Banca de DEFESA: ABRAÃO DE MATOS FEITOZA

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : ABRAÃO DE MATOS FEITOZA
DATE: 30/01/2023
TIME: 09:00
LOCAL: https://meet.google.com/aex-bvcx-kjr?pli=1&authuser=1
TITLE:

CONSTRUCTION AND APPLICATION OF A PORTOTYPE OF REACTOR USING ARDUINO PLATFORM TO DISCUSS CONCEPTS RELATED TO STOCHIOMETRY.


KEY WORDS:

Stoichiometry; Chemical reaction; Reactor with an Arduino platform.


PAGES: 100
BIG AREA: Ciências Exatas e da Terra
AREA: Química
SUMMARY:

In the process of teaching and learning chemistry, several difficulties of understanding on the part of students related to the subject of stoichiometry are observed. Among them, the lack of understanding regarding the representation of the three levels of knowledge of matter to symbolically express the occurrence of a chemical reaction, the proportionality relations between reactants and products and the recognition of different phases of matter in a reactional system, requiring students to high level of content abstraction for understanding a reactional system or phenomenon illustrating how a chemical reaction occurs. In this work, a prototype equipment for a hermetic reactor with the arduino platform (PRHA) was developed, subdivided into two stages, hardware construction, software and device testing (E1); and application in the classroom (E2), segmented into six moments allocated in five meetings: initial meeting, identification of previous ideas (M1); second meeting, instructional class and use of ball-stick models on chemical proportion (M2); third meeting, instructional class and use of ball-stick models on limiting and excess reagent (M3) and application of RHA (M5); fourth meeting, application of the PRHA (M4) and discussion about the concepts of proportion, product, reagent, chemical expression; fifth meeting, second application of PRHA (M4) addressing concepts such as limiting and excess reagent, chemical expression and chemical reaction, ending with a question about the application of PRHA and the learning possibilities that students were able to develop (M6). The proposal was applied to twenty (20) students of the 2nd year of high school at the Institute of Education of Ceará, in the city of Fortaleza-CE. The results of E1 are related to the tests performed with the RHA, they are: need to follow the information in the sensor data sheet, decrease in reaction time due to the increase in the contact surface, unstable variation of the gas concentration detected in the PRHA, and possibility of external mass exchange to the system. In the application stage, students had difficulties in conceptualizing chemical reaction, using chemical symbology as well as using the mathematical algorithm of proportion, alternative conceptions previously described in the literature were also listed, such as the idea of active and passive reagent and dissolution process as synonymous with chemical reaction, in the students’ explanations the macroscopic level prevailed, even after instruction with submicroscopic ball-stick models. The management and application of the PRHA by the students was configured as an important moment of discussion about the phenomenon under study, but even so, given the short time in which the PRHA was used, the students let the macroscopic level prevail to the detriment of the other levels of representation of chemical knowledge proposed by Johnstone (1981).


COMMITTEE MEMBERS:
Interna - 1530500 - ANA CRISTINA FACUNDO DE BRITO PONTES
Interno - 3007778 - ANDERSON DIAS VIANA
Presidente - 2525587 - CARLOS NECO DA SILVA JUNIOR
Externa à Instituição - FABIANA ROBERTA GONCALVES E SILVA HUSSEIN - UFBA
Notícia cadastrada em: 20/01/2023 09:33
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