Educacion Quimica最新文献

This is an example of how to use the subject in the classroom to motivate students about the study of materials. With materials, communication between humans has been completely changed. The idea is to link materials with their lifes like celular phones.

Further discussion on the use of the Green Star holistic metric for evaluation of the chemical greenness is presented, based on a preliminary evaluation of chemistry teaching books used in Brazil. The relative nature of the chemistry greenness is discussed, stressing that it depends on the context of the laboratory experiment, for instance, the source of a reagent may alter its level. It is concluded that in the academic training of chemistry teachers explicit attention should be paid to the evaluation of the environmental dimension of the laboratory activities.

This work deals the development of a catalytic system for the N‐arylation of imidazole with CuI through experimental design. 1,10‐Phenanthroline (bidentate ligand) was used and proved to be efficient in the coupling of iodo‐ and bromoarenes with imidazole. Thus, the article presented here is intended to serve as a tutorial for optimization of new catalytic systems and may be applied as a low‐cost practical class for chemistry undergraduate students.

Science has been taught and understood by students as a result of events in linear time, successive and interrelated. This way of thinking about the scientific work has led to the misunderstanding of the nature of science. To contribute to combat this distortion in the perception of science, this study aims to report a literature review on the concepts of acids and bases, starting from the analysis of the progress of these theories in history, especially in the nineteenth and twentieth century. The progress of these theories is represented by means of a chronological map that interrelates the scientific research lines of the main researchers that have developed theories that area. The chronological map aims to be an effective teaching tool to illustrate the evolution of science in the development of acid‐base theories. It may be used in the classroom by allowing students to understand the connections of scientific theories and analyze the profile of developments in scientific work.

Antimony triiodide is a versatile compound that is not studied in detail in the current Inorganic Chemistry literature at the undergraduate level. In this work we propose a simple microscale synthesis describing two other interesting properties which are not reported in the common chemical literature: photo-oxidation and acid–base reaction in non-aqueous media. The experiment can be successfully and safely achieved in a two-hour lab class at the sophomore level.

The Nobel Prize in Chemistry 2016 was awarded to Jean-Pierre Sauvage, Sir J. Fraser Stoddart and Bernard L. Feringa ‘for the design and synthesis of molecular machines’. To understand molecular machines it is important to know about supramolecular chemistry, that was developed by Donald J. Cram, Jean-Marie Lehn and Charles J. Pedersen, also Nobel Prize winners in 1987. For molecular machines, the main issue is the bond between molecules that is very weak. In this paper, a brief description of the molecular machines is presented.

Today, molecular viewers are an undeniable reality in the classroom. This type of softwares allow students the 3 dimensional development. In this study, free access molecular viewer Avogadro was used. The using of the program was successful not only in the 3 dimensional training, but in the pointing out of carbons’ quilarity of optical isomers. In fact, the velocity was reduced to a half part in comparison to bidimensional molecules. On the other hand, students were prone to the usage of Avogadro in basic and advanced chemical courses.

This is an example of how to use the subject in the classroom to develop or reinforce students’ knowledge of intermolecular forces, their origin and their consequences on the properties of materials.

We present an experience in which we analyze the perceptions of students about the flipped classroom methodology for teaching on advanced techniques in laboratories of residues of veterinary drugs and contaminants. It was conducted with 31 participants, professionals from different areas, in a professional qualification course for laboratory technicians in Spain under the model flipped classrooms. We analyze the feedback from participants on the usefulness of the resources used and the methodology followed. The results show that conceptions of participants on learning influence on assessment and acceptance of this methodology.

An investigation about usefulness of chemistry in engineering students formation according to their perception is shown. In particular, it is intended to discover how useful Chemistry is for first year Bachelor of Mechanical Engineering students and how to help students improve their views on the usefulness of chemistry. It has carried out a teaching proposal into 2 groups and then, the results were compared with another group, which has not been done this teaching proposal. The assessments and justifications of the students about the usefulness of chemistry were obtained at the beginning and end of the course, through a task that should be noted in a Likert scale of 1 to 4 and an open question to give reasons for its assessment. It was found differences in the assessment of the usefulness of chemistry between the groups which have participated in the teaching proposal and another one, which has not participated in it. It also found a strong agreement between ratings on a Likert scale and justifications provided. The results support the teaching proposal, showing the importance of the usefulness of chemistry for their training and professional future, although it is considered necessary to further this line.