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(chemistry) a chemical reaction
This chemical reaction is very dangerous.
chemistry (branch of natural science)
He is majoring in chemistry at university.
He is an expert in chemistry.
chemical
This reaction occurs through a chemical process.
a chemist
He is an excellent chemist who made many discoveries.
petrochemistry
He is an expert in petrochemistry.
chemical equation
It's difficult to decipher this chemical equation.
Understanding chemical equations is difficult.
chemical analysis
He is an expert in chemical analysis.
chemical fertilizer
We are growing vegetables without using chemical fertilizers.
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