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By numerous discoveries in nuclear physics and by observations with telescopes and space crafts, more knowledge about the universe have been achieved in the past decades, than ever before. For chemistry the question is of relevance, how the chemical elements have been formed and are still forming. Here we are dealing with their formation in the course of the history of our universe. In the chemist's language the terms such as mass defect, nuclear binding energy, element burning, and the radioactive decay will be explained. This knowledge is required for the subsequent article about energy production by industrial and natural nuclear‐ or fission‐reactors. It is intended to address students, chemists, and teachers with this article to compensate shortcomings in chemistry textbooks.  相似文献   

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Zusammenfassung Die neueren chemischen Methoden der Aluminiumbestimmung in der Silicatanalyse werden erörtert. Für die colorimetrische Bestimmung als Hydroxychinolat in Chloroform und für die komplexometrische Bestimmung nach Extraktion mit Kupferron werden ausführliche Arbeitsvorschriften gegeben.  相似文献   

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