Energy & Green Tech
A scientific breakthrough brings mass production of the next generation of cheaper and lighter perovskite solar cells one step closer thanks to researchers at the University of Surrey's Advanced Technology Institute (ATI). ...
Sep 20, 2023
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Energy & Green Tech
Storing renewable energy as hydrogen could soon become much easier thanks to a new catalyst based on single atoms of platinum. The new catalyst, designed by researchers at City University Hong Kong (CityU) and tested by colleagues ...
Sep 20, 2023
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32
Energy & Green Tech
A research team led by Prof. Yan Lifeng from the University of Science and Technology of China (USTC) of the Chinese Academy of Sciences (CAS) has designed a water-based nanomicellar electrolyte by using methylurea (Mu). ...
Sep 18, 2023
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113
Energy & Green Tech
A sustainable revolution is growing across the sun-drenched slopes of Australia's agricultural regions. Our future farmlands have the potential to do more than produce food. They could also power the bioeconomy, support our ...
Sep 15, 2023
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Energy & Green Tech
Danish shipping giant Maersk on Thursday launched the world's first container ship running on bio-methanol, a key step in its effort to lower its huge carbon footprint.
Sep 14, 2023
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Energy & Green Tech
Researchers from the Qingdao Institute of Bioenergy and Bioprocess Technology (QIBEBT) of the Chinese Academy of Sciences (CAS) have tweaked the material of ternary organic solar cells (TOSCs) and achieved efficiencies in ...
Sep 4, 2023
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79
Energy & Green Tech
By 2050 North Africa could become a leading exporter of green hydrogen with Europe its main market, according to a recent report projecting the future of an industry still in its infancy.
Aug 17, 2023
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Energy & Green Tech
Engineers in Melbourne are vying for pole position in the global race to make a cheap rechargeable battery for storing solar energy that does not rely on scarce natural resources.
Jul 27, 2023
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Energy & Green Tech
Two-thirds of the Earth's surface is awash with the stuff, but water—specifically, the clean and drinkable kind—is inaccessible to billions of people.
Jun 26, 2023
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66
Energy & Green Tech
The race to make the widespread use of intermittent renewable energy a reality has taken a step forward with new research by experts from the University of Adelaide who are improving the efficiency of iridium-based catalysts.
Jun 23, 2023
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A molecule is defined as a sufficiently stable, electrically neutral group of at least two atoms in a definite arrangement held together by very strong (covalent) chemical bonds. Molecules are distinguished from polyatomic ions in this strict sense. In organic chemistry and biochemistry, the term molecule is used less strictly and also is applied to charged organic molecules and biomolecules.
In the kinetic theory of gases the term molecule is often used for any gaseous particle regardless of its composition. According to this definition noble gas atoms are considered molecules despite the fact that they are composed of a single non-bonded atom.
A molecule may consist of atoms of a single chemical element, as with oxygen (O2), or of different elements, as with water (H2O). Atoms and complexes connected by non-covalent bonds such as hydrogen bonds or ionic bonds are generally not considered single molecules.
No typical molecule can be defined for ionic crystals (salts) and covalent crystals (network solids), although these are often composed of repeating unit cells that extend either in a plane (such as in graphene) or three-dimensionally (such as in diamond or sodium chloride). The theme of repeated unit-cellular-structure also holds for most condensed phases with metallic bonding. In glasses (solids that exist in a vitreous disordered state), atoms may also be held together by chemical bonds without any definable molecule, but also without any of the regularity of repeating units that characterises crystals.
This text uses material from Wikipedia, licensed under CC BY-SA
