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  Partner: UNT Libraries
 Department: Department of Chemistry
 Collection: UNT Theses and Dissertations
Affordances of Instrumentation in General Chemistry Laboratories

Affordances of Instrumentation in General Chemistry Laboratories

Date: August 2010
Creator: Sherman, Kristin Mary Daniels
Description: The purpose of this study is to find out what students in the first chemistry course at the undergraduate level (general chemistry for science majors) know about the affordances of instrumentation used in the general chemistry laboratory and how their knowledge develops over time. Overall, students see the PASCO™ system as a useful and accurate measuring tool for general chemistry labs. They see the probeware as easy to use, portable, and able to interact with computers. Students find that the PASCO™ probeware system is useful in their general chemistry labs, more advanced chemistry labs, and in other science classes, and can be used in a variety of labs done in general chemistry. Students learn the affordances of the probeware through the lab manual, the laboratory teaching assistant, by trial and error, and from each other. The use of probeware systems provides lab instructors the opportunity to focus on the concepts illustrated by experiments and the opportunity to spend time discussing the results. In order to teach effectively, the instructor must know the correct name of the components involved, how to assemble and disassemble it correctly, how to troubleshoot the software, and must be able to replace broken or missing components ...
Contributing Partner: UNT Libraries
Aldohaloketenes and the Stereochemistry of Aldohaloketene Cycloadditions

Aldohaloketenes and the Stereochemistry of Aldohaloketene Cycloadditions

Date: May 1970
Creator: Hoff, Edwin Frank
Description: The objective of this research problem was to synthesize aldohaloketenes and investigate the chemistry of this new class of ketenes.
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Aluminum and Copper Chemical Vapor Deposition on Fluoropolymer Dielectrics and Subsequent Interfacial Interactions

Aluminum and Copper Chemical Vapor Deposition on Fluoropolymer Dielectrics and Subsequent Interfacial Interactions

Date: December 1997
Creator: Sutcliffe, Ronald David
Description: This study is an investigation of the chemical vapor deposition (CVD) of aluminum and copper on fluoropolymer surfaces and the subsequent interfacial interactions.
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Amine Derivatives of 3-chloro-5(8?)-nitro-1,4-naphthoquinone

Amine Derivatives of 3-chloro-5(8?)-nitro-1,4-naphthoquinone

Date: August 1952
Creator: Whitaker, Leroy, 1929-
Description: This work deals with the preparation of amine derivatives of 3-chloro-5(8?)-nitro-1,4-naphthoquinone which are to be tested for anti-tubercular activity by Parke, Davis and Company.
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Amino Acid Complexes of Rhodium(III)

Amino Acid Complexes of Rhodium(III)

Date: August 1965
Creator: Waller, James F.
Description: This thesis will explore and study rhodium, a group VIII element that has rarely been studied.
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a-Amino Alcohol Derivatives of Methyl P-Nitrophenyl Acetate

a-Amino Alcohol Derivatives of Methyl P-Nitrophenyl Acetate

Date: 1947
Creator: Prindle, Hershel B.
Description: This thesis describes the synthesis of a series of dialkylaminoalkoxy derivatives of methyl p-nitrophenylacetate for testing as anti-histamine or hay fever drugs.
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An Analysis of Elementary Science Material Included in Certain Courses of Study and Text Books

An Analysis of Elementary Science Material Included in Certain Courses of Study and Text Books

Date: August 1937
Creator: Maurice, Katherine
Description: The purpose of this study is to assess the contribution of elementary science to the curriculum. The finding of the investigation summarized in table form.
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An analysis of the effectiveness of computer assisted instruction in general chemistry at an urban university.

An analysis of the effectiveness of computer assisted instruction in general chemistry at an urban university.

Date: May 2002
Creator: McGuffey, Angela
Description: The science-major General Chemistry sequence offered at the University of Houston has been investigated with respect to the effectiveness of recent incorporation of various levels of computer technology. As part of this investigation, questionnaire responses, student evaluations and grade averages and distributions from up to the last ten years have been analyzed and compared. Increased use of web-based material is both popular and effective, particularly with respect to providing extra information and supplemental questions. Instructor contact via e-mail is also well-received. Both uses of technology should be encouraged. In contrast, electronic classroom presentation is less popular. While initial use may lead to improved grades and retention, these levels decrease quickly, possibly due to a reduction in instructor spontaneity.
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An Analysis of the Naphtha Cut of Cooke county, Texas, Crude Oil

An Analysis of the Naphtha Cut of Cooke county, Texas, Crude Oil

Date: August 1938
Creator: Jones, Homer
Description: This study attempted to determine hydrocarbons in the crude oil by comparing the results obtained using the two methods of analysis: chemical analysis and Kurtz-Headington analysis. The Kurtz-Headington analysis was found to be adequate to determine hydrocarbons in the crude oil.
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ANTI preference of the pyramidalized radical center to the two fluorines in difluoro cyclic compounds.

ANTI preference of the pyramidalized radical center to the two fluorines in difluoro cyclic compounds.

Date: May 2008
Creator: Tanna, Jigisha
Description: An extensive study of disubstituted cycloalkanes like CnH2n where n=3,4,5 and 6 using DFT((U)B3LYP/6-31G(d) and 6-311+G(2df,2p)) calculations is presented focusing on the effect of pyramidalization of the radical center. A potential energy surface (PES) analysis shows that the radical prefers to pyramidalize anti to the two cis fluorines in the disubstituted cycloalkanes. The degree of pyramidalization for 1,2-difluorocyclopropyl radical is 43.9o away from the cis fluorines whereas for 1,3-difluorocyclobutyl radical, 1,3-difluorocyclopentyl radical and 1,3-difluorocyclohexyl radical is 3.8o, 5.4o and 14.5o respectively away from the cis fluorines. The importance of this pyramidality effect in these compounds is discussed in context with the carbon-hydrogen bond dissociation energies (BDE's) because the preference of the radical centers to pyramidalize anti to the fluorines affects the bond dissociation energy. Importance of steric effect and unfavorable electronic interactions have been extensively explored in planar permethylated cyclobutadiene (Me4CBD) and cyclooctatetraene (Me8COT) using ((U)B3LYP/6-31G(d) and 6-311+G(2df,2p)) calculations. It is thought that steric interactions dominate electronic interactions in Me8COT, while this works opposite in case of Me4CBT. Instead, in Me4CBD the number of unfavorable electronic interactions between π bonds and out-of-plane hydrogens plays the dominant role in determining the relative energies. Interactions between the π bonds of CBD and ...
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