Educacion Quimica最新文献_第6页

Modified Newman projections: A new representation of the Newman notations to convey conformational properties 改进的纽曼投影:纽曼符号的一种新的表示，以表达构象性质

Educacion Quimica Pub Date : 2016-10-01 DOI: 10.1016/j.eq.2016.02.003

M. Hossein Khalilian, Hormoz Khosravi, Saber Mirzaei

{"title":"Modified Newman projections: A new representation of the Newman notations to convey conformational properties","authors":"M. Hossein Khalilian, Hormoz Khosravi, Saber Mirzaei","doi":"10.1016/j.eq.2016.02.003","DOIUrl":"10.1016/j.eq.2016.02.003","url":null,"abstract":"<div><p>Conformational analysis is one of the significant subjects in the organic chemistry curriculum. Since this subject may be intricate for some beginner students, a concrete model (an activity) has been devised to explain the conformational concepts with an intriguing and simple method. This model is based on geometric shapes (particularly triangles) in which the revolution of each shape on its axis at the centroid (around its vertices and edges) simulates the rotation about a single bond in a molecule. If we take edges as lower energy (more stable) and vertices as higher energy (less stable), this revolution gives a graph almost identical to the actual conformational energy diagram of that molecule. These shapes can also incorporate into the Newman projections to form a tangible representation of these notations. Most of the participants, who got familiar with these newly modified Newman projections, found them beneficial in enhancing the students’ perception of the basic conformational properties of the molecules. Furthermore, searching for a relevant shape to match the right molecule serves as an activity that in addition to being enjoyable can encourage the students to get engaged with the topic. This model is applicable to a large variety of molecules such as the hydrocarbon, aldehyde and ketone molecules, which can also generalize to more functional groups and compounds.</p></div>","PeriodicalId":39011,"journal":{"name":"Educacion Quimica","volume":"27 4","pages":"Pages 269-277"},"PeriodicalIF":0.0,"publicationDate":"2016-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.eq.2016.02.003","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134450479","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Experimentos integrados: utilización de sensores en plantas de la galvanotecnia

Educacion Quimica Pub Date : 2016-10-01 DOI: 10.1016/j.eq.2016.04.002

Ramón Lagos , Juan Camus

{"title":"Experimentos integrados: utilización de sensores en plantas de la galvanotecnia","authors":"Ramón Lagos , Juan Camus","doi":"10.1016/j.eq.2016.04.002","DOIUrl":"10.1016/j.eq.2016.04.002","url":null,"abstract":"<div><p>Trying to integrate knowledge sometimes is very difficult in the experimental sciences, however, the electroplating industry gives us a great opportunity because it allows integrating the knowledge of electrochemistry with the analytical chemistry and hence the use of instruments of varied sophistication in the determination of analytes. The colours of different electrolytes in the bath of electrolysis, in the cited plants, allow using the colorimetric sensor to help plant operator to quantify the degree of electrodeposition of metal of the colored electrolyte. The nickel baths are of extraordinary importance in a electroplating plant, or those requiring to deposit hard copper for the printing roller or small workshops of artisans or jewelers, because nickel coating allows deposit on it, other metals as gold or silver, of greater value, improving the aesthetics value of the obtained piece part and raising their resistance to corrosion and wear. The plant experienced operator, is capable of determining the degree of depletion of electrolyte observing the intensity of the colour to be sent to quantitative analysis, with the aim of adding exactly the amount of nickel salts that need the bath. Using the colorimetric sensor allows this operation efficiently enough, allowing solving quickly, in-situ, the analytical problem.</p></div>","PeriodicalId":39011,"journal":{"name":"Educacion Quimica","volume":"27 4","pages":"Pages 264-268"},"PeriodicalIF":0.0,"publicationDate":"2016-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.eq.2016.04.002","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121982265","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 5

