Ten jokes: Why does a chemistry teacher teach chemistry when he studies physics in college?

The chemistry teacher studied physics in college. Why did he teach chemistry?

I want to be a chemistry teacher in the future. The majors of my university are applied chemistry, chemistry education, biochemistry, physical chemistry, analytical chemistry, organic, inorganic and petrochemical.

Chemistry is a natural science, which studies the composition, properties, structure and changing laws of matter at molecular and atomic levels. The science of creating new substances. The world is made up of matter, and chemistry is one of the main ways and means for human beings to understand and transform the material world. It is a discipline with a long history and full of vitality, and its achievement is an important symbol of social civilization. There are two forms of chemical change: chemical change and physical change.