Chemistry Teacher International : best practices in chemistry education最新文献_第9页

A new spin on electrochemistry in the undergraduate lab 本科实验室对电化学的新解读

Chemistry Teacher International : best practices in chemistry education Pub Date : 2021-11-22 DOI: 10.1515/cti-2021-0013

Holly M. Fruehwald, Olena V. Zenkina, E. Easton

{"title":"A new spin on electrochemistry in the undergraduate lab","authors":"Holly M. Fruehwald, Olena V. Zenkina, E. Easton","doi":"10.1515/cti-2021-0013","DOIUrl":"https://doi.org/10.1515/cti-2021-0013","url":null,"abstract":"Abstract The growing interest in electrochemistry over recent years has sparked an increase in the popularity of various electrochemical techniques, including more advanced methods, that have previously been overlooked in academia and industry. This makes comprehensive hands-on experience in electrochemistry a highly demanded addition to chemistry graduates. However, many students do not receive sufficient training in the theory and experimental design to confidently use and apply various electrochemical techniques throughout their undergraduate, and sometimes even in graduate studies. Here we summarize the theory and practical applications for both rotating disk electrode (RDE) and rotating ring disk electrode (RRDE) techniques. The different modes of operation of rotating ring disk voltammetry, methodologies of data analysis and interpretation as well as the scope of the information that can be extracted from the RDE/RRDE are discussed. Proposed modifications of the laboratory curriculum will allow students to examine and learn valuable information about the reactions on the surface of the electrode/liquid interface. This information will allow chemists to confidently use RDE and RRDE techniques for a wide range of research and development targets. Furthermore, incorporating these techniques into existing chemistry laboratories will help chemistry educators to enrich the undergraduate chemistry curriculum and improve students’ learning outcomes.","PeriodicalId":93272,"journal":{"name":"Chemistry Teacher International : best practices in chemistry education","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-11-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43298821","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 4

Learning Green Chemistry and its principles from Nature’s process and development of green procedures mimicking nature 从大自然的过程中学习绿色化学及其原理，发展模仿自然的绿色程序

Chemistry Teacher International : best practices in chemistry education Pub Date : 2021-11-11 DOI: 10.1515/cti-2021-0023

B. Ranu, Laksmikanta Adak, Tubai Ghosh

引用次数: 3

Simple experiments with immobilized enzymes as a contribution to green and sustainable chemistry education in the high school laboratory 用固定化酶进行简单实验，为高中实验室的绿色和可持续化学教育做出贡献

Chemistry Teacher International : best practices in chemistry education Pub Date : 2021-10-20 DOI: 10.1515/cti-2021-0019

Michael Linkwitz, I. Eilks

引用次数: 2

Measuring the mass of an electron: an undergraduate laboratory experiment with high resolution mass spectrometry 测量电子质量：高分辨率质谱的本科生实验室实验

Chemistry Teacher International : best practices in chemistry education Pub Date : 2021-10-20 DOI: 10.1515/cti-2021-0016

M. Bouza, B. Gilbert-López, J. García-Reyes, Pilar Gema Rodríguez Ortega

{"title":"Measuring the mass of an electron: an undergraduate laboratory experiment with high resolution mass spectrometry","authors":"M. Bouza, B. Gilbert-López, J. García-Reyes, Pilar Gema Rodríguez Ortega","doi":"10.1515/cti-2021-0016","DOIUrl":"https://doi.org/10.1515/cti-2021-0016","url":null,"abstract":"Abstract High-resolution mass spectrometry (HRMS) has become increasingly affordable and user-friendly. Its potential spans a wide range of applications and experiments including the measurement of accurate masses, supporting the elucidation of elemental compositions and the identification of unknown compounds. To illustrate the main features of mass spectrometry, and particularly, of HRMS, we have designed and implemented a 3-h laboratory experiment using direct infusion electrospray HRMS analysis of non-steroidal anti-inflammatory drugs (e.g., ibuprofen or naproxen) solutions, acquiring full-scan spectra in both positive and negative ionization modes. The experimental accurate mass measurements (m/z values) of selected characteristic fragment ions -so called twin ions, with common elemental composition in both ionization modes but with different charge, allow the indirect measurement of the mass of an electron with relative errors below 5% with respect to the accepted IUPAC value (0.00055 Da). The experiment demonstrates how powerful and useful HRMS can be for research challenges often encountered during undergraduate or graduate research projects as well as for addressing undergraduate level general chemistry problems that provide the opportunity to discuss aspects related to the Nature of Science in an analytical chemistry context (such as measurement precision and accuracy).","PeriodicalId":93272,"journal":{"name":"Chemistry Teacher International : best practices in chemistry education","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-10-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42123177","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Understanding Le Châtelier’s principle fundamentals: five key questions 理解Le Châtelier的基本原理：五个关键问题

Chemistry Teacher International : best practices in chemistry education Pub Date : 2021-10-15 DOI: 10.1515/cti-2020-0030

