This research focuses on general chemistry teaching.Taking the knowledge of buffer solutions as the starting point of teaching,a group science popularization video production activity was carried out.By guiding students to complete links such as literature review,experimental design and operation,video production,and classroom presentation and sharing,it effectively improves students’ understanding and application ability of chemical knowledge,stimulates their innovative thinking and practical ability,and enhances teamwork and communication.The videos produced by students have achieved remarkable results both in and out of the classroom.Some works have won awards in science popularization video competitions.This study elaborates on the background of teaching reform,teaching design,practice process,and feedback effects in detail,providing useful examples and experience for the reform of general chemistry teaching.

Paracetamol,a common household antipyretic and analgesic,has undergone a century of exploration from its initial discovery to widespread use.It is not only a shining gem in the history of modern medicine but also a powerful tool in the fight against diseases,providing valuable insights for future drug development and production.This article comprehensively discusses paracetamol from four aspects:its development history,industrial production methods,cutting-edge research progress,and usage precautions.The aim is to enhance public awareness of safe medication practices at home and to promote in-depth research into the mechanisms of paracetamol,as well as its green and sustainable industrial production.

Single-metal-atom anchored carbon nitride(SMAs/g-C₃N₄) is a novel photocatalyst developed in recent years.Due to its unique structural advantages and excellent catalytic performance,it has demonstrated significant potential for applications in various fields,including clean energy development and environmental protection.This overview provides a brief introduction to the structure,synthesis,regulation of coordination environments,and photocatalytic applications of SMAs/g-C₃N₄,based on a review of the literature.

This article introduces the reform initiatives and practical explorations undertaken by Harbin Institute of Technology in the development of Engineering University Chemistry teaching materials.It outlines the evolution from traditional textbooks,which primarily serve as carriers of fundamental knowledge,to multi-dimensional and multi-tiered teaching resources integrating information technology.The focus is on the innovation of content and format,as well as the compilation approach and structural layout aimed at fostering knowledge acquisition,skill development,and comprehensive competency cultivation.By constructing diverse and systematic digital resources,the initiative seeks to effectively drive textbook innovation,facilitate the transformation of talent cultivation models,and better meet the requirements for training high-level engineering professionals in the new era.

The ion diffusion coefficient is a key parameter that determines the rate and efficiency of electrochemical reactions.Not only does it directly characterize the intrinsic ion kinetic transport capability of electrode materials,but it also serves as a core indicator for evaluating the power efficacy of energy storage systems such as rechargeable batteries.The galvanostatic intermittent titration technique(GITT) is an important analytical method in the field of electrochemistry,commonly used to characterize the ion diffusion coefficients and electrochemical kinetic processes of electrode materials.It plays a significant role in assessing the performance of electrode materials and guiding the analysis of structure-property relationships.This paper is based on the frontier field of electrochemical energy storage in the global strategy,focusing on the importance of ion diffusion processes in electrode materials,and introduces GITT into undergraduate electrochemistry teaching.Through the design of theoretical explanation and experimental operation,centered on the calculation of diffusion coefficients of button-type lithium/sodium-ion half-cell electrode materials,students can intuitively understand the diffusion behavior of ions in electrode materials.

In this study,the digital technology is integrated into the experiments of dipole moment determination.We illustrate the generation of molecular dipole moment by building a three-dimensional model of molecules from the microscopic perspective.We also dynamically simulate the conformational changes of molecules under the effect of an electric field to show the polarization processes.Meanwhile,the waste liquid is recycled in the experiment to reinforce the concept of green chemistry.MATLAB is also used to design procedures for visual data processing and analysis.This experimental strategy not only increases the students’ interests and motivation in learning but also enhances their data processing abilities,innovative thinking and digital literacy.Furthermore,it paves a solid foundation for the development of the intelligent experiments and the cultivation of future composite talents.

In this paper,a comprehensive innovative experiment based on coordination chemistry for undergraduatehas been designed and proposed.In the experiment,a novel metal-organic framework material Tb-MOF({[H₂N(CH₃)₂]₂[Tb₂(L)₂(H₂O)]}_n,(H₂L=4,4′-(1H-imidazole-1,3(2H)-diyl)dibenzoic acid) has been employed as a fluorescence probe to detect Roxarsone(ROX) with noticeable color changes,which greatly stimulate students’ interests in scientific research and experiment.This experiment not only can deepen students’ understanding of the knowledge points related to coordination chemistry,but also can help them master the preparation methods and basic characterization means of MOFs materials proficiently,which cultivate students’ innovative thinking and the ability to solve the practical problems.This experiment as a case of the transformation of scientific research achievements achieves the feedback of scientific research to teaching,providing important references and thoughts for the reform of experimental teaching in colleges and universities.

