Pub Date : 2020-01-01DOI: 10.3866/pku.dxhx201912070
Xingyu Chen, Xinyu Li, Zhiqian Wang
: This paper provides a practical explanation of the comparison between nucleophilicity and basicity of nucleophiles. The similarities are explained based on the principle of “structure determines property”, and the differences are explained by combining Hard-Soft-Acid-Base theory and the steric hindrance factor.
{"title":"Comparison between Nucleophilicity and Basicity Using the Principle of “Structure Determines Properties”","authors":"Xingyu Chen, Xinyu Li, Zhiqian Wang","doi":"10.3866/pku.dxhx201912070","DOIUrl":"https://doi.org/10.3866/pku.dxhx201912070","url":null,"abstract":": This paper provides a practical explanation of the comparison between nucleophilicity and basicity of nucleophiles. The similarities are explained based on the principle of “structure determines property”, and the differences are explained by combining Hard-Soft-Acid-Base theory and the steric hindrance factor.","PeriodicalId":23447,"journal":{"name":"University Chemistry","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70220775","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}
Pub Date : 2020-01-01DOI: 10.3866/pku.dxhx202002046
Chen Ling, Shuyong Zhang
: After first established in 1835, the definition of catalyst has undergone several progresses. In 1996, IUPAC Nomenclature Committee proposed a new definition of catalyst. But till now this new definition has not been adopted extensively. In this paper, the fundamental characteristics of catalyst are listed and discussed with the essential features being clarified. Based on these discussion, a new definition of catalyst is suggested. The concept of negative catalyst is analyzed based on the essential features of catalyst. It is suggested to replace negative catalyst by inhibitor. It is meaningful for us to get a better understanding of catalyst and correct misunderstandings in the present physical chemistry textbooks.
{"title":"Analysis of the Definitions Related to Catalyst","authors":"Chen Ling, Shuyong Zhang","doi":"10.3866/pku.dxhx202002046","DOIUrl":"https://doi.org/10.3866/pku.dxhx202002046","url":null,"abstract":": After first established in 1835, the definition of catalyst has undergone several progresses. In 1996, IUPAC Nomenclature Committee proposed a new definition of catalyst. But till now this new definition has not been adopted extensively. In this paper, the fundamental characteristics of catalyst are listed and discussed with the essential features being clarified. Based on these discussion, a new definition of catalyst is suggested. The concept of negative catalyst is analyzed based on the essential features of catalyst. It is suggested to replace negative catalyst by inhibitor. It is meaningful for us to get a better understanding of catalyst and correct misunderstandings in the present physical chemistry textbooks.","PeriodicalId":23447,"journal":{"name":"University Chemistry","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70221302","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}
Pub Date : 2020-01-01DOI: 10.3866/pku.dxhx202002048
Qunhui Wang, Na Song, M. Gao, Chuanfu Wu, Baorui Liang
: As a required course for the environmental engineering major, environmental chemistry has overlapped teaching content with the four major basic chemistry courses (inorganic chemistry, organic chemistry, physical chemistry and analytical chemistry). In order to improve classroom teaching efficiency and students’ learning enthusiasm, our teaching team summarizes and analyzes the similar knowledge between environmental chemistry and the four basic chemistry courses, and then updates and optimizes the teaching content. Meanwhile, with assorted teaching methods including questioning, comparing and discussion, we guide students to explore “new knowledge” from “known knowledge” to deepen knowledge layer by layer. Furthermore, the “rain classroom” teaching mode is applied to help the teaching connection, which can improve the teaching effect.
{"title":"Study on the Teaching Connection between Environmental Chemistry and Four Basic Chemistry Courses","authors":"Qunhui Wang, Na Song, M. Gao, Chuanfu Wu, Baorui Liang","doi":"10.3866/pku.dxhx202002048","DOIUrl":"https://doi.org/10.3866/pku.dxhx202002048","url":null,"abstract":": As a required course for the environmental engineering major, environmental chemistry has overlapped teaching content with the four major basic chemistry courses (inorganic chemistry, organic chemistry, physical chemistry and analytical chemistry). In order to improve classroom teaching efficiency and students’ learning enthusiasm, our teaching team summarizes and analyzes the similar knowledge between environmental chemistry and the four basic chemistry courses, and then updates and optimizes the teaching content. Meanwhile, with assorted teaching methods including questioning, comparing and discussion, we guide students to explore “new knowledge” from “known knowledge” to deepen knowledge layer by layer. Furthermore, the “rain classroom” teaching mode is applied to help the teaching connection, which can improve the teaching effect.","PeriodicalId":23447,"journal":{"name":"University Chemistry","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70221323","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}
Pub Date : 2020-01-01DOI: 10.3866/pku.dxhx202002054
Houjin Li, Liuping Chen
: Chemistry is a central science. However, the public’s recognition of chemistry needs to be promoted, and the prejudice needs to be reduced. Chemical science popularization is a long-term, complex and arduous social education project, which is of great significance to promote social harmony and improve people’s quality of life. This paper summarizes the current status of chemical science popularization in China, and puts forward the innovative development countermeasures which focus on improving public participation, training popular science talents, carrying out popular science popularization education at different levels, creating high-quality science popularization works and opening up new positions and approaches of chemical science popularization. This paper has the reference value for the science popularization colleagues.
