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  2. Chemical oxygen generator - Wikipedia

    en.wikipedia.org/wiki/Chemical_oxygen_generator

    The chemical reaction is exothermic and the exterior temperature of the generator will reach 260 °C (500 °F). It will produce oxygen for 12 to 22 minutes. [2] [3] The two-mask generator is approximately 63 mm (2.5 in) in diameter and 223 mm (8.8 in) long. The three-mask generator is approximately 70 mm (2.8 in) in diameter and 250 mm (9.8 in ...

  3. Glossary of chemistry terms - Wikipedia

    en.wikipedia.org/wiki/Glossary_of_chemistry_terms

    Also acid ionization constant or acidity constant. A quantitative measure of the strength of an acid in solution expressed as an equilibrium constant for a chemical dissociation reaction in the context of acid-base reactions. It is often given as its base-10 cologarithm, p K a. acid–base extraction A chemical reaction in which chemical species are separated from other acids and bases. acid ...

  4. Chemical substance - Wikipedia

    en.wikipedia.org/wiki/Chemical_substance

    [1] [2] Chemical substances may take the form of a single element or chemical compounds. If two or more chemical substances can be combined without reacting, they may form a chemical mixture. [3] If a mixture is separated to isolate one chemical substance to a desired degree, the resulting substance is said to be chemically pure. [4]

  5. Crossword - Wikipedia

    en.wikipedia.org/wiki/Crossword

    An American-style 15×15 crossword grid layout. A crossword (or crossword puzzle) is a word game consisting of a grid of black and white squares, into which solvers enter words or phrases ("entries") crossing each other horizontally ("across") and vertically ("down") according to a set of clues. Each white square is typically filled with one ...

  6. List of fictional elements, materials, isotopes and subatomic ...

    en.wikipedia.org/wiki/List_of_fictional_elements...

    It is thus used in multiple robots, being the key component in Mega Man's armor, the Metal Blades of Metal Man, Cut Man's Rolling Cutter, and Hard Man's body. Chelonium Discworld: According to the wizards at the Unseen University, the species Chelys galactica, including Great A'Tuin, are largely made of this element. Its properties are ...

  7. Chemical compound - Wikipedia

    en.wikipedia.org/wiki/Chemical_compound

    [16] [17] [18] A molecule may be homonuclear, that is, it consists of atoms of one chemical element, as with two atoms in the oxygen molecule (O 2); or it may be heteronuclear, a chemical compound composed of more than one element, as with water (two hydrogen atoms and one oxygen atom; H 2 O). A molecule is the smallest unit of a substance that ...

  8. Glossary of chemical formulae - Wikipedia

    en.wikipedia.org/wiki/Glossary_of_chemical_formulae

    13537-16-1 F 2 O 2: perfluoroperoxide: 7783-44-0 F 2 O 2 S: sulfuryl fluoride: 2699-79-8 F 2 O 2 W: tungsten difluoride dioxide: 14118-73-1 F 2 O 5 S 3: peroxydisulfuryl difluoride: F 2 P: phosphorus difluoride: 13873-52-4 F 2 Pb: lead difluoride: 7783-46-2 F 2 Pt: platinum difluoride: 18820-56-9 F 2 Pu: plutonium difluoride: 20882-15-9 F 2 S ...

  9. Category:Chemical substances - Wikipedia

    en.wikipedia.org/wiki/Category:Chemical_substances

    A chemical substance is any material substance used in or obtained by a process in chemistry, such as a chemical element or chemical compound. Subcategories This category has the following 30 subcategories, out of 30 total.