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Topic: Equivalent weight (chemistry)

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  AllRefer.com - equivalent weight (Chemistry) - Encyclopedia
The equivalent weight of an element or radical is equal to its atomic weight or formula weight divided by the valence it assumes in compounds.
The unit of equivalent weight is the atomic mass unit; the amount of a substance in grams numerically equal to the equivalent weight is called a gram equivalent.
Iron (atomic weight 55.847) has an equivalent weight of 27.924 in ferrous compounds (valence 2) and 18.616 in ferric compounds (valence 3).
reference.allrefer.com /encyclopedia/E/equivale.html   (312 words)

 AG380   (Site not responding. Last check: 2007-10-29)
The weight of that unit known as a mole would be equivalent to the atomic or molecular weight of the atom or molecule in grams.
The atomic weight of sodium is 23 and the atomic weight of chlorine is 35.
An equivalent weight is the same as molar mass but with an adjustment for the number of moles of hydrogen, electrons or univalent cations furnished or combined with by the reacting substance.
www.agpowermicro.org /ag380/labs/1.htm   (2398 words)

 Equivalent weight - Wikipedia, the free encyclopedia
Equivalent weight is the atomic weight of an element or radical divided by the valence it assumes in a chemical compound.
When choosing primary standards in analytical chemistry, compounds with higher equivalent weights are generally more desirable because weighing errors are reduced or minimized.
The equivalent weight of a substance may be defined as that weight of it which will react with or produce one mole of hydrogen.
en.wikipedia.org /wiki/Equivalent_weight   (260 words)

 Etherington & Roberts. Dictionary--equivalent weight   (Site not responding. Last check: 2007-10-29)
Equivalent weights are in direct proportion to the areas of single sheets.
In chemistry, equivalent weight is one of the comparative weights of different compounds, elements, or radicals which possess the same chemical value for reaction when compared by reference to the same standard (usually oxygen, i.e., 8).
In an acid, the equivalent weight is the quantity which would yield one gram ionic weight of hydrogen ion (1.008 g.), while in a base, it is the quantity which would yield one gram ionic weight of hydroxyl ion (17.008 g.).
palimpsest.stanford.edu /don/dt/dt1206.html   (331 words)

This course is a transition semester of chemistry to be taken before Chemistry C071 designed for students who have not had enough preparation in chemistry or mathematics to directly take Chemistry C071.
This course is intended to prepare students for General Chemistry by emphasizing the mathematical basis of chemistry and laboratory measurements.
Prerequisite: Chemistry 0129, Chemistry 0213 and Chemistry 231.
www.temple.edu /bulletin/ugradbulletin/ucd/ucd_chemistry.html   (2245 words)

 Equivalent Weight
By definition one equivalent (or equivalent weight) of a substance is the amount of that substance which supplies or consumes one mol of reactive species.
In order to determine the equivalent weight of a substance you must know something about the reaction but it does not have to be balanced.
Equivalents can help in the analysis of a substance when the balanced reaction is not known or cannot be written for whatever reason; because one equivalent always reacts with one equivalent.
chem.lapeer.org /Chem2Docs/EqWtofAcid.html   (557 words)

Since the dissociation of one mole of hydrochloric acid yields one equivalent of hydrogen and one equivalent of chloride, the equivalent weight is equal to the gram molecular weight of hydrochloric acid.
Thus the equivalent weight of sulfuric acid is one-half the gram molecular weight of sulfuric acid.
An osmol is the weight of a chemical substance dissolved in one liter of water that exerts an osmotic pressure equal to that exerted by a gram-molecular weight of an unionized substances dissolved in one liter of water.
www.rx.uga.edu /main/home/dstrong/phrm4130/MEQ.html   (1866 words)

 AllRefer.com - molecular weight (Chemistry) - Encyclopedia
The molecular weight may be calculated from the molecular formula of the substance; it is the sum of the atomic weights of the atoms making up the molecule.
The molecular weights of substances that are not normally gaseous and do not evaporate without decomposition are sometimes determined from their effects on the melting point, boiling point, vapor pressure, or osmotic pressure of some solvent (see colligative properties).
The number-average molecular weight determined by the ultracentrifuge method gives a value that is equal to the weight of the sample divided by the number of molecules in the sample.
reference.allrefer.com /encyclopedia/M/molecwght.html   (569 words)

 Chemistry - Printer-friendly - MSN Encarta
Chemists sometimes use percent to indicate concentration, and by convention indicate whether the percent is by weight or volume.
A 10 percent solution of sodium chloride is thought of as 10 weight units of salt in 90 weight units of water.
Molecular weight is derived by summing the atomic weights of the atoms composing a molecule.
encarta.msn.com /text_762504460___64/Chemistry.html   (1215 words)

 equivalent weight - HighBeam Encyclopedia
equivalent weight The equivalent weight of an element or radical is equal to its atomic weight or formula weight divided by the valence it assumes in compounds.
The unit of equivalent weight is the atomic mass unit ; the amount of a substance in grams numerically equal to the equivalent weight is called a gram equivalent.
The sulfate radical (SO) has formula weight 106.062 and always has valence 2 in compounds, so its equivalent weight is 53.031.
www.encyclopedia.com /doc/1E1-equivale.html   (438 words)

