Effective assessment is an extremely important area of chemistry education. Typically tests measure students' knowledge critical thinking skills, vocabulary, and application concepts from one chapter to another. While it relatively straightforward such as chemical vocabulary algorithmic problem solving during a regular session with paper-pencil based testing, online test no proctoring presents significant challenges administration. In the COVID-19 term, when instruction moved online, was...

Photochromic spiropyran was covalently immobilized using alkyldiamine couplers with varying chain length (2, 4, 6, 8 methylene groups) onto an optically transparent polymeric surface. The relatively nonpolar and colourless form can be reversibly switched to a charged, highly coloured, zwitterionic merocyanine isomer UV visible light, respectively. complexes metal ions, this results in shift the absorbance spectrum, corresponding colour change is observed. Upon irradiation of complex cation...

This paper describes the use of a microsphere sensor technology that allows simple fabrication vapor arrays with reproducible response patterns. Microsphere protocols are uncomplicated and yield billions highly sensors. combined generalized Whitney−Mann−Wilcoxen (GWMW) classifier were used to discriminate between presence absence nitroaromatic compounds in high background mixtures. The was trained on one array then obtain 98.2 93.7% correct classification rates data collected using two...

This paper discusses the use of flow dynamics in a model nasal cavity as novel way to expand information available from fiber optic vapor sensor. Nasal cavities are known play an important role vertebrate olfaction; however, they have not previously been incorporated into gas-phase sensor technology. By exposing identical sensors different environments, we found that measurements combined responses provided increased discrimination series alcohols compared obtained single at anterior cavity....

Three hexadentate, podand-type, polypyridyl ligands, (5-bpy-2C)(3)Bz, (4-bpy-2C-Ph)(3)Et, and (4-phen-2C-Ph)(3)Et, their Ru(II) Fe(II) complexes have been prepared. Reaction of these ligands with produces only the monometallic hemicage species, while monometallic, bimetallic, polymetallic are formed. These species separable by column chromatography, NMR ESI mass spectrometry demonstrate that each ligand first band to elute corresponds [RuL](2+). The spectra show peaks for [RuL](2+)...

A quantitative and qualitative high-performance liquid chromatography (HPLC) analysis of single-origin chocolates is presented as a laboratory experiment for an advanced analytical chemistry course. The portion involves the determination caffeine theobromine content by internal standard calibration method then validation comparison to certified reference material. component introduces students chemometrics through use discriminant determine provenance unknown chocolate sample.

There has been considerable research on potential academic factors that can predict success in college introductory science courses. In order to support high rates for students, some institutions across the country have implemented diagnostic tests determine which students are eligible take chemistry classes. These based previous studies, demonstrated a strong mathematics background, SAT/ACT scores, and prior exposure content at school level common predictors of However, recent studies also...

Polar bears (Ursus maritimus), as hypercarnivorous Arctic species, serve vital indicators of environmental change. This study aims to explore the fecal microbiome captive polar bears, providing a basis for future comparisons with their wild counterparts. The microbial communities in samples play crucial role host's health, particularly metabolizing dietary nutrients. In wild, exhibit diversity through hunting seals, mammals, and scavenging carcasses. captivity, diet encompasses fortified...

Out of school informal learning environments provide an excellent experience for students to develop scientific curiosity and critical thinking skills. Currently, there is a range methods available supporting STEM learning. As schools focus on college career readiness, while giving high opportunities take level classes at community colleges and/or advanced placement learn the content necessary exams that will award them credit, are several other modalities could use support learners. This...

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTInvestigation of Atropisomerism in ortho-Substituted Tetraphenylporphyrins: An Experimental Module Involving Synthesis, Chromatography, and NMR SpectroscopyRuth Freitag Beeston , Shannon E. Stitzel Mitchell A. Rhea View Author Information Davidson College, Department Chemistry, P.O. Box 1749, Davidson, NC 28036Cite this: J. Chem. Educ. 1997, 74, 12, 1468Publication Date (Web):December 1, 1997Publication History Received3 August 2009Published...

Macromolecular Chemistry: The Second Century [Author Benefits](https://scimeetings.acs.org/?utm_source=pubs_content_marketing&utm_medium=website&utm_campaign=0320_MCF_NPI_Launch_Spring_Homepage&ref=pubs_content_marketing) [How to use SciMeetings](https://storage.googleapis.com/dl.morressier.com/acs/SciMeetings-ACSSpring2020-HowToGuide_M3020-Final.pdf) [Frequently Asked Questions](https://storage.googleapis.com/dl.morressier.com/acs/SciMtng_ACSNMSp2020_FAQ_M3120_Final.pdf)

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Macromolecular Chemistry: The Second Century [Author Benefits](https://scimeetings.acs.org/?utm_source=pubs_content_marketing&utm_medium=website&utm_campaign=0320_MCF_NPI_Launch_Spring_Homepage&ref=pubs_content_marketing) [How to use SciMeetings](https://storage.googleapis.com/dl.morressier.com/acs/SciMeetings-ACSSpring2020-HowToGuide_M3020-Final.pdf) [Frequently Asked Questions](https://storage.googleapis.com/dl.morressier.com/acs/SciMtng_ACSNMSp2020_FAQ_M3120_Final.pdf)

An artificial nose based on microsphere sensor arrays has been developed for the discrimination of numerous volatile organic compounds. Sensor elements consist 3-5 micron diameter silica and polymer spheres that have a fluorescent, solvatochromic dye adsorbed to surface. These sensors respond changes in local polarity environment by shifting their excitation and/or emission characteristics, thereby indicating presence different High-density are fabricated which contain thousands individual...

The need for small, fast responding detection systems is growing and fiber-optic bead arrays offer a different approach to small sensor design. Sensor are fabricated by inserting self-encoded microspheres into microwells etched the distal face of an imaging fiber. Each fiber 0.5 - 1 mm in outer diameter consists 5,000 10,000 individually clad, 3 4 micrometers optical fibers bundled together. bundles coherent, allowing each microsphere well be addressed as individual sensor. Microsphere...