História da química e sua apropriação pelo currículo escrito – a noção de valência nos livros didáticos de química
Abstract
O presente trabalho examina a forma como a noção clássica de valência é apropriada pelo currículo do ensino médio de Química, através da análise de dez livros didáticos, de acordo com treze temas. Observa-se que as relações históricas de precedência são em geral negligenciadas. O modelo utilizado parece preconizar a solução de problemas matemáticos ao invés de estimular o entendimento conceitual. No entanto, foram identificadas, através das definições apresentadas pelos autores, as mesmas categorias ontológicas que foram historicamente constituídas para este conceito.
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