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Articles 32821 - 32850 of 33002
Full-Text Articles in Chemistry
Influence Of Temperature And Acid On Time Of Set Of Silicic Acid Gels, Angelo J. Marotta
Influence Of Temperature And Acid On Time Of Set Of Silicic Acid Gels, Angelo J. Marotta
Honors Theses
The chief purpose of this research was to study the time of set of silicic acid gels produced by the reaction of phosphoric acid and sodium silicate solutions. The secondary purpose was to determine the hear of activation by means of the data procured through the main purpose. The times of set of these gels were measured at four different temperatures. The pH of each gel was measured also. The pH of the above mentioned gels ranged from a pH of 3 to a pH of 10.
The Effect Of The Change Of Ph During The Time Of Set, Upon The Time Of Set Of Silicic Acid Gels, Harris W. Paton
The Effect Of The Change Of Ph During The Time Of Set, Upon The Time Of Set Of Silicic Acid Gels, Harris W. Paton
Honors Theses
The study of this particular subject was made in the hope that it might lead to a more complete explanation of the manner of setting of gels. It was thought that by changing the pH during the time of set irregularities in the course of the setting of the gel might be found. It was thought, for example, that there might be a period during which the addition might have less effect than average, or a period where it would have a much greater than average effect. These periods might possibly have occurred at any part of the time of …
Freestone County, Texas [Water Quality Survey Of Wells And Springs With Test Hole Data, 1936], Samuel F. Turner
Freestone County, Texas [Water Quality Survey Of Wells And Springs With Test Hole Data, 1936], Samuel F. Turner
United States Geological Survey: Water Reports and Publications
Introduction
The purpose of this survey was to obtain information concerning existing wells and springs and the quantity and quality of water they yield, and to put down test holes where additional information was needed.
This project was part of a statewide Works Progress Administration project known as a "Statewide Inventory of Water Wells," sponsored by the [Texas] State Board of Water Engineers. The Division of Ground Water of the United States Geological Survey cooperated in the technical direction of the project and the Bureau of Industrial Chemistry of the University of Texas furnished laboratory space and equipment and supervised …
A Consideration Of The Cobalt Complexes, Jack Maloney
A Consideration Of The Cobalt Complexes, Jack Maloney
Chemistry Honors Papers
This 13 page thesis examines structural problems and preparation methods of complex cobalt compounds.
A Comparison Between The Percent Of Maltose Sugar In The Malt Wort And The Characteristics Of The Malt, William Black
A Comparison Between The Percent Of Maltose Sugar In The Malt Wort And The Characteristics Of The Malt, William Black
Bachelors’ Theses
Interest in this problem was brought about through working with malt in a malting laboratory. The curiosity of the author prompted research along the lines herein explained and a correlation between the amount of maltose in a malt wort and other variable factors explained in the following chapters was sought.
There has been a great deal of work done in the malting field which adapts itself readily to organic research. The chemistry of malt and malt products has arrived at a state where regular standard analysis can be applied. However, the research possibilities are practically unlimited and this work done …
Operational Characteristics Of The Differential Dynamometer: Conductometric Titrations, Raymond Joseph Melchione
Operational Characteristics Of The Differential Dynamometer: Conductometric Titrations, Raymond Joseph Melchione
Master's Theses
No abstract provided.
Studies On The Clarification Of Cane Juices In Louisiana., Subba M. R Rao
Studies On The Clarification Of Cane Juices In Louisiana., Subba M. R Rao
LSU Historical Dissertations and Theses
No abstract provided.
Preparation And Properties Of Alpha Nitrogen Derivatives Of Furan., Henry Marvin Singleton
Preparation And Properties Of Alpha Nitrogen Derivatives Of Furan., Henry Marvin Singleton
LSU Historical Dissertations and Theses
No abstract provided.
Some Reactions Of Creatinine With Certain Aliphatic Halogen Derivatives, Howard Edwards Wright Jr
Some Reactions Of Creatinine With Certain Aliphatic Halogen Derivatives, Howard Edwards Wright Jr
Master's Theses
The object of this investigation is to prepare some derivatives of creatinine from certain aliphatic halogen compounds with emphasis on the nature of the reactions through which condensation takes place.
Cleavage By Organic Magnesium Compounds., Maxwell Mcclelland Barnett
Cleavage By Organic Magnesium Compounds., Maxwell Mcclelland Barnett
LSU Historical Dissertations and Theses
No abstract provided.
A Kinetic Study Of A Homogeneous, Unimolecular Gaseous Decomposition Reaction., Harold Arthur Frediani
A Kinetic Study Of A Homogeneous, Unimolecular Gaseous Decomposition Reaction., Harold Arthur Frediani
LSU Historical Dissertations and Theses
No abstract provided.
