A aprendizagem de Química em meio a pandemia de Covid-19, período de 2021

Este trabalho apresenta um estudo de caso realizado nas disciplinas de Química Geral e Inorgânica, Química Orgânica e Fenômenos Químicos Aplicados que ocorreram no semestre B de 2021 em uma universidade comunitária. As experiências relacionam-se com aulas teóricas e práticas no período da pandemia da Covid-19. Todas elas ministradas pelo mesmo professor. Optou-se por fazer uma descrição dos resultados dos questionamentos realizados aos estudantes em uma roda de conversa. Apresenta-se a descrição dos resultados e ao finalizar a pesquisa percebe-se que os estudantes identificaram algumas fragilidades, principalmente nas aulas práticas realizadas por meio de laboratórios virtuais de aprendizagem, identificam que é uma ferramenta adequada, tratando-se da realidade de aulas remotas, mas entendem que as aulas práticas na modalidade presencial tem o seu devido valor, principalmente se tratando de Química. This work presents a case study carried out in the disciplines of General and Inorganic Chemistry, Organic Chemistry and Applied Chemical Phenomena that took place in the B semester of 2021 at a community university. The experiences are related to theoretical and practical classes during the Covid-19 pandemic period. All of them taught by the same teacher. It was decided to make a description of the results of the questions asked to students in a conversation circle. The description of the results is presented and, at the end of the research, it is clear that the students identified some weaknesses, especially in practical classes carried out through virtual learning laboratories, identifying that it is an adequate tool, considering the reality of remote classes , but they understand that the practical classes in the presential modality have their due value, especially when it comes to Chemistry.

In defence of oxidation states

In this Perspective, some of the criticisms which have been made concerning the use of oxidation states are addressed, particularly in the context of the teaching of inorganic chemistry.

DEVELOPMENT OF RESEARCH OF CHEMISTRY OF COORDINATION COMPOUNDS IN V.I. VERNADSKY INSTITUTE OF GENERAL AND INORGANIC CHEMISTRY NAS OF UKRAINE: FROM THE 30'S TWENTIETH CENTURY(part1)

The review considers the main stages of development of the chemistry of coordination compounds at the Institute of General and Inorganic Chemistry. VI Vernadsky National Academy of Sciences of Ukraine on the occasion of the 90th anniversary of its founding. An overview of complex compounds of p, d, f-me­tals with different classes of ligands (inorganic and organic), features of their synthesis, study of the structure and properties of the obtained compounds, contains current material on the use of synthesized complexes to create functional materials for different purposes. Me­thods of synthesis have been developed, do­zens of new coordination compounds with derivatives of hydrazones, amines, azomethanes, and thiosemicarbazones have been synthesized and isolated in the individual state. Their composition, structure and physicochemical pro­perties are determined. The general regularities that take place in the process of comple­xation of metals with ligands, as well as factors influencing the composition, structure and physico­chemical properties of the obtained coordination compounds are established. For the long history of the Institute has accumulated a huge amount of material on the problems of modern coordination chemistry. Significant research in this area belongs to Ukrainian scientists who have worked long and fruitfully at the Institute: A.K. Babko, K.B. Yatsimirsky, Ya.A. Fialkov, I.A. Sheka, S.V. Volkov, N.A. Kostromina, and who created scientific schools, known not only in Ukraine but also abroad. To date, the attention of scientists of the Institute has shifted from classical monomeric to bigeteronuclear, polynuclear, multiligand complexes, which is primarily due to intensive research of new functional materials: optical and magnetic, biologically active substances, as well as effective adsorbents, chemical sensors, catalysts, catalysts, catalysts and biochemical processes.

