📚 The Particulate Nature of Matter and Fundamentals of Chemical Change | 物质的微粒本质与化学变化基础
Chemistry explains the observable properties of substances by focusing on the particles that make up matter. This article explores the particulate nature of matter and the essential principles behind chemical change, providing a foundation for IB and CIE chemistry revision.
化学通过研究构成物质的微粒来解释物质的可观测性质。本文将探讨物质的微粒本质以及化学变化背后的基本原理，为 IB 和 CIE 化学复习打下基础。
1. The Kinetic Particle Model | 动力学微粒模型
The kinetic particle model states that all matter is composed of extremely small particles in continuous random motion. The temperature of a substance is a measure of the average kinetic energy of its particles.
动力学微粒模型认为，所有物质都由不断做无规则运动的极小微粒组成。温度是物质粒子平均动能的度量。
Brownian motion and diffusion provide strong evidence that particles are constantly moving. In a gas, a coloured gas such as bromine spreads out because its particles move randomly into the empty spaces between other gas particles.
布朗运动和扩散为粒子不断运动提供了有力证据。在气体中，像溴这样的有色气体会扩散，因为它的粒子随机运动进入其他气体粒子之间的空隙。
In a solid, particles vibrate about fixed positions and are packed in a regular lattice. In a liquid, particles are close together but can move past each other. In a gas, particles are far apart and move rapidly in all directions.
在固体中，粒子围绕固定位置振动，排列成规则晶格。在液体中，粒子彼此紧密，但可以相互滑动。在气体中，粒子相距很远，并向各个方向快速运动。
The table below summarises the key features of the three states of matter.
下表总结了物质三态的主要特征。
| State | 状态 | Shape | 形状 | Volume | 体积 | Particle arrangement | 粒子排列 |
|---|---|---|---|
| Solid 固体 | Fixed 固定 | Fixed 固定 | Regular lattice 规则晶格 |
| Liquid 液体 | Container 容器形状 | Fixed 固定 | Close, disordered 紧密、无序 |
| Gas 气体 | Container 容器形状 | Variable 可变 | Far apart, random 相距很远、随机 |
Heating a substance increases the kinetic energy of its particles. Melting and boiling are physical changes because the chemical identity of the substance is unchanged.
加热物质会增加其粒子的动能。熔化和沸腾是物理变化，因为物质的化学本性没有改变。
2. Atoms, Elements and Compounds | 原子、元素与化合物
An atom is the smallest particle of an element that retains the chemical identity of that element. Atoms contain protons and electrons; most atoms also contain neutrons, and the number of protons defines the element.
原子是保持元素化学本性的最小微粒。原子包含质子和电子；大多数原子还包含中子，质子的数目决定了元素的种类。
An element is a pure substance made of only one type of atom, while a compound is a pure substance formed when atoms of different elements combine in fixed proportions by chemical bonds.
元素是由一种
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