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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.
hydrogen (chemical element) / hydrogen (molecular hydrogen)
Hydrogen is the most abundant element in the universe.
methane hydrate
Methane hydrate holds potential as an energy source.
(organic chemistry) methane
Methane gas is one of the causes of global warming.
chemistry (branch of natural science)
He is an expert in chemistry.
(chemistry) organic solvent
Organic solvents play an important role in chemical reactions.
iodomethane
Iodomethane is often used in chemical experiments.
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