The nature of this study was to explore changes in beliefs and lay a foundation for focusing on more specific features of reasoning related to personal epistemological and NOS beliefs in light of specific science laboratory instructional pedagogical practices (e.g., pre- and post- laboratory activities, laboratory work) for future research. This research employed a mixed methodology, foregrounding qualitative data. The total population consisted of 56 students enrolled in several sections of a general chemistry laboratory course, with the qualitative analysis focusing on the in-depth interviews. A quantitative NOS and epistemological beliefs measure was administered pre- and post-instruction. These measures were triangulated with pre-post interviews to assure the rigor of the descriptions generated. Although little quantitative change in NOS was observed from the pre-post NSKS assessment a more noticeable qualitative change was reflected by the participants during their final interviews. The NSKS results: the mean gain scores for the overall score and all dimensions, except for amoral were found to be significant at p < [or] = .05. However there was a more moderate change in the populations' broader epistemological beliefs (EBAPS) which was supported during the final interviews. The EBAPS results: the mean gain scores for the overall score and all dimensions, except for the source of ability to learn were found to be significant at p < [or] = .05. The participants' identified the laboratory work as the most effective instructional feature followed by the post-laboratory activities. The pre-laboratory was identified as being the least effective feature. The participants suggested the laboratory work offered real-life experiences, group discussions, and teamwork which added understanding and meaning to their learning. The post-laboratory was viewed as necessary in tying all the information together and being able to see the bigger picture. What one cannot infer at this point is whether these belief changes and beliefs about laboratory instruction are enduring or whether some participants are simply more adaptable than others are to the learning environment. More research studies are needed to investigate the effects of laboratory instruction on student beliefs and understanding.

Graduate teaching assistants (GTAs) play a prominent role in chemistry laboratory instruction at research based universities. They teach almost all undergraduate chemistry laboratory courses. However, their role in laboratory instruction has often been overlooked in educational research. Interest in chemistry GTAs has been placed on training and their perceived expectations, but less attention has been paid to their experiences or their potential benefits from teaching. This work was designed to investigate GTAs' experiences in and benefits from laboratory instructional environments. This dissertation includes three related studies on GTAs' experiences teaching in general chemistry laboratories. Qualitative methods were used for each study. First, phenomenological analysis was used to explore GTAs' experiences in an expository laboratory program. Post-teaching interviews were the primary data source. GTAs experiences were described in three dimensions: doing, knowing, and transferring. Gains available to GTAs revolved around general teaching skills. However, no gains specifically related to scientific development were found in this laboratory format. Case-study methods were used to explore and illustrate ways GTAs develop a GTA self-image - the way they see themselves as instructors. Two general chemistry laboratory programs that represent two very different instructional frameworks were chosen for the context of this study. The first program used a cooperative project-based approach. The second program used weekly, verification-type activities. End of the semester interviews were collected and served as the primary data source. A follow-up case study of a new cohort of GTAs in the cooperative problem-based laboratory was undertaken to investigate changes in GTAs' self-images over the course of one semester. Pre-semester and post-semester interviews served as the primary data source. Findings suggest that GTAs' construction of their self-image is shaped through the interaction of 1) prior experiences, 2) training, 3) beliefs about the nature of knowledge, 4) beliefs about the nature of laboratory work, and 5) involvement in the laboratory setting. Further GTAs' self-images are malleable and susceptible to change through their laboratory teaching experiences. Overall, this dissertation contributes to chemistry education by providing a model useful for exploring GTAs' development of a self-image in laboratory teaching. This work may assist laboratory instructors and coordinators in reconsidering, when applicable, GTA training and support. This work also holds considerable implications for how teaching experiences are conceptualized as part of the chemistry graduate education experience. Findings suggest that appropriate teaching experiences may contribute towards better preparing graduate students for their journey in becoming scientists.

In Spring 2020, East Tennessee State University, along with colleges and universities around the world, was forced to abruptly transition from face-To-face, on-campus courses to online courses in response to the global COVID-19 pandemic. This contribution reflects on the faculty and student experience of transitioning general chemistry lecture and laboratory to an online format.

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<p>The main purpose of the research this thesis is based upon was to study students’ attitudes towards learning chemistry at university level and their motivation from three perspectives. How can students’ attitudes towards learning chemistry be assessed? How can these attitudes be changed? How are learning situations experienced by students with different attitude positions?</p><p>An attitude questionnaire, assessing views of knowledge, learning assessments, laboratory activities, and perceived roles of instructors and student, was used to estimate students’ attitude positions. It was shown that a positive attitude was related to motivated student behaviour. Furthermore, it was shown that factors in the educational context, such as the teachers’ empathy for students learning chemistry, had affected the students. It was also found that students holding different attitude positions showed different learning outcomes and differed in their perceptions of the learning situation. Students’ holding a more relativistic attitude more readily accepted the challenges of open experiments and other more demanding tasks than those holding a dualistic attitude.</p><p>In addition, the teachers were found to play important roles in the way the tasks were perceived and the development of students’ ideas. In studied laboratory activities open tasks resulted in positive student engagement and learning outcomes. Preparative exercises, such as a computer simulation of the phenomena to be investigated, affected students’ focus during laboratory work, encouraging them to incorporate more theoretical considerations and increasing their ability to use chemical knowledge. Finally, it was shown that students’ focus during laboratory work is reflected in the questions they ask the teacher, implying that questions could be used as tools to evaluate laboratory teaching and learning processes.</p><p>The findings imply that students’ attitudes towards learning and motivation, and the design of learning situations, are key factors in the attainment of desirable higher educational goals such as the ability to judge, use, and develop knowledge. For universities encountering students with increasingly diverse attitudes, motivation and prior knowledge, these are important considerations if they are to fulfil their commissions to provide high quality learning environments and promote high quality learning.</p>

