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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.
metal detector
He used a metal detector to search for treasure on the beach.
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