 Equivalent (chemistry) - Wikipedia, the free encyclopedia
The equivalent (Eq or eq) is a reasonably common measurement unit used in chemistry and the biological sciences.
Hence, the equivalent weight of a given substance is effectively equal to the amount of substance in moles, divided by the valence of the substance.
In practice, the equivalent weight often has a very small magnitude, so it is frequently described in terms of milliequivalents (mEq or meq) -- the prefix milli denoting that the measure is divided by 1000.
en.wikipedia.org /wiki/Equivalent_(chemistry)   (393 words)

 GSU Chemistry Graduate Program
(3) Prerequisites: Chem 3410 and 6110 or equivalent.
Prerequisites: Chem 6110 and Chem 6120, or equivalent.
Bioanalytical Chemistry I. Prerequisite: Chem 6190 or consent of instructor.
chemistry.gsu.edu /School/courses.php   (1181 words)

 Nobel Prize in Chemistry 1937 - Presentation Speech
When the Nobel Prize in Chemistry was distributed for the second time, in the year 1902, it was awarded to the scientist of genius Emil Fischer, in recognition of his investigations partly concerning sugars and partly relating to caffeine and substances allied thereto.
Further, the weight of the atoms of the different elements, expressed for instance in relation to the atom of hydrogen, has long been known, the hydrogen atom being the lightest of all the elements.
It is likewise possible to determine the weight of a particle, or molecule, of a compound, expressed in the same measure.
nobelprize.org /nobel_prizes/chemistry/laureates/1937/press.html   (2451 words)

 Units: E
One equivalent weight of an element, compound, or ion is the weight in grams of that substance which would react with or replace one gram of hydrogen.
Since one gram of hydrogen is very nearly equal to one mole and since hydrogen has one electron free to react with other substances, 1 Eq of a substance is effectively equal to one mole divided by the valence of the substance (the number of electrons the substance would engage in participating in the reaction).
Equivalently, one erg is the kinetic energy of a mass of 2 grams moving at a velocity of 1 cm/sec.
www.unc.edu /~rowlett/units/dictE.html   (2561 words)

 Chemistry Department   (Site not responding. Last check: 2007-10-29)
During a typical project, the student completes a literature search as the basis for a written project proposal, meets weekly with his collaborating professor to discuss the progress of his work, presents at least one research seminar, and completes a formal technical report of his investigations.
Projects involve advanced synthetic techniques in biochemistry and in organic and inorganic chemistry, chemical analysis and structure determination by instrumental methods, computer acquisition and reduction of data, and instrumental development and evaluation.
That it is successful is evidenced by the number and quality of chemistry majors and by the success of recent graduates (over 80% of whom have gone on to graduate or professional school).
www.hsc.edu /academics/chemistry/curriculum.html   (972 words)

 equivalent definition - Dictionary - MSN Encarta
That's equivalent to the amount of energy needed to power a single light bulb.
mathematics logic in equivalence relation: describes members of a set that are in a reflexive, symmetrical, and transitive relation with each other
He's the Italian equivalent of a district attorney.
encarta.msn.com /dictionary_/equivalent.html   (198 words)

 Equivalence relation - Article from FactBug.org - the fast Wikipedia mirror site
Equivalence relations are often used to group together objects that are similar in some sense.
Every equivalence relation on X defines a partition of X into subsets called equivalence classes: all elements equivalent to each other are put into one class.
If an equivalence relation ~ on X is given, then the set of all its equivalence classes is the quotient set of X by ~ and is denoted by X/~.
www.factbug.org /cgi-bin/a.cgi?a=9259   (824 words)

 [No title]
] The atomic weight of an element expressed in grams, that is, the atomic weight on a scale on which the atomic weight of carbon-12 isotope is taken as 12 exactly.
] The equivalent weight of an element or compound expressed in grams on a scale in which carbon-12 has an equivalent weight of 3 grams in those compounds in which its formal valence is 4.
] The molecular weight of compound expressed in grams, that is, the molecular weight on a scale on which the atomic weight of carbon-12 isotope is taken as 12 exactly.
www.accessscience.com /Dictionary/G/G15/DictG15.html   (1809 words)

 Carolina Biological: Chemistry: Solution Preparation
In acid-base chemistry, an equivalent is the mass of chemical that donates or accepts one mole of protons.
To prepare a 1 N solution of sulfuric acid, slowly add 0.5 gram formula weight of sulfuric acid to a clean 1-L volumetric flask and fill to the mark with distilled or deionized water.
In redox chemistry, an equivalent is the mass of chemical that donates or accepts one mole of electrons.
www.carolina.com /chemistry/resources/solution_preparation.asp   (1230 words)

