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Topic: Polar molecules

Related Topics

Nonpolar

Dipole moment

Lipophilic

Molecule

Hydrogen bond

Dipole

Water

Lipid

Poly vinyl pyrrolidone

Molecular formula

Solvent

Water

Solution

Carboxy group

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	Molecule - Wikipedia, the free encyclopedia (Site not responding. Last check: 2007-11-07)
		A molecule is the smallest particle of a pure chemical substance that still retains its chemical composition and properties.
		Molecular chemistry is concerned with the laws governing the interaction between molecules that results in the formation and breakage of chemical bonds, while molecular physics is concerned with the laws governing their structure and properties.
		Although the concept of molecule was first introduced in 1811 by Avogadro, the existence of molecules was still an open debate in the chemistry community until the work of Perrin (1911).
	en.wikipedia.org /wiki/Molecule (810 words)

	Molecule (Site not responding. Last check: 2007-11-07)
		Abstractly, a single atom may be considered a molecule, as it is when referred to collectively with molecules of multiple atoms, but in practice the use of the word molecule is usually confined to chemical compounds, of multiple atoms.
		A property of molecules is the integer ratio of the elements that constitute the compound, the empirical formula.
		Molecules have fixed equilibrium geometries—bond lengths and angles—that are dictated by the laws of quantum mechanics.
	hallencyclopedia.com /Molecule (823 words)

	Polar molecules (Site not responding. Last check: 2007-11-07)
		Marvelous Molecules Includes a brief introduction about what molecules are, along with some pictures of certain molecules including aspirin and carbon dioxide.
		Visualizing Molecules Provides an introduction to what molecules are by focusing on examples that include binary compounds and molecular geometry.
		Molecules with Silly or Unusual Names A collection of funny sounding and strangely named molecules, complete with a description of their chemical properties.
	www.serebella.com /encyclopedia/article-Polar_molecules.html (373 words)

	London Forces (Site not responding. Last check: 2007-11-07)
		We know that polar molecules are attracted to each other by dipole-dipole attractions between the partial negative charge of one polar molecule and the partial positive charge on another polar molecule.
		Molecules that undergo this instantaneous increase in their dipole are then able to induce an increase in the dipoles of other molecules.
		The increased attractions between polar molecules that come from the higher charges that arise due to instantaneous increases in dipoles and induced increases in dipoles are London forces.
	www.mpcfaculty.net /mark_bishop/London_polar_molecules.htm (441 words)

	Molecule - Encyclopedia.WorldSearch (Site not responding. Last check: 2007-11-07)
		A molecule consists of two or more atoms joined by shared pairs of electrons in a chemical bond.
		A substance that consists of molecules is a molecular substance or molecular compound.
		Most molecules are much too small to be seen with the naked eye.
	encyclopedia.worldsearch.com /molecule.htm (384 words)

	Hydrophile - Wikipedia, the free encyclopedia
		This is thermodynamically favorable, and makes these molecules soluble not only in water, but also in other polar solvents.
		A hydrophilic molecule, or portion of a molecule is one that is typically charge polarized and capable of hydrogen bonding, enabling it to dissolve more readily in water than in oil or other hydrophobic solvents.
		Hydrophilic and hydrophobic molecules are also known as polar molecules and nonpolar molecules, respectively.
	en.wikipedia.org /wiki/Hydrophilic (119 words)

	Make Your Own Lava Lamp!
		O is the formula of the water molecule, the smallest building block of water.
		Molecules are made of even smaller building blocks called atoms.
		Because a positive charge is attracted to a negative charge, the positive end of one polar molecule will stick to the negative end of another polar molecule.
	www.factmonster.com /spot/lavalamp.html (389 words)

	Chapter 9, Section 3 (Site not responding. Last check: 2007-11-07)
		The shape of a molecule and the polarity of its bonds together determine the charge distribution in the molecule.
		For example, the HF molecule is polar because of the electronegativity difference between H and F: There is a concentration of negative charge on the more electronegative F atom, leaving the less electronegative H atom as the positive end.
		The negative end of a polar molecule is attracted to a positive ion, and the positive end is attracted to a negative ion.
	cwx.prenhall.com /bookbind/pubbooks/blb/chapter9/medialib/blb0903.html (1451 words)

