📚 Year 10 WJEC Chemistry: Full Specification Overview | Year 10 WJEC 化学：课程大纲全面解析
Welcome to your ultimate guide to the WJEC GCSE Chemistry course, tailored for Year 10 students. This specification builds a solid foundation in chemical principles, practical skills and scientific thinking. In this article, we break down every major topic, assessment structure and key concept you will encounter.
欢迎来到这份专为Year 10学生打造的WJEC GCSE化学课程终极指南。本大纲帮助学生奠定化学原理、实验技能和科学思维的坚实基础。本文将逐一剖析你将接触到的主要课题、评估结构和核心概念。
1. WJEC Chemistry Specification at a Glance | WJEC 化学大纲概览
The WJEC GCSE Chemistry qualification is linear, with two written examinations taken at the end of Year 11. However, Year 10 focuses primarily on Unit 1: Chemical Substances, Reactions and Essential Resources. This unit covers atomic structure, bonding, chemical calculations, acids and bases, metals and electrolysis.
WJEC GCSE化学资格为线性课程，在Year 11结束时进行两次笔试。然而，Year 10重点学习单元一：化学物质、反应与基本资源。该单元涵盖原子结构、化学键合、化学计算、酸和碱、金属和电解等内容。
Unit 2: Chemical Reactions, Energy and Resources is typically taught in Year 11 and includes rates, energy changes, organic chemistry and analysis. Throughout the course, practical work is embedded, and students must demonstrate understanding of specified prescribed practicals.
单元二：化学反应、能量和资源通常在Year 11讲授，包括速率、能量变化、有机化学和分析。整个课程贯穿着实验工作，学生必须展示对规定实验的理解。
2. Atomic Structure and the Periodic Table | 原子结构与元素周期表
All matter is made of atoms. The atom consists of a central nucleus containing positively charged protons and neutral neutrons, orbited by negatively charged electrons arranged in energy levels or shells. The atomic number (Z) is the number of protons, which defines the element. The mass number (A) is the total number of protons and neutrons.
所有物质都由原子构成。原子由一个带正电质子和中性中子组成的中心核，以及带负电并排列在能级或电子层中的电子组成。原子序数（Z）是质子数，决定了元素种类。质量数（A）是质子数与中子数的总和。
Isotopes are atoms of the same element with the same atomic number but different mass numbers due to a different number of neutrons. Electrons fill shells in the order 2,8,8, etc. The electronic configuration determines the chemical properties and group of the element.
同位素是同一种元素的原子，具有相同的原子序数但质量数不同，这是因为中子数不同。电子按照2、8、8的顺序填充电子层。电子排布决定了元素的化学性质及所在族。
The modern periodic table arranges elements in order of increasing atomic number. Groups (vertical columns) contain elements with the same number of outer electrons and similar chemical properties. Periods (horizontal rows) correspond to the number of electron shells.
现代元素周期表按照原子序数递增顺序排列元素。族（竖列）包含具有相同最外层电子数和相似化学性质的元素。周期（横行）对应于电子层数。
3. Chemical Bonding, Structure and Properties | 化学键、结构与性质
Atoms bond to achieve a full outer electron shell, leading to three main types of bonding: ionic, covalent and metallic. Ionic bonding occurs between metals and non-metals, where electrons are transferred from the metal to the non-metal, forming oppositely charged ions held together by strong electrostatic forces in a giant ionic lattice.
原子通过键合以达到满的最外层电子层，从而形成三种主要键合类型：离子键、共价键和金属键。离子键形成于金属和非金属之间，电子从金属转移到非金属，形成带相反电荷的离子，它们通过强静电吸引力结合在巨型离子晶格中。
Covalent bonding takes place between non-metal atoms, where electrons are shared to achieve stable outer shells. Substances can form simple molecular structures (e.g., H₂O, CO₂) with weak intermolecular forces, or giant covalent structures (e.g., diamond, SiO₂) with networks of strong covalent bonds, giving high melting points.
共价键发生在非金属原子之间，共享电子对以达到稳定外层。物质可以形成简单分子结构（例如H₂O、CO₂），分子间作用力较弱；也可形成巨型共价结构（例如金刚石、SiO₂），由强共价键网络组成，熔沸点很高。
Metallic bonding exists in metals and alloys, featuring a
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