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Topic: Compound (chemistry)

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	Chemistry - LoveToKnow 1911 (Site not responding. Last check: 2007-10-16)
		Chemistry and physics, however, meet on common ground in a well-defined branch of science, named physical chemistry, which is primarily concerned with the correlation of physical properties and chemical composition, and, more generally, with the elucidation of natural phenomena on the molecular theory.
		Compounds were denoted by joining the symbols of the components, and by varying the manner of joining compounds of the same elements were distinguished The symbol V was used to denote a liquid, and a vertical line to denote a gas.
		Compounds in which all the units of affinity of the contained elements are engaged are said to be saturated, whilst those in which the affinities of the contained elements are not all engaged by other elements are said to be unsaturated.
	www.1911encyclopedia.org /Chemistry (13027 words)

	Chemistry - MSN Encarta
		Modern chemistry was established in the late 18th century, as scientists began identifying and verifying through scientific experimentation the elemental processes and interactions that create the gases, liquids, and solids that compose our physical world.
		Chemistry is often called the central science, because its interests lie between those of physics (which focuses on single substances) and biology (which focuses on complicated life processes).
		Another important characteristic of a compound is that the weight of each element in the compound always has a fixed, definite ratio to the weight of the other elements in the compound.
	encarta.msn.com /encyclopedia_762504460/Chemistry.html (1442 words)

	Chemistry - Crystalinks
		Chemistry is the science that deals with the properties, composition, and structure of substances (defined as elements and compounds), the transformations that they undergo, and the energy that is released or absorbed during these processes.
		Chemistry, therefore, is concerned not with the subatomic domain but with the properties of atoms and the laws governing their combinations and with how the knowledge of these properties can be used to achieve specific purposes.
		Chemistry deals with the interaction of atoms to form molecules; Chemists use this knowledge to guide them in their work in studying all existing chemical compounds and in making new ones.
	www.crystalinks.com /chemistry.html (4612 words)

	Chemistry : Chapter 1 : Overview (Site not responding. Last check: 2007-10-16)
		The study of chemistry is the study of matter.
		Molecular compounds are usually combinations of nonmetal atoms that are chemically bonded into a group, called a molecule.
		Ionic compounds are held together by oppositely charged atoms or groups of atoms called ions.
	www.wwnorton.com /chemistry/overview/ch1.htm (1780 words)

	Education Resources » Chemistry Terms
		A molecule is the smallest particle of an element or compound that retains the chemical characteristics of the element or compound.
		The chemistry taught at the high school or early college level is often called “general chemistry” and is intended to be an introduction to a wide variety of fundamental concepts and to give the student the tools to continue on to more advanced subjects.
		Inorganic chemistry is the study of the properties and reactions of inorganic compounds.
	www.thecatalyst.org /resource/category/chemistry-terms/page/2 (6755 words)

	Highbeam Encyclopedia - Search Results for Compound
		compound COMPOUND [compound] in chemistry, a substance composed of atoms of two or more elements in chemical combination, occurring in a fixed, definite proportion and arranged in a fixed, definite structure.
		Compounds are combinations in fixed proportions of the chemical elements.
		Lineage organisation of the Tallensi compound: the social logic of domestic space in northern Ghana.
	www.encyclopedia.com /SearchResults.aspx?Q=Compound (538 words)

	AllRefer.com - compound (Chemistry) - Encyclopedia
		compound, in chemistry, a substance composed of atoms of two or more elements in chemical combination, occurring in a fixed, definite proportion and arranged in a fixed, definite structure.
		A compound is often represented by its chemical formula.
		Two or more distinct compounds that have the same molecular formula but different properties are called isomers.
	reference.allrefer.com /encyclopedia/C/compnd-che.html (174 words)

	chemhow
		Chemistry students should be able to assist in deciphering the prefixes and other attached numbers, letters, and symbols.
		If the compound in question is a newly discovered or synthesized compound it may be found only in the third or fourth edition of Beilstein - fortunately, students are rarely assigned a "new" compound.
		Quite often neither a citation on compound toxicity nor a citation on the synthesis of a compound is found in the 1987-1991 substance index.
	www.uni.edu /neuhaus/chemhow.html (1570 words)

	Chem4Kids.com: Atoms: Compounds
		Compounds are groups of two or more elements that are bonded together.
		Covalent compounds happen when the atoms share the electrons, and ionic compounds happen when electrons are donated from one atom to another.
		The new compound is not as reactive as the original elements.
	www.chem4kids.com /files/atom_compounds.html (384 words)

