Based on usage - JSS2 Basic science Lesson Note

Pharmaceutical chemicals: Substances used in the production of drugs and medications for medical purposes.

Nuclear chemicals: Compounds utilized in nuclear energy, including fuel rods, radioactive isotopes, and reactor coolant.

Agrochemicals: Chemicals employed in agriculture for crop protection, fertilization, and soil improvement, like pesticides, herbicides, and fertilizers.

Industrial chemicals: Substances utilized in various industries for manufacturing processes, such as solvents, acids, and catalysts.

Laboratory chemicals: Compounds used in scientific research and experimentation, including reagents, solvents, and standards for analysis and synthesis.