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Brian Zacher; Sam Ferrante; Rances Romero – Journal of Chemical Education, 2023
The dissolution of cobalt(II) chloride in an appropriate binary alcohol solvent yields an equilibrium mixture, consisting of the differently colored octahedral (pink in color) and tetrahedral (blue in color) cobalt(II) coordination complexes, which can exhibit a brilliant and reversible pink-to-blue color transition over a ~10 °C window - i.e.,…
Descriptors: Chemistry, Science Education, Thermodynamics, Spectroscopy
Daniele Crisafulli; Giulia Savoca; Francesca Mancuso; Martina Mazzaferro; Marco Milone; Ilenia Pisagatti; Anna Notti; Melchiorre F. Parisi; Giuseppe Gattuso – Journal of Chemical Education, 2024
In this two-session experiment for an organic chemistry lab, students prepare a macrocyclic host compound--namely, a pillar[5]arene--by means of a templated 1,4-dimethoxybenzene/formaldehyde cyclo-oligomerization (session 1), and then, they explore its molecular recognition properties toward the 1,8-diaminooctane guest with the aid of [superscript…
Descriptors: Scientific Concepts, Organic Chemistry, Science Experiments, Laboratory Experiments
Midori Tanaka; Toshimichi Shibue – Journal of Chemical Education, 2023
High-resolution mass spectrometry (HRMS) is an analytical technique that is typically used by mass spectrometry experts. However, with recent advancements, it is becoming more accessible to students in organic chemistry laboratories. Still, a significant knowledge gap exists between these experts and students. A straightforward laboratory…
Descriptors: Organic Chemistry, Spectroscopy, Laboratory Experiments, Scientific Research
Simeen Sattar – Journal of Chemical Education, 2024
Lakes are artists' pigments made from colorants bound to an inert substrate, usually hydrated aluminum oxide. Before the late 19th century, lakes were made from natural pigments extracted from plants and insects, extracted either directly from the dyestuff or indirectly from waste materials generated in the manufacture of dyed textiles. The first…
Descriptors: Color, Science Experiments, Laboratory Experiments, Science Education
Maram Kiran; V. V. Krishnan – Journal of Chemical Education, 2023
The particle-in-a-box experiment is a well-known method used to teach quantum mechanics concepts in physical chemistry laboratories for undergraduates. The investigation involves measuring the wavelength at maximum absorbance ([lambda subscript max]) of electronic transitions in the UV-vis spectrum and linking it to the box length. As the…
Descriptors: Spectroscopy, Quantum Mechanics, Chemistry, Science Education
Ayele´n F. Crespi; Juan M. La´zaro-Marti´nez – Journal of Chemical Education, 2023
The carbonyl group of an aldehyde or ketone reacts with different types of nucleophiles through a nucleophilic addition reaction. When the nucleophile is water, the product obtained is a "gem"-diol or geminal diol. This functionalization is unstable and quickly reverts to the parent carbonyl group. The chemistry of "gem"-diols…
Descriptors: Scientific Concepts, Chemistry, Laboratory Experiments, Undergraduate Study
Celia Todd; Carlos Melchor Ceballos; Monica C. So – Journal of Chemical Education, 2022
An integrated laboratory experience using metal--organic frameworks (MOFs), a nanoporous and crystalline extended solid material composed of metal cations and organic linkers, was developed and adopted for upper-division, major-level chemistry and biochemistry students. In this laboratory, students were guided through the facile solvothermal…
Descriptors: Water Pollution, Integrated Activities, Metallurgy, Laboratory Experiments
John C. Pinti; Elizabeth A. Kras; Akanksha Patel; Chloe L. Schrier; Christopher S. Stoj; Janet R. Morrow – Journal of Chemical Education, 2022
This undergraduate laboratory experiment is designed for first-year general chemistry students with the goal of introducing the brilliant colors and magnetic properties of transition metal complexes within a bioinorganic/cell biology context. In the first laboratory period, a coordination complex formed from ferric chloride and maltol is…
Descriptors: Magnets, Metallurgy, Undergraduate Study, Laboratory Experiments
Joseph K. West; Der Vang – Journal of Chemical Education, 2022
A straightforward procedure for the synthesis of (Ph[subscript 3]P)[subscript 3]CuCF[subscript 3], a robust, air-stable trifluoromethylating agent, is reported herein. This preparation can be completed in a single 3 h laboratory session and typically provides ample yields (~79--86%) and high purity (>90%). The target complex is characterized by…
Descriptors: Science Education, Chemistry, Science Laboratories, Laboratory Experiments
Ryanne K. Ballard; Arielle Benyo; Rachel Ren; Jasmine Nguyen; Joline Nguyen; Erica Zieber; Glen Gullickson; Hyung J. Kim – Journal of Chemical Education, 2023
The aroma volatile compounds in tomatoes are strongly linked to taste and flavor. Commercial tomato varieties, however, generally lack flavor. Tomato breeding programs have therefore started to focus on increasing the flavor-enhancing volatiles, which can be more easily altered than the sugar content. Analytical efforts that identify key flavor…
Descriptors: Food, Chemistry, Evaluation, Laboratory Experiments
Abby L. Manning; Bryanna N. Roos; Amber Flynn Charlebois; Kelly Hutchinson-Anderson; Stephen G. Tajc – Journal of Chemical Education, 2023
In an effort to further develop critical thinking and problem solving skills, a guided-inquiry-based, multioutcome organic chemistry synthesis and characterization experiment was developed. Students were provided with the protocol for a time-saving microwave-assisted acetanilide synthesis reaction from acetic anhydride and an unknown primary aryl…
Descriptors: Active Learning, Inquiry, Organic Chemistry, Laboratory Experiments
Qiu-ting Huang; Yi-dan Zuo; Zhu Zhu; Liu Yang; Zhong-qun Tian; Guo-kun Liu – Journal of Chemical Education, 2024
Nitrate is a crucial parameter for assessing water quality, owing to its dual function in ecological systems. These functions can be beneficial or detrimental depending on whether nitrate concentrations are low or high, respectively. The ultraviolet spectrophotometric method (standard as 4500-NO[subscript 3]--B) is a classic method for determining…
Descriptors: Organic Chemistry, Scientific Concepts, Laboratory Experiments, Laboratory Procedures
Conklin, Alfred, Jr.; Goldcamp, Michael J.; Barrett, Jacob – Journal of Chemical Education, 2014
Ethanol is the primary oxygenate in gasoline in the United States. Gasoline containing various percentages of ethanol is readily available in the market place. A laboratory experiment has been developed in which the percentage of ethanol in hexanes can easily be determined using the O-H and alkane C-H absorptions in an infrared spectrum. Standard…
Descriptors: Science Education, Fuels, Chemistry, Spectroscopy
Wyllie, Graeme R. A. – Journal of Chemical Education, 2015
The antibacterial chemical triclosan is a common component in personal care products but recently the subject of many reports concerning environmental toxicity and health impacts. Although triclosan concentration in a soap can be determined simply via high-performance liquid chromatography, this is a technique not routinely available in the…
Descriptors: Spectroscopy, Laboratory Experiments, Undergraduate Students, Chemistry
Pires, Joa~o – Journal of Chemical Education, 2015
A laboratory experiment is described in which a simple characterization of a historical lime mortar is made by the determination of its approximate composition by a gravimetric method. Fourier transform infrared (FTIR) spectroscopy and X-ray diffraction (XRD) are also used for the qualitative characterization of the lime mortar components. These…
Descriptors: Laboratory Experiments, Program Descriptions, Spectroscopy, Qualitative Research