Stoichiometry records reactant and product multiplicities in a chemical reaction or a chemical reaction network. The change caused by one reaction is its stoichiometric vector; multiplying by the reaction rate gives its contribution to the concentration equations. For two identical reactants the rate-constant convention absorbs any combinatorial factor.

Negative hydrogen ion ( $H^{-}$ )

 0  0

A negative hydrogen ion is a hydrogen nucleus with two bound electrons. Its weakly bound extra electron permits absorption at visible and infrared wavelengths in cool stellar atmospheres.

Molecular nitrogen ( $N_{2}$ )

 0  0

Molecular hydrogen ( $H_{2}$ )

 0  0

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Chemistry by

Donald Trump  29 Created 2022-11-02 Updated 2025-04-18

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This is a section about Chemistry!

Chemistry is a very important subject about which there is a lot to say.

For example, this sentence. And then another one.

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Chemistry by

Barack Obama  11 Created 2022-11-02 Updated 2025-04-18

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This is a section about Chemistry!

Chemistry is a very important subject about which there is a lot to say.

For example, this sentence. And then another one.

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Chemistry by

Ciro Santilli  40 Updated 2025-07-16

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Chemistry is fun. Too hard for precise physics (pre quantum computing, see also quantum chemistry), but not too hard for some maths like social sciences.

And it underpins biology.

Video 1.

100 Greatest Discoveries - Chemistry by the Discovery Channel (2005)

Source. Pretty good within what you can expect from popular science. The discovery selection is solid, and he interviews 3 Nobel Prize laureates, only one about stuff they invented, so you can see their faces. The short non-precise scenes of epoch are also pleasing. Part of 100 Greatest Discoveries by the Discovery Channel (2004-2005).

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Chemistry

Chemical reaction

Stoichiometry

Chemical substance

Chemical element

Oxygen ( $O$ )

Nitrogen ( $N$ )

Carbon ( $C$ )

Helium ( $He$ )

Hydrogen ( $H$ )

Negative hydrogen ion ( $H^{-}$ )

Molecular nitrogen ( $N_{2}$ )

Molecular hydrogen ( $H_{2}$ )

Chemical compound

Vanadium(II) oxide ( $VO$ )

Titanium monoxide ( $TiO$ )

Acetylene ( $C_{2} H_{2}$ )

Hydrogen cyanide ( $HCN$ )

Carbon dioxide ( $CO_{2}$ )

Carbon monoxide ( $CO$ )

Ammonia ( $NH_{3}$ )

Methane ( $CH_{4}$ )

Water ( $H_{2} O$ )

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