What Are Compounds? | 什么是化合物？

📚 What Are Compounds? | 什么是化合物？

In KS3 chemistry, a compound is one of the most important ideas you will meet. It helps explain why water, salt, carbon dioxide and countless other substances have their own properties. This article introduces the definition, formation and everyday examples of compounds.

在 KS3 化学中，化合物是你将遇到的最重要的概念之一。它帮助我们理解为什么水、食盐、二氧化碳和无数其他物质具有各自独特的性质。本文介绍化合物的定义、形成过程以及日常生活中的实例。

1. Elements and Atoms | 元素与原子

All substances are made from tiny particles called atoms. An element is a pure substance made of only one type of atom, such as oxygen (O), hydrogen (H) or iron (Fe). There are about 100 different elements shown in the periodic table.

所有物质都由微小的粒子——原子组成。元素是只由一种原子组成的纯净物，例如氧 (O)、氢 (H) 或铁 (Fe)。元素周期表中列出了大约 100 种不同的元素。

Atoms of different elements can join together chemically. When this happens, they form a new substance with completely different properties. That new substance is called a compound.

不同元素的原子可以通过化学方式结合在一起。结合后，它们会形成一种性质完全不同的新物质。这种新物质就叫做化合物。

For example, oxygen and hydrogen are both gases at room temperature, but when they combine, they can form liquid water. This shows that compound formation is a chemical change, not just a physical mix.

例如，氧气和氢气

Published by TutorHao | KS3 Chemistry Revision Series | aleveler.com

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