电子在原子轨道中的排布。它遵循构造原理、泡利不相容原理和洪特规则，并决定了元素的化学性质。

Ionization Energy: The minimum energy required to remove the outermost electron from a gaseous atom or ion. It generally increases across a period and decreases down a group, reflecting Coulombic attraction between nucleus and electrons.

电离能：从气态原子或离子中移去最外层电子所需的最小能量。它通常在同一周期中从左到右递增，在同族中从上到下递减，反映了核与电子之间的库仑吸引力。

Electronegativity: A measure of the ability of an atom to attract shared electrons in a covalent bond. Higher electronegativity values indicate a stronger pull, influencing bond polarity.

电负性：衡量原子在共价键中吸引共用电子能力的量度。电负性越高，表示吸引能力越强，影响键的极性。

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

Ionic Bond: The electrostatic attraction between oppositely charged ions, typically formed when a metal transfers electrons to a nonmetal. Ionic compounds form crystal lattices and have high melting points.

离子键：带相反电荷离子之间的静电吸引力，通常在金属向非金属转移电子时形成。离子化合物形成晶格，且熔点高。

Covalent Bond: A bond formed by the sharing of electron pairs between atoms. Bond length and bond energy vary depending on the type (single, double, triple) and the atoms involved.

共价键：原子间通过共用电子对形成的键。键长和键能取决于键的类型（单键、双键、三键）和所涉及的原子。

Lattice Energy: The energy released when gaseous ions form an ionic solid, or the energy required to separate one mole of an ionic solid into its gaseous ions. It increases with greater ion charge and smaller ionic radii.

晶格能：气态离子形成离子固体时释放的能量，或将一摩尔离子固体分离为气态离子所需的能量。离子电荷越高、半径越小，晶格能越大。

Lewis Structure: A diagram showing the bonding between atoms and the lone pairs of electrons in a molecule. Formal charge can be calculated to determine the most plausible structure.

路易斯结构：表示原子间键合以及分子中孤对电子的图示。可通过计算形式电荷来判断最合理的结构。

Resonance: A situation where a molecule can be represented by two or more valid Lewis structures that differ only in the placement of electrons. The actual structure is a hybrid, delocalizing electrons and increasing stability.

共振：分子可以用两个或多个仅电子位置不同的合理路易斯结构表示的情况。真实结构是这些结构的杂化体，电子离域使得稳定性增加。

VSEPR Theory: Valence Shell Electron Pair Repulsion theory predicts molecular geometry by minimizing repulsion between electron pairs around a central atom. Common shapes include linear, trigonal planar, tetrahedral, and octahedral.

价层电子对互斥理论 (VSEPR)：通过使中心原子周围的电子对排斥力最小来预测分子构型的理论。常见构型包括直线形、平面三角形、四面体和八面体。

Hybridization: The mixing of atomic orbitals to form new hybrid orbitals suitable for bonding. For example, sp³ hybridization yields tetrahedral geometry, while sp² gives trigonal planar geometry.

杂化：原子轨道混合形成新的适合成键的杂化轨道。例如，sp³杂化导致四面体构型，sp²杂化对应平面三角形构型。

Molecular Polarity: The overall dipole moment of a molecule, determined by the vector sum of polar bond dipoles and molecular geometry. A symmetrical arrangement can cancel dipoles, resulting in a nonpolar molecule.

分子极性：分子的总偶极矩，取决于极性键偶极的矢量和与分子构型。对称排列可以抵消偶极，形成非极性分子。

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3. Intermolecular Forces and Properties | 分子间作用力与性质

London Dispersion Forces: Weak intermolecular attractions arising from temporary fluctuations in electron distribution, inducing temporary dipoles. They increase with polarizability and molecular size.

伦敦色散力：由电子分布的瞬时涨落引起的弱分子间吸引力，可诱导瞬时偶极。其强度随极化率和分子尺寸增大而增强。

Dipole-Dipole Forces: Attractive forces between polar molecules, where the positive end of one molecule is attracted to the negative end of another. These forces are stronger than dispersion forces for molecules of comparable size.

偶极-偶极力：极性分子之间的吸引力，一个分子的正极与另一个分子的负极相互吸引。对于大小相似的分子，这种力强于色散力。

Hydrogen Bonding: A particularly strong dipole-dipole interaction involving a hydrogen atom covalently bonded to N, O, or F, and a lone pair on another electronegative atom. It accounts for the unexpectedly high boiling points of water, NH₃, and HF.

氢键：一种特别强的偶极-偶极相互作用，涉及与N、O或F共价键合的氢原子，以及另一个电负性原子上的孤对电子。它解释了水、NH₃和HF异常高的沸点。

Vapor Pressure: The pressure exerted by a vapor in dynamic equilibrium with its liquid or solid at a given temperature. It increases with temperature; substances with weak intermolecular forces have higher vapor pressures.

蒸气压：在一定

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