Conhecimento escolar em química: processo de mediação didática da ciência

xThe aim of this article is to present a contribution of the school knowledge research to Chemistry Teaching. The object of research is school knowledge on physical sciences, considering the existence of a rupture between scientific knowledge and everyday knowledge. The differences between analogies and metaphors and the process of didactic mediation were thoroughly examined. The conclusion is that the process of didactic mediation is built on their own cognitive configurations, which not always make public the private scientific knowledge to certain social groups.

Quimiluminescência orgânica: alguns experimentos de demonstração para a sala de aula

The generation of "cold light", visible to the human eye, by chemical reactions has attracted the attention of the scientific community since the beginning of this century. Besides the academic interest in the elucidation of the mechanisms of excited state formations, many chemiluminescence reactions have found widespread analytical applications. Moreover, the phenomenon of chemiluminescence can also be used as a tool in undergraduate and college teaching. In this article, we describe several known chemiluminescence demonstrations, which are suitable for school teaching. The main objective of this work is to produce didactic material in Portuguese to stimulate Brazilian secondary and high school teachers to use these experiments in the classroom. The demonstrations include singlet oxygen emission, the luminol reaction, oscillating chemiluminescence and the peroxyoxalate reaction.

A proposta curricular de química do Estado de Minas Gerais: fundamentos e pressupostos

This article presents the basic ideas that oriented the elaboration of the new Chemistry Curriculum for the High Schools in the State of Minas Gerais, Brazil. The main features of traditional Brazilian Chemistry Curriculum are critically discussed, namely, the excessive number of concepts, the overemphasis in procedures and rituals instead of chemical principles and the lack of relationship between the concepts and the social, technological and environmental contexts. Trying to overcome these features, the proposed curriculum deals with a fewer number of concepts, clearly related in a conceptual structure, opening space to a balanced emphasis on phenomena, theory and representation, and on conceptual and contextual aspects of chemical knowledge.

Química geral experimental: uma nova abordagem didática

This essay describes a new didactic approach, in according with the national curriculum guidelines for chemistry undergraduate courses in Brazil, employed during the one-semester course "Experimental General Chemistry" for chemistry undergraduate students at the Federal University of Piauí. The new approach has positively helped student's training by improving their reading skills and their understanding of scientific reports, by developing the use of electronic tools to search and to recover the required knowledge for their learning activities, and by improving their skills of understanding published texts and dealing with digital sources. At the same time the students are strongly stimulated to enter the research program for undergraduate students available at the University.

Percepció i coneixements dels estudiants d'infermeria sobre la violència en la parella

Les últimes dades de l'estudi europeu del 2014, sobre la violència de parella indiquen que gairebé 62 milions de dones europees, havien sofert actes de violència de gènere, entre els quals es destaca els relacionats amb la violència de parella (VP). Els maltractaments constitueixen un problema molt greu que genera al nostre país cada vegada més alarma social i més actuacions legals i professionals per fer-li front. El sistema de salut és, amb freqüència, el primer lloc al que les víctimes de violència domèstica acudeixen a la recerca d'assessorament i ajuda, sent aquest el motiu pel qual els professionals de la salut tenen un paper central per a la seva assistència. Aquests formen part implicada en el sistema de detecció, atenció i actuació. Per això, els plans d'estudi de Grau d'Infermeria recullen en el BOE la formació en VP des de l’àmbit universitari. L’objectiu del nostre estudi consisteix en la identificació de la percepció i dels coneixements en relació a la violència de parella dels estudiants del Grau d’Infermeria de la Universitat de Girona durant el curs acadèmic 2012-2013. Per a dur-lo a terme es va realitzar un anàlisi quantitatiu dels resultats a través de l’administració d’una enquesta sobre sis aspectes de la VP, l’enquesta incloïa el perfil demogràfic (sexe, edat i anys d'estudi) dels estudiants i les declaracions relatives a les seves percepcions i coneixements sobre la VP: causes d'abús; la identificació de les dones objecte de VP i del seus autors; creences de les infermeres; funcions perceptibles; i la preparació educativa. Els estudiants del Grau d’Infermeria mostren tenir un bon coneixement sobre les causes del abús en VP, així com una formació adequada. També cal destacar que un 54,42% dels alumnes enquestats es veuen capacitats per afrontar un cas de VP com a infermer/a. S’observa una millora de la formació educativa en el transcurs acadèmic. En 1r curs un 40,09% té una bona formació, aquest valor augmenta fins a un 56,58% a tercer curs, baixant lleugerament fins un 44,27% a 4rt curs. Els resultats obtinguts són semblats a estudis de mostres similars en estudiants d'infermeria de Memphis (EUA) i de la University of Southern Queensland (Austràlia) quant a coneixements i percepció sobre la VP. Encara que els resultats mostren un coneixement i una percepció sobre la VP adequada, destaquem que això no succeeix en gairebé un 40% dels enquestats. La introducció de matèries específiques sobre igualtat i sobre violència contra la dona en els plans d’estudis, pot esdevenir una mesura preventiva per revisar i corregir possibles mites i creences en VP. Per tant, és necessari millorar la formació del currículum en estudiants d'infermeria per la importància d'aquest greu problema de salut pública, donant major èmfasis en la satisfacció de les necessitats emocionals i en la comprensió dels diferents enfocaments en VP, especialment en mesures de prevenció i educació

