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Turmeric and RGB analysis: A low-cost experiment for teaching acid-base equilibria at home
(American Chemical Society, 2021-01)
An experimental approach to chemistry is a more meaningful way to learn than the use of textbooks alone. Working in the laboratory helps students understand basic concepts through their active engagement. Here, we present ...
Another Twist of the Foam: An Effective Test Considering a Quantitative Approach to "elephant's Toothpaste"
(American Chemical Society, 2017-07)
In this work, a new quantitative look at the well-known "Elephant´s Toothpaste" demonstration is proposed. The catalyzed decomposition of H2O2 by iodide ion (I-) is employed to produce foam in a controlled fashion. The ...
Glowing-in-the-Screen: Teaching Fluorescence with a Homemade Accessible Setup
(American Chemical Society, 2021-07)
Teaching fluorescence aims to deeply communicate light-matter interactions. The main fluorescence concepts are covered in undergraduate courses and are difficult to comprehend as the proper lighting conditions for seeing ...
Scrambled Eggs or How Eggshells Become Phosphates
(American Chemical Society, 2019-06)
As part of the training activities planned for the Chemical Engineering degree, in 2016, a group of students from the Chemical Engineering Laboratory course was challenged to face a plausible reuse of discarded eggshells. ...
Have Biofuel, Will Travel: A Colorful Experiment and a Different Approach To Teach the Undergraduate Laboratory
(AMER CHEMICAL SOC, 2011)
The substitution of petroleum-based fuels with those from renewable sources has gained momentum worldwide. A UV-vis experiment for the quantitative analysis of biofuels (bioethanol or biodiesel) in (petroleum-based) diesel ...
Unimolecular nucleophilic substitution (S N 1): Structural reactivity evidenced by colored acid-base indicators
(American Chemical Society, 2018-10)
The different reactivities between 1°, 2°, and 3° butyl chlorides by the unimolecular nucleophilic substitution (S N 1) mechanism were easily observed at 60 °C by a solvolysis reaction in ethanol with ether formation. The ...
Exploring the Gel State: Optical Determination of Gelation Times and Transport Properties of Gels with an Inexpensive 3D-Printed Spectrophotometer
(American Chemical Society, 2019-01)
The study of gels and their properties is a compelling topic both technologically and scientifically, and should therefore be emphasized in chemistry and material science syllabuses. In the present laboratory experiment, ...
Exploring chemical kinetics at home in times of pandemic: Following the bleaching of food dye allura red using a smartphone
(American Chemical Society, 2021-05-12)
In this communication, a remote experimental activity in chemical kinetics is described, taking into account the quantification based on the optical sensor of a smartphone. The objective pursued herein is to equip students ...
Thermodynamics of sodium dodecyl sulfate (SDS) micellization: An undergraduate laboratory experiment
(American Chemical Society, 2011-05)
An undergraduate laboratory experiment is presented that allows a thermodynamic characterization of micelle formation of sodium dodecyl sulfate (SDS) in aqueous solutions. The critical micelle concentration (CMC) and the ...