	General Chemistry Online: FAQ: Matter: What is a compound?
		Compounds are pure substances made of atoms of two or more elements chemically combined in fixed ratios.
		For example, table salt is not a compound because it is a mixture of sodium chloride, dextrose and calcium silicate (to keep it from clumping in high humidity) and potassium iodide (an important nutrient necessary for proper thyroid function).
		Compounds are completely different chemically and physically from the elements that form them.
	antoine.frostburg.edu /chem/senese/101/matter/faq/what-is-a-compound.shtml (238 words)

	[No title]
		Chemistry 13 - Chemical Principles: Chem 13 is a the standard second semester college level chemistry course at Penn State.
		Chemistry 14 - Experimental Chemistry: Chem 14 is an introductory chemistry laboratory that provides students the opportunity to put into practice the essential concepts that are relevant to Chem 12.
		Chemistry 15 - Experimental Chemistry: Chem 15 is a second semester chemistry laboratory that provides students the opportunity to put into practice the essential concepts that are relevant to Chem 13.
	www.personal.psu.edu /faculty/m/t/mth7 (858 words)

	compound - a definition from Whatis.com (Site not responding. Last check: 2007-10-16)
		1) In chemistry, a compound is a substance that results from a combination of two or more different chemical elements, in such a way that the atoms of the different elements are held together by chemical bonds that are difficult to break.
		Sometimes, when an element is exposed to a compound, a reaction occurs in which new compounds are formed (as when pure elemental sodium is immersed in liquid water).
		Examples of this usage include compound eye (found in various insects), compound microscope (a high-power magnifying instrument consisting of more than one lens), compound sentence (a sentence that is a conjunction or disjunction of smaller sentences), and compound document, an organized collection of user interfaces that form a single integrated perceptual environment.
	whatis.techtarget.com /definition/0,,sid9_gci859528,00.html (441 words)

	Sn2 Examples
		In 1967 C.J. Pedersen, a DuPont chemist, reported the results of a study of the chemistry of a group of cyclic polyethers that have since come to be called crown ethers.
		One of the simplest of these compounds is contains an 18-membered ring in which 6 of the atoms are oxygens.
		The formation of compound 25 involves nucleophilic substitution by hydroxide ion on the primary alkyl bromide that was produced by bromination of compound 24.
	www.usm.maine.edu /~newton/Chy251_253/Lectures/HostGuest/Sn2_Examples.html (746 words)

	Chemical compound - Wikipedia, the free encyclopedia
		O) is a compound consisting of two hydrogen atoms bonded to an oxygen atom.
		The atoms within a compound can be held together by a variety of interactions, ranging from covalent bonds to electrostatic forces in ionic bonds.
		Sodium chloride is an example of an ionic compound.
	en.wikipedia.org /wiki/Compound_(chemistry) (338 words)

	What is chemistry,
		Chemistry is a science that describes the physical properties, composition, structure and reactions of matter.
		Compounds can be described by their composition and structure.
		One property of pure compounds is that they follow the law of constant composition, that is they always have the same ratio of elements regardless of how the compound was made or where it came from.
	www.chemistry.ohio-state.edu /~woodward/ch121/ch1_intro.htm (671 words)

	Chemical Names for Compounds
		The other is identifying the elements contained in compounds, which is the first step in determining the formula and composition of compounds.
		As chemists learned more and more about the composition of simple compounds, it became important to develop a system for naming these compounds in a way that showed their elemental composition.
		When the elements can form two compounds, the ending on the first element is changed to indicate how much of the second element it has combined with.
	dl.clackamas.edu /ch104-03/chemical.htm (416 words)

	Organic Chemistry
		Basic organic chemistry can be thought of as a molecular Erector Set, if you know the number of carbon atoms and the type of bonds in a molecule, you can build the molecular structure.
		These compounds are named like the simple hydrocarbons, a prefix attached to a root ending (-anol for the alcohols).
		Most people are familiar with this organic compound as it is the active ingredient in "alcoholic" beverages such as beer and wine.
	web.jjay.cuny.edu /~acarpi/NSC/10-organic.htm (934 words)

	Elements and Compounds
		A compound is a substance formed when two or more elements are chemically joined.
		When the elements are joined, the atoms lose their individual properties and have different properties from the elements they are composed of.
		Letters, numbers, and symbols are used to represent elements and the number of elements in each compound.
	www.nyu.edu /pages/mathmol/textbook/compounds.html (458 words)

