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Topic: Chemical composition

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In the News (Sun 16 Jun 19)

  Chemical Composition
Mineral formulas are based on the relationship to unit cell volume and the positions of atoms within the unit cell.
The calculation of the chemical composition is straight-forward.
This is done for each element in the empirical formula and tabulated as the chemical composition.
webmineral.com /help/Composition.shtml   (299 words)

  TVA: Chemical Composition of Fine Particles
Chemical mass balance (CMB) modeling was used to analyze Chattanooga and Knoxville PM2.5 data.
Composition data from the Partnership Network consistently show that the two major constituents of PM2.5 mass in the Valley are organic carbon and sulfate, each constituting about one-third of the mass (Figure 2).
This composition is consistent with earlier CMB modeling results which indicated that regional sulfate and particulate matter related to mobile sources (vehicles) and biomass combustion sources (high organic carbon content) accounted for most of the fine mass.
www.tva.gov /environment/air/ontheair/part_composition.htm   (1243 words)

Compositions which are used to mimic or quantify the effect, in a chemical test procedure, of another chemical composition, or to stabilize, preserve or otherwise prepare a sample for a chemical test and the processes of use of such materials preparatory to a chemical test procedure.
Compositions and methods in which a chemical composition is designed to simulate the number of particles in some fluid of interest or to have a desired volume related property.
Compositions which are added to a sample for a chemical test which compositions serve to prevent deterioration of the sample, stabilize the pH, prevent the sample from coagulating, or increase the volume of the sample.
www.uspto.gov /go/classification/uspc436/defs436.htm   (5503 words)

 Nonexplosive chemical composition for gently breaking rock or concrete mass - Patent 4565579
A chemical composition according to claim 1, further comprising a viscosity increasing agent which is selected from the group consisting of methyl cellulose, carboxymethyl cellulose, polyvinyl alcohol and sodium polyacrylate and mixed with said principal component, said viscosity increasing agent amounting to up to 2% by weight of said principal component.
A chemical composition for gently breaking a rock or concrete mass, the composition comprising a principal component which is prepared by calcining a starting mixture comprising 100 parts by weight of quick lime and 1 to 20 parts by weight of calcium fluoride at a temperature of from about 800.degree.
A chemical composition according to claim 11, wherein the amount of said calcium fluoride is 2 to 10 parts by weight per 100 parts by weight of said quick lime.
www.freepatentsonline.com /4565579.html   (4324 words)

 Walton, J. C. --- The Chemical Composition of the Earth's Original Atmosphere
Even if the additional hypothesis that these molecules were retained in chemically combined form, such as carbonates and ammonium salts, is advanced, it would still be expected that much of the rare gases should be retained by occlusion within dust particles and larger fragments composing the cloud.
The chemically combined forms of carbon and nitrogen so far detected in cosmic dust clouds are volatile, low molecular weight compounds such as formaldehyde, hydrogen cyanide, methanol and acetaldehyde (11).
Chemical composition of pre-Cambrian slates with notes on the geochemical evolution of lutites.
www.grisda.org /origins/03066.htm   (5810 words)

 Patent 7,179,485
It is not reactive with, soluble in or a solvent for the encapsulated first chemical composition, the second material, the liquid in contact with the exterior surface of the membrane or the chemical composition (referred to herein and in the appended claims as the second chemical composition) in contact with the exterior of the membrane.
The second chemical composition, which as disclosed, is in contact with the exterior surface of the membrane can be substantially any water-soluble material which is not reactive with, soluble in or a solvent for the first material or the second material, but is reactive with the encapsulated first chemical composition.
Thereafter, utilizing the fluidized bed process, the first chemical composition to be encapsulated is introduced into a spray chamber and suspended therein by a flow of gas, such as air, while the mixture of hybrid polymer, solid and cross linker are sprayed against the suspended chemical composition to thereby form the capsule.
www.pharmcast.com /Patents100/Yr2007/Feb2007/022007/7179485_Capsules022007.htm   (2893 words)

 Chemical industry Summary
These are chemical compounds or mixtures that have beentested at multiple laboratories, using a variety of methods, and provide the basis for the validation of new tests and techniques, along with providing quality assurance for the laboratories themselves.
Chemical processes are used, including chemical reactions to form new substances, separations based on properties such as solubility or ionic charge, and distillations, in addition to transformations by heating and other methods.
Chemical industries are involved in the processing of raw materials obtained by mining, and agriculture among other supply sources, into materials and substances and chemical compounds that are end products, or are used in other industries.
www.bookrags.com /Chemical_industry   (1064 words)

 Unit 5 - The Mole & Chemical Composition
The average atomic mass of an element is the average mass of the element's isotopes weighted by the percentage of their natural abundance.
Chemical formulas are used to calculate molar masses of compounds.
Percentage composition gives the relative contribution of each element to the total mass of one molecule or formula unit.
www.msu.edu /~giangaco/Unit_Plans/Unit5.htm   (495 words)

 Solids-Solutions: chemical composition
Sizing Particle and droplet size are basic features that influence the properties and performance of solids, emulsions and sprays.
Composition Knowledge of the chemical composition of raw materials,
Phase Doppler Velocimetry Laser diffraction Sieve analysis particle characterization pore size distribution, porosity measurement, adsorption isotherm, BET surface area,particle size distribution, particle size analysis, surface characterization, chemical analysis, chemical composition, neutron activation analysis, dynamic light scattering, lab test,droplet size,
www.solids-solutions.com /10.html   (170 words)

