Chemical reaction - Revision history

Jmdonev: 1 revision imported

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energy>Ethan.boechler at 21:27, 10 September 2021

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	[[Category:Done 2020-02-29]]		[[Category:Done 2020-02-29]]
			[[Category:Translated to French]]
			[[fr:Réaction chimique]]
	<onlyinclude>A '''chemical reaction''' is a recombination of [[atom]]s that produces products with new chemical identities. Chemical reactions power life, and provide most of the energy used by today's [[high energy society]].</onlyinclude> Humans use an uncountable number of chemical reactions to make modern society possible; for example, to make products and prepare food. Chemical reactions are often accompanied by the release or absorption of [[energy]], or the emission or absorption of [[light]]. Chemical reactions rearrange atoms into new [[molecule]]s, but no new atoms are created or destroyed.		<onlyinclude>A '''chemical reaction''' is a recombination of [[atom]]s that produces products with new chemical identities. Chemical reactions power life, and provide most of the energy used by today's [[high energy society]].</onlyinclude> Humans use an uncountable number of chemical reactions to make modern society possible; for example, to make products and prepare food. Chemical reactions are often accompanied by the release or absorption of [[energy]], or the emission or absorption of [[light]]. Chemical reactions rearrange atoms into new [[molecule]]s, but no new atoms are created or destroyed.

Jmdonev: 1 revision imported

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energy>Jmdonev at 23:06, 10 April 2020

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	<onlyinclude>A '''chemical reaction''' is a recombination of [[atom]]s that produces products with new chemical identities. Chemical reactions power life, and provide most of the energy used by today's [[high energy society]].</onlyinclude> Humans use an uncountable number of chemical reactions to make modern society possible; for example, to make products and prepare food. Chemical reactions are often accompanied by the release or absorption of [[energy]], or the emission or absorption of [[light]]. Chemical reactions rearrange atoms into new [[molecule]]s, but no new atoms are created or destroyed.		<onlyinclude>A '''chemical reaction''' is a recombination of [[atom]]s that produces products with new chemical identities. Chemical reactions power life, and provide most of the energy used by today's [[high energy society]].</onlyinclude> Humans use an uncountable number of chemical reactions to make modern society possible; for example, to make products and prepare food. Chemical reactions are often accompanied by the release or absorption of [[energy]], or the emission or absorption of [[light]]. Chemical reactions rearrange atoms into new [[molecule]]s, but no new atoms are created or destroyed.

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	==Chemical energy==		==Chemical energy==
	:''[[~~fuels~~\|main article]]''		:''[[fuel\|main article]]''
	Chemical reactions involve the [[electric force]], which is the attraction between atoms. Less energy is involved in chemical reactions than in [[nuclear fission\|nuclear reaction]]s, because the latter involve the [[strong force]], or attraction between [[nucleon]]s, [[proton]]s and [[neutron]]s, in the [[nucleus]].		Chemical reactions involve the [[electric force]], which is the attraction between atoms. Less energy is involved in chemical reactions than in [[nuclear fission\|nuclear reaction]]s, because the latter involve the [[strong force]], or attraction between [[nucleon]]s, [[proton]]s and [[neutron]]s, in the [[nucleus]].

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	==Further reading==		==Further reading==
	To learn more about chemical reactions, please check out [http://chemwiki.ucdavis.edu/Analytical_Chemistry/Chemical_Reactions/Chemical_Reactions UC Davis's chem wiki] and [~~http~~://hyperphysics.phy-astr.gsu.edu/hbase/hframe.html hyperphysics].		To learn more about chemical reactions, please check out [http://chemwiki.ucdavis.edu/Analytical_Chemistry/Chemical_Reactions/Chemical_Reactions UC Davis's chem wiki] and [https://hyperphysics.phy-astr.gsu.edu/hbase/hframe.html hyperphysics].
	[[Category:Uploaded]]		[[Category:Uploaded]]

Jmdonev at 20:46, 18 February 2020

2020-02-18T20:46:39Z

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	The [http://phet.colorado.edu/ University of Colorado] has graciously allowed us to use the following PhET simulation. Explore this simulation below to see how all of the different chemical elements recombine to form new molecules.		The [http://phet.colorado.edu/ University of Colorado] has graciously allowed us to use the following PhET simulation. Explore this simulation below to see how all of the different chemical elements recombine to form new molecules.
	<html>		<html>
	<iframe src="~~http~~://phet.colorado.edu/sims/html/balancing-chemical-equations/latest/balancing-chemical-equations_en.html" width="810" height="580">		<iframe src="https://phet.colorado.edu/sims/html/balancing-chemical-equations/latest/balancing-chemical-equations_en.html" width="810" height="580">
	</iframe>		</iframe>
	</html>		</html>

J.williams: 1 revision imported

2015-09-03T18:23:06Z

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Jmdonev at 00:15, 29 August 2015