	UMass-Lowell leads charge toward green chemistry - The Boston Globe
		Green chemistry aims to replace toxic chemicals with environmentally benign substances while devising processes that reduce waste, pollution, and energy consumption.
		Warner, a Massachusetts native and onetime industrial chemist at Polaroid Corp., is considered among the founders of the green chemistry movement.
		Using his green chemistry principles, Pfizer revamped the process used in manufacturing sertraline, the active ingredient in the antidepressant Zoloft.
	www.boston.com /business/articles/2006/09/04/making_it_easier_to_be_green (938 words)

	McMaster Chemistry: Kruse
		The surface chemistry of 'simple' systems such as silicon is the subject of intense research around the world and a lot of nanoscience is based on it.
		However, from a chemist's point of view, compound semiconductors are much more interesting because of their more diverse and intriguing surface structure.
		Compound semiconductor surfaces are distinct from silicon in their considerable number of reconstructions that can arise from different stoichiometric compositions.
	www.chemistry.mcmaster.ca /kruse (610 words)

	Free: chemistry compound (Site not responding. Last check: 2007-10-16)
		December 09, is hydrogen, chemistry compound chemistry department are here:About>Homework the physical community, chemistry compound to contain 2004#Chemistry ap chemistry of the number, chemistry compound Chemistry Ionization professional chemistry compound Hangman GameElement history of chemistry asked questionsVersion but some of chemistry compound educational menus and at universities chemistry compound chemistry homework help
		Robbins Teaching Navigating from wastewater chemistry compound and regulations thermochemical, chemistry formula Thermochemical chemistry compound can drive by sponsoring it's more chemistry compound Science for body chemistry When you sign general and chemistry compound Microwave Paris.
		IRC of Transient chemistry compound water chemistry BC in Iran.
	chemistry.free-finding.com /chemistry-compound.html (697 words)

	Aromatic Compounds - Search Results - MSN Encarta
		Aromatic Compounds, in organic chemistry, a large group of compounds that usually contain closed rings of carbon atoms.
		Cyclic Compound, in organic chemistry, any compound that contains a ring of linked atoms.
		When all the linked atoms are carbon, the compounds are...
	uk.encarta.msn.com /Aromatic_Compounds.html (112 words)

	University of North Texas - Department of Chemistry
		Bachelor of Science in Chemistry; BS in Chemistry with a Concentration in Forensic Science Master of Science and
		Doctor of Philosophy with a major in chemistry; and concentrations at the graduate level in analytical chemistry, chemistry education, inorganic chemistry, organic chemistry, physical chemistry, and industrial chemistry (M.Sc.
		Recipients of the BS in Chemistry, and in some cases the BA and BA with Teaching Certification, are certified by the American Chemical Society (ACS) as meeting requirements for professional training of chemists.
	www.chem.unt.edu (314 words)

	Chemistry
		It has been in publication for many years and was developed to make Chemistry students "think" in the lab as opposed to filling in blanks.
		This manual is for the second lab course in General Chemistry at the University of Florida.
		A general Chemistry lab manual that is suitable for both large and small Chemistry programs.
	www.contemporarypublishing.com /College/Chemistry.htm (989 words)

	Chemistry News
		A re-examination of official figures, requested by the Royal Society, has shown that physics and chemistry graduates have declined by two and eight per cent respectively in the last decade.
		The 11th annual Carnival of Chemistry will be held this weekend on the University of Kansas campus.
		Two chemistry professors at Salisbury University hope their research will one day eradicate harmful effects of tuberculosis and pesticides.
	www.topix.net /science/chemistry (696 words)

	Chemistry : Periodic Table : boron : compound data [boron (III) oxide]
		For each compound, and where possible, a formal oxidation number for each element is given, but the usefulness of this number is limited, especially so for p-block elements in particular.
		Based upon that oxidation number, an electronic configuration is also given but note that for more exotic compounds you should view this as a guide only.
		The data on these compounds pages are assembled and adapted from the primary literature and several other sources including the following.
	www.webelements.com /webelements/compounds/text/B/B2O3-1303862.html (342 words)

	Chemistry: WebElements Periodic Table
		The periodic "law" of chemistry recognises that properties of the chemical elements are periodic functions of their atomic number (that is, the number of protons within the element's atomic nucleus).
		WebElements aims to be a high quality source of chemistry information on the WWW relating to the periodic table.
		Coverage is such that professional scientists and students at school interested in chemistry and other sciences will all find something useful.
	www.webelements.com (355 words)

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