NounSingular molecule Plural molecules molecule (plural molecules)
Synonyms
MeronymsRelated termsFrom Wiktionary under the GNU Free Documentation License. A molecule is defined as an 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. Molecules as components of matter are common in organic substances (and therefore biochemistry). They also make up most of the oceans and atmosphere. A large number of familiar solid substances, however, including most of the minerals that make up the crust, mantle, and core of the Earth itself, contain many chemical bonds, but are not made of identifiable 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. From Wikipedia under the
GNU Free Documentation License How can you tell if a molecule exhibits delocalized bonds? Q. I guess. what is a delocalized bond? and how do you know if a molecule has them? Asked by wicky034 - Wed Oct 24 23:25:35 2007 - - 1 Answers - 0 Comments A. A delocalized bond is where a double bond is spread out over the molecule. For example, when you draw benzene on paper, you might put down 3 double bonds and 3 single bonds. Looking at this, you would think that there are 2 types of bonding in benzene. Experimental data shows that there is only one type of bonding in benzene. The distance between carbon atoms in benzene is between single carbon carbon bonds and double carbon carbon bonds. It's as if the double bond is stretched and the single bond is shortened until there is no difference between them. Anywhere a double bond is adjacent to an atom with a lone pair of electrons (or a double or triple bond), delocalization of the bond may occur. For example: carboxylic acids, esters,… [cont.] Answered by Lance - Sun Oct 28 15:12:10 2007 How does a molecule have polar bonds and still be nonpolar? Q. Explain how a molecule may contain polar bonds but would still be a nonpolar molecule. List all possible shapes that can give this scenario. Asked by Hula - Mon Jun 29 18:53:08 2009 - - 2 Answers - 0 Comments A. A molecule may contain polar bonds, but still be nonpolar overall if the dipoles cancel each other out. This occurs in molecules with the following shapes: linear triatomic - like O=C=O triangular - like SO3 tetrahedral - like CCl4 trigonal bipyramidal - like PCl5 octahedral - like SF6 Answered by Chem Man - Mon Jun 29 19:00:35 2009 What does a decaffeinated molecule look like? What is the mechanism of this reaction too?
Q. I can see what a caffeine molecule looks like now I just need to see what a decaf molecule looks like and hopefully write up a mechanism for both. Asked by Nielsen - Sun May 3 23:57:01 2009 - - 1 Answers - 0 Comments A. huh? Decaffeinated just means that the caffeine has been removed from the solution or mixture. decaffeine is not a molecule. Caffeine can be removed from coffee or tea by extracting with dichloromethane Answered by Karina Gornall - Mon May 4 00:06:29 2009 From Yahoo Answer Search: "molecule"  playstationlifestyle.net Tue, 15 Jun 2010 03:07:49 GMT+00:00 Talks LittleBigPlanet 2 PlayStation LifeStyle (blog) Media Molecule recently announced a sequel: LittleBigPlanet 2. The game is due out later this year it is looking to capitalize on what they created in the ... Media Molecule 'Optimistic that someone will create a new genre' in LBP2 PS3Center.net  physics.aps.org Fri, 11 Jun 2010 15:02:13 GMT+00:00 at a time Physics With so many atoms and molecules to keep track of, it's not surprising that the process of dissolving one substance in another is difficult to describe. ...  hhmi.org Thu, 03 Jun 2010 19:25:58 GMT+00:00 Howard Hughes Medical Institute Bertozzi invented the world's first bioorthogonal chemical reaction, a technique that adds a marker molecule to sugars, proteins, and other cellular ... From Google News Search: "molecule"  andypaikoglass.com 434px x 394px | 110.90kB [source page] Next 75 of 79 This is what I think memories look like From Yahoo Image Search: "molecule"  nanowerk.com unknown ue, 29 Jun 2010 06:26:59 GM The team reports it has learned how to decode the electrical signals generated by a nanopore a "gate" less than 2 nanometers wide in an artificial cell membrane ("Theory for polymer analysis using nanopore-based single-. molecule. mass ...  sciencecentric.com unknown Fri, 28 May 2010 14:18:00 GM Many disease-causing microbes carry pumps that expel antibiotics, making the bugs hard to kill with standard drugs.  develop-online.net unknown ue, 15 Jun 2010 20:35:00 GM Developer's Alex Evans demos the next stage in Sony's 'play, create, share' ethos. From Google Blog Search: "molecule" |
