Pub Date : 2020-01-01DOI: 10.3866/pku.dxhx202001002
Z. Meng
: There are some problems in the condensation polymerization teaching, such as the ratio of function groups, the Polyester linear equilibrium polycondensation kinetic equation, etc . The students were often puzzled with these problems. Based on many years of polymer chemistry teaching experience, these problems were discussed in this paper to provide some reference for peers teaching and students learning.
{"title":"Exploration on Some Problems about Condensation Polymerization in Polymer Chemistry Teaching","authors":"Z. Meng","doi":"10.3866/pku.dxhx202001002","DOIUrl":"https://doi.org/10.3866/pku.dxhx202001002","url":null,"abstract":": There are some problems in the condensation polymerization teaching, such as the ratio of function groups, the Polyester linear equilibrium polycondensation kinetic equation, etc . The students were often puzzled with these problems. Based on many years of polymer chemistry teaching experience, these problems were discussed in this paper to provide some reference for peers teaching and students learning.","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":"70220892","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}
中图分类号:G64;O6 Golden Dream, Touch-and-Go: Construction and Thinking of OffCampus Practical Teaching Base for Chemistry Major Jian-hua Jia *, Zhengping Qiao, Dawei Wang, Shujun Li, Hui Chao, Fang Zhu * School of Chemistry, Sun Yat-Sen University, Guangzhou 510275, P. R. China. Abstract: Higher education should adapt to the trend of the world and the changes of the times. Undergraduate education needs to further improve the proportion of practical teaching, strengthen the combination of theoretical teaching and practical teaching, and improve the mechanism of collaborative education. According to the needs of subject development and enterprise development, the school of chemistry of Sun Yat-Sen University and Kingfa Technology Co., Ltd. (referred to as Kingfa Technology) jointly build the practical teaching base for college students. Taking this base as an example, this paper discusses the problems encountered in the construction process and the construction contents, as well as the achievements of practical teaching base.
{"title":"Golden Dream, Touch-and-Go: Construction and Thinking of Off-Campus Practical Teaching Base for Chemistry Major","authors":"J. Jia, Zheng Qiao, Dawei Wang, Shujun Li, Huizi Chao, Fang Zhu","doi":"10.3866/pku.dxhx202002006","DOIUrl":"https://doi.org/10.3866/pku.dxhx202002006","url":null,"abstract":"中图分类号:G64;O6 Golden Dream, Touch-and-Go: Construction and Thinking of OffCampus Practical Teaching Base for Chemistry Major Jian-hua Jia *, Zhengping Qiao, Dawei Wang, Shujun Li, Hui Chao, Fang Zhu * School of Chemistry, Sun Yat-Sen University, Guangzhou 510275, P. R. China. Abstract: Higher education should adapt to the trend of the world and the changes of the times. Undergraduate education needs to further improve the proportion of practical teaching, strengthen the combination of theoretical teaching and practical teaching, and improve the mechanism of collaborative education. According to the needs of subject development and enterprise development, the school of chemistry of Sun Yat-Sen University and Kingfa Technology Co., Ltd. (referred to as Kingfa Technology) jointly build the practical teaching base for college students. Taking this base as an example, this paper discusses the problems encountered in the construction process and the construction contents, as well as the achievements of practical teaching base.","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":"70221083","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}
