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Cíle Hlavním cílem této disertační práce je nalézt vhodnou formu prezentací určených pro výuku tak, aby žáci při výuce doplněné prezentacemi byli aktivně zapojeni do výuky a spolupodíleli se na tvorbě znalostí, vědomostí a dovedností z oblasti obecné chemie. Součástí hlavního cíle práce je dále vytvořit soubor prezentací zahrnujících učivo obecné chemie pro střední školy tak, aby žáci byli schopni získané znalosti, vědomosti a dovednosti využívat ve studiu dalších oblastí chemie. Metody Při tvorbě prezentací jsme vycházely především ze zásady maximálního využití grafických a názorných prvků, tedy obrázků, schémat, fotografií, animací, grafů a tabulek. Dále jsme se snažily o dodržení zásad týkajících se barevnosti a typů písma (např. velikost písma minimálně 20 bodů, používání bezpatkového písma atd.) Dalším podkladem při tvorbě prezentací byla podrobná rešeršní práce. Vycházely jsme jednak z výzkumů, které se zabývají přímo ověřováním efektivity a dopadů prezentací na edukační proces [1, 2, 3, 4] , ale také z prací, které se věnují vlivu grafiky na proces učení a porozumění [4, 5]. V další fázi byli vyzváni učitelé, kteří měli zájem začlenit prezentace do výuky, aby se zúčastnili semináře, ve kterém jim byly tyto prezentace představeny a byly jim zodpovězeny dotazy, které se týkaly práce s prezentacemi ve...

Podcasts covering essential first-semester general chemistry laboratory techniques and central concepts that aid in experimental design or data processing were prepared and made available for students to access on an as-needed basis on iPhones- or iPod touches-. Research focused in three areas: the extent of podcast usage, the numbers and types of interactions between instructors and research teams, and student performance on graded assignments. Data analysis indicates that the podcast treatment research teams accessed a podcast 2.86 times on average during each week that podcasts were available. Comparison of interaction data for the lecture treatment research teams and podcast treatment research teams reveals that interactions with instructors were statistically significantly fewer for teams that had podcast access rather than a pre‐laboratory lecture. The implication of the results is that student research teams were able to gather laboratory information more effectively when it was presented in an on-demand podcast format. Finally, statistical analysis of data on student performance on graded assignments indicates no significant differences between outcome measures for the treatment groups when compared as cohorts. The only statistically significant difference is between students judged to be highly motivated; for this sub‐group the students in the podcast treatment group earned a course average that was statistically significantly higher than those in the lecture treatment group. This research study provides some of the first data collected on the effectiveness of podcasts delivered as needed in a first-semester general chemistry laboratory setting.

By analyzing electronical tools, online applications and tutorials from Czech Republic and abroad I have come to the conclusion that it is necessary to create a flexible educational instrument which includes digitized chemical experiments for general chemistry. Following the analysis of present databases, CD ROMs and VHS containing pictured experiments I found out that a lot of spectacular experiments with pyrotechnical components have not been shooted at all or not in the range of "greater" chemicals quantity. The chosen programming language, in which FMDP was written, proved to be most efficient. This choice emerged from a discussion with programmers and was motivated in particular by larger possibilities of C# than HTML have. In addition to it the modification of the FMDP content is easy. The teachers with minimum of the PC-literacy can make any changes in FMDP, alternate any of its parts and adapt them for various internal and external conditions of education. With regard to the interview having found the needs of learners I filmed and digitized especially such experiments that present the chemical reactions accompanied by the rise of a smoke, light emission, explosion and a surprising turn of colours. On the basis of the statistical evaluation of statistical data containing marks achieved by...

