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.

[Q]: Ostwald ripening is a consequence of this quantity's dependence on particle size. This quantity is plotted against temperature in an Ellingham diagram, and the Margules and van Laar equations relate this quantity to the activity coefficient. Phillips and Williams modified a diagram plotting this quantity over the Faraday constant against the oxidation state, the (*) Frost diagram. The Flory-Huggins interaction parameter appears in a namesake expression giving the "partial molar" value of this quantity, also generally referred to as chemical potential. It is equivalent to the work done under constant pressure and temperature, and this quantity "of formation" is negative for thermodynamically stable compounds. For 10 points, give this thermodynamic quantity, whose change is equal to the change in enthalpy minus the product of temperature and the change in entropy, which is named after an American scientist.
[A]: Science

[Q]: According to one story, this figure founded a city when his efforts in digging up a mushroom revealed a spring. That city was ruled by Electryon and Sthenelus, members of a namesake dynasty he founded. When this ruler was unable to assume the throne of Argos, he traded realms with Megapenthes. This man was sent on a quest by a king of Seriphus named (*) Polydectes during which he stole the tooth and eye of the Graeae. He rescued the daughter of Cassiopea and Cepheus from a sea monster before taking that girl, Andromeda, as his wife. His mother Danae was locked in a tower by King Acrisius to avoid a prophecy, but he was conceived by Zeus in the form a stream of gold. For 10 points, name this hero who used winged sandals and the helmet of invisibility to slay Medusa.
[A]: Social Science

[Q]: One indigenous people of this country established a turquoise trade with a capital at Tollan. An earlier civilization in this country constructed the Temple of the Dancers during the Formative Period. A different archaeological site in this country has buildings that exemplify the slope-and-panel style and contains large buildings connected by the Avenue of the Dead. Yet another ancient city in this modern-day country contains numerous reclining figures called (*) chacmools. One of its largest ancient cities contained the massive Pyramids of the Sun and Moon, and this country is also home to Monte Alban. This country is where one can find archaeological sites like Teotihuacan and Chichen Itza. For 10 points, name this modern-day country once home to Zapotec and Aztec civilizations.
[A]:
Social Science