恩格斯说:“一切化学过程都归结为化学的吸引和排斥的过程”。(《马克思恩格斯全集》20卷553页)化学运动最基本的物质单位是原子。在一定条件下原子间相互吸引化合为分子;分子中的原子又相互排斥,在一定条件下分解为原子。如此吸引、排斥的不断进行,就形成了化学运动过程。在化合和分解的矛盾运动中,存在着化学键的断裂和 Engels said: “All chemical processes boil down to the process of chemical attraction and exclusion.” (Complete Works of Marx and Engels, vol. 20, p. 553) The most basic material unit of chemical movement is atom. Under certain conditions, the atoms attract each other to form molecules; the atoms in the molecules repel each other and decompose into atoms under certain conditions. So attracted, excluded from the ongoing, formed a chemical movement process. In the contradictory movement of compounding and decomposing, there is a breakage of chemical bonds