O presente trabalho recorre à Filosofia da Química como viés para investigar o processo de ensino-aprendizagem em duas disciplinas de Química Geral em um curso para formação de químicos. A investigação se baseou em diversas fontes: respostas dos estudantes via questionários, gravações de aulas, atividade dos estudantes em aula, resposta esperada pelo professor para essa atividade e entrevistas com professores das disciplinas, a fim de possibilitar a triangulação dos resultados. Procurou-se caracterizar a preferência dos estudantes e professores acerca dos tipos de teorias e evidências utilizadas em suas explicações. As teorias hipotéticas e as evidências experimentais mediadas por instrumentos analíticos, como o espectrofotômetro, foram preferidas pelos professores, mas os estudantes mostraram dificuldades em lidar com elas neste momento inicial de sua formação superior. Foi percebida, também, uma tensão subjacente entre a química das moléculas e a química das substâncias, cuja relação está internalizada pelos professores mas não pelos alunos, e que se reflete em suas escolhas pelos tipos de explicações. Essa tensão pode ser entendida a partir da relação entre fazer química (baseado fortemente em instrumentos para separação e caracterização de compostos, e nas teorias que descrevem a química das moléculas) e ensinar química em uma disciplina introdutória (como escolher conteúdos e abordagens que permitam entender a relação entre o nível fenomenológico macroscópico e os modelos explicativos submicroscópicos). Para o químico em formação, observar uma evidência experimental e relacioná-la com uma teoria que envolve entidades submicroscópicas para formar uma explicação é um processo muito complexo. Esse processo fica ainda mais complexo quando a evidência a ser utilizada é mediada por um instrumento. Assim, os resultados obtidos e apresentados nesta tese apontam para a questão de que a diferença entre os tipos de evidências experimentais (mediadas e não mediadas) não pode ser tratada como um conhecimento tácito no ensino superior de Química Geral. / This thesis takes the philosophy of chemistry as a guide to investigate the process of teaching and learning in two general chemistry disciplines in a training course for chemists. In order to enable triangulation of results, the study relied on several sources: students\' responses to questionnaires, recording of classes, classroom students\' activities, expected responses by the lecturer for activities, and interviews with the lecturers. The investigation sought to characterize the preferences of students and lecturers about the kinds of theories and evidences used in their explanations. Lecturers preferred hypothetical theories and experimental evidences mediated by analytical instruments such as the spectrophotometer. However, students showed difficulties in dealing with such theories and mediated evidences in this initial stage of their education. A subjacent tension between the chemistry of molecules and the chemistry of substances, whose relation is internalized by the lecturers but not by the students, was also reflected in their choices for the types of explanations. Such tension can be understood considering the relationship between making chemistry (which is strongly based on instruments for separation and characterization of compounds, and on theories which describe the behavior of molecules) and teaching chemistry on an introductory course (which requires the choosing of contents and approaches to describe the relationship between the macroscopic phenomenological level and the submicroscopic explanatory models). For a chemistry undergraduate, observing an experimental evidence and relating it to a theory which involves submicroscopic entities to form an explanation is a very complex process. This process becomes even more complex when the evidence to be used is mediated by instruments. Thus, the results obtained and presented in this thesis point to the issue that the difference between the types of experimental evidences (direct or mediated) cannot be treated as a tacit knowledge in a General Chemistry university course.

