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Portal is a 2007 puzzle-platform game developed and published by Valve. It was originally released in a bundle, The Orange Box, for Windows, Xbox 360 and PlayStation 3, and has been ported to other systems, including Mac OS X, Linux, Android (via Nvidia Shield), and Nintendo Switch. Portal consists primarily of a series of puzzles that must be solved by teleporting the player's character and ...

Portal™ is a new single player game from Valve. Set in the mysterious Aperture Science Laboratories, Portal has been called one of the most innovative new games on the horizon and will offer gamers hours of unique gameplay.

Chemists classify chemical reactions in a number of ways: by type of product, by types of reactants, by reaction outcome, and by reaction mechanism. Often a given reaction can be placed in two or even three categories, including gas -forming and precipitation reactions.

Find out about chemical reactions. What are their different types. How to identify each type. Check out a few examples and learn their uses and applications.

Learn about the main types of chemical reactions and their names. See examples and chemical equations for each type of reaction.

Chemical reactions are described with chemical equations, which symbolically present the starting materials, end products, and sometimes intermediate products and reaction conditions. Chemical reactions happen at a characteristic reaction rate at a given temperature and chemical concentration.