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Articles 33961 - 33990 of 34514
Full-Text Articles in Physical Sciences and Mathematics
Analytical Data (1951), Walter A. Lawrance
Analytical Data (1951), Walter A. Lawrance
Walter Lawrance Papers
No abstract provided.
Enrichment Of Tin Activity Through The Szilard-Chalmers Separation, Herta W. Spano
Enrichment Of Tin Activity Through The Szilard-Chalmers Separation, Herta W. Spano
Chemistry and Chemical Biology ETDs
It was the purpose of this investigation to utilize the Szilard-Chalmers reaction in order to prepare tin solutions of high specific activity.
Tetraphenyl tin was chosen for the target compound. It is a white, crystalline solid of excellent thermal stability. No data have been reported in the literature on the rate of exchange between inorganic forms of tin and tetraphenyl tin but it seemed highly probable that this exchange would be very slow. Tetraphenyl tin is soluble in various organic solvents but insoluble in water, and this suggested solvent extraction as a possible means of separation of the activated tin …
The Peroxide Numbers Of Vegetable Oils, Robert J. Bruce
The Peroxide Numbers Of Vegetable Oils, Robert J. Bruce
Bachelors’ Theses
A survey of the literature will indicate that the peroxide numbers of fats and oils are of importance in ii many industries. The dairy, fish oil, vegetable oil, and meat processing industries all have use for peroxide number determinations. as a measure of the degree of rancidity of their products. The paint industry has used it in the study of protective coatings, and the textile industry has used it in the study of the lubrication of fibers. All of these uses were applied to the study of partial oxidation of the samples under consideration.
Since the various methods in use …
Solubility Product Constants Of The Metallic Sulfides, Marvin Bernard Gordon
Solubility Product Constants Of The Metallic Sulfides, Marvin Bernard Gordon
Theses and Dissertations
A survey of the chemical literature revealed a lack of agreement in the values reported by various investigators for the solubility product constants of the metallic sulfides. The object of this thesis was to obtain a reliable set of solubility product constant values for the metallic sulfides by means of thermodynamic calculations. Of considerable importance in calculating the values of the solubility product constants of the metallic sulfides is the value of the standard free energy of formation of the sulfide ion. A critical review of the values that have been reported by various investigators for this constant , including …
2-Pyrrolidinoethyl Esters Of Para Alkoxybenzoic And Para Alkox Alkoxycinnamic Acids, Michael James Fletcher
2-Pyrrolidinoethyl Esters Of Para Alkoxybenzoic And Para Alkox Alkoxycinnamic Acids, Michael James Fletcher
Master's Theses
One of the most important groups of local anesthetics is the class of alkyl and dialkylaminoalkyl esters of aromatic acids. Of these compounds, the diethylaminoethyl esters are particularly valuable.
It is obvious that pyrrolidine is merely a modified form of diethylamine. The purpose of this work is to learn the effect of substituting the N-pyrrolidyl nucleus for the diethyl amino nucleus in various esters of the local anesthetic type.
Derivatives Of M-Xylene, Henry J. Muller
Derivatives Of M-Xylene, Henry J. Muller
Chemistry and Chemical Biology ETDs
Since m-xylene of 95-98% purity has recently become available from petroleum, this is an appropriate time to prepare an examine its derivatives. Isophtalic and m-toluic acids can be prepared from the hydrocarbon. The purpose of this work was to prepare imidazolines from these acids
Phase Behavior Of Sodium Stearate In Anhydrous Cyclohexane, Walter Edward Reid Jr.
Phase Behavior Of Sodium Stearate In Anhydrous Cyclohexane, Walter Edward Reid Jr.
Master's Theses
Soap solutions, aqueous and non-aqueous, are characteristic in that they firm colloidal systems at certain concentrations, the properties of which are influenced by temperature and pressure. Application of the Gibbs phase rule to such systems makes possible the location of the various phases of a particular system and hence enables phase diagrams to be constructed. For systems of soap-hydrocarbons such as are found in fuels, beauty preparations, greases, medical preparations, etc., a phase diagram would show very readily the most satisfactory composition for the conditions desired.
Studies On Some Reactions Of Portland Cement, Edward Shannon Clark
Studies On Some Reactions Of Portland Cement, Edward Shannon Clark
Honors Theses
Studies are made on 1. The mechanism of cement setting, 2. Cement – sawdust mixtures, 3. The effect of soluble compounds on cement, 4. Cement – latex mixtures and 5. Cement – plastic compositions.
Inhibition Of The Thermal Polymerization Of Styrene, Herman Ernst Opitz
Inhibition Of The Thermal Polymerization Of Styrene, Herman Ernst Opitz
Honors Theses
It is the purpose of this thesis to further study the inhibition of the thermal polymerization of styrene along the same lines as Cohen, and wherever necessary to improve and correct his work.
The Effect Of Electrolytes On The Viscosity Of Protein Solutions, Thomas Anthony White
The Effect Of Electrolytes On The Viscosity Of Protein Solutions, Thomas Anthony White
Honors Theses
This project was undertaken to study the Hofmeister series and Loeb's contention that it is incorrect. The protein chosen for study was gelatin. The three salts used were: sodium chloride, sodium acetate and sodium nitrate.