	Atoms, Molecules and Bonds
		Molecules of this type interact with each other such that positive regions in one molecule are attracted to negative regions in adjacent molecules.
		One special type of interaction between polar molecules occurs in many organic (and hence biological) molecules where the weak attraction of the partial charge on a hydrogen atom in a covalent bond for the partial negative charge on an atom in another molecule is termed a hydrogen bond.
		It is much weaker than a covalent bond, but in large molecules with many hydrogen bond interactions, the sum of the interactions can be an important determinant in retaining the shape and structure of a molecule.
	www.unisanet.unisa.edu.au /08365/h&patoms.htm (1198 words)

	molecules.dcr
		Even in a non-polar molecule, however, the valence electrons are moving around and there will occasionally be instances when more are on one side of the molecule than on the other.
		However, non-polar molecules show similar behavior, indicating that there are some types of intermolecular interactions that cannot be attributed to simple electrical attractions.
		Electrical forces operate when the molecules are several molecular diameters apart, and become stronger as the molecules or ions approach each other.
	www.umr.edu /~gbert/INTERACT/intermolecular.HTM (904 words)

	CHEMystery: Atomic Structure and Bonding: Molecular Shape and Polarity (Site not responding. Last check: 2007-11-07)
		In the HCl molecule, which is polar, the H and the Cl differ in electronegativity.
		For molecules that contain more than two atoms, the combined effects of all the polar bonds must be considered.
		A linear molecule, like CO has electronegativity differences between the C and the O. Electrons tend to stay longer with the O, but the molecule is not polar.
	library.thinkquest.org /3659/structures/shapepolarity.html (305 words)

	Astral Voyage - Astral Projection - The Polar Molecule Movement Theory by Mario Fernandez
		The magnet-like molecules are the so-called "polar" molecules, while the others are called "non-polar" molecules.
		The microwaves are nothing but rapid electromagnetic pulses that change the orientation of the tiny magnet-like polar molecules, many times per second.
		The more polar a molecule is, the more heat it will pick up in the microwave oven.
	www.astralvoyage.com /projection/polar.html (404 words)

	Cold Polar Molecules and Shaped Collisions (Site not responding. Last check: 2007-11-07)
		Molecules possess a number of features that could greatly expand the possibilities for study of new interactions, collective quantum effects, collisional processes, fundamental tests and chemical processes.
		This is due to 1) the strong interactions between the dipole moments of polar molecules, 2) the rotational and vibrational internal structure of all molecules, and 3) the easily orientable internal electric field of many polar molecules.
		Three approaches towards trapping of polar molecules, the key first step toward studying ultracold polar molecules at high density, have already succeeded: direct cooling of molecules via a buffer gas, mechanical slowing of a pulsed molecular beam with electric fields and photoassociation of alkali atoms.
	www.physics.uconn.edu /Seminars/2005Spring/20050401pcl.html (311 words)

	Molecular Polarity (Site not responding. Last check: 2007-11-07)
		Polar molecules are molecules that have a concentration of negative charge on one end of the molecule and a concentration of positive charge on the other end.
		The intermolecular forces between molecules tend to pull the surface molecules toward the center of the liquid since the surface molecules of the liquid have only molecules BELOW them pulling downward toward the center of the liquid sample whereas the molecules below the surface are pulled in all directions.
		This pulling downward of the surface molecules toward the center of the liquid sample causes the slight distortion of the surface known as surface tension.
	members.aol.com /profchm/mol_pola.html (481 words)

	Geom03 (Site not responding. Last check: 2007-11-07)
		The molecule can be oriented such that one end has a net negative charge and the other a net positive charge, i.e.
		Although a polar bond is a prerequisite for a molecule to have a dipole, not all molecules with polar bonds exhibit dipoles
		For ABn molecules, where the central atom A is surrounded by identical atoms for B, there a certain molecular geometries which result in no effective dipole, regardless of how polar the individual bonds may be.
	wine1.sb.fsu.edu /chm1045/notes/Geometry/Polarity/Geom03.htm (361 words)

	Chapter 9 - Polarity of Molecules
		We can measure the dipole moment of molecule by applying an electric field to a sample and measuring the attraction between the negatively charged side of the molecule and a positively charged plate, and vice versa (see figure 9.8 in your text).
		However, in molecules with more than two atoms the bond dipoles add like vectors and if the shape of the molecule is correct these vectors can add to zero.
		All of the high symmetry molecular shapes (linear, trigonal planar, tetrahedral, trigonal bipyramidal, octahedral) yield non-polar molecules as long as all of the outer atoms are identical.
	www.chemistry.ohio-state.edu /~woodward/ch121/ch9_polar.htm (694 words)

	Guiding Molecules
		Molecules, on the other hand, have a more complex set of energy levels (associated with rotation and vibration) which are incompatible with laser trapping, so molecular physicists guide molecules with electric and magnetic fields instead.
		So a molecule's rotational state and the strength of the external field determine whether the molecule is described as low or high field seeking.
		The molecules are attracted to the stronger field at the wire, and this small centripetal force holds them in orbit.
	focus.aps.org /story/v6/st13 (467 words)

