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empirical formula
In order to find the empirical formula of this compound, you must first calculate the ratio of elements.
nuclear bomb test
It is reported that North Korea has conducted another nuclear bomb test.
proving ground; test site
He is looking for a proving ground to test his new theory.
thought experiment
He conducted a thought experiment to solve a problem in physics.
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.
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