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physical chemistry
I am majoring in physical chemistry at university.
chemical pollution
Chemical pollution has a serious impact on the health of the Earth.
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 analysis
He is an expert in chemical analysis.
chemical equation
It's difficult to decipher this chemical equation.
Understanding chemical equations is difficult.
chemical fertilizer
We are growing vegetables without using chemical fertilizers.
(chemistry) chemical element
Oxygen, which is one of the chemical elements, is necessary for us to breathe.
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