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Topic: Nonpolar molecule

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	Molecule - Wikipedia, the free encyclopedia
		In general, a molecule is the smallest particle of a pure chemical substance that still retains its composition and chemical properties.
		The term unstable molecule is used for very reactive species, i.e., short-lived assemblies (resonances) of electrons and nuclei, such as radicals, molecular ions, Rydberg molecules, transition states, Van der Waals complexes, or systems of colliding atoms as in Bose-Einstein condensates.
		The chemical formula and the structure of a molecule are the two important factors that determine its properties, particularly its reactivity.
	en.wikipedia.org /wiki/Molecule (882 words)

	Chemistry : Chapter 9 : Identifying Intermolecular Forces (Site not responding. Last check: 2007-10-09)
		Therefore polar molecules dissolve in polar solvents and nonpolar molecules dissolve in nonpolar solvents.
		is a polar molecule with a bent geometry.
		is a nonpolar molecule with a linear geometry and a nonpolar bond between the oxygen atoms.
	www.wwnorton.com /chemistry/concepts/chapter9/ch9_1.htm (2326 words)

	CHEM111 - Polar vs Nonpolar (Site not responding. Last check: 2007-10-09)
		Polar molecule = a molecule in which the polar bonds are disposed in such a way that it imparts an asymmetry to the molecule as a whole.
		Since this molecule is Bent, those two polar bonds ADD TOGETHER to produce a molecule with a dipole moment.
		To determine whether a molecule is polar or not, 1.
	gemini.tntech.edu /~snorthrup/chem111/polar.html (446 words)

	Protein functionality
		Nonpolar amino acids are not soluble in water and thus, the interaction of water with these molecules is minimal.
		The water molecules that are bound through ion-dipole or dipole-dipole interactions are described as monolayer water, in which the molecules form a layer of tightly bound water around the protein molecule.
		This results in the formation of a monolayer of phospholipid molecules at the surface of the droplet oriented such that their hydrophobic groups are inserted into the lipid phase and their charged head groups are in contact with the aqueous phase..
	class.fst.ohio-state.edu /FST822/lectures/Funct.htm (10749 words)

	Chapter 9, Section 3 (Site not responding. Last check: 2007-10-09)
		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.
		Experimentally, the dipole moment of the molecule is 0.57 D. All diatomic molecules with polar bonds are polar molecules.
	cwx.prenhall.com /bookbind/pubbooks/blb/chapter9/medialib/blb0903.html (1451 words)

	[No title]
		In terms of overall covalent character for a given molecule the type of conclusion I can make based on those molecules which contain unbonded pairs of electrons on their central atom compared to molecules whose central atom lacks unbonded electron pairs is if the central atom is not completely paired it bent.
		The criteria I used to choose the molecule listed last as the least polar, or most nonpolar molecule, over its next competitor was symmetrical and no multiple bonds, thus not as much electron concentration between the two central carbon atoms.
		The proper geometric shape for this molecule is triangular planar, the bond angles between the atoms involved are 120 degrees and the appropriate orbitals that are formed during bond formation are triangular planar geometry.
	www.essay.org /school/english/chemistry.doc (1186 words)

	molecule -- Encyclopædia Britannica (Site not responding. Last check: 2007-10-09)
		A receptor molecule is a special protein whose shape is complementary to a portion of a foreign molecule.
		A nonpolar molecule is one whose charge distribution is spherically symmetric when averaged over time; since the charges oscillate, a temporary dipole moment exists at any given instant in a so-called nonpolar molecule.
		When a permeable membrane (a membrane that allows molecules to cross it) divides a heavily concentrated solution from a less-concentrated solution, there occurs a diffusion of molecules through the membrane and down their concentration gradient—that is, from the fluid with...
	www.britannica.com /eb/article-9053247 (839 words)

	Chapter 2
		Carbon dioxide is a nonpolar covalent molecule; its structure being linear.
		Water is a polar covalent molecule, with two hydrogen atoms located at the same end of the molecule and oxygen is at the opposite end.
		Water is a polar molecule, and it is an excellent solvent -- it is capable of dissolving a wide range of substances, especially salts.
	www.augusta.tec.ga.us /biology/ch2.htm (2437 words)

	Small Molecules, Water, Buffers
		Nonpolar molecules come into contact with one another (coalesce) in aqueous solutions, not because of any intrinsic affinity for one another, but because clustering of nonpolar molecules allows more water molecules to achieve a more stable, H-bonded arrangement.
		The introduction of nonpolar molecules into water puts nonpolar molecules in the way of water molecules seeking to form H bonds with their neighbors.
		Nonpolar molecules form clusters within a common "cage" (hydrophobic interactions) so that the total number of water molecules taken up in forming "cages" is minimized (more water molecules are free to interact via mutual H-bonding).
	www.people.virginia.edu /~rjh9u/IntroBio/bio201/lectures/Lecture02.html (700 words)

