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Quaternary is a term used in organic chemistry to classify various types of compounds (e. g. amines and ammonium salts). [ 1 ] Red highlighted central atoms in various groups of chemical compounds.
US Government Manual, official freely downloadable PDFs of annual printed versions. Federal Agency Directory, online database maintained by the Louisiana State University Libraries in partnership with the Federal Depository Library Program of the GPO; A–Z Index of US Departments and Agencies, USA.gov, the US government's official web portal ...
Advanced Placement (AP) United States Government and Politics (often shortened to AP Gov or AP GoPo and sometimes referred to as AP American Government or simply AP Government) is a college-level course and examination offered to high school students through the College Board's Advanced Placement Program.
In chemistry, a quaternary compound is a compound consisting of exactly four chemical elements. In another use of the term in organic chemistry , a quaternary compound is or has a cation consisting of a central positively charged atom with four substituents, especially organic ( alkyl and aryl ) groups, discounting hydrogen atoms.
Most state governments traditionally use the department as the standard highest-level component of the executive branch, in that the secretary of a department is normally considered to be a member of the Governor's cabinet and serves as the main interface between the Governor and all agencies in his or her assigned portfolio.
The United States federal executive departments are the principal units of the executive branch of the federal government of the United States.They are analogous to ministries common in parliamentary or semi-presidential systems but (the United States being a presidential system) they are led by a head of government who is also the head of state.
With four elements, quaternary phases are more complex. The number of isomers of a ternary compound provide a distinction between inorganic and organic chemistry: "In inorganic chemistry one or, at most, only a few compounds composed of any two or three elements were known, whereas in organic chemistry the situation was very different."
The 2014 AP Chemistry exam was the first administration of a redesigned test as a result of a redesigning of the AP Chemistry course. The exam format is now different from the previous years, with 60 multiple choice questions (now with only four answer choices per question), 3 long free response questions, and 4 short free response questions.