Peer-Led Team Learning and Student Success

Peer-Led Team Learning (PLTL), a nationally recognized teaching and learning model, was introduced into the General Chemistry course at Pace University in 2014. The objective of this study was to determine the effect of the introduction of PLTL on the students’ final exam scores, and through surveys, determine how students viewed both the PLTL program and their Peer Leaders. In addition, this study sought to monitor the progress of Peer Leaders as they entered an upper-level Inorganic Chemistry class to determine whether the experience of being a Peer Leader helped their success in this course. The biggest difference, when comparing exam scores from two separate years before and after PLTL implementation, was found to be 10%. However, upon averaging exam scores over several years before and after the introduction of the PLTL program, a more modest average increase of 4% was determined. It was found that students with Peer Leader experience performed better in an upper-level Inorganic Chemistry class compared to those with no Peer Leader experience. Results from surveys administered to both students and Peer Leaders regarding their experiences, as well as the results from students evaluating their Peer Leaders, are reported here. Overall, the implementation of PLTL has led to greater interactions between the Instructor, Peer Leaders, and undergraduate students, thereby furthering a greater interest in chemistry and increasing the students’ sense of community.

Research on the Technology of Recovering Low Concentration Ni+ Metal Ion Solution

Under environmentally friendly and environmental issues, wastewater treatment in laboratories and factories is an important international issue. Among them, wastewater from the chemical industry accounts for a large part of industrial wastewater discharge. The introduction of new technologies to treat chemical wastewater is of great significance. In particular, the amount of wastewater produced by inorganic chemistry experiments is relatively large, and the pollutants are mostly heavy metal salts. According to the characteristics of inorganic chemistry experimental wastewater, such as special nature, small amount, strong discontinuity, high hazard, complex and changeable composition, etc., design a chemical reaction to provide a practical and feasible method to treat wastewater with high efficiency and low cost. This research initially takes Ni+ metal ion waste liquid as the first stage of recycling and treatment to improve the traditional low-concentration non-economic treatment. The preliminary results of this research are neutralization reaction and optimal pH value control of Ni+ waste liquid to generate Ni+ precursors to increase the economic value of recycling will be the basis for providing in-house recycling systems for electroplating plants, panel plants, and semiconductor plants to achieve emission reduction, green chemical industry and green environmental protection.

EVALUATION OF THE EFFECTIVENESS OF THE USE OF DISTANCE TECHNOLOGIES FOR TEACHING INORGANIC CHEMISTRY AT SCHOOL

The article presents the results of assessing the effectiveness of distance learning of inorganic chemistry for students from school 37 in Nur-Sultan. The research was carried out at the expense of the authors' own funds. The authors partially proved the validity of the model for organizing distance learning of students and the positive impact of its pedagogical conditions. The carried out diagnostics of the effectiveness of the organization of distance learning allows to increase the level of education of students. The use of distance learning technologies gives positive results in the preparation of pedagogical personnel - chemistry teachers and in teaching students, which is very important for the development of the educational process in our country. The proposed model for organizing distance learning in inorganic chemistry at school is characterized by the integrity and interdependence of the following blocks: target, methodological, organizational, procedural, diagnostic, and the effectiveness of the results.

STARS IN THE ORIGIN AND EVOLUTION OF SPECIES

The proposed hypothesis of ‘Stars in the Origin and Evolution of Species’ is based on the principle underlying in ‘Jyotish’, one of the six Vedāngas and ancillary of most ancient Vedas of Hinduism. The principle of interaction of electromagnetic force with inorganic chemistry available to us in the universe defines life as an emergent property of matter and as the most plausible hypothesis for explaining the extra-terrestrial origin of species. The current hypothesis of evolution explains the critical milestones in the development of advanced life on Earth during the Cambrian explosion and the complexity of life when humans appeared on earth endowed with a brain of extraordinary intellectual capacities and capabilities which is far more complex than the animal brain and its development in stages is also observed as a plausible mechanism in tune with the phases of elements given out by the stars during their life cycles.

Insight into Recent Drug Discoveries against Trypanosomatids and Plasmodium spp Parasites: New Metal-based Compounds

: Scaffolds of metal-based compounds can act as pharmacophore groups in several ligands to treat various diseases, including tropical infectious diseases (TID). In this review article, we investigate the contribution of these moieties to medicinal inorganic chemistry in the last seven years against TID, including American trypanosomiasis (Chagas disease), human African trypanosomiasis (HAT, sleeping sickness), leishmania, and malaria. The most potent metal-based complexes are displayed and highlighted in figures, tables and graphics; according to their pharmacological activities (IC50 > 10µM) against Trypanosomatids and Plasmodium spp parasites. We highlight the current progresses and viewpoints of these metal-based complexes, with a specific focus on drug discovery.