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]: The Schlenk equilibrium, which can be affected by the presence of dioxane, describes the stability of these compounds, whose synthesis can be improved by the addition of mercuric chloride amalgamates. They react with nitriles to form intermediate imine anions, and dry carbon dioxide can be bubbled through them to create carboxylic acids, which themselves do not form an addition product with these. In what is sometimes called their namesake's reaction, they act as strong nucleophiles to form tertiary or secondary alcohols from ketones or aldehydes. For 10 points, name these compounds formed by reacting an alkyl halide with magnesium, named for a French guy.
[A]: Science


[Q]: In plasmas, the ambipolar version of this phenomenon is inversely proportional to the collision frequency, while the classical form is directly proportional, and is a random-walk process. A semi-empirical formula can be used to describe the Bohn version, while classical cases are governed by Fick's laws and Graham's law. FTP, what is this process in which gases mix due to the random motions of their molecules
[A]: Science


[Q]: This President introduced the Comprehensive Health Insurance Act in his final year of office and declared ""now I am a Keynesian"" after eliminating the gold standard. This man signed the first Clean Air Act and created the Environmental Protection Agency. This President was the first president to visit the People's Republic of China. This President came to power by defeating Democrat Hubert Humphrey in the election of 1968. For 10 points, name this Republican President who resigned in 1974 in the wake of the Watergate scandal.
[A]:
History