	ChemTeam: G.N. Lewis & The Covalent Bond
		Thus polar compounds with their mobile electrons fall readily into those combinations which represent the very few stable states, while the nonpolar molecules, in which the parts are held by firmer constraints, are inert and unreactive, and can therefore be built up into the numerous complicated structures of organic chemistry.
		This increase in the polar character of a molecule when combined with, or in the neighborhood of, other polar molecules is to a remarkable degree cumulative, for when two molecules by their approach or combination become more polar they draw other molecules more strongly towards them, but this still further increases their polar character.
		Thus between the perfectly symmetrical and nonpolar molecule C and the completely polar and ionized molecule represented by A there will be an infinity of positions representing a greater or lesser degree of polarity.
	dbhs.wvusd.k12.ca.us /webdocs/Chem-History/Lewis-1916/Lewis-1916.html (6968 words)

	Geom03 (Site not responding. Last check: 2007-10-09)
		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)

	Break-out Group Tasks
		Stable dispersion of non-polar molecules in water is accomplished when an amphipathic molecule, e.g., phosphatidyl choline, forms a bridge between individual water molecules and individual non-polar molecules.
		Student A: The usual behavior of a nonpolar molecule can be described as hydrophobic or fear of water; due to the fact that a nonpolar molecule does not have a concentration of a charge whereas a polar molecule does.
		When a nonpolar molecule comes into contact with water, a polar molecule, the nonpolar molecule has a tendency to clump together or melt into each other, rather than react with the water.
	academic.wsc.edu /frc/breakout.htm (554 words)

	Polarity (Site not responding. Last check: 2007-10-09)
		A dipole is a partial electrical charge on a portion of a molecule that is due to the unequal sharing of electrons by the atoms of the molecule.
		Molecules that are not ions or are not polar are termed nonpolar.
		Nonpolar molecules do not dissolve in water as they cannot form hydrogen bonds (thus are hydrophobic) but do dissolve in lipids or fats (lipophilic).
	www.austin.cc.tx.us /~emeyerth/polarity.html (528 words)

	Sep 16 Lecture
		Nonpolar molecules have a completely symmetrical charge distribution; there is no excess charge anywhere in the molecule.
		A quantitative measure of a molecule's polarity is its dipole moment.
		Molecules that are completely nonpolar have a dipole moment of zero.
	cas.bellarmine.edu /chem116a/lectures/sept16.htm (522 words)

	Forces and Bonding: The Intermolecular Forces Project
		Once we have an understanding of the electrical nature of the molecule, we are in a position to predict (in some cases) or to rationalize (in most cases) the properties, both physical and chemical, of the substance.
		However, it is possible for the dipole of the polar molecule to influence the electron distribution in a nearby non-polar molecule so as to induce a temporary dipole in the nonpolar molecule.
		It is dispersion forces that are responsible for the ability of nonpolar molecules to visit the liquid and solid states.
	www.wpi.edu /Academics/Depts/Chemistry/Courses/General/interforces.html (4801 words)

	Molecular Geometry, Page 2
		A Nonpolar Molecule is a system in which the net partial positive charge and net partial negative charge occur at the same location.
		Nonpolar systems are usually characterized as having high levels of symmetry overall.
		Nonpolar systems will have characteristics that are attributed to the lack of charges.
	www.bcpl.net /~kdrews/molegeo/molegeo2.html (894 words)

	BIOL 1400 -- Lecture Outline 32 (Site not responding. Last check: 2007-10-09)
		A molecule that has a charge on it -- either an ion, or a polar molecule -- will be attracted to water molecules.
		Molecules with both hydrophobic and hydrophilic parts are known as amphipathic.
		When you put phospholipids in water, the molecules will arrange themselves so that the "heads" face the water, and the "tails" are as far away from water molecules as possible.
	faculty.uca.edu /~benw/biol1400/notes32.htm (957 words)

	Polar Molecules
		When there are no polar bonds in a molecule, there is no permanent charge difference between one part of the molecule and another, and the molecule is nonpolar.
		For example, the three bonds in a molecule of BF are significantly polar, but they are symmetrically arranged around the central fluorine atom.
		The side of the water molecule containing the more electronegative oxygen atom is partially negative, and the side of the molecule containing the less electronegative hydrogen atoms is partially positive.
	www.mpcfaculty.net /mark_bishop/molecular_polarity.htm (207 words)

	General Chemistry Online: Glossary:
		Neurotransmitters are molecules that are used to carry signals from one neuron to another.
		A molecule in which the center of positive charge and the center of negative charge coincide.
		A molecule which is a basic building block of nucleic acids
	antoine.frostburg.edu /chem/senese/101/glossary/n.shtml (858 words)