M. Peris

引用次数: 1

New approach for assigning mean oxidation number of carbons to organonitrogen and organosulfur compounds 计算有机氮和有机硫化合物碳平均氧化数的新方法

Chemistry Teacher International : best practices in chemistry education Pub Date : 2021-10-07 DOI: 10.1515/cti-2021-0015

Pong Kau Yuen, C. M. Lau

引用次数: 7

Illustrating catalysis with a handmade molecular model set: catalytic oxidation of carbon monoxide over a platinum surface 说明催化与手工分子模型集:催化氧化一氧化碳在铂表面

Chemistry Teacher International : best practices in chemistry education Pub Date : 2021-08-02 DOI: 10.1515/cti-2021-0010

R. Horikoshi, Syota Nakajima, S. Hosokawa, Y. Kobayashi, H. Kageyama

{"title":"Illustrating catalysis with a handmade molecular model set: catalytic oxidation of carbon monoxide over a platinum surface","authors":"R. Horikoshi, Syota Nakajima, S. Hosokawa, Y. Kobayashi, H. Kageyama","doi":"10.1515/cti-2021-0010","DOIUrl":"https://doi.org/10.1515/cti-2021-0010","url":null,"abstract":"Abstract Catalytic converters (automotive catalysts) and the chemical reactions they catalyze appear in general and introductory chemistry textbooks. Although the detailed mechanisms of the chemical reactions that occur in catalytic converters have been clearly revealed via recent developments in surface and computational chemistry research, the description and illustration of the catalysis are still ambiguous in textbooks. In this paper, we describe an extracurricular lecture whereby a handmade teaching aid was employed to illustrate the basic principle of the catalytic oxidation of carbon monoxide over platinum surface, which is an essential reaction occurring in catalytic converters. The teaching aid, constructed combining easily available materials, can illustrate the positions and motions of the molecules on the platinum surface during catalytic oxidation. The lecture was favorably received by non-chemistry majors and high school students. Despite the difficulty of the topic, the audience displayed a relatively high level of understanding.","PeriodicalId":93272,"journal":{"name":"Chemistry Teacher International : best practices in chemistry education","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-08-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1515/cti-2021-0010","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45437810","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Educational reconstruction of size-depended-properties in nanotechnology for teaching in tertiary education 高等教育教学中纳米技术尺寸依赖特性的教育重建

Chemistry Teacher International : best practices in chemistry education Pub Date : 2021-07-13 DOI: 10.1515/cti-2021-0011

Ioannis Metaxas, Emily Michailidi, D. Stavrou, Ioannis V. Pavlidis

引用次数: 2

Homemade bismuth plating by galvanic displacement from bismuth subsalicylate tablets: a chemistry experiment for distance learning 国产亚水杨酸铋片电镀铋的远程化学实验

Chemistry Teacher International : best practices in chemistry education Pub Date : 2021-06-30 DOI: 10.1515/cti-2021-0002

Jose Luis Aguilar-Charfen, Ines Castro-Sayago, Jimena Turnbull-Agraz, J. G. Ibanez

引用次数: 9

Using electrostatic potential maps as visual representations to promote better understanding of chemical bonding 使用静电势图作为视觉表示，以促进更好地理解化学键

Chemistry Teacher International : best practices in chemistry education Pub Date : 2021-06-10 DOI: 10.1515/cti-2021-0012

Georgios Tsaparlis, Giannoula Pantazi, E. Pappa, B. Byers

{"title":"Using electrostatic potential maps as visual representations to promote better understanding of chemical bonding","authors":"Georgios Tsaparlis, Giannoula Pantazi, E. Pappa, B. Byers","doi":"10.1515/cti-2021-0012","DOIUrl":"https://doi.org/10.1515/cti-2021-0012","url":null,"abstract":"Abstract Static visual representations (VRs) of chemical structures are necessary for an understanding of chemical bonding, a topic which continues to lead to learning difficulties and misconceptions for many students. The efficacy and problems associated with the use of VRs of chemical structures and chemical bonding in the form of electrostatic potential maps resulting from accurate quantum mechanical calculations are the subject of this study, which involved a sample of first year, second semester students, studying the elective course “Science Education” (N = 31). Students distinguished between nonpolar and polar covalent bonding, however, they encountered difficulties with concepts related to ionic bonding. Most students did not employ multistructural thinking (in the sense of the SOLO taxonomy), when providing explanations about the variation of bond polarity. Persistence of a covalent-ionic bond dichotomy was apparent, while for some, ions can be involved in both ionic and covalent bonding. Many students preferred to use their established high school knowledge. On a positive note, many students were clearly affected by the information provided by the colored VRs. Finally, the minimal experience of our students with these VRs leads us to believe that a more systematic and extensive coverage would be likely to produce improved outcomes.","PeriodicalId":93272,"journal":{"name":"Chemistry Teacher International : best practices in chemistry education","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-06-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1515/cti-2021-0012","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45489446","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 4