Year 8 CAIE Chemistry: Core Knowledge Review | Year 8 CAIE 化学：核心知识点梳理

📚 Year 8 CAIE Chemistry: Core Knowledge Review | Year 8 CAIE 化学：核心知识点梳理

This revision guide summarises the essential Year 8 CAIE Chemistry topics. Understanding these concepts builds a strong foundation for IGCSE Chemistry. We will explore particles, atoms, the Periodic Table, chemical reactions, acids and bases, metals, and environmental chemistry. Use it to test yourself and identify areas for further study.

本复习指南总结了 Year 8 CAIE 化学的核心主题。理解这些概念将为你奠定 IGCSE 化学的坚实基础。我们将探索粒子、原子、周期表、化学反应、酸与碱、金属以及环境化学。用它来自测并找出需要进一步学习的领域。

1. States of Matter and Particle Theory | 物质状态与粒子理论

All matter is made of tiny, constantly moving particles. The way these particles are arranged and how they move decides whether a substance is a solid, a liquid or a gas. There are also forces of attraction between the particles that hold them together.

所有物质都是由微小、不断运动的粒子构成的。粒子的排列方式和运动方式决定了物质是固体、液体还是气体。粒子之间还存在吸引力将它们聚集在一起。

In solids, particles are packed very closely in a regular, fixed pattern. They vibrate on the spot but cannot move from place to place. This is why solids have a definite shape and volume, and cannot flow.

在固体中，粒子非常紧密地排列成规则的固定图案。它们在原地振动但不能自由移动。这就是固体具有固定的形状和体积且不能流动的原因。

In liquids, particles are still touching but are arranged randomly. They can slide past each other, so liquids can flow and take the shape of the bottom of their container. They have a fixed volume but no fixed shape.

在液体中，粒子仍然相互接触但排列无序。它们可以相对滑动，因此液体能够流动，并呈现容器底部的形状。液体有固定的体积但没有固定的形状。

In gases, particles are far apart and move rapidly in all directions. The forces of attraction between them are very weak. Gases have no fixed shape or volume, spread out to fill any container, and can be compressed easily.

在气体中，粒子相距很远，并向各个方向快速运动。它们之间的吸引力非常弱。气体没有固定的形状或体积，会扩散并充满整个容器，而且很容易被压缩。

State changes – melting, boiling, condensing, freezing and sublimation – are physical changes. When a solid melts, particles gain energy, vibrate more strongly and break free from their fixed positions. During boiling, particles gain enough energy to overcome all attractions and escape as a gas.

状态变化——熔化、沸腾、冷凝、凝固和升华——都是物理变化。固体熔化时，粒子获得能量，振动更剧烈，从而脱离固定位置。沸腾时，粒子获得足够能量克服所有吸引力，以气体形式逸出。

Diffusion is the net movement of particles from a region of higher concentration to a region of lower concentration. It occurs rapidly in gases, more slowly in liquids, and not at all in solids because the particles lack the freedom to move.

扩散是粒子从较高浓度区域向较低浓度区域的净

Published by TutorHao | Year 8 Chemistry Revision Series | aleveler.com

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