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Creating and Experimenting with a Low-Cost, Rugged System to Visually Demonstrate the Vapor Pressure of Liquids as a Function of Temperature
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Papai, Rodrigo; Romano, Majara Araujo; Arroyo, Aline Rodrigues; Rodrigues da Silva, Bárbara; Tresoldi, Bruno; Winter, Gabriela Cabo; Costa, Julia Messias; Freitas Santos, Maria Aparecida; Prata, Matheus Damasceno; Gaubeur, Ivanise – Journal of Chemical Education, 2019
A creative apparatus for use in a hands-on laboratory experiment that allows the visualization of the vapor pressure as a function of temperature is described in this paper. Inspired by homemade barometers and using simple materials that are easily accessible for teaching laboratories, a lowcost system for the establishment of the vapor-pressure…
Descriptors: Physics, Chemistry, Laboratory Experiments, Science Experiments
Approaching Diesel Fuel Quality in Chemistry Lab Classes: Undergraduate Student's Achievements on Determination of Biodiesel Content in Diesel Oil Applying Solvatochromic Effect
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Cavalcante dos Santos, Rafael; Cavalcanti, Juliane Natalizi Cabral; Werneck do Carmo, Elisa Carneiro; de Souza, Fernando Costa; Soares, Wesley Garcia; de Souza, Cristiane Gimenes; de Andrade, Débora França; d'Avila, Luiz Antonio – Journal of Chemical Education, 2020
An experimental procedure is presented that was developed by fifth-year chemical engineering and industrial chemistry undergraduates at the Federal University of Rio de Janeiro doing the discipline on Experimental Organic Technology. The aim of this study was to apply the solvatochromic effect of the dye Nile Blue chloride to the characterization…
Descriptors: Science Instruction, College Science, Undergraduate Study, Chemistry
Determination of Titratable Acidity in Wine Using Potentiometric, Conductometric, and Photometric Methods
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Volmer, Dietrich A.; Curbani, Luana; Parker, Timothy A.; Garcia, Jennifer; Schultz, Linda D.; Borges, Endler Marcel – Journal of Chemical Education, 2017
This experiment describes a simple protocol for teaching acid-base titrations using potentiometry, conductivity, and/or photometry to determine end points without an added indicator. The chosen example examines the titratable acidity of a red wine with NaOH. Wines contain anthocyanins, the colors of which change with pH. Importantly, at the…
Descriptors: Biotechnology, Teaching Methods, Food, Chemistry
Ciênsação: Gaining a Feeling for Sciences
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de Oliveira, Marcos Henrique Abreu; Fischer, Robert – Physics Education, 2017
Ciênsação, an open online repository for hands-on experiments, has been developed to convince teachers in Latin America that science is best experienced first hand. Permitting students to experiment autonomously in small groups can be a challenging endeavour for educators in these countries. We analyse the reasons that cause hesitation of teachers…
Descriptors: Science Experiments, Hands on Science, Science Course Improvement Projects, Student Research
Annatto Polymeric Microparticles: Natural Product Encapsulation by the Emulsion-Solvent Evaporation Method
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Teixeira, Zaine; Duran, Nelson; Guterres, Silvia S. – Journal of Chemical Education, 2008
In this experiment, the extract from annatto seeds was encapsulated in poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBV) particles by the emulsion-solvent evaporation method. The particles were washed and centrifuged to remove excess stabilizer and then freeze-dried. The main compound of annatto seeds, bixin, has antioxidant properties as well…
Descriptors: Research Methodology, Chemistry, Scientific Concepts, Hands on Science
Hands-On Teaching and Entrepreneurship Development.
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da Silveira, Marcos Azevedo; da Silva, Mauro Schwanke; Kelber, Christian R.; de Freitas, Manuel R. – 1998
This paper presents the experiment being conducted in the Electric Circuits II course (ELE1103) at PUC-Rio's Electrical Engineering Department since March 1997. This experiment was held in both the fall and the spring semesters of 1997. The basis for the experiment was concurrent teaching methodology, to which the principles of entrepreneurship…
Descriptors: Electric Circuits, Entrepreneurship, Foreign Countries, Hands on Science