The homogeneous precipitation of barium sulfate has found extensive applications in biomedical,pharmaceutical,and environmental remediation fields due to its high purity,uniform and controllable particle size characteristics.Taking the barium sulfate homogeneous precipitation process investigation experiment from undergraduate teaching laboratories as an example,this study guides students to explore two proposed reaction mechanisms:the acid-driven mechanism and oxidation-driven mechanism of(NH₄)₂S₂O₈ hydrolysis products during the barium sulfate homogeneous precipitation reaction.Students independently design controlled-variable experiments to analyze and verify the synergistic regulation of dual mechanisms in precipitation processes.Practical results demonstrate that through establishing an inquiry-based scientific training system following the“problem identification-hypothesis formulation-experimental design-investigation-conclusion analysis”framework,and implementing progressive teaching practices of“fundamental experiments-extended exploration”,we effectively promote the advancement of students’ higher-order cognitive thinking and better prepare them for engagement in scientific research and innovation.

The determination of the composition and formation constant of cerium(Ⅳ)-ethanol complex is one of the classic physical chemistry experiments.In light of the issues identified in experimental teaching,the influences of the excess amount of ethanol,the extrapolation method for initial absorbance,and the nitric acid concentration on the experiment were further discussed based on the original experiment.The results demonstrated that moderately increasing the excess level of ethanol enhanced the accuracy of experimental data,while employing a linear extrapolation of absorbance versus time to determine the initial absorbance proved more straightforward and rational.Furthermore,moderately reducing the nitric acid concentration still satisfied the experimental requirements.Based on these findings,improvements to the original experimental protocol were proposed.

The construction of the curriculum group for the pharmacy major in higher vocational colleges,faced by the poor systematization and synergy among curriculums and insufficient cultivation of abilities,makes it hard to train applied talents featuring knowledge connection and ability integration,two core requirements of China’s industry of developing new drugs for vocational education in its transformation.The construction of the cube-styled curriculum group based on the CBE concept can achieve the“ability integration”teaching objective of the curriculum cube,in that it proceeds from the job competency requirements,builds the“curriculum cube”into the curriculum group as the smallest constituent unit through the deep coupling of multiple curriculums,and realizes the systematic collaboration of internal curriculums by means of comprehensive practical projects as the driver.By basing the construction of the cube-styled curriculum group on three dimensions,namely the curriculum cube framework,the integrated support system for teaching,learning and assessment,and the curriculum group guarantee system,coupled with the description of the specific construction process of the curriculum cube for the drug inspection position,this paper is of reference significance for the construction of vocational education curriculum group.

This study proposes an innovative pedagogical mode that utilizes high-profile bridge collapse incidents as a pedagogical entry point to introduce metallic corrosion phenomena.The curriculum reveals the fundamental principles of electrochemical corrosion mechanisms,and enables students to systematically master the four characteristic features and two states of metal anode processes combined with knowledge of electrochemical sequence dynamics.Methodologically,it establishes cognitive conflict scenarios by contrasting experimental polarization curves with Tafel’s relation,thereby fostering critical thinking and scientific inquiry competencies.A scaffolded learning progression culminates in applied case analyses featuring the corrosion protection systems of the Hong Kong-Zhuhai-Macao Bridge,effectively bridging theoretical knowledge with cutting-edge engineering applications to stimulate disciplinary engagement and research-oriented thinking.The instructional design holistically incorporates ideological and political elements through powerful nation of science and technology and engineering responsibility cultivation,ultimately constructing a paradigm-shifting classroom mode that aligns with Golden Course standards(“Advanced,innovative,challenging”) in higher education.

This paper is based on the contemporary demands of the new engineering discipline construction for the reform of the higher education teaching system,taking the realistic need for the high-quality development of the food industry driven by the transformation and upgrading of China’s industries as the entry point.It faces the pain points in the current teaching of“Introduction to Food Science and Engineering”.Explore new ideas of education based on the closed-loop educational philosophy of“Student-Centered,Outcome-Based Education,Continuous Quality Improvement(SC-OBE-CQI),with the aim of achieving comprehensive improvement in multiple dimensions such as knowledge,skills,abilities,and literacy,improving teaching level and quality,and providing new reference for deepening curriculum reform and cultivation of applied talents.

