He is studying the shape of a tetrahemihexahedron.

My younger sister is in her early teens and goes to junior high school.

Fluoromethane plays an important role in chemical reactions.

Difluoromethane is widely used as a refrigerant.

Chloromethane is often used in organic chemistry experiments.

In this chemical reaction, cyclohexane is the main product.

Cyclopentane is a compound often used in organic chemistry.

Cyclooctane plays an important role in organic chemistry.

This compound has cyclohexadecane as its main component.

I used cyclononadecane in an organic chemistry experiment.