Which of these disciplines involves understanding the composition and reactions of substances?

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The discipline that involves understanding the composition and reactions of substances is chemistry. Chemistry is the field of science that focuses on the properties, composition, and behavior of matter. It seeks to understand how substances interact with each other, how they change, and the energy transformations that occur during these processes. This includes not only the study of individual elements and compounds but also the analysis of mixtures, reactions, and the principles that govern these transformations.

For example, in chemistry, one learns about acids and bases, ionic and covalent bonding, and how chemical reactions proceed, including concepts like the conservation of mass and energy. These fundamental principles are central to both theoretical studies and practical applications in various fields, including medicine, engineering, and environmental science.

Other disciplines such as biology focus on living organisms and their interactions, geography studies the Earth's landscapes and environments, while astronomy examines celestial bodies and the universe. Although these fields can intersect with chemistry, they do not primarily focus on the composition and reactions of substances.