Listado de autores 作者名单

Educacion Quimica Pub Date : 2016-10-01 DOI: 10.1016/j.eq.2016.09.008

引用次数: 0

The phenomenon of brine rejection: a practical proposal for prospective primary teacher training 排斥盐水现象:未来小学教师培训的实用建议

Educacion Quimica Pub Date : 2016-07-01 DOI: 10.1016/j.eq.2016.03.001

José Domingo Villarroel, Daniel Zuazagoitia

引用次数: 1

Enseñanza de la estequiometría: uso de analogías y comprensión conceptual 化学计量学教学:使用类比和概念理解

Educacion Quimica Pub Date : 2016-07-01 DOI: 10.1016/j.eq.2016.04.003

Andrés Raviolo, Gabriela Lerzo

引用次数: 2

In memoriam 为纪念

Educacion Quimica Pub Date : 2016-07-01 DOI: 10.1016/j.eq.2016.05.002

Aureli Caamaño

引用次数: 0

History and the teaching of chemistry. A tribute to Thomas Lowry's textbook “Historical Introduction to Chemistry” 历史和化学教学。致敬Thomas Lowry的教科书《化学历史导论》

Educacion Quimica Pub Date : 2016-07-01 DOI: 10.1016/j.eq.2016.05.001

William B. Jensen

引用次数: 3

Graphical representation of chemical periodicity of main elements through boxplot 用箱线图表示主要元素的化学周期

Educacion Quimica Pub Date : 2016-07-01 DOI: 10.1016/j.eq.2016.04.007

João Elias Vidueira Ferreira, Maria Tayane Silva Pinheiro, Wagner Roberto Santos dos Santos, Rodrigo da Silva Maia

引用次数: 28

One hundred and one years after a milestone: Modern chemical weapons and World War I 在现代化学武器和第一次世界大战这一里程碑的101年后

Educacion Quimica Pub Date : 2016-07-01 DOI: 10.1016/j.eq.2016.04.004

Diego Vilches , Germán Alburquerque , Rodrigo Ramirez-Tagle

引用次数: 4

Desarrollo de tecnologías de la información y la comunicación para reforzar los procesos de enseñanza y aprendizaje en ciencias en el grado de maestro/a en educación infantil de la Universidad de Málaga 开发信息和通信技术，以加强马拉加大学幼儿教育硕士学位的科学教学和学习过程

Educacion Quimica Pub Date : 2016-07-01 DOI: 10.1016/j.eq.2016.04.006

Santiago Rojano Ramos , María del Mar López Guerrero , Gema López Guerrero

{"title":"Desarrollo de tecnologías de la información y la comunicación para reforzar los procesos de enseñanza y aprendizaje en ciencias en el grado de maestro/a en educación infantil de la Universidad de Málaga","authors":"Santiago Rojano Ramos , María del Mar López Guerrero , Gema López Guerrero","doi":"10.1016/j.eq.2016.04.006","DOIUrl":"10.1016/j.eq.2016.04.006","url":null,"abstract":"<div><p>The use of a blog can improve learning of experimental sciences, so a study has been developed. The blog as a strategy allows us to encourage the learning of students and their participation in the course. The study developed contains information about the use of the blog and its positive influence to improve the perception of students towards Chemistry. In quantitative terms, it was found that this tool increases the studentś academic performance thanks to better assimilation of concepts. The sample has been divided into two groups, experimental and control group, the experimental group was involved in the development of the blog, and the control group did not have access to it. In both groups, the subject was developed in the same way, and the lecturer of the two groups was the same. The results showed that the experimental group improved their learning and raised their scores, compared to the control group. Furthermore, the experimental group completed a questionnaire in which they were asked for the usefulness of the blog. The results showed that the majority of students considered the use of blog in a positive way in order to improve the learning and understanding of the subject studied.</p></div>","PeriodicalId":39011,"journal":{"name":"Educacion Quimica","volume":"27 3","pages":"Pages 226-232"},"PeriodicalIF":0.0,"publicationDate":"2016-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.eq.2016.04.006","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131102399","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 7