{"title":"Current Status and Innovative Development Countermeasures of Chemical Science Popularization in China","authors":"Houjin Li, Liuping Chen","doi":"10.3866/pku.dxhx202002054","DOIUrl":"https://doi.org/10.3866/pku.dxhx202002054","url":null,"abstract":": Chemistry is a central science. However, the public’s recognition of chemistry needs to be promoted, and the prejudice needs to be reduced. Chemical science popularization is a long-term, complex and arduous social education project, which is of great significance to promote social harmony and improve people’s quality of life. This paper summarizes the current status of chemical science popularization in China, and puts forward the innovative development countermeasures which focus on improving public participation, training popular science talents, carrying out popular science popularization education at different levels, creating high-quality science popularization works and opening up new positions and approaches of chemical science popularization. This paper has the reference value for the science popularization colleagues.","PeriodicalId":23447,"journal":{"name":"University Chemistry","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70221549","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}
Pub Date : 2020-01-01DOI: 10.3866/pku.dxhx202003031
Ying Zhang, Guoyan Zhang, Xin Quan
In this paper, the different ideas about the concept of the oxidation number in domestic chemistry textbooks have been discussed. Based on this, we propose to use the term of specified charge number instead of formal charge number and apparent charge number to describe the oxidation number. Through the interpretation of the definition of the oxidation number, we draw some important inferences and finally introduce our explorations and attempts on the contents of the oxidation number in compiling the inorganic chemistry textbook, and suggest introducing the valence-shell electron number method to determine the oxidation number of elements in inorganic chemistry and general chemistry textbooks.
{"title":"The Third Discussion on the Oxidation Number","authors":"Ying Zhang, Guoyan Zhang, Xin Quan","doi":"10.3866/pku.dxhx202003031","DOIUrl":"https://doi.org/10.3866/pku.dxhx202003031","url":null,"abstract":"In this paper, the different ideas about the concept of the oxidation number in domestic chemistry textbooks have been discussed. Based on this, we propose to use the term of specified charge number instead of formal charge number and apparent charge number to describe the oxidation number. Through the interpretation of the definition of the oxidation number, we draw some important inferences and finally introduce our explorations and attempts on the contents of the oxidation number in compiling the inorganic chemistry textbook, and suggest introducing the valence-shell electron number method to determine the oxidation number of elements in inorganic chemistry and general chemistry textbooks.","PeriodicalId":23447,"journal":{"name":"University Chemistry","volume":"21 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70221713","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}
Pub Date : 2020-01-01DOI: 10.3866/pku.dxhx202003052
Yuan Zheng, Quan Lan, Hongyan Feng, Weipeng Wu, Pingping Zhu
: The selection principles and applicability of several commonly used chemical protective gloves were analyzed in detail. The characteristics of chemical structure, polarity and solubility of polymer, and the anti-penetration and anti-aging properties of chemical protective gloves of different materials would be introduced in this paper.
{"title":"Laboratory Personal Safety Protection: Selection and Analysis of Chemical Protective Gloves","authors":"Yuan Zheng, Quan Lan, Hongyan Feng, Weipeng Wu, Pingping Zhu","doi":"10.3866/pku.dxhx202003052","DOIUrl":"https://doi.org/10.3866/pku.dxhx202003052","url":null,"abstract":": The selection principles and applicability of several commonly used chemical protective gloves were analyzed in detail. The characteristics of chemical structure, polarity and solubility of polymer, and the anti-penetration and anti-aging properties of chemical protective gloves of different materials would be introduced in this paper.","PeriodicalId":23447,"journal":{"name":"University Chemistry","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70222221","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}
Pub Date : 2020-01-01DOI: 10.3866/pku.dxhx202003079
Yi Yang, P. Su, Jiayin Song, Chunting Zhang, Yaozhi Zhang
: In order to achieve “postponement of school without suspension of learning” during the prevention and control of new coronavirus pneumonia, the online teaching strategy was constructed based on Enterprise WeChat and Integrated Online Education Platform for the online teaching of Separation Science and Technology. The student-centered teaching methods were applied in online teaching process.
