This work propose the development of an experiment that may be used for the teaching of chemistry for undergraduate students in general, using the analysis of olive oil and soybean oil toward the direct injection electrospray ionization Mass Spectrometry - DI-MS/MS with 18-crown-6 as organic modifier. Firstly, olive oil was analyzed from two different brands, one of reputed brand and the other of popular brand and lower price. Soybean oil of popular brand was also analyzed in order to search possible similarities in the components of these oils and to search adulterations of olive oil with soybean oil. The mass spectra were obtained in positive ion mode of analysis, and allowed us to observe characteristic ions of soybean oil, olive oil, and identify the adulterated olive oil. This simple experiment of easy development may be applied in any institution which has a mass spectrometer with electrospray ionization. In addition, with the use of the experiment, the teacher can illustrate general chemistry concepts such as: molecular mass, preparation of solutions, oxidation, and acid-base reactions.

O presente trabalho apresenta a descrição e resultados de uma atividade trabalhada com alunos do Ensino Médio e cujo tema abordado foram "as drogas". A ideia era que, utilizando um tema de grande repercussão e interesse dos jovens, amplamente discutido e de vasta relevância social, poder-se-ia trabalhar de maneira interdisciplinar e de forma contextualizada, contribuindo para a construção de conhecimentos relacionados ao ensino de Ciências. Nessa perspectiva, foi proposta uma sequência de atividades interdisciplinares, como pesquisas, produção de painéis e elaboração de reportagem, dentro do referido tema, que revelaram a importância da integração dos saberes e a reflexão sobre o assunto trabalhado. Os resultados obtidos mostraram que o interesse e o envolvimento dos alunos foram grandes, o que possibilitou a aquisição de aprendizagens realmente significativas.

This paper presents a description and results of an activity with high school students, whose topic was "Drugs". The idea was that, using a theme of great impact and interest to young people, which is widely discussed and of social relevance, the theme could be included in an interdisciplinary and contextualized way contributing to the construction of knowledge related to the Science teaching. Through this perspective, a series of interdisciplinary activities such as research, development and production of posters, within that theme was suggested, which revealed the importance of integration of knowledge and reflection on the subject worked on. The results showed that the interest and involvement of the students was great, which allowed the acquisition of learning to be really significant.