Theoretical Chemistry
Mostrando 25-36 de 134 artigos, teses e dissertações.
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25. Analisando o desenvolvimento profissional de um licenciando em química: relações entre concepções epistemológicas e modelos didáticos
This paper comprises a case study within the scope of Chemistry teacher training that aimed to analyze the process of professional development progression of a future teacher. Therefore, we sought to identify the didactic models present in the Work Plans developed in primary schools by graduate students during supervised training. To do so, Rafael Porlán Ar
Quím. Nova. Publicado em: 2017-02
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26. RECENTES APLICAÇÕES EM SÍNTESE ORGÂNICA DE CATÁLISE FOTO REDOX MEDIADA POR LUZ VISÍVEL
In the past few years, photoredox catalysis has become a powerful tool in the field of organic synthesis. Using this efficient method, it is possible to excite organic compounds from visible light and attain alternative mechanistic pathways for the formation of chemical bonds, a result which is not obtainable by classical methods. The rapid growth of work in
Quím. Nova. Publicado em: 2015-09
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27. FUNDAMENTOS DE ELETROFORESE CAPILAR: UMA ABORDAGEM POR ANIMAÇÕES
Among the analytical separation techniques, capillary electrophoresis (CE) has attracted attention in both academic and industrial fields, mainly owing to its efficiency, short analysis times, low reagent consumption and residue generation. This is also the case in Chemistry courses, books and papers, demonstrating CE´s well-established status. However,
Quím. Nova. Publicado em: 2015-06
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28. BIOORGANIC CONCEPTS INVOLVED IN THE DETERMINATION OF GLUCOSE, CHOLESTEROL AND TRIGLYCERIDES IN PLASMA USING THE ENZYMATIC COLORIMETRIC METHOD
Bioorganic and biological chemistry have been found to be highly motivating to undergraduate students and in this context, biochemical blood parameter analysis emerges as highly attractive content. In this proposal, several aspects related to analyses of glucose, cholesterol and triglycerides using the enzymatic colorimetric method were involved, and the fin
Quím. Nova. Publicado em: 2015-05
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29. ENZYMATIC RESOLUTION OF ANTIDEPRESSANT DRUG PRECURSORS IN AN UNDERGRADUATE LABORATORY
The use of biocatalysts in synthetic chemistry is a conventional methodology for preparing enantiomerically enriched compounds. Despite this fact, the number of experiments in chemical teaching laboratories that demonstrate the potential of enzymes in synthetic organic chemistry is limited. We describe a laboratory experiment in which students synthesized a
Quím. Nova. Publicado em: 2015-02
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30. Propriedades relacionadas à acidez e basicidade a partir da abordagem em química computacional
Analytical Chemistry books lack a clear link between thermodynamic and equilibrium approaches involving acids and bases. In this work, theoretical calculations were performed to search for these relations. An excellent relationship was found between difference in Gibbs free energy, ∆G of acid dissociation reaction and ∆G of hydrolysis reaction of the cor
Quím. Nova. Publicado em: 2014
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31. Uso de diagrama V modificado como relatório em aulas teórico-práticas de química geral
In this article, we present data from a study in practical classes for General Chemistry. To this end, it was proposed to use a modified V diagram to replace traditional reporting. These reports consist of material commonly prepared in the subject, including introduction, materials and methods, results and discussion and conclusions. From the preparation of
Quím. Nova. Publicado em: 2014
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32. Alterações em medicamentos mal acondicionados: uma estratégia para desenvolver habilidades investigativas, comunicação científica e interdisciplinaridade nas aulas de química
The chemist must master a number of abilities. These include a solid knowledge of theory and the capacity to devise theoretical problems. The chemist is also expected to solve problems. In order to improve these abilities, this work aimed to evaluate several tools, such as the use of contextualization, problem-based learning and the interdisciplinary approac
Quím. Nova. Publicado em: 2014
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33. Modulating the electronic structure of amino acids: interaction of model lewis acids with anthranilic acid
On the basis of theoretical B3LYP calculations, Yáñez and co-workers (J. Chem. Theory Comput. 2012, 8, 2293) illustrated that beryllium ions are capable of significantly modulating (changing) the electronic structures of imidazole. In this computational organic chemistry study, the interaction of this β-amino acid and five model Lewis acids (BeF1+, Be2+,
Quím. Nova. Publicado em: 2014
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34. O centenário da molécula de Bohr
A hundred years ago, a twenty-eight year old Danish scientist published a series of three papers in which electron motion was quantized. The Bohr atomic model is surely known by every chemistry student. Nevertheless in this same 1913 trilogy, Bohr studied atoms with several electrons as well as molecules. Chemistry students, in general, are not aware of the
Quím. Nova. Publicado em: 2013
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35. Concepciones sobre ciencia y género en el profesorado de Química: aproximaciones desde un estudio colectivo de casos
The objective of this research was to identify and characterize chemistry teachers´ conceptions about science and gender. The collective case study was carried out in a Teacher Training Workshop in Santiago-Chile City. The data collected included responses to two questionnaires, the teacher speech in workshops, and direct observation of classroom interactio
Ciênc. educ. (Bauru). Publicado em: 2013
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36. Físico-química experimental: uma proposta para abordar equilíbrio de fases em sistemas ternários
On undergraduate courses, practical classes represent periods in which students can verify the concepts presented in theoretical classes. Conversely, the teaching internship in graduate programs allows these students to incorporate pedagogical practices into their experience, predominantly involving observation and reproduction of methods adopted by supervis
Quím. Nova. Publicado em: 2013