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.

The attenuated total reflection type of this can be used on compounds with a low surface area, while the diffuse reflectance type can be used to study samples that are not sufficiently transparent. The multiplex advantage explains the use of the Fourier Transform type of this. Diatomic bonds are generally not found in the fingerprint region, and the stretching seen using this technique generally occurs at higher frequencies than the bending. Most types of this use some sort of absorption, because each bond in the molecule will absorb only its characteristic frequency. For 10 points, name this type of analytical technique, which categorizes compounds based on the frequency of the vibration of its bonds when exposed to radiation of waves longer than those of visible light.
Science

A late work from this movement done entirely in shades of brown is Mechano-Dancer, by Vilmos Huszar. A house from this movement, designed by the maker of the Red and Black Chair, was commission by Mrs. Schroder-Schrader. The best-known member of this group broke away over an argument about the use of diagonal lines with Theo von Doesburg. Also known as neoplasticism, for 10 points, Piet Mondrian was key figure in what Dutch artistic movement
Fine Arts

In the presence of this compound, Nessler's reagent turns yellow. A solution of sodium in this compound is used in the Birch reduction. Its liquid form notably has a specific heat capacity higher than that of water. The reaction used to synthesize it most commonly employs an iron catalyst. It is oxidated in the Ostwald process for producing nitric acid, and this compound itself is produced by the Haber-Bosch process. For 10 points, name this trigonal pyramidal compound with formula NH3.

Science