{"title":"Practice of Online Teaching Based on Enterprise WeChat and Integrated Online Education Platform","authors":"Yi Yang, P. Su, Jiayin Song, Chunting Zhang, Yaozhi Zhang","doi":"10.3866/pku.dxhx202003079","DOIUrl":"https://doi.org/10.3866/pku.dxhx202003079","url":null,"abstract":": In order to achieve “postponement of school without suspension of learning” during the prevention and control of new coronavirus pneumonia, the online teaching strategy was constructed based on Enterprise WeChat and Integrated Online Education Platform for the online teaching of Separation Science and Technology. The student-centered teaching methods were applied in online teaching process.","PeriodicalId":23447,"journal":{"name":"University Chemistry","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70222265","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}
: This paper introduces practices and experiences of setting up the intelligent open sharing platform for experiments of the National Demonstration Center for Experimental Chemistry Education of Xiamen University, such as the construction framework, management system, operation process and operation effect, hoping to provide applicable guidance for the open management of domestic university laboratory.
{"title":"Exploration of Constructing the Intelligent Open Sharing Platform for Experiments","authors":"Yinyun Lü, Rui Pan, Yuhua Weng, Yonghong Ruan, Pingping Wu, Laiying Zhang, Shunv Peng, Yuqing Chen, Chunyan Zhang, Zhiqiang Dong, Xiaoqing Ouyang, Chanzi Ruan, Zhenling Xu, Changming Yan, Yanping Ren","doi":"10.3866/pku.dxhx202003064","DOIUrl":"https://doi.org/10.3866/pku.dxhx202003064","url":null,"abstract":": This paper introduces practices and experiences of setting up the intelligent open sharing platform for experiments of the National Demonstration Center for Experimental Chemistry Education of Xiamen University, such as the construction framework, management system, operation process and operation effect, hoping to provide applicable guidance for the open management of domestic university laboratory.","PeriodicalId":23447,"journal":{"name":"University Chemistry","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70222411","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}
Pub Date : 2020-01-01DOI: 10.3866/pku.dxhx202004041
Lei Zhao, Tingyu Zhu, Aidong Zhou
: During the outbreak of COVID-19, the teaching team of chemical engineering principles experiment of Nanjing University uses Tencent Meeting and Pedagogy Square as online platforms, applies the unit operation experiment MOOC particularly designed by our course team, and introduces the simulation software of Oubeier Cloud Classroom and Es-online. The online classroom delivers equivalent teaching as the offline classroom.
{"title":"Online Teaching of Chemical Engineering Principles Experiment during Epidemic Prevention and Control","authors":"Lei Zhao, Tingyu Zhu, Aidong Zhou","doi":"10.3866/pku.dxhx202004041","DOIUrl":"https://doi.org/10.3866/pku.dxhx202004041","url":null,"abstract":": During the outbreak of COVID-19, the teaching team of chemical engineering principles experiment of Nanjing University uses Tencent Meeting and Pedagogy Square as online platforms, applies the unit operation experiment MOOC particularly designed by our course team, and introduces the simulation software of Oubeier Cloud Classroom and Es-online. The online classroom delivers equivalent teaching as the offline classroom.","PeriodicalId":23447,"journal":{"name":"University Chemistry","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70222926","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}
Electronegativity has been one of the most important concepts in chemistry. It plays a critical role in fundamental chemistry courses. This paper proposed a view of three periods on the development of electronegativity. The process of deepening and gradually developing in understanding of electronegativity scale is briefly described. On the basis of a brief description of different electronegativity scales, the difference between absolute electronegativity scale, Pauling type electronegativity scale, Allen electronegativity scale and its modified Rahm electronegativity scale were discussed emphatically. The re-discussion is undoubtedly helpful for the in-depth understanding about the concept of electronegativity and the reform of teaching contents in fundamental studies.
{"title":"Re-discussion on the Development of Electronegativity Scales","authors":"Ren-qing Lü, 山东 青岛 sup 中国石油大学理学院, T. Sun, Fang Wang, Shutao Wang, 山东 东营 sup 胜利第一中学化学组","doi":"10.3866/pku.dxhx201903038","DOIUrl":"https://doi.org/10.3866/pku.dxhx201903038","url":null,"abstract":"Electronegativity has been one of the most important concepts in chemistry. It plays a critical role in fundamental chemistry courses. This paper proposed a view of three periods on the development of electronegativity. The process of deepening and gradually developing in understanding of electronegativity scale is briefly described. On the basis of a brief description of different electronegativity scales, the difference between absolute electronegativity scale, Pauling type electronegativity scale, Allen electronegativity scale and its modified Rahm electronegativity scale were discussed emphatically. The re-discussion is undoubtedly helpful for the in-depth understanding about the concept of electronegativity and the reform of teaching contents in fundamental studies.","PeriodicalId":23447,"journal":{"name":"大学化学","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70215102","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}
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