	Chemical Sciences: Unequal Sharing of Electrons Produces Polar Bonds
		In the water molecule, the electrons are closer to the oxygen; in the HF molecule, the electrons are closer to the fluorine.
		Polar bonds in molecules have an effect on the aggregation of molecules, because the negative end of a polar molecule attracts the positive end of the molecule.
		Polar solvents tend to dissolve polar molecules more easily than nonpolar molecules, and nonpolar solvents thend to dissolve nonpolar molecules more easily than polar molecules.
	www.psigate.ac.uk /newsite/reference/plambeck/chem1/p01244.htm (418 words)

	Polar and Non-Polar Molecules - Succeed in Physical Science (Site not responding. Last check: 2007-11-07)
		Whether molecules are polar or non-polar determines if they will mix to form a solution or that they don't mix well together.
		Water is a polar molecule because of the way the atoms bind in the molecule such that there are excess electrons on the Oxygen side and a lack or excess of positive charges on the Hydrogen side of the molecule.
		The geometry of atoms in polar molecules is such that one end of the molecule has a positive electrical charge and the other side has a negative charge.
	www.school-for-champions.com /science/chempolar.htm (737 words)

	ITAMP Workshop: Ultracold Polar Molecules: Formation and Collisions
		The alkali hydride molecules have significant dipole moments in their electronic ground states, and thus it is interesting to explore the creation of these molecules through stimulated radiative association.
		Several approaches towards trapping of polar molecules, the key first step toward studying ultracold polar molecules at high density, have already succeeded: direct cooling of molecules via a buffer gas, mechanical slowing of a pulsed molecular beam with electric fields and photoassociation of alkali atoms.
		The Zeeman transitions in collisions of triplet-sigma molecules with He atoms are induced by direct couplings due to the anisotropy of the electrostatic atom - molecule interaction and the spin-spin interaction in the molecule.
	itamp.harvard.edu /polar/polar.html (4280 words)

	Reader Feedback - Succeed in Physical Science (Site not responding. Last check: 2007-11-07)
		I have discovered in my research that detergent lowers the surface tension of water because one end of the molecule is polar and the other end nonpolar.
		You say that water is a polar molecule due to the way the moleclues bind.
		Polar molecules have their properties because of the geometry of the molecule.
	www.school-for-champions.com /science/feedback.cfm?topic=Polar%20Molecules (1263 words)

	[No title]
		Polar molecules aligned by charge need not all be of the same compound.
		When another polar molecule such as ammonia (shown in Figure 7.13) is added to water, it dissolves because of the interaction between the two types of molecules.
		Frequently, when a very polar molecule such as hydrogen chloride dissolves in water, there is sufficient interaction between the two molecules to cause one of them to break up into ions.
	genchem.chem.wisc.edu /sstutorial/Text7/Tx75/tx75.html (835 words)

	Water (Site not responding. Last check: 2007-11-07)
		Water is a powerful dissolver of polar ions and molecules (polar solvent), and a similarly powerful excluder of nonpolar molecules.
		Particularly, water molecules form a hydrogen bonded layer, called a hydration shell, that surrounds hydrophilic substances/A. This shell adheres so powerfully that it is actually more energetically favorable for many polar substances to exist as individual molecules surrounded by hydration shells than to remain within a homogeneous solid material.
		However, because those water molecules of its hydration shell do not readily hydrogen bond to the hydrophobic molecule, the presence of a hydration shell is energetically unfavorable.
	www.mansfield.ohio-state.edu /~sabedon/biol1015.htm (2123 words)

	Intermolecular Forces (Site not responding. Last check: 2007-11-07)
		Polar molecules attract one another when the partial positive charge on one molecule is near the partial negative charge on the other molecule
		The polar molecules must be in close proximity for the dipole-dipole forces to be significant
		The greater the polarizability of a molecule the easier it is to induce a momentary dipole and the stronger the dispersion forces
	wine1.sb.fsu.edu /chm1045/notes/Forces/intermol/Forces02.htm (935 words)

	[No title]
		Not all molecules with polar bonds are polar molecules.
		Both the shape of the molecule and the polarity of the bonds are necessary to determine if a molecule is polar or non-polar.
		In all symmetrical molecules, the sum of the bond dipoles is zero and the molecule is non-polar.
	www.angelfire.com /sc3/chemnotes/4.4.doc (1186 words)

	Chem - Topic 4 - Bonding
		Polar molecules...dipole-dipole forces arise from polar bonds and asymmetry in molecules.
		Non-polar molecules are generally soluble in non-polar solvents, and polar in polar.
		Organic molecules with a polar head : Short chain molecules are solubility in polar solvents, long chains can eventually outweigh the polar 'head' and will dissolve in non-polar solvents.
	homepage.mac.com /stray/ib/chem/SSC/topic4.html (858 words)

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