Made available in DSpace on 2014-12-17T15:42:08Z (GMT). No. of bitstreams: 1 CarlosNSJ_TESE.pdf: 2390802 bytes, checksum: fd689c5c883f1493f470eac59ad5f18d (MD5) Previous issue date: 2010-07-08 / The area of Education in Chemistry in Brazil has appeared over 30 years and its growth has been accelerated by the need of comprehension of the processes of teaching and learning in chemistry. Many researches, in this area, has among its investigation objects the teaching tools like teaching materials and the learning processes of students in high school and basic education, but when dealing with higher levels of education, they are seldom portrayed. This study aimed to investigate the General Chemistry textbooks with respect to approach the concept of energy; know the main ideas of graduate students in Chemistry on the relation of the concept of energy and chemical transformations; finally, developing a cicle of studies with the proposition of an approach wich inter-relate the concept of energy and its implications in the teaching-learning process of a chemical transformation. To do so, we used as instruments a questionnaire, press conference, conceptual map and experimental activities. All activities of the study cicle were videotaped and recorded, transcribed and the results organized in tables. For the activities of the study cicle texts that have been developed and inter-relating concepts of chemistry and energy, which in turn gave theoretical support to the activities in the cycle. In the analysis it was used as a theoretical content the analysis of Laurence Bardin. The results revealed that the analysis of the book might be perceived that not always the concept of energy is used in order to generate the abstract thought of chemical transformations, but that the main macroscopic thermodynamic variables are present in the explanation of these transformations. During the study cicle, were studied two chemical reactions: the first one, made possible to approach the macroscopic dimension to quantify the concept of energy and the second one, made possible to demonstrate the macro and microscopic dimension of the concept of energy during a chemical transformation. In all reactions proposed, students used, in most of the times, as explanations, only macroscopic observations of the reactions under study and failed to realize that the concept of energy can be used to explain macro and microscopic chemical transformation. As a final action of the study cicle, students requested further discussion, to clarify the link between the concept of energy and the meanings constructed in the process of studying the reactions. This is done through an oral explanation, during the cycle, and registered in this thesis and attempts to show the interrelationship existing conceptual / A ?rea de Educa??o em Qu?mica no Brasil surgiu h? pouco mais de 30 anos e tem seu crescimento acelerado pela necessidade de compreens?o dos processos de ensino-aprendizagem na qu?mica. Muitas pesquisas, nessa ?rea, t?m entre seus objetos de investiga??o as ferramentas de ensino tais como materiais did?ticos e os processos de aprendizagem de estudantes do n?vel m?dio e fundamental de ensino, mas ao tratar do n?vel superior de ensino, estes ainda s?o pouco retratados. Este trabalho teve como objetivos investigar os livros de Qu?mica Geral com rela??o a abordagem do conceito de energia; conhecer as principais concep??es dos estudantes de gradua??o em Qu?mica sobre a rela??o do conceito de energia e as transforma??es qu?micas; por fim, a elabora??o de um ciclo de estudos com a proposi??o de uma abordagem que inter-relacione o conceito de energia e suas implica??es no processo de ensino-aprendizagem de uma transforma??o qu?mica. Para tanto, utilizou-se como instrumentos o question?rio, entrevista coletiva, mapa conceitual e atividades experimentais. Todas as atividades do ciclo de estudo foram filmadas e gravadas, posteriormente, transcritas e os resultados organizados em tabelas. Para as atividades do ciclo de estudos foram elaborados textos que inter-relacionam os conceitos qu?micos e a energia, que por sua vez, deram suporte te?rico as atividades no ciclo. Na an?lise utilizou-se como referencial te?rico a an?lise de conte?do de Laurence Bardin. Os resultados revelaram que na an?lise do livro p?de-se perceber que nem sempre o conceito de energia ? utilizado no intuito de gerar o pensamento abstrato das transforma??es qu?micas, mas que as principais vari?veis macrosc?picas termodin?micas se encontram presentes na explica??o dessas transforma??es. Durante o ciclo de estudo foram estudadas duas rea??es qu?micas, uma que possibilitasse abordar a dimens?o macrosc?pica de quantifica??o do conceito de energia e outra que demonstrasse a dimens?o macro e microsc?pica do conceito de energia em meio a uma transforma??o qu?mica. Em todas as rea??es propostas os alunos utilizaram, na maioria das vezes, como explica??es, apenas observa??es macrosc?picas das rea??es em estudo e n?o conseguiram perceber que o conceito de energia pode ser utilizado para explicar microscopicamente uma transforma??o qu?mica. Como a??o final do ciclo de estudos, os alunos solicitaram uma discuss?o mais profunda, que esclarecesse a liga??o entre o conceito de energia e os significados constru?dos no processo de estudo das rea??es. Isso ? feito por meio de 8 uma explica??o oral, durante o ciclo, e registrado nesta tese, procurando mostrar a inter-rela??o conceitual existente

