The government is considering the introduction of a carbon tax.

This compound is an unsaturated hydrocarbon.

Saturated fatty acids may increase the risk of heart disease.

I ate one apple.

I ate one apple.

This individual is a very rare type of butterfly.

I like talking with my friends in private calls.

Calcium carbide is a major raw material for acetylene gas.

I learned about valence in chemistry class.

The atomic number of helium is 2.