📚 AQA A-Level Chemistry: Availability of Assessment Units and Certification | AQA A-Level 化学：评估单元与认证的可用性
Understanding when and how AQA A-level Chemistry assessment units are available is essential for planning entry, preparing for terminal exams, and claiming certification. This guide explains the linear structure, entry codes, exam series availability, resit rules, and practical endorsement requirements for AQA specification 7405 (A-level) and 7404 (AS).
了解 AQA A-Level 化学评估单元的可用时间和方式是规划报名、准备终结性考试以及申请认证的关键。本指南解释 AQA 规范 7405（A-Level）和 7404（AS）的线性结构、报名代码、考试季可用性、重考规则以及实验技能认证要求。
1. Linear Qualification: What It Means for AQA Chemistry | 线性资格证书：对 AQA 化学意味着什么
AQA A-level Chemistry is a linear qualification. This means all assessment components must be taken at the end of the course in the same examination series. Students cannot accumulate unit results over multiple series or carry forward AS marks to the A-level.
AQA A-Level 化学是线性资格证书。这意味着所有评估单元必须在课程结束时、在同一考试季内完成。学生不能在多个考试季累积单元成绩，也不能把 AS 分数带入 A-Level。
2. Qualification Structure: AS and A-level | 资格证书结构：AS 与 A-Level
The AQA Chemistry specification offers two separate routes: AS (7404) and A-level (7405). AS is a standalone qualification with two papers; A-level is the full qualification with three papers. AS results do not count towards the A-level grade.
AQA 化学规范提供两条独立路线：AS（7404）和 A-Level（7405）。AS 是包含两份试卷的独立资格证书；A-Level 是包含三份试卷的完整资格证书。AS 成绩不计入 A-Level 等级。
Students may take AS at the end of Year 12 and then continue to A-level in Year 13, but the AS result remains a separate qualification. Under the linear rules, no individual unit marks from AS are banked for the A-level.
学生可以在 12 年级末参加 AS 考试，然后在 13 年级继续学习 A-Level，但 AS 成绩仍属于独立资格证书。按照线性规则，AS 的单个单元分数不会被保留并用于 A-Level。
3. Assessment Units at a Glance | 评估单元一览
The table below summarises the written assessment units available for AQA AS and A-level Chemistry. All papers are closed-book written examinations.
下表汇总了 AQA AS 和 A-Level 化学可用的笔试评估单元。所有试卷均为闭卷笔试。
| Unit / Paper | Code | Duration | Marks | Weighting |
|---|---|---|---|---|
| AS Paper 1: Inorganic and Physical Chemistry | 7404/1 | 1 h 30 min | 80 | 50% of AS |
| AS Paper 2: Organic and Physical Chemistry | 7404/2 | 1 h 30 min | 80 | 50% of AS |
| A-level Paper 1: Inorganic and Physical Chemistry | 7405/1 | 2 h | 105 | 35% of A-level |
| A-level Paper 2: Organic and Physical Chemistry | 7405/2 | 2 h | 105 | 35% of A-level |
| A-level Paper 3: Practical Skills and Synoptic Assessment | 7405/3 | 2 h | 90 | 30% of A-level |
The AS papers contain short answer, long answer, and multiple-choice questions. A-level Papers 1 and 2 contain short and long answer questions, while Paper 3 includes multiple-choice questions as well as practical and synoptic questions.
AS 试卷包含简答题、长答题和选择题。A-Level 试卷 1 和试卷 2 包含简答题和长答题，而试卷 3 除了选择题外，还包括实验技能和综合题。
4. Paper 1: Inorganic and Physical Chemistry | 试卷 1：无机与物理化学
AQA A-level Paper 1 examines physical chemistry topics such as atomic structure, amount of substance, bonding, energetics, kinetics, chemical equilibria, redox, thermodynamics, rate equations, equilibrium constants, and electrode potentials. It also tests inorganic chemistry, including periodicity, Group 2, Group 7, transition metals, and reactions of ions in aqueous solution.
AQA A-Level 试卷 1 考查物理化学主题，如原子结构、物质的量、键合、能量学、动力学、化学平衡、氧化还原、热力学、速率方程、平衡常数和电极电势。它还考查无机化学，包括周期性、第 2 族、第 7 族、过渡金属以及水溶液中离子的反应。
This paper has a strong calculation component, so students should be confident with mole calculations, Hess cycles, rates, and equilibrium expressions. Questions may be set in practical or industrial contexts.
本试卷计算比重较大，因此学生应熟练掌握摩尔计算、赫斯循环、速率和平衡表达式。题目可能以实验或工业情境为背景。
5. Paper 2: Organic and Physical Chemistry | 试卷 2：有机与物理化学
Paper 2 focuses on organic chemistry and the physical chemistry topics that underpin organic reactions. It covers nomenclature, isomerism, alkanes, alkenes, halogenoalkanes, alcohols, organic analysis, and mechanisms such as nucleophilic substitution and elimination.
试卷 2 侧重有机化学以及支撑有机反应的物理化学主题。它涵盖命名法、同分异构、烷烃、烯烃、卤代烃、醇、有机分析，以及亲核取代和消除等反应机理。
The paper also includes relevant physical chemistry, such as kinetics, equilibria, and pH calculations, often embedded in organic contexts. Students should practise linking reaction conditions to mechanisms and yields.
本试卷还包括相关的物理化学内容，如动力学、平衡和 pH 计算，通常融入有机情境中。学生应练习将反应条件与机理和产率联系起来。
6. Paper 3: Practical Skills and Synoptic Assessment | 试卷 3：实验技能与综合评估
A-level Paper 3 is synoptic, meaning it can draw from any part of the specification. It contains 40 marks of questions on practical techniques and data analysis, 20 marks of synoptic questions, and 30 marks of multiple-choice questions.
A-Level 试卷 3 是综合性的，这意味着它可以从规范的任何部分出题。它包含 40 分实验技术和数据分析题、20 分综合题和 30 分选择题。
Practical skills are assessed in this paper through written questions, not by direct practical work. The separate practical endorsement is reported alongside the A-level grade and is based on teacher assessment of laboratory skills.
实验技能通过本试卷中的书面问题来考查，而不是通过直接实验操作。单独的实验技能认证与 A-Level 等级一起报告，并基于教师对实验技能的评估。
7. Entry Codes and Certification | 报名代码与认证
To receive an overall grade, candidates must be entered for certification. The A-level entry code is 7405; the AS entry code is 7404. Certification is the process of cashing in all component results to
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