A blended learning curriculum, Chemistry Laboratory Safety, has been constructed by the National Demonstration Center for Experimental Chemistry Education of Lanzhou University. Through the combination of online and offline teaching modes, the course which integrates safety training, virtual simulation learning, safety assessment and access certification has been established, and a three-dimensional, systematic and linked safety access information management system has also been established. It serves as an effective carrier for universities to carry out laboratory safety education and assessment. The students' safety values, the safety awareness of environmental protection, and the efficiency of experimental safety training are improved by the developing of the blended teaching mode, which has a positive effect on diversified and standardized safety education system. Key Word: Blended learning; Chemistry laboratory safety; Curriculum construction; Virtual chemistry experiment 化学实验室是化学人才培养和科学研究的重要基地,实验中会用到多种化学品以及和压力、电 气相关的设备,并产生成分复杂的化学废弃物,因此实验室安全教育受到越来越多高校的重视[1–3]。 2015 年教育部化学类专业教学指导委员会制定的《化学类专业本科教学质量国家标准》,明确要求 学生掌握化学实验基本技能的同时还要具有安全意识、环保意识和可持续发展理念[4]。 当前高校的实验室安全与环保教学体系还不够健全、实验安全环境和条件建设不到位、学生自 大 学 化 学 Univ. Chem. 2021, 36 (2), 2002031 (2 of 7) 我防护和环境保护意识养成不足等问题较为普遍,化学实验室中发生的火灾、爆炸等事故常见于报 道,造成财产损失的同时甚至造成了人员的伤亡[5,6]。事故产生的原因主要有两个:一是实验原料及 设备本身的危险性;二是操作者的专业知识及安全责任意识不足[7]。将实验室安全与环保教育强制 纳入实验准入的前置环节,唤起学生的安全责任意识与环保意识,养成良好的安全行为习惯,是化 学实验室安全的保障,是提高学生安全素质的内在要求,是国家法律法规的要求,也是构建平安校 园的前提。 1 教学理念与目标 化学实验室安全知识体系复杂,不仅包含消防、用电、压力容器、辐射等安全知识,还有事故 的防范与处理、化学废弃物的分类回收等内容,还要及时了解不断更新的安全标准及行业规范。在 高校化学实验安全培训中,多针对理论知识的介绍,抽象且难于讲解,事故处理的实际演练也很难 进行。将互联网和信息化技术运用到实践教学的教学方式,不仅可以充分发挥学生自主学习能力, 还可以弥补真实实验在安全演练中的局限性[3,8,9]。 依托互联网平台,我们设置了大型开放式在线课程“化学实验室安全”,通过混合式教学模式, 探索出符合时代发展和实际要求的教学体系。本课程面向所有即将进入化学实验室的本科生(包括化 学、物理、生物、医学、环境等专业的同学)以及化学化工学院新入校的研究生,以弥补部分研究生 在本科期间未系统进行安全培训之缺。 2 课程体系 课程采用多手段联合式教学方法(图 1)。第一步,对即将开展化学实验的学生进行系列安全培 训,建立基本的化学安全知识体系。第二步,利用网络学习的便利性与碎片化时间,学生自主进行 线上化学安全理论知识学习与安全仿真实验练习。将基础实验中操作点全面、安全知识丰富、涉及 危化品多的两个经典实验设计为仿真实验,采用三维建模模拟了事故现场,由学生进行虚拟仿真演 习。第三步,对学生进行线上化学实验室安全考核,发放合格证书,作为学生进入实验室的准入资 质。
{"title":"Exploration and Application of Blended Learning in Chemistry Laboratory Safety Course","authors":"Wei Wang, Dong Lü, Lijun Dong, Cheng Yuan, Yongwen Shen, Jingfeng Lan, Guangnong Lu, Xiangyang Xu","doi":"10.3866/pku.dxhx202002031","DOIUrl":"https://doi.org/10.3866/pku.dxhx202002031","url":null,"abstract":"A blended learning curriculum, Chemistry Laboratory Safety, has been constructed by the National Demonstration Center for Experimental Chemistry Education of Lanzhou University. Through the combination of online and offline teaching modes, the course which integrates safety training, virtual simulation learning, safety assessment and access certification has been established, and a three-dimensional, systematic and linked safety access information management system has also been established. It serves as an effective carrier for universities to carry out laboratory safety education and assessment. The students' safety values, the safety awareness of environmental protection, and the efficiency of experimental safety training are improved by the developing of the blended teaching mode, which has a positive effect on diversified and standardized safety education system. Key Word: Blended learning; Chemistry laboratory safety; Curriculum construction; Virtual chemistry experiment 化学实验室是化学人才培养和科学研究的重要基地,实验中会用到多种化学品以及和压力、电 气相关的设备,并产生成分复杂的化学废弃物,因此实验室安全教育受到越来越多高校的重视[1–3]。 2015 年教育部化学类专业教学指导委员会制定的《化学类专业本科教学质量国家标准》,明确要求 学生掌握化学实验基本技能的同时还要具有安全意识、环保意识和可持续发展理念[4]。 当前高校的实验室安全与环保教学体系还不够健全、实验安全环境和条件建设不到位、学生自 大 学 化 学 Univ. Chem. 2021, 36 (2), 2002031 (2 of 7) 我防护和环境保护意识养成不足等问题较为普遍,化学实验室中发生的火灾、爆炸等事故常见于报 道,造成财产损失的同时甚至造成了人员的伤亡[5,6]。事故产生的原因主要有两个:一是实验原料及 设备本身的危险性;二是操作者的专业知识及安全责任意识不足[7]。将实验室安全与环保教育强制 纳入实验准入的前置环节,唤起学生的安全责任意识与环保意识,养成良好的安全行为习惯,是化 学实验室安全的保障,是提高学生安全素质的内在要求,是国家法律法规的要求,也是构建平安校 园的前提。 1 教学理念与目标 化学实验室安全知识体系复杂,不仅包含消防、用电、压力容器、辐射等安全知识,还有事故 的防范与处理、化学废弃物的分类回收等内容,还要及时了解不断更新的安全标准及行业规范。