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Chemistry is the scientific study of the properties and behavior of matter. It is a physical science within the natural sciences that studies the chemical elements that make up matter and compounds made of atoms, molecules and ions: their composition, structure, properties, behavior and the changes they undergo during reactions with other ...
Web portal. A web portal is a specially designed website that brings information from diverse sources, like emails, online forums and search engines, together in a uniform way. Usually, each information source gets its dedicated area on the page for displaying information (a portlet ); often, the user can configure which ones to display.
Chemistry/Intro. Chemistry is the scientific study of the properties and behavior of matter. It is a physical science within the natural sciences that studies the chemical elements that make up matter and compounds made of atoms, molecules and ions: their composition, structure, properties, behavior and the changes they undergo during reactions ...
The above definitions are no longer the most commonly used in either system of units. Current use. Many different definitions of standard reference conditions are currently being used by organizations all over the world. The table below lists a few of them, but there are more. Some of these organizations used other standards in the past.
Advanced Placement ( AP) [4] is a program in the United States and Canada created by the College Board. AP offers undergraduate university-level curricula and examinations to high school students. Colleges and universities in the US and elsewhere may grant placement and course credit to students who obtain qualifying scores on the examinations.
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P is the pressure ( SI unit: pascal) V is the volume ( SI unit: cubic metre) n is the number of moles of gas. R is the ideal gas constant ( SI: 8.3145 J / ( mol K )) T is the thermodynamic temperature ( SI unit: kelvin ). An equivalent formulation of this law is: where. N is the number of molecules.
Logo used since July 2023. X, commonly referred to by its former name Twitter, is a social media website based in the United States. With over 500 million users, it is one of the world's largest social networks and the fifth-most visited website in the world. Users can share text messages, images, and videos through posts (originally called ...
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