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Showing 1 to 15 of 101 results Save | Export
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Costa, Samuel C.; Fernandes, Julio C. B. – Journal of Chemical Education, 2019
We developed a simple device to teach the concept of pH to visually impaired people through an experimental approach. An interface between a glass electrode and an open-source electronics platform based on easy-to-use hardware and software (Arduino Uno) was designed using an operational amplifier of ultralow input current. A headphone connected to…
Descriptors: Science Instruction, Scientific Concepts, Visual Impairments, Teaching Methods
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Suroviec, Alice H.; Jones, Katarina; Sarabia, Grace – Journal of Chemical Education, 2019
Flavonoids have been studied extensively for their antioxidant properties. Specifically, the flavonoids in tea, such as catechin and epigallocatechin gallate, have been shown to have positive health effects. These compounds are also oxidizable, so the concentrations of these compounds in a given kind of tea can be determined using cyclic…
Descriptors: Science Instruction, Chemistry, Food, Hands on Science
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Schneider, Elia M.; Bärtsch, Amadeus; Stark, Wendelin J.; Grass, Robert N. – Journal of Chemical Education, 2019
A simple synthesis of fluorescent carbon quantum dots from lemon juice is described to introduce advanced high-school students and undergraduate college students to nanoparticle synthesis and quantum dots. The synthesis is based on the carbonization of lemon juice using only a hot plate stirrer. Column chromatography is used to separate different…
Descriptors: Science Instruction, Teaching Methods, High School Students, Foreign Countries
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Njoki, Peter N. – Journal of Chemical Education, 2019
A laboratory experiment has been developed to illustrate the transformation of silver nanoparticles (Ag NPs) in water containing phosphate anions. The experiment, conducted by high school students, involved hands-on learning to synthesize and characterize Ag NPs via ultraviolet-visible (UV-vis) spectroscopy. This was followed by a UV-vis probe of…
Descriptors: High School Students, Science Experiments, Chemistry, Science Instruction
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Morales, Christine; Chen, Franklin – Journal of Chemical Education, 2019
The effects of substitution on reaction rates are at the heart of both physical chemistry and organic chemistry. In this paper, we present a computational laboratory module to explore the effects of group substitution and isotopic substitution on reaction rates by using a readily accessible graphical interface, a computational engine, and…
Descriptors: Science Instruction, Chemistry, Science Laboratories, Computation
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Peng, Zhe; Jimenez, Jose L. – Journal of Chemical Education, 2019
KinSim is a research-grade, interactive, user-friendly, open-source, and visual software for kinetics modeling of environmental chemistry and other applications. Students without any computer-programming background and limited knowledge of environmental chemistry can use KinSim, which also includes multiple features and functionality dedicated to…
Descriptors: Chemistry, Science Instruction, Kinetics, Environmental Education
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Sattar, Simeen – Journal of Chemical Education, 2019
Pigments, dyes, and transition-metal compounds are made in courses across the undergraduate chemistry curriculum, but student characterization of these compounds' most striking features, their colors, seldom goes beyond verbal descriptions. Affordable, hand-held, fiber-optic reflectance spectrophotometers make it possible to advance students'…
Descriptors: Chemistry, Science Instruction, Undergraduate Students, Color
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O'Donoghue, J. – Journal of Chemical Education, 2019
This work describes the design, building, and testing of miniature, low-cost LED-LDR colorimeters for absorption-spectrophotometry experiments. It also describes using these colorimeters for simplified context-based-learning (CBL) activities in school teaching laboratories and for public-engagement events. The colorimeters are simple and robust,…
Descriptors: Cost Effectiveness, Chemistry, Science Instruction, Spectroscopy
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Duangpummet, Prempree; Chaiyen, Pimchai; Chenprakhon, Pirom – Journal of Chemical Education, 2019
An inquiry-based laboratory learning unit was designed to enhance high school students' understanding of the application of lipase as a catalyst to synthesize isoamyl and geranyl ester derivatives as well as to promote their understanding and positive perceptions of green chemistry. The learning unit consisted of three laboratories and a final…
Descriptors: Science Laboratories, Secondary School Science, High Schools, Chemistry
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Enneking, Kory M.; Breitenstein, Graham R.; Coleman, Amelia F.; Reeves, James H.; Wang, Yishi; Grove, Nathaniel P. – Journal of Chemical Education, 2019
The laboratory has occupied an important place in the general chemistry curriculum for well over a century, despite the fact that many have voiced concern about its value and utility. In an effort to potentially increase capacity in our general chemistry courses, we developed and implemented a hybrid laboratory curriculum that consisted of…
Descriptors: Science Laboratories, Chemistry, Science Instruction, College Science
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da Silva, Rodrigo Sens; Borges, Endler Marcel – Journal of Chemical Education, 2019
Here, students determine aspirin (acetylsalicylic acid) mass in pharmaceutical tablets using a colorimetric method. Aspirin, salicylate, and salicylic acid do not absorb visible light. Thus, in alkaline medium, acetylsalicylic acid was hydrolyzed to salicylate; then, it was reacted with an acidic Fe(III) solution, and a violet complex was formed.…
Descriptors: Spreadsheets, Drug Therapy, Light, Chemistry
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Murshid, Nimer; Cathcart, Nicole; Kitaev, Vladimir – Journal of Chemical Education, 2019
Teaching emulsion polymerization is an important benchmark in undergraduate polymer courses. However, the introduction of hands-on experiments in undergraduate polymer laboratories is challenging: experimental time, reagents, and equipment involved are the primary restraints. We report a practical emulsion polymerization laboratory experiment for…
Descriptors: Science Instruction, College Science, Undergraduate Students, Science Laboratories
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Nalliah, Ruth E. – Journal of Chemical Education, 2019
In selecting from a repertoire of traditional kinetics experiments, an instructor often has to choose among having students gain experience with the graphical method, the method of initial rates, or a temperature-dependent experiment in which students construct an Arrhenius plot. This paper presents an environmentally friendly bleaching reaction…
Descriptors: Chemistry, Science Instruction, Teaching Methods, Graphs
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Mutambuki, Jacinta M.; Fynewever, Herb; Douglass, Kevin; Cobern, William W.; Obare, Sherine O. – Journal of Chemical Education, 2019
Integrating authentic research-based experiences that mimic real-world scientific practices and relevance to student personal life into a chemistry curriculum can make abstract chemical principles more palpable to students. Unfortunately, many reported research-based experiences chemistry laboratory experiments lack relevance to a student's…
Descriptors: Science Instruction, STEM Education, Student Research, Science Laboratories
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Yong, Fang; Zhu, Qiuhong; Zhang, Guohao; Tao, Guohong; Qin, Song – Journal of Chemical Education, 2019
The stated purpose of this paper is to provide a simple and quick method to assemble pH electrodes using readily available materials. The present assembled electrodes are comparable with commercial pH electrodes, with accuracy for pH determination in the range 2-12. Furthermore, the constructed simple pH electrodes exhibit a fast and stable…
Descriptors: Science Instruction, Chemistry, Teaching Methods, Science Laboratories
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