La metacognición en la escuela : la importancia de enseñar a pensar

The objective of teaching the abilities of the thought one would not have to consider as something opposed to teach the conventional content but as a complement of this. People frequently reason from an inferior to the good one; therefore, they are important to develop methods that allow to improve the thought abilities. The authentic protagonism of the school has to go to help to think the person and to teach to learn. The teacher has to teach learning strategies and it should promote the student’s effort to propitiate the construction of outlines and to facilitate the permanent learning. Finally, one of the current and future high-priority areas in investigation is that of the interventions in strategies metacognitives, their impact in the development cognitive of the students and the transfer and the duration of their effects in the learning

Las redes de innovación docente de la Universitat de Girona : la perspectiva de los coordinadores

In 2009 the University of Girona (Spain) created four interest groups on teaching innovation. The objective of the project is that lecturers with an interest in teaching innovation can exchange their points of view and learn from one another, so University teaching is improved as a result. There are four such groups: “Problem based learning (ABP)”, “Cooperative learning”, “Evaluation”, and “Information and Communication Technologies (ICTs) and Teaching”. The coordinators of the groups or networks, as they are also called, are chosen on a free basis by its members. This paper presents their point of view as regards the current activity of encouragement of interest in higher education and they elaborate on the main difficulties involved. The implications of the interdisciplinary work are explored, as well as the challenges of an initiative of this kind. The evolution of the ongoing work is reviewed, taking into account the context of a changing University, the lack of previous experience regarding projects of this kind, the asynchronous communication among the participants, and the necessity of a flexible approach in organizational matters

Idoneidad didáctica de un protocolo sociocultural de enseñanza y aprendizaje de las matemáticas

En este estudio se evalúa la adecuación de un protocolo para la enseñanza delconcepto de poliedro regular, destinado a alumnos de 14 y 15 años. Este protocolo se ha diseñado desde una perspectiva sociocultural y su evaluación se basa en la aplicación de los criterios deidoneidad didáctica que ofrece el enfoque ontosemiótico. La idoneidad se estudia con la revisión de sus diferentes dimensiones: matemática, cognitiva, interaccional, mediacional, emocional y ecológica. El análisis ha permitido detectar algunos factores que favorecen la validez del protocolo y la adecuación para su empleo en el aula, como el tipo de discurso, el uso de material manipulable o el trabajo cooperativo

O fabrico e uso da pólvora no Brasil colonial: o papel de alpoim na primeira metade do século XVIII

Gunpowder played a significant role in colonial Brazil. This reached a climax in the eighteenth century, when the country's large gold output enticed the greed of many. The French invasion of Rio de Janeiro in 1711 made the city's defense even more pressing to the metropolis. Brigadier Alpoim symbolized this reaction. He was a leading Luso-Brazilian engineer of that century, whose multiple activities set him apart in colonial life. These activities included a pioneer role in teaching the manufacture and use of gunpowder, about which he wrote extensively during the first half of the eighteenth century. His work is thus among the first to treat chemical technology in the colony at such an early age.