O presente trabalho recorre à Filosofia da Química como viés para investigar o processo de ensino-aprendizagem em duas disciplinas de Química Geral em um curso para formação de químicos. A investigação se baseou em diversas fontes: respostas dos estudantes via questionários, gravações de aulas, atividade dos estudantes em aula, resposta esperada pelo professor para essa atividade e entrevistas com professores das disciplinas, a fim de possibilitar a triangulação dos resultados. Procurou-se caracterizar a preferência dos estudantes e professores acerca dos tipos de teorias e evidências utilizadas em suas explicações. As teorias hipotéticas e as evidências experimentais mediadas por instrumentos analíticos, como o espectrofotômetro, foram preferidas pelos professores, mas os estudantes mostraram dificuldades em lidar com elas neste momento inicial de sua formação superior. Foi percebida, também, uma tensão subjacente entre a química das moléculas e a química das substâncias, cuja relação está internalizada pelos professores mas não pelos alunos, e que se reflete em suas escolhas pelos tipos de explicações. Essa tensão pode ser entendida a partir da relação entre fazer química (baseado fortemente em instrumentos para separação e caracterização de compostos, e nas teorias que descrevem a química das moléculas) e ensinar química em uma disciplina introdutória (como escolher conteúdos e abordagens que permitam entender a relação entre o nível fenomenológico macroscópico e os modelos explicativos submicroscópicos). Para o químico em formação, observar uma evidência experimental e relacioná-la com uma teoria que envolve entidades submicroscópicas para formar uma explicação é um processo muito complexo. Esse processo fica ainda mais complexo quando a evidência a ser utilizada é mediada por um instrumento. Assim, os resultados obtidos e apresentados nesta tese apontam para a questão de que a diferença entre os tipos de evidências experimentais (mediadas e não mediadas) não pode ser tratada como um conhecimento tácito no ensino superior de Química Geral. / This thesis takes the philosophy of chemistry as a guide to investigate the process of teaching and learning in two general chemistry disciplines in a training course for chemists. In order to enable triangulation of results, the study relied on several sources: students\' responses to questionnaires, recording of classes, classroom students\' activities, expected responses by the lecturer for activities, and interviews with the lecturers. The investigation sought to characterize the preferences of students and lecturers about the kinds of theories and evidences used in their explanations. Lecturers preferred hypothetical theories and experimental evidences mediated by analytical instruments such as the spectrophotometer. However, students showed difficulties in dealing with such theories and mediated evidences in this initial stage of their education. A subjacent tension between the chemistry of molecules and the chemistry of substances, whose relation is internalized by the lecturers but not by the students, was also reflected in their choices for the types of explanations. Such tension can be understood considering the relationship between making chemistry (which is strongly based on instruments for separation and characterization of compounds, and on theories which describe the behavior of molecules) and teaching chemistry on an introductory course (which requires the choosing of contents and approaches to describe the relationship between the macroscopic phenomenological level and the submicroscopic explanatory models). For a chemistry undergraduate, observing an experimental evidence and relating it to a theory which involves submicroscopic entities to form an explanation is a very complex process. This process becomes even more complex when the evidence to be used is mediated by instruments. Thus, the results obtained and presented in this thesis point to the issue that the difference between the types of experimental evidences (direct or mediated) cannot be treated as a tacit knowledge in a General Chemistry university course.

This study is based on survey responses of 224 general chemistry instructors at United States (U.S.) community colleges and universities representing 46 states. The mean values of General Chemistry Topic Coverage (GCTC) score, developed by this researcher specifically for this dissertation study as a measure of course content, were statistically analyzed. The aim of this study is to answer five research questions: (a) Is there a difference in mean GCTC scores between U.S. community colleges and four-year colleges and universities? (b) If there is a difference in mean GCTC score between the two study groups, what are the observed differences in subtopics covered between community colleges and four-year colleges and universities? (c) Considering both community colleges and universities, is there a difference in mean GCTC score between the different designated U.S. regions? (d) Considering both community college and university professors, is there a difference in GCTC score for professors with a master's degree compared to those with a doctorate?, and (e) Is there a correlation between GCTC score and the percentage of students that major in science? Results indicate that there is a statistically significant difference in course content between community colleges and universities, there is a statistically significant difference between different U.S. regions, there is no statistically significant difference between professors with an earned master's versus those with an earned doctorate degree, and there is no statistically significant correlation between general chemistry course content and the percentage of a professor's students majoring in science. Details of the observed differences between community college and university course content are discussed, and recommendations for future research are presented.

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 quickly. The use of podcasts or Web-based videos should increase student understanding of affordances of the probeware.

and keywords Acid-base process PowerPoint presentation for secondary schools Abstract: At the present time, the requirements for the quality of nature sciences education in secondary schools are steadily increasing. However, the time approbation for teaching is relatively limited. Using presentations is going to be a possible way to increase the effectiveness of educational process and to take the full advantage of teaching methods which have positive effect on the motivation and activation of students. The goal of this Diploma work is to create a collection of teaching presentations in the MS PowerPoint application with a view to a part of general chemistry, i.e. the theme Acid-base process in the curriculum for four-year grammar schools or alternatively for higher years of longer grammar schools. These presentations are processed to be used in the real chemistry lessons in secondary schools. The subject matter of the curriculum is divided into five chapters, one chapter corresponds to one presentation. In order to facilitate the orientation of potential user every presentation is provided with an accompanying text. The electronic version of presentations is attached to Diploma work. Keywords: secondary school chemistry, general chemistry, acid-base process, student motivation, PowerPoint presentation