	Chemistry Review
		The thermal energy of a molecule at room temperature (298 K) is ~0.6 kcal/mol; so you can see why it is very rare for a molecule to spontaneously break a covalent bond.
		Nonpolar molecules cannot form H-bonds with H2O, and therefore they are not soluble in H2O.
		Examples of nonpolar molecules are hydrocarbons, that is, compounds composed of only carbon and hydrogen atoms.
	www.bgsu.edu /departments/chem/midden/MITBCT/chem/review.html (979 words)

	States of Matter & Kinetic Theory
		Covalent Bonds: are the forces that hold atoms together within a molecule due to the sharing of electrons between the atoms.
		The larger the molecular mass of a Nonpolar compound, the greater the dispersion forces and the greater the boiling point of the liquid.
		of the molecules is the cause for Surface Tension.
	www.avon-chemistry.com /cond_states_lec.html (1778 words)

	Bonds
		When the nonpolar portions of a protein or any other molecule are exposed to the aqueous phase, they tend to spontaneously associate in a manner that minimizes contact with water.
		Measurements of the enthalpy of hydration of a number of nonpolar molecules yield values that are similar and negative.
		The negative values for the enthalpies of hydration and the positive free energy of transfer to the aqueous phase suggests that the aggregation of nonpolar molecules in an attempt to minimize their contact with water is entropically driven.
	class.fst.ohio-state.edu /FST822/lectures/Bonds.htm (2495 words)

	Nonpolar
		In some molecules, the bonding electrons are evenly distributed so that both ends of the molecule have the same amount of negative or positive charge.
		Notice that all the dark red (negative) is on the outside of the molecule and all of the dark blue (positive) is on the inside.
		This causes the molecule to be NONPOLAR because all the outermost parts of the molecule have the same electrostatic charge.
	www2.hawaii.edu /~etuthill/polar_molecules/nonpolar_2.htm (456 words)

	General Chemistry Online: Glossary:
		O (copper sulfate pentahydrate) are made of regularly repeating units, each containing 5 molecules of water weakly bound to a copper(II) ion and a sulfate ion.
		A nonpolar molecule or group that has little affinity for water.
		Hydrophobic groups on molecules in solution tend to turn in on themselves or clump together with other hydrophobic groups because they are unable to disrupt the network of strong hydrogen bonds in the water around them.
	antoine.frostburg.edu /chem/senese/101/glossary/h.shtml (1076 words)

	Dorlands Medical Dictionary
		(mo-lek´u-lər) of, pertaining to, or composed of molecules.
		any molecule that has an atomic mass between 350 and 2000 daltons; these accumulate in the body fluids of patients with uremia.
		a molecule in which the electrical potential is symmetrically distributed over the molecule.
	www.mercksource.com /pp/us/cns/cns_hl_dorlands.jspzQzpgzEzzSzppdocszSzuszSzcommonzSzdorlandszSzdorlandzSzdmd_m_18zPzhtm (3022 words)

	Polar/Nonpolar
		Therefore, when only water and oil are mixed, the hydrogen bonds of the water reform, excluding the nonpolar, hydrophobic oil molecules, which separate out at the top due to their smaller density.
		Soap is a molecule with a polar, hydrophilic head region and a long, nonpolar, hydrophobic tail.
		the nonpolar tails of the soap associate with the drops of oil, leaving the hydrophilic heads interacting with the water (this is called a micelle).
	www.coe.missouri.edu /~pgermann/DiscEvent/Molecular_Forces/Polar_Nonpolar/polar_nonpolar.html (699 words)

	Polar vs Nonpolar Molecules
		Most importantly, while all molecules like to stick to each other, oil molecules like to stick to other oil molecules more than they like to stick to water molecules.
		What you need is another type of molecules which both the water and the oil like to stick to more than they like to stick to each other.
		When you get a soap molecule in there, the water and the oil stick to it, and then the oil and water mix.
	www.newton.dep.anl.gov /askasci/chem99/chem99484.htm (625 words)

	Problem 9.26 (Site not responding. Last check: 2007-10-09)
		To predict whether or not a polyatomic molecule will have a dipole moment (i.e, be a polar molecule), we note that molecules in which the central atom is symmetrically surrounded by identical atoms are nonpolar.
		The molecular geometry is linear (two pairs, both bonding) - this is the case of linear AB, and the molecule is nonpolar.
		This molecule is of the general formula AB ; its molecular geometry is trigonal pyramidal (the only geometry for AB which leads to a nonpolar molecule is trigonal planar.) This species is polar.
	www.sou.edu /chem/ch201/ch9/9_26.htm (310 words)

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