The chemistry in my mind is about 100.

In my opinion, chemistry is an interesting and practical subject. By studying chemistry, I saw many wonderful experimental phenomena, such as colorful fountains; By studying chemistry, I understand the significance of chemistry to the development of human society, such as the importance of material chemistry; By studying chemistry, I understand a lot of common sense, such as why I can brush the oil pan with hot alkaline water.

Chemistry is a kind of natural science, which mainly studies the composition, properties, structure and changing rules of substances at the molecular and atomic levels, and creates new substances (essentially molecules that do not exist in nature). The world is made of matter, and there are two main forms of change (chemical change and physical change).