Pyrochemical Changes In Missouri Halloysite, Frank Joseph Zvanut
Pyrochemical Changes In Missouri Halloysite, Frank Joseph Zvanut
Doctoral Dissertations
"For centuries it has been known that the application of heat to a clay or a clay body produces changes that make it an entirely different substance from the original raw clay. Ever since the earliest civilizations produced crude building brick by baking formed clay bodies in the sun's rays, mankind has been speculating on the nature of the changes that convert soft, friable, plastic clays into hard, strong, non-plastic, rock-like masses. It has been only within the last two decades, however, that progress has been made in the solution of problems dealing with the resultant products in fired clay …
The Preparation And Properties Of Diphenylthiocarbazone, Floyd C. Mcintire
The Preparation And Properties Of Diphenylthiocarbazone, Floyd C. Mcintire
Theses and Dissertations
At present the chemical literature offers no method for the preparation of diphenylthiocarbazone, or dithizone, sufficiently detailed to guide the average laboratory technician in an economical and successful preparation of this compound. The high price of dithizone and the limited number of dispensers of it emphasize the need of such a method. The original research reported in this thesis was done primarily in an attempt to formulate a satisfactory detailed method for the preparation of dithizone. The suggestions of Emil Fischer were followed and an attampt was made to improve his outline and to note the possible errors so that …
A Study Of Methods For The Recovery Of Silver, Bromine, Iodine, And Sodium Thiosulfate From Used Photographic Fixing Baths, Leroy Agustave Bay
A Study Of Methods For The Recovery Of Silver, Bromine, Iodine, And Sodium Thiosulfate From Used Photographic Fixing Baths, Leroy Agustave Bay
Masters Theses
"Sodium thiosulfate was one of the pioneer reagents used in photography, and is still the most important reagent used in photographic fixing. The solubility of the silver halides in an excess of sodium thiosulfate makes it important as a reagent for removing the undeveloped silver halides from the film. The life of a fixing bath is controlled by the halogen content. As the ratio of halogens to sodium thiosulfate is increased, the time required for fixing is also increased until the ratio reaches such a point that fogging of the film results. Most of the solutions are discarded long before …
A Biochemical Study Of Colloidal Sulfur., Gertrude L. Hendershot
A Biochemical Study Of Colloidal Sulfur., Gertrude L. Hendershot
Electronic Theses and Dissertations
No abstract provided.
Cellulose And Its Derivatives., Otis Willard Murray
Cellulose And Its Derivatives., Otis Willard Murray
Dissertations, Theses, and Masters Projects
No abstract provided.
Effect Of Salts On The Setting Time Of Silicic Acid Gels, Gustav F. Hallstrom
Effect Of Salts On The Setting Time Of Silicic Acid Gels, Gustav F. Hallstrom
Honors Theses
It has been stated by Prasad and Hattiangadi (1) that the process of setting of mixtures of solutions of sodium silicate and acetic acid consists of three stages: (a) The formation of silicic acid by the interaction of the acid with sodium silicate (b) The formation of the colloidal solution of silicic acid (c) The coagulation of the colloidal solution by the electrolytes liberated in the first reaction The present investigation was undertaken with a view to examine the effect produced on the time of setting of the silicic acid gels by the addition of extra quantities of electrolytes to …
Influence Of Temperature And Acid On Time And Set Of Silicic Acid Gels, Kenneth Jacob Frederick
Influence Of Temperature And Acid On Time And Set Of Silicic Acid Gels, Kenneth Jacob Frederick
Honors Theses
The underlying purpose of this research was to gain a further insight into the mechanism of the setting of silicic acid gels. The primary purpose, however, was to study the effect upon the heat of activation of the substitution of the weak acids, heretofore used almost entirely in the work done at Union College on these gels, by certain strong acids. The acids employed in this research were hydrochloric, nitric and sulphuric. Several gels were prepared from a standard silicate solution and each of these acids. Measurements of the time of set and pH were taken for each gel. Four …
Heats Of Solution In Liquid Ammonia, Herman Dettbarn Kluge
Heats Of Solution In Liquid Ammonia, Herman Dettbarn Kluge
Honors Theses
Liquid ammonia in many of its reactions and properties stimulates water. Next to water liquid ammonia is the best known electrolytic solvent. It dissolves a large number of salts to form, in general, conducting solutions, in which the ions are more mobile. Dilution Curve. The heat of dilutes is plotted against the change in the moles of ammonia. The curves approach a constant value which is the heat of dilution. These curves were plotted to compare the heat of dilution of ammonia chloride and ammonium bromide.
Time Of Set Of Silicic Acid Gels, Michael Priznar
Time Of Set Of Silicic Acid Gels, Michael Priznar
Honors Theses
The purpose of this work is to study the time of set of silicic acid gels as a function of the temperature. All data are confined entirely to acid gels made by mixing sodium silicate and an acid.
Change Of Conductivity Of Silicic Acid Gels Upon Setting, Robert E. Russell
Change Of Conductivity Of Silicic Acid Gels Upon Setting, Robert E. Russell
Honors Theses
During the studies made on the structure of silicic acid gels, several theories of gel formation have been proposed. The theory at present under consideration has to do with the polymerization of the molecule H2SiO3 into some of structure, most probably due to the splitting out of water molecules as is indicated.
