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Fronts Quimica 3 Feltre LA 14/06/2005 11 :14 Page 1 Ricardo Feltre Engenheiro Químico pela Escola Politécnica da Universidade de São Paulo. Em todos os capítulos foram colocados, em muitas opor- tunidades, boxes com curiosidades e aplicações da Química, pequenas biografias de cientistas, sugestões de atividades práticas e leituras. Algumas considerações sobre a análise orgânica, 8 Atividades práticas, 8 Revisão, 9 Exercícios, 9 Exercícios complementares, 1 1 6. Classificação dos átomos de carbono em uma cadeia, 15 Revisão, 16 Exercícios, 1 6 8. Por isso, costuma-se calcular a porcentagem do oxigênio "por diferença".
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