Licenciatura em Química (UAST)
URI permanente desta comunidadehttps://arandu.ufrpe.br/handle/123456789/2945
Siglas das Coleções:
APP - Artigo Publicado em Periódico
TAE - Trabalho Apresentado em Evento
TCC - Trabalho de Conclusão de Curso
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Resultados da Pesquisa
Item A experimentação no ensino de química: reflexões a partir dos artigos publicados na seção “experimentação no ensino de química” da Revista Química Nova na Escola no período de 2014-2018(2019) Santos, Cristiane da Silva; Silva, Cristiane Martins da; Bezerra, Bruna Herculano da Silva; http://lattes.cnpq.br/1039531472437739; http://lattes.cnpq.br/1000796161353860This study aims to analyze the main trends regarding the types of experiments present in the articles of the journal Química Nova in the School between the years 2014 to 2018. For this, a search was made in the section on experimentation in the teaching of chemistry, seeking to classify the type experiment was present in the journal. The types of experiments were classified according to Oliveira (2010), which contributes to identify that most of the articles bring proposals of experiments with materials of low cost, and of easy access that can be used by the teacher in high school.Item Estudo computacional das reações SN2 e E2: efeito do impedimento estérico do substrato e nucleófilo(2017) Carvalho Júnior, Jailson Alves de; Souza, Túlio Ricardo Couto de Lima; http://lattes.cnpq.br/8553398552801408; http://lattes.cnpq.br/5851976775229056Reactions SN2 and E2 are typical reactions of organic chemistry and there are a multitude of reactions in this segment, these are presented as fundamental in the synthesis, both in industry and in nature. And based on these utilities, we will show here the influence of some variables such as substrate, nucleophile and solvent will favor one of the two reactions, although they occur simultaneously, but with predominance of one over the other in all cases. Thus, in the present work two theoretical computational methods were developed with the aid of the GAUSSIAN 5.0.8 programfor the kinetic and thermodynamic study of these reactions, as well as the ideal conditions for their occurrence. In the first part of the study, there was a relative comparison between the two reactions at the semiempirical level AM1 and PM6, in the two methods the E2 reactions did not have expected behavior for the primary alkyl halides, whereas SN2 in the AM1 method also caused anomalous results, but In the PM6 method was presented as expected. Thus the study of the E2 reactions was terminated. The second part of the study was focused only on the SN2 reactions, in which several experiments were performed with different electrophiles and nucleophiles simulating an implicit methanol solvate medium (IEFPCM) at semiempirical PM6 level. The results were optimistic and corresponded to the expectations of the study, where factors such as steric effects on the electrophile, nucleophile and reactive medium had positive influences on the final result, following a tendency of reactivity imposed by experimental analyzes.