The Reliquefaction Of Zirconia Gels, Hubert Joseph Keily
The Reliquefaction Of Zirconia Gels, Hubert Joseph Keily
Honors Theses
The initial reliquefaction of zirconia gels at room temperatures seems to be unique. The following study was made to provide a further description of this phenomenon and to attempt to suggest the nature of it.
A Study Of The Mechanism Of The Reaction Between Styrene And Tung Oil, Rowan Joseph Coyle
A Study Of The Mechanism Of The Reaction Between Styrene And Tung Oil, Rowan Joseph Coyle
Honors Theses
It is the purpose of this thesis to study the possible mechanisms by which styrene may react with tung oil. To this end, styrene is reacted with tung oil, using a peroxide catalyst, the reaction product is separated into its components, and a preliminary analysis of these components is made, in an attempt to determine whether the reaction occurs through a Diels-Alder or a co-polymerization type mechanism.
Electrodeposition Apparatus Employing A Controlled Cathode Potential, Carl Arthur Hirt
Electrodeposition Apparatus Employing A Controlled Cathode Potential, Carl Arthur Hirt
Honors Theses
The present work was undertaken with the idea of building a simple electrodeposition apparatus employing a controlled cathode potential so that quantitative separations and determinations of various cations could be made. When finished the apparatus was to be employed in the investigation of electrochemical problems. However, so many difficulties arose in the construction of the apparatus that there was not time available for this latter work.
Catalytic Vapor Phase Ethylation Of Phenol, George Wendell Putman
Catalytic Vapor Phase Ethylation Of Phenol, George Wendell Putman
Honors Theses
The object of this research was to study the reaction between ethyl alcohol and phenol and to try to identify some of the products. Further study of the effect of catalyst on the reaction was also undertaken.
The Ultraviolet Absorption Of Some Nitrogen Heterocycles, Benzotriazole, Benzimidazole, Indazole, Indole, John Edward Fagel Jr.
The Ultraviolet Absorption Of Some Nitrogen Heterocycles, Benzotriazole, Benzimidazole, Indazole, Indole, John Edward Fagel Jr.
Honors Theses
The ultraviolet absorption spectra of benzotriazole, 5, (6)-chloro-benzotriazole, benzimidazole, indazole, and indole have been determined in aqueous solutions of varying acidity in the region 210-300 mmu. An attempt has been made to correlate the absorption spectra of these compounds with their molecular structure. The acidic dissociation constants of several of the compounds have been determined graphically from the absorption data.
The Synthesis Of 3-Ethyl-9-Acetylphenanthrene, Elizabeth R. Bender
The Synthesis Of 3-Ethyl-9-Acetylphenanthrene, Elizabeth R. Bender
Bachelors’ Theses
In 1929 , there was recognized a relatively small number of naturally occurring phenanthrene compounds as compared with those known today. These compounds include several groups of substances which are as strikingly similar in structure as they are different in their actions on the animal organism. For instance, the structure of the sterols and bile acids contain the perhydrocyclopentenophenanthrene ring system. Upon later research, it was found that the sex hormones and cardiac glycosides (heart poisons secreted by toads) have a structure very similar to this system. They are all derivatives of cyclopentenophenanthrene.
The Chemical Characteristics Of 8.0-Day I^131 Produced By The Beta Decay Of 25-Minute Te^131 In Organic Liquids, Francis J. Keneshea Jr.
The Chemical Characteristics Of 8.0-Day I^131 Produced By The Beta Decay Of 25-Minute Te^131 In Organic Liquids, Francis J. Keneshea Jr.
Chemistry and Chemical Biology ETDs
In 1934 Szilard and Chalmers found that a large fraction of the radioactive iodine produced in the thermal neutron irradiation of ethyl iodide could be extracted from the irradiated material. The procedure followed was to add a trace of carrier iodine to the irradiated liquid, extract the iodine with an aqueous solution of a reducing agent and precipitate the iodide as silver iodide. The silver iodide precipitate obtained in this manner contained a large fraction of the iodine activity (25-minute I128), at a high specific activity. Since ethyl iodide is not soluble in water and hence is not …
The Kinetics Of The Exchange Between Benzyl Iodide And Iodide Ion, Paul Stillson
The Kinetics Of The Exchange Between Benzyl Iodide And Iodide Ion, Paul Stillson
Chemistry and Chemical Biology ETDs
In the investigation to be described here, the exchange reaction was carried out in methyl alcohol, ethyl alcohol, and acetone-alcohol mixtures. Radioactive I131 was used as a tracer throughout the investigation. A mechanism was postulated for this reaction in each solvent and activation energies were determined.
The Factors Influencing The Rate Of Polymerization In The Formation Of Propylene Phthalate, Guenter R. Ackermann
The Factors Influencing The Rate Of Polymerization In The Formation Of Propylene Phthalate, Guenter R. Ackermann
Chemistry Honors Papers
This 16 page thesis examines several methods to determine the rate of reaction of propylene glycol with phthalic anhydride.