The main purpose of the research this thesis is based upon was to study students’ attitudes towards learning chemistry at university level and their motivation from three perspectives. How can students’ attitudes towards learning chemistry be assessed? How can these attitudes be changed? How are learning situations experienced by students with different attitude positions? An attitude questionnaire, assessing views of knowledge, learning assessments, laboratory activities, and perceived roles of instructors and student, was used to estimate students’ attitude positions. It was shown that a positive attitude was related to motivated student behaviour. Furthermore, it was shown that factors in the educational context, such as the teachers’ empathy for students learning chemistry, had affected the students. It was also found that students holding different attitude positions showed different learning outcomes and differed in their perceptions of the learning situation. Students’ holding a more relativistic attitude more readily accepted the challenges of open experiments and other more demanding tasks than those holding a dualistic attitude. In addition, the teachers were found to play important roles in the way the tasks were perceived and the development of students’ ideas. In studied laboratory activities open tasks resulted in positive student engagement and learning outcomes. Preparative exercises, such as a computer simulation of the phenomena to be investigated, affected students’ focus during laboratory work, encouraging them to incorporate more theoretical considerations and increasing their ability to use chemical knowledge. Finally, it was shown that students’ focus during laboratory work is reflected in the questions they ask the teacher, implying that questions could be used as tools to evaluate laboratory teaching and learning processes. The findings imply that students’ attitudes towards learning and motivation, and the design of learning situations, are key factors in the attainment of desirable higher educational goals such as the ability to judge, use, and develop knowledge. For universities encountering students with increasingly diverse attitudes, motivation and prior knowledge, these are important considerations if they are to fulfil their commissions to provide high quality learning environments and promote high quality learning.

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No description available.

Synthesis of d10 complexes of monovalent coinage metals, copper(I) and gold(I), with dithiophosphinate/diphosphine ligands -- along with their targeted characterization and screening for inorganic or organic light emitting diodes (LEDs or OLEDs, respectively) -- represents the main scope of this dissertation's scientific contribution in inorganic and materials chemistry. Photophysical studies were undertaken to quantify the phosphorescence properties of the materials in the functional forms required for LEDs or OLEDs. Computational studies were done to gain insights into the assignment of the phosphorescent emission peaks observed. The gold(I) dinuclear complexes studied would be candidates of OLED/LED devices due to room temperature phosphorescence, visible absorption/excitation bands, and low single-digit lifetimes -- which would promote higher quantum yield at higher voltages in devices with concomitant lower roll-off efficiency. The copper(I) complexes were not suited to the OLED/LED applications but can be used for thermosensing materials. Crystallographic studies were carried to elucidate coefficients of thermal expansion of the crystal unit cell for additional usage in materials applications besides optoelectronic devices. This has uncovered yet another unplanned potential application for both copper(I) and gold(I) complexes herein, as both types have been found to surpass the literature's threshold for "colossal" thermal expansion coefficients. Two other investigations represent contribution to the field of chemistry education have also been accounted for in this dissertation. First, a 12-week advanced research discovery experiment for inorganic chemistry has been designed to help students develop application-based content expertise, as well as to introduce students to research experiences that are similar to those found in academia, industry, and government research laboratories. Students are expected to develop a novel research project through conducting a literature search to find suitable reaction protocols, incorporating synthetic techniques, collecting data, characterizing products and applications of those products, and presenting their results. This multi-week research discovery experiment is centered on applications of inorganic synthetic techniques to design, analyze, and screen d10 coinage metal complexes for possible LED/OLED-based applications that were presented in chapter 3 of the dissertation. The second chemistry education contribution pertains to designing a pilot research study to investigate undergraduate chemistry majors' perceptions of environmental sources/influences, self-efficacy, outcome expectations, career interests, and career choice goals in the lab designed in chapter 4 of the dissertation. Specifically, this research aims to gauge students' perceptions of their ability to perform synthetic and analytical methods for the creation of materials that were used in a novel research experiment in the context of an inorganic chemistry laboratory. This research study used a survey to collect data on students' motivation, self-efficacy, career interests, and career goals upon graduation, along with their perceived barriers within the course. This research study is guided by the following research question: How does an inorganic chemistry laboratory course, following a research discovery model, impact undergraduate students' (a) confidence with techniques and skills, (b) perception of ability to conduct research, and (c) interest in pursuing careers involving chemistry?