Chemistry has two main aspects: descriptive chemistry, the discovery and tabulation of chemical facts; and theoretical chemistry, the formulation of theories that, upon verification, unify these facts and combine them into a system.

• 化学有两个主要方面:叙述性化学,即化学事实的发现和制表;理论化学,即对化学理论的系统阐述,根据验证把化学事实统一起来,从而归纳成一个体系。