Rate Of Reaction And Order Of The Esterification Of Propylene Glycol With Acetic Acid, Thrygve R. Meeker
Rate Of Reaction And Order Of The Esterification Of Propylene Glycol With Acetic Acid, Thrygve R. Meeker
Chemistry Honors Papers
This 18 page thesis examines the determination of order and specific reaction rate of esterification of propylene glycol with acetic acid at forty degrees centigrade.
Stability And Concentration Effects In The Use Of Siloxene As A Chemiluminescent Indicator In Redox Titrations, William F. Burkhardt
Stability And Concentration Effects In The Use Of Siloxene As A Chemiluminescent Indicator In Redox Titrations, William F. Burkhardt
Chemistry Honors Papers
This 22 page thesis attempts to determine the limitations of, and to extend the applicability of siloxene as a chemiluminescent indicator in redox titrations.
A Study Of The Structures Of Some Compounds Of The Symmetrical Triazine Series By Means Of Their Ultraviolet Spectra, Robert William Schaefer
A Study Of The Structures Of Some Compounds Of The Symmetrical Triazine Series By Means Of Their Ultraviolet Spectra, Robert William Schaefer
Honors Theses
The purpose of this work is to investigate the ultraviolet absorption spectra of symmetrical triazines with the outlook of correlating, on a theoretical basis, the date obtained with molecular structure.
Investigations Into The Synthesis Of Indazole, Albin Joseph Rzeszotarski
Investigations Into The Synthesis Of Indazole, Albin Joseph Rzeszotarski
Honors Theses
These investigations were undertaken in order to prepare a suitable quantity of pure indazole for further research by other student. A secondary and equally important purpose of the work was to study the products of the reaction carried out and their relative abundance under varying conditions of pH. A suitable electronic mechanism for the reaction was to be proposed.
Indazole, at present, has no commercial applications, and is not produced (to the author's knowledge) by any large chemical concern. The interest in this compound is chiefly due to the several structural formulae which have been assigned to it and which …
Preparation Of 3-Methylphenanthrene, Yvonne C. Bestler
Preparation Of 3-Methylphenanthrene, Yvonne C. Bestler
Bachelors’ Theses
The year 1929 witnessed the opening expansion of the previously small list of naturally occurring phenanthrene compounds. The new groups of substances included were as strikingly different in their actions on animal organisms as they were similar in structure.
The Saponification And Chlorine Determination Of Alkyl Chlorobenzoates To Determine Their Identity And Purity, Joan Bardele
The Saponification And Chlorine Determination Of Alkyl Chlorobenzoates To Determine Their Identity And Purity, Joan Bardele
Bachelors’ Theses
Many of the present reagents tor the preparation of alcohol derivatives are deficient in at least one respect. A preparative investigation was made by Mr. Robert Johnson of alkyl chlorobenzoates, by substitution of benzoyl chlorides on aloohols, since various benzoyl chlorides are now available commercially. Mr. Johnson presented a thesis on the "Preparation of Alkyl Chlorobenzoates And Their Application As Alcohol Derivatives". As a result or his work thirty eaters previously not reported in literature were prepared and their melting points and boiling points and refractive indices determined.
In order to give an indication of the identity and purity ot …
The Preparation Of Long Chain Secondary Aliphatic Amines, Robert Fay Betts
The Preparation Of Long Chain Secondary Aliphatic Amines, Robert Fay Betts
Bachelors’ Theses
As organic chemistry has always seemed to be the most interesting study to me, I have chosen this particular branch or chemistry for a thesis.
I found through correspondence with some of the larger petroleum companies in the United States that the preparation of long chain secondary amines would constitute a good thesis topic because these compounds have begun to assume importance as additives to lubricating oil.
A Modified Micro Isoteniscope For Measuring Vapor Pressure, Arthur J. Bates
A Modified Micro Isoteniscope For Measuring Vapor Pressure, Arthur J. Bates
Bachelors’ Theses
A survey of literature will show that the vapor pressures of many substances have not been determined. A probable reason tor this lack of available data might be that the instrumentation needed for these measurements have been quite complex and required highly skilled personnel for its performance.
Vapor-pressure measurements are important in all distillation problems and in the calculation of certain other physical properties. They are used in the correction of boiling points and in the recovery of solvents. The concentration of vapor in the gas phase may be regulated effectively by controlling the temperature of the liquid. Humidity conditions, …
Diffusion Through A Membrane, Marvin E. Wyman
Diffusion Through A Membrane, Marvin E. Wyman
Journal of the Minnesota Academy of Science
No abstract provided.
Carbon-Fluorine Chemistry, H. G. Bryce
Carbon-Fluorine Chemistry, H. G. Bryce
Journal of the Minnesota Academy of Science
No abstract provided.
The Inductive Compared With The Deductive Approach To Teaching Secondary School Chemistry, Clarence H. Boeck
The Inductive Compared With The Deductive Approach To Teaching Secondary School Chemistry, Clarence H. Boeck
Journal of the Minnesota Academy of Science
No abstract provided.