Proceso de transformación de las concepciones del profesorado sobre la resolución de problemas matemáticos

The aim of this study is to analyze the transformation of Primary School teachers’ conceptions about mathematical problem solving. We performed a study with 18 teachers from three public schools: in each class (from 1º to 6º) there were two interventions, and we were interviewed teachers before and after them. The results have show identified changes in: 1) teacher’s expectations about students’ abilities; classroom management; perception of diversity; mathematical strategies used by students; communication in the classroom; causes of the problems encountered; and relevance process of problem solving in mathematics teaching. The transformation of teachers’ conceptions is due to the following factors: a) awareness of the practice; b) systematic reflection; c) the contrast between different ways to work solving problems in math class

Aportaciones del área de educación física a la competencia básica "aprender a aprender"

In front of a moment of change in the education, with the entry into force of the LOE (Ley Orgánica de Educación, 2006), the aim of thisarticle is to face the challenge of trying to answer to the need to make concrete learning agreements with the new curriculum based on competences.The present article arises from the interest of being able to offer an approach that facilitates the exposition to show the didactic units from the areaof physical education in relation with the pedagogic principles of the LOE. Departing from this commitment, let’s sense beforehand an offer of thecontributions of the Physical Education to the Basic Competence to learn to learn which entails to develop some capacities in fuction of knowing todo skills

Estudo das relações entre estrutura e atividade de parabenos: uma aula prática

Parabens are p-hydroxybenzoic acid esters widely used as preservatives. With the aim of teaching the structure-activity relationships (SAR) knowledge in a practical form, this paper proposed a practical class to view the SAR of parabens as antimicrobial agents. Methyl, ethyl, n-propyl, isopropyl and isopentyl paraben compounds were synthesized and their respective antimicrobial activities were assessed through determination of minimum inhibitory concentrations (MIC) against Staphylococcus aureus ATCC 25923 and Escherichia coli ATCC 25922 stains. With the MIC values, it was possible to verify theircorrelation with calculated lipophilicity (ClogP). This method can be applied in practical Medicinal Chemistry classes.

Experimento utilizando grãos para explorar a calibração em análises químicas

The conventional curriculum of Analytical Chemistry undergraduate courses emphasizes the introduction of techniques, methods and procedures used for instrumental analysis. All these concepts must be integrated into a sound conceptual framework to allow students to make appropriate decisions. Method calibration is one of the most critical parameters that has to be grasped since most analytical techniques depend on it for quantitative analysis. The conceptual understanding of calibration is not trivial for undergraduate students. External calibration is widely discussed during instrumental analysis courses. However, the understanding of the limitations of external calibration to correct some systematic errors is not directly derived from laboratory examples. The conceptual understanding of other calibration methods (standard addition, matrix matching, and internal standard) is imperative. The aim of this work is to present a simple experiment using grains (beans, corn and chickpeas) to explore different types of calibration methods.

CORROSÃO DO AÇO-CARBONO: UMA ABORDAGEM DO COTIDIANO NO ENSINO DE QUÍMICA

In this paper, two simple ways of evaluating carbon steel sheet corrosion in a hydrochloric acid solution were presented as an experimental proposal for corrosion teaching. The first method is based on direct measurements of mass before and after corrosion tests. The second approach follows the principle of visual colorimetry by which soluble corrosion products are transformed into red complexes allowing monitoring of the products’ concentration according to increases in solution color intensity. Both methods proved able to determine the corrosion rate.

PREPARAÇÃO DE PONTOS DE CARBONO E SUA CARACTERIZAÇÃO ÓPTICA: UM EXPERIMENTO PARA INTRODUZIR NANOCIÊNCIA NA GRADUAÇÃO

Carbon dots (CDs) constitute a new class of carbon-based nanomaterials that measure less than 10 nm and display attractive physical and chemical features such as fluorescence. CDs have been considered the new “power” carbon nanomaterials since their accidental discovery in 2004. This study reports a simple, easy, and accessible experiment for undergraduate courses. The experiment involves the preparation of CDs by pyrolysis using commercial gelatin as a low cost precursor as well as CD purification and optical characterization. The optical properties of CDs such as absorption and emission properties make them a promising material for teaching the basic concepts and techniques used for characterization of nanomaterials. Also, the reactants and final product are suitable for undergraduate courses since they are non-toxic materials. The prepared CDs can be used in such applications as bioimaging, solar cells, and photocatalysis.