Option II (Environmental Chemistry Option) prepares students for careers in environmentally related areas, for advanced study in environmental health, for teaching chemistry at the high school level, and for in-service personnel to enhance their knowledge of new analytical techniques.
Prerequisites: Chemistry 332 and 401 or Chemistry 334 and 401.
Prerequisites: Chemistry 332 or 334 and Chemistry 352 or 355.
www.csun.edu /search/cat9698/Chemistry.htm   (3440 words)

 Chemistry 103 Notes
One of the scientist, Berthollet's believed it was the latter but Joseph Louis Proust (1754 - 1826), who fled to Spain to avoid the revolution believed Berthollet was wrong and that the elements did combine in fixed and definite proportions, independent of the method of preparation.
His "Second Law of Electrolysis" was that the weight of metal liberated by a given quantity of electricity is proportional to the equivalent weight of the metal.
Faraday was never happy with this idea and it was not until the end of the 19th century that the "atoms of electricity" were identified as electrons.
chemistry.mtu.edu /~pcharles/SCIHISTORY/05atoms.html   (1614 words)

 Department of Chemistry   (Site not responding. Last check: 2007-10-29)
A degree in chemistry or biochemistry is suitable preparation for a variety of career choices, including immediate employment in the chemical, biochemical, environmental, and related industries, or graduate study in chemistry, biochemistry, chemical physics, biophysics, or medicine.
Chemistry courses at the 4000 level applied toward either the chemistry or biochemistry majors must be taken at The Florida State University unless specifically exempted by the chair on written request.
Chemistry and biochemistry majors are required to take two semesters of calculus-based physics as preparation for Physical Chemistry I and II (CHM 4410 and CHM 4411).
registrar.fsu.edu /9899general/chemistry.html   (3724 words)

 GMU Chemistry & Biochemistry Course Descriptions
Course is primarily intended for those who are interested in the application of the principles of organic chemistry and biochemistry to related areas of science such as genetics, microbiology, physiology, and nutrition.
Basic facts and principles of chemistry, including atomic and molecular structure, gas laws, kinetics, equilibrium, electrochemistry, nuclear chemistry, and the properties and uses of the more important elements and their compounds.
Physical chemistry of macromolecules including molecular weight, conformation, configuration, characteristics of the glassy state, methods for studying polymer morphology (XRD, SEM, TEM, optical microscopy), electronic structure and behavior, band theory, conduction mechanisms, intrinsically conductive polymers, polarization, dielectric behavior, triboelectric behavior, piezo/pyroelectric behavior, and non-linear optical properties.
www.gmu.edu /depts/chemistry/courses.html   (2590 words)

 #1 Site For Learning Chemistry
The atomic weight of sodium (Na) is 23.
The gram equivalent weight is equal to the molecular weight expressed as grams divided by the ‘valency’ of the solute.
Thus the electromechanical equivalent Z of a substance is defined as the amount of substance in grams liberated at any electrode when one coulomb charge is passed through an electrolyte.
home.att.net /~cat6a/electrolysis-III.htm   (745 words)

 Course Descriptions for Chemistry and Biochemistry, SUNY College of Environmental Science and Forestry
This first semester general chemistry course is organized around the physical and chemical properties of matter.
The second course in general chemistry continues the development of chemical reactivity by focusing on chemical kinetics and chemical equilibrium.
Prerequisites: FCH 360 and FCH 552 or equivalent; consent of instructor.
www.esf.edu /chemistry/courses.htm   (1593 words)

CHEM 312 Inorganic Chemistry (3) NW The periodic table: chemistry of representative and transition elements.
CHEM 396 Research in Chemistry and the Chemical Sciences (1) NW Presentations by researchers in academia and industry describing the opportunities for research chemistry and biochemistry.
CHEM 414 Chemistry of the Main Group Elements (3) NW The elements and their compounds in relation to the periodic system.
www.washington.edu /students/crscat/chem.html   (3994 words)

 Category:Chemistry - Wikipedia, the free encyclopedia (via CobWeb/3.1 planetlab2.tamu.edu)   (Site not responding. Last check: 2007-10-29)
Chemistry is the science of matter, its structure, chemical reactivity and properties, and the transformations it undergoes.
It is often called "the central science" because it is concerned with the fundamental energy or forces that hold matter together studied in physics and the molecular systems and characteristics of the complex organisms studied in biology (see physics, biology).
Consequently, chemistry includes the study of microscopic phenomena, such as clusters of atoms and their characteristics on the nanometre scale, and macroscopic phenomena, such as the interaction of proteins and DNA in complex solutions and the properties of new materials
en.wikipedia.org.cob-web.org:8888 /wiki/Category:Chemistry   (266 words)

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