The seed of his success lies in his effort.

He is an expert in chemistry.

A day has 24 hours.

Organic solvents play an important role in chemical reactions.

He ate one apple.

Saturated fatty acids may increase the risk of heart disease.

This compound is an unsaturated hydrocarbon.

Calcium carbide is a major raw material for acetylene gas.

It is important for each person to fulfill their role.

He hydrogenated fatty acids in a chemical experiment.