ISSN 0187-893X       ISSNE 1870-8404
Sabado, 20 de del 2014

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Guide authors of the current issue Volumen XXV, Número EL, December de 2014 Volumen XXV, Número 4, October de 2014 Volumen XXV, Número 3, July de 2014 Volumen XXV, Número E1, May de 2014
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Papers of the current issue

Analysis of household cleaning product labels to discuss everyday chemistry with students

Luciana Maria de Jesus Baptista Gomes, Luis Gustavo Magro Dionysio, Jorge Cardoso Messeder

Chemistry is present in the daily students life through the use of products at home, such as household cleaning products. Still, it is hard for students to perceive it vividly in their lives, because within syllabi, chemistry is reduced to formulas, names and reactions, opening a gap between school knowledge and their reality. That is why this work describes a demo-investigative activity, conducting analysis of household cleaning product labels, with the goal of helping the student to reaffirm and / or reframe their knowledge about them and their relation to safety, health, environment, science and technology. Conducted in two schools with very different economic realities, there were perceived similarities in the perception of the students and teachers ability to act as mediator between school knowledge and students knowledge so they reframe chemistry in their own lives. KEYWORDS: demo-investigative activity, STS, situated learning

Synthesis of Caffeine from Theobromine: Bringing Back an Old Experiment in a New Setting

Davir González-Calderón, Carlos A. González-González, Aydeé Fuentes-Benítez, Carlos González-Romero

Caffeine is one of the most widely consumed, naturally occurring, mild, central nervous system stimulants. Its synthesis, by the N-methylation (SN2 substitution) of theobromine is described as an experiment for the undergraduate organic chemistry laboratory. The N-methylation of theobromine is rapid and efficient and its progress is monitored by TLC using authentic standards. The undergraduate student also is able to observe the effect of temperature on the rate of the N-methylation reaction. KEYWORDS: caffeine, theobromine, undergraduate organic chemistry laboratory, thin layer chromatography, microscale organic reaction

Virtue, a laudable philosophical paradigm in chemistry education

Jorge Meinguer Ledesma

This manuscript analyzes some aspects of the philosophical paradigm of virtue and how it could thoroughly impact the teaching of chemistry. Specifically, research is done on the relationship the notion of virtue has with ethical and epistemological matters in science education; striving therein to promote refection on chemical content, internal procedures which shape disciplinary research and the role this important science plays in society. In this way, what has been called formation in virtues is presented as a good-natured objective in the current context of chemistry education. KEYWORDS: virtue, ethics, epistemology, chemistry education, dialog

Metallochaperones: Personal escorts on intracellular trafficking of metal ions

María Elena Bravo-Gómez, Adrián Espinoza-Guillén, Silvia E. Castillo-Blum, Noráh Y. Barba-Behrens

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Paul Schtzenberger

Jaime Wisniak

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The great ideas on biodiversity and the Content Representation of a student-teacher. Visit of a professor of Universidad Surcolombiana

Visita de una profesora de la Universidad Surcolombiana

Zully Cuéllar-López, Leiber Rodríguez, Andoni Garritz

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Environmental acceptability factor assessment as suitability criteria in organic chemistry experiments

Irma Cruz Gavilán, José Gustavo Ávila-Zárraga, Nadya I. Birrichaga-Bonilla, Gema Susana Cano-Díaz

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