Exploring intelligent chemistry experiments during undergraduate studies is beneficial for chemistry majors to consolidate their achievements in digital education,to enhance their learning interests and information capability.Here,a classical acid-base titration experiment(methyl orange as an indicator)has been selected because of its popularity and early appearance in universities.By building an intelligent titration device,and developing color recognition and automatic titration control programs,the extracted digital color features are used to drive the automatic start and stop of the stepper motor,achieving intelligent control of the two-stage titration rate from fast to slow and endpoint judgment.The parallel titration results indicate that deviation of the intelligent titration can be controlled within 0.2%,comparable to skilled manual titration.The experimental equipment,reagents,and information technology requirements are low,making it suitable for popularization and promotion as an introductory project for intelligent chemistry experiments.

To improve the teaching effectiveness of chemical engineering experiments,this paper innovatively proposes a “trinity” teaching mode integrating virtual simulation with Aspen simulation,using VOC catalytic oxidation experiments as a detailed case study.Through deep integration of virtual simulation and Aspen simulation,a closed-loop teaching mode of “theoretical prediction-operational training-experimental verification” has been constructed,overcoming the “virtual-physical disconnection” limitation in traditional chemical engineering experimental instruction.Through pre-class virtual simulation,students can familiarize themselves with the experimental process in advance and reduce operational risks.Aspen simulation,on the other hand,expands the experimental dimensions,overcoming practical device limitations in terms of temperature,pressure,etc.,enabling students to gain a deep understanding of LHHW-type reaction mechanisms.The synergistic effect of these two approaches not only enhances experimental safety and efficiency,but also strengthens students’ engineering thinking and comprehensive analysis capabilities through data cross-validation.During in-class experiments,students further verify simulation results through practical operations,comprehensively mastering the influencing patterns of VOC catalytic oxidation removal.Post-class comprehensive analysis of experimental data and simulation results reinforces students’ scientific research thinking and writing skills.Teaching practice demonstrates that this mode significantly improves students’ learning interest and comprehensive abilities,while enhancing the efficiency and safety of experimental teaching,providing new ideas for the reform of chemical engineering experimental education.

A questionnaire survey on knowledge related to significant figures was conducted among 60 teachers engaged in Analytical Chemistry instruction and 112 normal university students and 297 non-normal university students who had completed the Analytical Chemistry course in selected higher education institutions across 25 provinces,municipalities,and autonomous regions in China.The results indicate that:(1) The concept of significant figures remains ambiguous among teachers and students,where significant figures may be interpreted as either numerical values or digits;(2) The majority of respondents erroneously consider some textbook rules(already proven incorrect) to be valid;(3) Divergence exists in teachers’ and students’ understanding of the number of significant figures in measured values and their interpretations of special regulations related to significant figures;(4) Textbooks have a decisive influence on constructing teachers’ and students’ knowledge systems of significant figures.The above findings reveal the knowledge system of significant figures understood by both teachers and students exhibits significant issues,which is closely related to erroneous content regarding significant figures in Analytical Chemistry textbooks,reflecting the perpetuation of incorrect knowledge from teaching materials.It is therefore recommended to systematically review and revise the knowledge framework of significant figures in Analytical Chemistry textbooks,accompanied by simultaneous promotion of professional training for relevant instructors.

Zheng Zhenwen was a famous chemist, compiler and science educator in modern China. In the era of social upheaval and change, Zheng Zhenwen, who returned from studying abroad, enthusiastically devoted himself to the cause of science education in modern China, actively introduced western scientific achievements, compiled textbooks of science and chemistry, reviewed the Principles of Chemical Nomenclature to unify chemical nomenclature, and advocated the “Kasaijian style of learning” to revitalize the education in Fujian Province. As a pioneer of modern science education, Zheng Zhenwen always embraced the life interest of “science to save the country, education to save the country”, and in the long term of practical exploration, he built up the idea of science education which is compatible with science and art, and the integration of Chinese and western science. In the new era and new journey of building a strong educational country, contemporary science education can draw the contemporary value of Zheng’s science education practice and thought from the four dimensions of development trend, cultural pattern, value and talent orientation.

Through a historical investigation of the development of the metallic nitrogen hypothesis,it is revealed that in the early 19th century,British chemist Humphry Davy first proposed the hypothesis that nitrogen might exhibit metallic properties under extreme conditions.In 1935,American physicist Eugene Wigner systematically demonstrated the possibility of metallic nitrogen’s existence through a high-pressure phase transition theoretical model,refining Davy’s original hypothesis.Building on the continuous advancements in condensed matter physics research and breakthroughs in compression and observation technologies,in 2018,researcher Alexander Goncharov and his team at the Institute of Physics,Chinese Academy of Sciences successfully achieved controllable synthesis of metallic nitrogen using an in-situ integrated experimental system.Metallic nitrogen,as a novel energetic material with ultra-high energy density and environmentally friendly characteristics,epitomizes the scientific revolution in humanity’s quest to transcend the boundaries of material understanding under extreme temperature and pressure conditions.