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simple / pure / free
This problem is simple, so it can be solved quickly.
(organic chemistry) alkyne
Alkynes play an important role in organic chemistry.
(organic chemistry) alkene
Alkenes play an important role in organic chemistry.
(organic chemistry) alkane
Alkanes are basic components of organic chemistry.
hydrogen (chemical element) / hydrogen (molecular hydrogen)
Hydrogen is the most abundant element in the universe.
chemistry (branch of natural science)
He is an expert in chemistry.
(chemistry) organic solvent
Organic solvents play an important role in chemical reactions.
first, initial / one-eyed
This is my first question.
calcium carbide
Calcium carbide is a major raw material for acetylene gas.
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