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	[[Category:Done 2015-08-21]]		[[Category:Done 2015-09-05]]
	<onlyinclude>A '''chemical reaction''' is a recombination of [[atom]]s that produces products with new chemical identities. Chemical reactions power life, and provide most of the energy used by today's [[high energy society]]. Humans use an uncountable number of chemical reactions to make modern society possible; for example, to make products and prepare food. Chemical reactions are often accompanied by the release or absorption of [[energy]], or the emission or absorption of [[light]]. Chemical reactions rearrange atoms into new [[molecule]]s, but no new atoms are created or destroyed.~~</onlyinclude>~~		<onlyinclude>A '''chemical reaction''' is a recombination of [[atom]]s that produces products with new chemical identities. Chemical reactions power life, and provide most of the energy used by today's [[high energy society]].</onlyinclude> Humans use an uncountable number of chemical reactions to make modern society possible; for example, to make products and prepare food. Chemical reactions are often accompanied by the release or absorption of [[energy]], or the emission or absorption of [[light]]. Chemical reactions rearrange atoms into new [[molecule]]s, but no new atoms are created or destroyed.

	==Common reaction types==		==Common reaction types==

J.williams: 1 revision imported

2015-08-26T21:30:54Z

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Jmdonev at 02:08, 19 August 2015

2015-08-19T02:08:24Z

New page

[[Category:Done 2015-08-21]]
<onlyinclude>A '''chemical reaction''' is a recombination of [[atom]]s that produces products with new chemical identities. Chemical reactions power life, and provide most of the energy used by today's [[high energy society]]. Humans use an uncountable number of chemical reactions to make modern society possible; for example, to make products and prepare food. Chemical reactions are often accompanied by the release or absorption of [[energy]], or the emission or absorption of [[light]]. Chemical reactions rearrange atoms into new [[molecule]]s, but no new atoms are created or destroyed.</onlyinclude>

==Common reaction types==
Most chemical reactions are in one of the following four forms:

*A + B —> AB (composition)
*AB —> A + B (decomposition)
*AB + C —> AC + B (single replacement)
*AB + CD —> AD + CB (double replacement)

==Energy from reactions==
Chemical reactions provide a way to get at [[primary energy]] in [[fuel]]s (both primary fuels like [[coal]], [[oil]], and [[natural gas]] and also [[secondary fuel]]s like [[molecular hydrogen]] and [[gasoline]]). When chemicals react, [[chemical bond]]s are broken and then restructured. When chemical bonds break, energy is absorbed (it takes energy to break a chemical bond). When the atoms recombine into new molecules, energy is given off (from the chemical bonds forming). When getting energy from a fuel, more energy is given off from the new molecules forming than went into breaking the bonds in the first place.

This is why [[hydrocarbon]]s have to be brought to a certain [[temperature]] before they'll combine with [[oxygen]] in [[combustion]]. The energy released from one hydrocarbon undergoing combustion will lead to another molecule undergoing the same chemical reaction. This is a [[chemical chain reaction]]. Technology like [[heat engine]]s has been developed to get energy out of chemical reactions in this way. There will always be molecules in a lower energy state coming out of these reactions. The two biggest are [[carbon dioxide]] and water.

[[Fuel cell]]s also get energy from chemical reactions, but of a different sort.

==Chemical energy==
:''[[fuels|main article]]''
Chemical reactions involve the [[electric force]], which is the attraction between atoms. Less energy is involved in chemical reactions than in [[nuclear fission|nuclear reaction]]s, because the latter involve the [[strong force]], or attraction between [[nucleon]]s, [[proton]]s and [[neutron]]s, in the [[nucleus]].

Chemical energy is the energy released by breaking the bonds between atoms in a molecule. Because these bonds are relatively weak compared to the strong force, it is easy to gain the energy (provide a spark to [[gasoline]], and it will [[ignition|ignite]]). In a similar vein, breaking the bonds of the much stronger strong force, produces much more energy, but is more difficult. By comparison, [[uranium]] is a million times more [[energy density|energy dense]] than gasoline, because its energy is released by breaking the nucleus.

==Simulation==
The [http://phet.colorado.edu/ University of Colorado] has graciously allowed us to use the following PhET simulation. Explore this simulation below to see how all of the different chemical elements recombine to form new molecules.
<html>
<iframe src="http://phet.colorado.edu/sims/html/balancing-chemical-equations/latest/balancing-chemical-equations_en.html" width="810" height="580">
</iframe>
</html>

==Further reading==
To learn more about chemical reactions, please check out [http://chemwiki.ucdavis.edu/Analytical_Chemistry/Chemical_Reactions/Chemical_Reactions UC Davis's chem wiki] and [http://hyperphysics.phy-astr.gsu.edu/hbase/hframe.html hyperphysics].
[[Category:Uploaded]]