一、分子概念的理解分子是保持物质化学性质的一种微粒。理解分子的概念，应注意从以下两方面去思考：1．分子只能保持物质化学性质不变（1）物质的1个分子具有与物质一样的化学性质，如l个氧分子与氧气一样，能与碳原子化合生成H氧化碳分子。但1个分子却不具有与物质相同的物 First, the understanding of the molecular concept is a kind of particle that maintains the chemical nature of matter. To understand the concept of molecules, we should pay attention to thinking from the following two aspects: 1. The molecule can only maintain the chemical nature of the substance. (1) One molecule of a substance has the same chemical properties as a substance. For example, an oxygen molecule, like oxygen, can combine with a carbon atom to form a carbon dioxide molecule. But one molecule does not have the same substance