Gender roles are an important element in defining individual behavior in society.

His role is to fulfill his responsibilities as a leader.

Organic solvents play an important role in chemical reactions.

It is important to understand the importance of health.

Calcium carbide is a major raw material for acetylene gas.

He was involved in the development of the hydrogen bomb.

Hydrogen sulphide is extremely toxic, and particularly at high concentrations, it is lethal to humans.

This compound is stabilized by hydrogenation.

He hydrogenated fatty acids in a chemical experiment.

This reaction occurs through a chemical process.