In this task you will be given a text passage from a trivia quiz. You should choose the category this question belongs to from these categories: History, Science, Social Science, Fine Arts, Literature. You can only choose one category, so if in doubt, please choose the closest match.

[EX Q]: A paper he wrote about the geometrical representation of a certain kind of property by means of surfaces so excited Maxwell that he made a model illustrating the method. During the early 1880s, this man worked on a modification of the quaternion which he thought could be adapted into a new system of vector analysis, but it had little impact. He developed an "electrical theory of light" which presumed that light is a disturbance propagating through relatively fine-grained media, while his last work was a treatise on Elementary Principles in Statistical Mechanics which he completed a year before his death in 1903. His greatest discovery was popularized by the Dutch scientist who experimentally confirmed it, Hendrik Roozeboom. His most famous work was translated by Le Chatelier and Ostwald, and established a basis for the theory of the thermodynamic properties of heterogenous substances. FTP, name this founder of physical chemistry, an American scientist known for his namesake phase rule.
[EX A]: Science

[EX Q]: Rosenheim and Callow developed a test in which a mixture of this compound and metal acetates are used to detect the presence of sterols. Millon's reagent is a solution of mercury in this substance and a similar substance, which turns red in the presence of phenolic compounds and is useful in detecting tyrosine residues. The commercial production of this compound begins with the combustion of ammonia using a platinum-rhodium catalyst; that process is the Ostwald process. For 10 points, identify this acid which is found with hydrochloric acid in aqua regia, and has chemical formula HNO3.
[EX A]: Science

[EX Q]: A model for its synthesis incorporates the tenets of catalytic cooperativity and rotational catalysis, which were formulated by Paul Boyer. This molecule binds to Walker A and Walker B motifs, and it can be synthesized via the binding change mechanism. During the formation of pyrimidines, it joins with ribose 5-phosphate to form PRPP. It is synthesized in the F0F1 complex, and it is catalyzed by dynein for use in flagella. It is produced under low-oxygen conditions by substrate-level phosphorylation, as in the last three reactions of glycolysis. FTP name this energy-carrying molecule produced by the electron-transport chain.
[EX A]:
Science