在 高校化学实验安全培训中,多针对理论知识的介绍,抽象且难于讲解,事故处理的实际演练也很难 进行。将互联网和信息化技术运用到实践教学的教学方式,不仅可以充分发挥学生自主学习能力, 还可以弥补真实实验在安全演练中的局限性[3,8,9]。 依托互联网平台,我们设置了大型开放式在线课程“化学实验室安全”,通过混合式教学模式, 探索出符合时代发展和实际要求的教学体系。本课程面向所有即将进入化学实验室的本科生(包括化 学、物理、生物、医学、环境等专业的同学)以及化学化工学院新入校的研究生,以弥补部分研究生 在本科期间未系统进行安全培训之缺。 2 课程体系 课程采用多手段联合式教学方法(图 1)。第一步,对即将开展化学实验的学生进行系列安全培 训,建立基本的化学安全知识体系。第二步,利用网络学习的便利性与碎片化时间,学生自主进行 线上化学安全理论知识学习与安全仿真实验练习。将基础实验中操作点全面、安全知识丰富、涉及 危化品多的两个经典实验设计为仿真实验,采用三维建模模拟了事故现场,由学生进行虚拟仿真演 习。第三步,对学生进行线上化学实验室安全考核,发放合格证书,作为学生进入实验室的准入资 质。","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":"70221344","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.dxhx202003025
Wang Xiaokang, Li Haokun, Zou Siyuan, Sun Xingwen
: An asymmetric synthetic experiment that encompasses the knowledge of stereoselectivity and the practice of Schlenk techniques is described. In this experiment, Zn-mediated allylation of an ( R )- N - tert -butanesulfinyl imine is performed using different conditions of solvent and additive. The reactions give both diastereomers in good yields and in various diastereomeric ratio ( dr ), which is determined by 1 H, 19 F NMR spectroscopy and chiral HPLC. Overall, this experiment can be carried out with readily accessible reagents under mild conditions, and be finished within limited laboratory time. Moreover, it enables students to learn the basics of Schlenk techniques, the differences between enantiomers and diastereomers, how a reversal of stereochemical outcome is realized by tuning the reaction solvent and additive, and the determination of dr regarding optical compounds using HPLC and NMR spectroscopy.
描述了一个不对称合成实验，包括立体选择性的知识和施伦克技术的实践。在不同的溶剂条件和添加剂条件下，进行了锌介导的(R)- N -叔丁烷亚胺烯丙基化反应。反应生成的非对映体产率高，非对映体比(dr)不同，由1h、19f核磁共振波谱和手性高效液相色谱测定。总的来说，这个实验可以在温和的条件下用容易获得的试剂进行，并在有限的实验室时间内完成。此外，它使学生能够学习施伦克技术的基础知识，对映体和非对映体之间的区别，如何通过调整反应溶剂和添加剂来实现立体化学结果的逆转，以及使用HPLC和NMR光谱法测定光学化合物的dr。
{"title":"Diastereoselective Synthesis and Characterization of Homoallylic N-tert-Butanesulfinyl Amines: An Asymmetric Synthesis Experiment for the Undergraduate Organic Laboratory","authors":"Wang Xiaokang, Li Haokun, Zou Siyuan, Sun Xingwen","doi":"10.3866/pku.dxhx202003025","DOIUrl":"https://doi.org/10.3866/pku.dxhx202003025","url":null,"abstract":": An asymmetric synthetic experiment that encompasses the knowledge of stereoselectivity and the practice of Schlenk techniques is described. In this experiment, Zn-mediated allylation of an ( R )- N - tert -butanesulfinyl imine is performed using different conditions of solvent and additive. The reactions give both diastereomers in good yields and in various diastereomeric ratio ( dr ), which is determined by 1 H, 19 F NMR spectroscopy and chiral HPLC. Overall, this experiment can be carried out with readily accessible reagents under mild conditions, and be finished within limited laboratory time. Moreover, it enables students to learn the basics of Schlenk techniques, the differences between enantiomers and diastereomers, how a reversal of stereochemical outcome is realized by tuning the reaction solvent and additive, and the determination of dr regarding optical compounds using HPLC and NMR spectroscopy.","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":"70221651","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.dxhx202004063
Haiyan Zhao, Tao Yu, Hua Sun
: 2020 spring semester has been postponed due to the novel coronavirus outbreak in the world. Taking the valence bond theory of coordination compound of “Inorganic Chemistry” as an example, we redesign and adjust the former hybrid teaching mode in view of the problems encountered in the online teaching and learning. The practice shows that the online hybrid teaching mode has cultivated the students’ self-regulated learning ability, provided a good learning experience for students, and achieved good teaching effect.
