Molecule: Difference between revisions
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<onlyinclude>A '''molecule''' is a specific collection of [[atom]]s.</onlyinclude> Sometimes the atoms are the same, like in [[molecular hydrogen]] (H<sub>2</sub>) or [[oxygen]] (O<sub>2</sub>). Often more than one type of atom comes together to make a molecule, like in [[carbon dioxide]](CO<sub>2</sub>) or [[water]] (H<sub>2</sub>O). Molecules have a specific size and chemical composition. | <onlyinclude>A '''molecule''' is a specific collection of [[atom]]s.</onlyinclude> Sometimes the atoms are the same, like in [[molecular hydrogen]] (H<sub>2</sub>) or [[oxygen]] (O<sub>2</sub>). Often more than one type of atom comes together to make a molecule, like in [[carbon dioxide]](CO<sub>2</sub>) or [[water]] (H<sub>2</sub>O). Molecules have a specific size and [[chemical]] composition. | ||
If a substance has a particular chemical composition, but no specific size, it's not a molecule. This includes table salt, a sodium iodide ionic solid, no definite number of sodium or iodide, just a specific ratio. Also, rocks and minerals have a chemical composition that tends to be close to SiO<sub>2</sub>, but not quite consistently enough to be called molecules.<ref>Online: http://chemwiki.ucdavis.edu/?title=Under_Construction/Schaller/Part_I:__Structure_in_Organic,_Biological_%26_Inorganic_Chemistry/IM._Introduction_to_Molecules/IM1._Why_molecules_matter accessed December 18th 2014.</ref> | If a substance has a particular chemical composition, but no specific size, it's not a molecule. This includes table salt, a sodium iodide ionic [[solid]], no definite number of sodium or iodide, just a specific ratio. Also, rocks and minerals have a chemical composition that tends to be close to SiO<sub>2</sub>, but not quite consistently enough to be called molecules.<ref>Online: http://chemwiki.ucdavis.edu/?title=Under_Construction/Schaller/Part_I:__Structure_in_Organic,_Biological_%26_Inorganic_Chemistry/IM._Introduction_to_Molecules/IM1._Why_molecules_matter accessed December 18th 2014.</ref> | ||
[[Chemical reaction]]s make new molecules by recombining atoms in different ways. These reactions release energy from the [[chemical bond]]s which keep the atoms in molecules together. | [[Chemical reaction]]s make new molecules by recombining atoms in different ways. These reactions release [[energy]] from the [[chemical bond]]s which keep the atoms in molecules together. | ||
For an in depth discussion of molecules, please see [http://chemwiki.ucdavis.edu/?title=Under_Construction/Schaller/Part_I:__Structure_in_Organic,_Biological_%26_Inorganic_Chemistry/IM._Introduction_to_Molecules/IM1._Why_molecules_matter UC Davis's chem wiki]. | For an in depth discussion of molecules, please see [http://chemwiki.ucdavis.edu/?title=Under_Construction/Schaller/Part_I:__Structure_in_Organic,_Biological_%26_Inorganic_Chemistry/IM._Introduction_to_Molecules/IM1._Why_molecules_matter UC Davis's chem wiki]. | ||
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Revision as of 19:23, 17 September 2015
A molecule is a specific collection of atoms. Sometimes the atoms are the same, like in molecular hydrogen (H2) or oxygen (O2). Often more than one type of atom comes together to make a molecule, like in carbon dioxide(CO2) or water (H2O). Molecules have a specific size and chemical composition.
If a substance has a particular chemical composition, but no specific size, it's not a molecule. This includes table salt, a sodium iodide ionic solid, no definite number of sodium or iodide, just a specific ratio. Also, rocks and minerals have a chemical composition that tends to be close to SiO2, but not quite consistently enough to be called molecules.[1]
Chemical reactions make new molecules by recombining atoms in different ways. These reactions release energy from the chemical bonds which keep the atoms in molecules together.
For an in depth discussion of molecules, please see UC Davis's chem wiki.