TASK DEFINITION: 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.
PROBLEM: This element's only oxidation state is -1, and it is impossible to free from its compounds by chemical means. It is prepared commercially be the same method which Henri Moisson used to isolate it in 1886, and is also found in the mineral cryolite. Its only isotope is the stabe 19 version, and in its gaseous form takes on a pale yellow color. The most electronegative and reactive of the elements, FTP, what is this lightest of the halogens with atomic number 9 and symbol F

SOLUTION: Science

PROBLEM: This artist only completed the preparatory sketches for the epic Opening of the Doors of the Spanish Inquisition. This artist showed a cart stopped next to a gray building emitting white smoke in The Lime Kiln. He painted an unusual still-life of severed limbs called Anatomical Pieces, and he featured horses in his paintings Derby at Epsom and Horse Frightened By Lightning. A horse rearing away from an unseen attacker appears in his The Charging Chasseur. He studied bodies in the morgue of the Hospital Beaujon for his most famous work, which sees a man waving a red handkerchief on the top right and a bloody hatchet implies cannibalism. For 10 points, name this French Romantic painter of The Raft of the Medusa.

SOLUTION: Fine Arts

PROBLEM: When this process is induced by a magnetic field in a paramagnetic system, the critical field for the onset of instability decreases with layer thickness. Two types of this phenomenon are related by the Archimedes number; when that number is very small one of its forms is described by the Peclet number. This phenomenon can be quantified, as long as the product of the Prandtl and Reynolds numbers are greater than one-fifth, by the Churchill-Bernstein equation. A compositional form of this phenomenon generates the earth's magnetic field. Its natural type is governed by the ratio of density difference times little g times length scale cubed to diffusivity times dynamic viscosity, the Rayleigh number. For a boundary, the ratio of this to conduction is given by the Nusselt number. For 10 points, name this mode of heat transfer that relies on the motion of currents in a fluid.

SOLUTION:
Science