{"title":"Exploration and Practice of Online Hybrid Teaching Based on the Combination of Chaoxing Learning and Dingtalk: Taking the Valence Bond Theory of Coordination Compounds as an Example","authors":"Haiyan Zhao, Tao Yu, Hua Sun","doi":"10.3866/pku.dxhx202004063","DOIUrl":"https://doi.org/10.3866/pku.dxhx202004063","url":null,"abstract":": 2020 spring semester has been postponed due to the novel coronavirus outbreak in the world. Taking the valence bond theory of coordination compound of “Inorganic Chemistry” as an example, we redesign and adjust the former hybrid teaching mode in view of the problems encountered in the online teaching and learning. The practice shows that the online hybrid teaching mode has cultivated the students’ self-regulated learning ability, provided a good learning experience for students, and achieved good teaching effect.","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":"70223029","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.dxhx201907039
Lingling Wei, H. Jiao
: A research-based comprehensive experiment was introduced: co-precipitation synthesis, structure characterization and photoluminescent properties of K 2 GeF 6 :Mn phosphors. Chemical redox and co-precipitation method was employed to synthesize K 2 GeF 6 :Mn phosphors. By using XRD, SEM and PL spectra characterization techniques, the effects of Mn contents and reactive temperatures on the structure and properties of K 2 GeF 6 :Mn phosphors were studied. The red phosphors show great potential in LEDs applications. Through this experiment, students can master the basic laboratory skills; interpret the experimental principles with their basic theoretical knowledge, which will further enhance their scientific research ability and comprehensive application of knowledge.
{"title":"Study on Co-precipitation Synthesis, Structure Characterization and Photoluminescent Properties of K2GeF6: Mn Phosphors","authors":"Lingling Wei, H. Jiao","doi":"10.3866/pku.dxhx201907039","DOIUrl":"https://doi.org/10.3866/pku.dxhx201907039","url":null,"abstract":": A research-based comprehensive experiment was introduced: co-precipitation synthesis, structure characterization and photoluminescent properties of K 2 GeF 6 :Mn phosphors. Chemical redox and co-precipitation method was employed to synthesize K 2 GeF 6 :Mn phosphors. By using XRD, SEM and PL spectra characterization techniques, the effects of Mn contents and reactive temperatures on the structure and properties of K 2 GeF 6 :Mn phosphors were studied. The red phosphors show great potential in LEDs applications. Through this experiment, students can master the basic laboratory skills; interpret the experimental principles with their basic theoretical knowledge, which will further enhance their scientific research ability and comprehensive application of knowledge.","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":"70219291","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.dxhx201904010
Kai Li, 郑州 sup 郑州大学化学与分子工程学院, Huijie Lu, Yuanyuan Li, Shuangquan Zang, B. Tang, 郑州 sup 河南工业大学化学化工与环境学院, 中国 香港 sup 香港科技大学化学系
: Aggregation-induced emission (AIE) molecules exhibit intense emission in aggregated state but weak or even no fluorescence in dispersed state. The first AIE molecule was reported in 2001. Since then, various of AIE molecules were developed successively, which were widely applied in fields of photoelectric materials, fluorescence chemosensors and bioimaging, etc . Salicylaldehyde azine is a classic AIE molecule with the merits of simple synthesis and intense luminescence. In this comprehensive experiment, the precursor salicylaldehyde is first synthesized using Reimer-Tiemann reaction. Then it reacts with azine to obtain the AIE molecule of salicylaldehyde azine. Through the experiment, students will practice the synthetic method of Reimer-Tiemann reaction and grasp the origination of AIE characteristics of salicylaldehyde azine. Also, students will learn about the applications of AIE molecules through class and network learning.