The Vitamin D And Provitamin D Content Of Some Varieties Of Utah Wheat, Harold M. Nielsen
The Vitamin D And Provitamin D Content Of Some Varieties Of Utah Wheat, Harold M. Nielsen
All Graduate Theses and Dissertations, Spring 1920 to Summer 2023
Cereal grains were known to be notably deficient in the anti-rachitic principle even before the discovery of vitamin D. Clinicians had associated a type of rickets of infancy, characterized by an over-weight, flabby, bowlegged condition, with a diet consisting mainly of cereals. Mellanby (1) in 1921 concluded that this type of rickets is induced by overfeeding with carbohydrates. He also showed in the same report, however, that oatmeal, although it contains less carbohydrates than the other grains tested, possesses a special tendency toward rachitogenesis.
The Influence Of Ph On The Activity Of Trypsin And Papain (Caroid) As Measured By A Modification Of The Northrup Gravimetric Casein Method, Frank W. Dragan
The Influence Of Ph On The Activity Of Trypsin And Papain (Caroid) As Measured By A Modification Of The Northrup Gravimetric Casein Method, Frank W. Dragan
Bachelors’ Theses
Hydrogen ion concentrations have long been recognized as an essential factor in many biochemical processes.
The influence of hydrogen ion concentration upon enzyme activity has been of especial importance as proteolytic enzymes are rapidly gaining in use in various industries, principally the tanning industry.
Ua37/23 Whas Broadcast No. 31, Whas, Western Kentucky University, Earl Moore
Ua37/23 Whas Broadcast No. 31, Whas, Western Kentucky University, Earl Moore
WKU Archives Records
Script for weekly WKU broadcast on WHAS radio. This show included Kelly Thompson, Norma Lagura, C.P. McNally, Karl Beyer, Virginia Fortenberry, Helen Albritton, Paul McDaniel and B.T. Towery.
A Study Of Certain Physical And Chemical Effects Of Aromatic Halides, Unsaturated Carboxylic Acids, Saturated Ketohydroxy Acids, And Saturated Ketone Alcohols Upon Hydrocarbon Oils, Clyde Aubrey Crowley
A Study Of Certain Physical And Chemical Effects Of Aromatic Halides, Unsaturated Carboxylic Acids, Saturated Ketohydroxy Acids, And Saturated Ketone Alcohols Upon Hydrocarbon Oils, Clyde Aubrey Crowley
Master's Theses
No abstract provided.
A Study Of The Oxidation Of Aqueous Sulfide Solutions By Chlorine., Lester Cole Faulkenberry
A Study Of The Oxidation Of Aqueous Sulfide Solutions By Chlorine., Lester Cole Faulkenberry
LSU Historical Dissertations and Theses
No abstract provided.
An Investigation Into The Bromate Method Of Manganese Determination, Ray A. Bunday
An Investigation Into The Bromate Method Of Manganese Determination, Ray A. Bunday
Electronic Theses and Dissertations
Throughout the history of research in the science of Chemistry the problem of the quantitative determination of manganese has always been a perplexing one. The results have usually fallen short of the theoretical value and has necessitated the application of an empirical factor(1) which is always undesirable to the true research scientist, if not to the commercial analyst.
Nuclear Chemistry, J. William Buchta
Nuclear Chemistry, J. William Buchta
Journal of the Minnesota Academy of Science
No abstract provided.
A Study Of The Products Of The Reaction Between Stannous And Arsenate Ions In Silicic Acid Gels, Frank K. Thompson
A Study Of The Products Of The Reaction Between Stannous And Arsenate Ions In Silicic Acid Gels, Frank K. Thompson
University of the Pacific Theses and Dissertations
The fact that characteristic crystalline products result upon the diffusion of arsenate ions into silicic acid gel which has been impregnated with stannous ions has been known by the Pacific Chemistry Department for some time. The optimum conditions with regards to heat and hydrogen ion concentration have been determined. The purpose of this investigation was to study the products of the reaction. First to determine whether or not the silicic acid itself combined with the stannous and arsenate. ions in the formation of the crystalline product, and second to determine its chemical composition.
A Study Of Methods Of Determining The Rate Of Acid Hydrolysis Of Wheat Gluten, Angus V. Honrickson
A Study Of Methods Of Determining The Rate Of Acid Hydrolysis Of Wheat Gluten, Angus V. Honrickson
University of the Pacific Theses and Dissertations
Because of the nutritious value of sodium glutamate and its meat-like flavor, which is very pleasing to most people, and hence its demand if it were properly promoted, and because of the abundance of protein in accessible form for its manufacture, it is only reasonable to assume that if the optimum conditions of protein hydrolysis were found, the manufacturing could be made a highly successful enterprise. it was the purpose of this research to investigate the methods by which the hydrolysis of wheat glutes can do conveniently followed in order to determine the efficiency of reactions run under specific conditions.