 CiteULike: The chemical composition of measurable soil organic matter pools   (Site not responding. Last check: )
A range of spectroscopic, 'wet' chemical, gas chromatographic (GC) and mass spectrometric (MS) techniques was applied to the characterisation of three soil organic matter (SOM) fractions that have been proposed as the basis of a new SOM turnover model based on measurable, physically defined fractions.
Each technique revealed marked differences in chemical composition between the organomineral and the two light fractions, with the results being consistent with the organomineral fraction having different biological sources or having undergone a greater degree of degradation or transformation.
With the exception of carbohydrate composition, the results were consistent with the order of reactivity previously proposed from incubation studies with isotopically labelled substrates, namely: free > intra-aggregate > organomineral.
www.citeulike.org /user/johankool/article/600378   (688 words)

 Chemical Composition
The calculation of the chemical composition is straight-forward.
This is done for each element in the empirical formula and tabulated as the chemical composition.
Additional information provided is the chemical composition expressed as the % oxide of the element.
www.webmineral.com /help/Composition.shtml   (307 words)

 Chemical & Engineering News: Latest News - A Comet's Chemical Composition
An up-close look at the chemical composition of the heavenly body.
The study provides an unprecedented examination of the chemical nature of the interior of comets, which are thought to be composed of leftover debris from the formation of the solar system, and may help answer questions regarding the evolution of celestial objects.
Then And Now IR spectral details reveal the chemical composition of material ejected from comet Tempel 1 and provide a comparison with comet Hale-Bopp.
pubs.acs.org /cen/news/84/i29/8429notw1.html   (561 words)

 Chemical Composition
This is expressed as the percent composition which is the mass percentages of each different element in a compound.
The percentage composition of a compound leads directly to its empirical formula.
In order to obtain the molecular formula of a substance, you need to know the percent composition and the molecular weight.
library.thinkquest.org /10429/low/chemcomp/chemcomp.htm   (740 words)

 Single particle measurements of the chemical composition of cirrus ice residue during CRYSTAL-FACE
The first real-time, in situ, investigation of the chemical composition of the residue of cirrus ice crystals was performed during July 2002.
Mineral dust was the dominant residue observed in clouds formed during a dust transport event from the Sahara, consistent with a heterogeneous freezing mechanism.
These results show that chemical composition and size are important determinants of which aerosol particles form cirrus ice crystals.
www.agu.org /pubs/crossref/2004/2003JD004032.shtml   (383 words)

 Chemical Composition of American Coins
Chemical Composition of American Coins O'Connell, Lawrence P. Lincoln Park High School 9328 S. Parkside Ave.
understand the role that chemistry plays in identifying the composition of coins and in determining suitable substitutes if these compositions have to be changed.
Dependent on their ability in the field of stochiometry, students could be assigned various problems in this field various problems connected with the reaction.
www.iit.edu /~smile/ch8807.html   (353 words)

 chemical composition of human teeth
iron--mocking reminder that to gain admission to a house onedoes not `will' the door: one rings the bell--unless chemical composition of human teeth is rusty andhas chemical composition of human teeth obviously no one to answer it; in which case one chemical composition of human teeth away.Yet I did not go away.
The movement that I chemical composition of human teeth in despite chemical composition of human teeth myself,was towards the knob itself.
Yet one conceives that not chemical composition of human teeth men, if this particularevil come to pass, will stand packed shoulder.
drumier.com /1/chemical-composition-of-human-teeth.html   (435 words)

 Chemical Composition of Everyday Products — www.greenwood.com
Both high school and college collections strong in chemistry will want to add this helpful analysis to their collection: over 100 groups of products receive attention to not only chemical composition, but historic product use, functions, and related issues.
This book analyzes over 100 groups of products, identifying the specific chemical composition of a product, the historical use of the product, how it functions, and any associated environmental and/or human health issues.
Ten laboratory exercises provide students with the opportunity to observe these chemicals "in action." Readers will learn which chemical elements are in everyday products and how they may affect health and environment, assisting them in making educated choices as consumers.
www.greenwood.com /catalog/GR2579.aspx   (307 words)

 Investigation of the relationship between chemical composition and size distribution of airborne particles by partial ...
Three latent variables summarized chemical composition data and most variations in size distribution data especially for large particles and proved the existence of the linearity between the two data sets.
The size distribution, particle composition, and gas composition data were combined and analyzed by PMF.
Index Terms: 0305 Atmospheric Composition and Structure: Aerosols and particles (0345, 4801, 4906); 0345 Atmospheric Composition and Structure: Pollution: urban and regional (0305, 0478, 4251); 0478 Biogeosciences: Pollution: urban, regional and global (0345, 4251); 0394 Atmospheric Composition and Structure: Instruments and techniques.
www.agu.org /pubs/crossref/2005/2004JD005050.shtml   (391 words)

 Algal Chemical Composition – Proteins, Carbohydrates & Lipids Content in Algae
Chemical Constituents of Marine Algae off Karachi Coast (PDF)
Fixed oils from seeds, nuts and vegetables are typically composed of triglyceride molecules (also known as triacylglycerol or triacylglyceride).
Omega-3 fatty acids – in which the first double bond in on carbon #3 - are prevalent in fish oils and flax seeds.
www.oilgae.com /algae/comp/comp.html   (1118 words)

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