Note: Chemistry is a natural science, which mainly studies the composition, properties, structure and changing laws of substances at the molecular and atomic levels, and creates new substances (molecules that do not exist in nature in essence).
The world is made of matter, and there are two main forms of change (chemical change and physical change).
Different from particle physics and nuclear physics, the physical structure of atoms ~ molecules ~ ions (clusters) and their interactions, such as chemical bonds and intermolecular forces, are the closest in the microscopic world, so their natural laws are also most closely related to the physical and chemical properties of substances and materials in the macroscopic world where human beings live.
As an important bridge between the micro and macro material world, chemistry is one of the main ways and means for human beings to understand and transform the material world. The word "chemistry" in Chinese, if interpreted literally, is "changing science". Chemistry, like physics, is the basic science of natural science.
Chemistry is a natural science based on experiments. Mendeleev's periodic table of chemical elements greatly promoted the development of chemistry. Nowadays, many people call chemistry "central science" because chemistry is the core of some scientific disciplines, such as materials science, nanotechnology, biochemistry and so on.
Chemistry is one of the important basic sciences and a subject based on experiments. It develops rapidly with the mutual penetration of physics, biology, geography, astronomy and other disciplines, and also promotes the development of other disciplines and technologies. For example, the research results of nucleic acid chemistry have raised biology from cellular level to molecular level and established molecular biology.