The scientist conducted experiments to study the effects of the new chemical.
A. A substance made by mixing two or more elements that react chemically.
B. A study of celestial objects and phenomena beyond the earth’s atmosphere.
C. A type of biological organism found in aquatic environments.
D. A method used to analyze data in statistics.
Answer: (A)
Solution: Based on the context of the sentence, the word “chemical” is used in the context of conducting experiments. It indicates that the scientist is studying the effects of a new substance, which fits the definition of “chemical” as “a substance made by mixing two or more elements that react chemically.”