{"title":"A Comprehensive Experiment on Synthesis of Aggregation-Induced Emitting Salicylaldehyde Azine Using Reimer-Tiemann Reaction","authors":"Kai Li, 郑州 sup 郑州大学化学与分子工程学院, Huijie Lu, Yuanyuan Li, Shuangquan Zang, B. Tang, 郑州 sup 河南工业大学化学化工与环境学院, 中国 香港 sup 香港科技大学化学系","doi":"10.3866/pku.dxhx201904010","DOIUrl":"https://doi.org/10.3866/pku.dxhx201904010","url":null,"abstract":": Aggregation-induced emission (AIE) molecules exhibit intense emission in aggregated state but weak or even no fluorescence in dispersed state. The first AIE molecule was reported in 2001. Since then, various of AIE molecules were developed successively, which were widely applied in fields of photoelectric materials, fluorescence chemosensors and bioimaging, etc . Salicylaldehyde azine is a classic AIE molecule with the merits of simple synthesis and intense luminescence. In this comprehensive experiment, the precursor salicylaldehyde is first synthesized using Reimer-Tiemann reaction. Then it reacts with azine to obtain the AIE molecule of salicylaldehyde azine. Through the experiment, students will practice the synthetic method of Reimer-Tiemann reaction and grasp the origination of AIE characteristics of salicylaldehyde azine. Also, students will learn about the applications of AIE molecules through class and network learning.","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":"70214896","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.dxhx201911042
Xia Lin, Yingxue Guo, Junyu Gao, Meng Huo, Guangzhen Luo
{"title":"Extraction and Modification of Cellulose and Preparation of Hydrogel from Waste Cotton","authors":"Xia Lin, Yingxue Guo, Junyu Gao, Meng Huo, Guangzhen Luo","doi":"10.3866/pku.dxhx201911042","DOIUrl":"https://doi.org/10.3866/pku.dxhx201911042","url":null,"abstract":"","PeriodicalId":23447,"journal":{"name":"大学化学","volume":"35 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70220619","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.dxhx202002076
Yingte Sun, Shuyong Zhang
: The application conditions of pre-equilibrium and steady-state approximations usually used for treatment of complex chemical kinetics are discussed. Based on the characters of opposing reaction, the simplified application conditions for pre-equilibrium approximation is proposed. The shortcoming of the former conditions is pointed out. By defining a dimensionless parameter relating to the discrepancy from steady state and using graphic method, the application conditions of steady-state approximation for the consecutive reaction is clarified. When the rate for consumption of the intermediate is 100 times larger than its generation rate, the error by using steady-state approximation is less than 1%, which is a good approximation.
{"title":"Analysis on the Application Conditions of the Pre-Equilibrium and Steady-State Approximations","authors":"Yingte Sun, Shuyong Zhang","doi":"10.3866/pku.dxhx202002076","DOIUrl":"https://doi.org/10.3866/pku.dxhx202002076","url":null,"abstract":": The application conditions of pre-equilibrium and steady-state approximations usually used for treatment of complex chemical kinetics are discussed. Based on the characters of opposing reaction, the simplified application conditions for pre-equilibrium approximation is proposed. The shortcoming of the former conditions is pointed out. By defining a dimensionless parameter relating to the discrepancy from steady state and using graphic method, the application conditions of steady-state approximation for the consecutive reaction is clarified. When the rate for consumption of the intermediate is 100 times larger than its generation rate, the error by using steady-state approximation is less than 1%, which is a good approximation.","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":"70221764","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.dxhx201905048
Li Han, Xin Jin, Wei Zhang
: The methodic error of reaction between acetone and iodine was investigated using a simple and novel method. The relative error was calculated to as low as 10 − 4 . We also give a discussion on the reason causing this error.
{"title":"Discussion on Methodic Error of the Reaction between Acetone and Iodine","authors":"Li Han, Xin Jin, Wei Zhang","doi":"10.3866/pku.dxhx201905048","DOIUrl":"https://doi.org/10.3866/pku.dxhx201905048","url":null,"abstract":": The methodic error of reaction between acetone and iodine was investigated using a simple and novel method. The relative error was calculated to as low as 10 − 4 . We also give a discussion on the reason causing this error.","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":"70216507","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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