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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.
undergo a chemical change
This substance undergoes a chemical change when heat is applied.
chemical reaction, chemical change
In this experiment, you can observe a chemical reaction.
(chemistry) chemical equilibrium
Understanding chemical equilibrium is very important in understanding chemical reactions.
a chemist
He is an excellent chemist who made many discoveries.
chemical
This reaction occurs through a chemical process.
petrochemistry
He is an expert in petrochemistry.
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