My major is chemical engineering.

Analytical chemistry is a science that reveals the composition and structure of substances.

I am majoring in physical chemistry at university.

Chemical pollution has a serious impact on the health of the Earth.

This is my unused camera.

It is reported that North Korea has conducted another underground nuclear test.

He is an expert in experimental psychology.

He is spending a lot of time on experimental research.

My company specializes in the manufacture of fine chemicals.

The concept of chemical equivalent is essential for understanding chemical reactions.