In which subject would you find questions about chemical reactions on LifeX?

The correct choice is Chemistry because this subject specifically focuses on the study of matter and the changes it undergoes during chemical reactions. Chemical reactions involve the transformation of reactants into products, which is a fundamental topic in chemistry.

In a chemistry course, you explore various types of reactions, their mechanisms, energy changes, and the laws that govern these processes. This includes understanding how substances combine, rearrange, or break apart to form new substances, and analyzing the conditions under which these reactions occur.

Understanding chemical reactions is critical in chemistry because it forms the basis of many real-world applications, such as in pharmaceuticals, environmental science, and industrial processes. Therefore, a question on this topic would be most appropriately found in a chemistry context, which distinguishes it from subjects like biology, mathematics, or physics, where chemical reactions might be discussed but are not the primary focus.