Download 100 Chemical Myths: Misconceptions, Misunderstandings, by Lajos Kovács, Dezső Csupor, Gábor Lente, Tamás Gunda PDF

By Lajos Kovács, Dezső Csupor, Gábor Lente, Tamás Gunda

ISBN-10: 3319084186

ISBN-13: 9783319084183

ISBN-10: 3319084194

ISBN-13: 9783319084190

100 Chemical Myths bargains with renowned but mostly unfaithful misconceptions and misunderstandings concerning chemistry. It comprises lucid and concise reasons reduce via fallacies and concrete legends which are universally suitable to an international viewers. quite a lot of chemical myths are explored in those components; nutrients, medications, catastrophes, chemical compounds, and environmental difficulties. Connections to pop culture, literature, video clips, and cultural heritage carry the reader’s curiosity when key suggestions are superbly annotated with illustrations to facilitate the knowledge of unusual fabric. Chemical Myths Demystified is pitched to participants and not using a formal chemistry historical past to fledgling undergraduate chemists to pro researchers and beyond.

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Extra resources for 100 Chemical Myths: Misconceptions, Misunderstandings, Explanations

Sample text

A closer look at the 1904 system reveals that two elements lighter than hydrogen were also predicted: these are elements x and y. Mendeleev put both of them into the group of noble gases above helium. He thought that element x was ether, which was thought to be an actual material by physicists, and referred to element y by several different names, of which coronium was the most common. In 1904, barely a decade had passed since the discovery of the first noble gas, so it was logical for Mendeleev to assume that there were still undiscovered elements in this group, and they do not necessarily occur on Earth.

This is different from earlier practice as the investigations are not the responsibility of the regulatory agencies, but the producers, so the results must be publically disclosed. There are four different ways a chemical may appear: (a) through a transformation of another chemical (this could be a useful product or waste); (b) through import for a substance that was not used in Europe earlier; (c) through isolation from natural sources (mining, harvesting, butchering, etc. g. waste) that is not liable to REACH, but the substance is re-introduced into the product cycle.

American mechanical engineer and chemist Thomas Midgley made an important discovery in 1921: tetraethyl lead, an organic compound of the metal, significantly improved the performance of gasoline engines, as it inhibited the phenomenon of “knocking”. Subsequently, leaded gasoline became quite common by the 1960s. Today only lead-free gasoline is sold at the pumps. Phasing out tetraethyl lead was a major step in decreasing human lead exposure. Nevertheless, the primary rationale for this was not to reduce health risk.

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100 Chemical Myths: Misconceptions, Misunderstandings, Explanations by Lajos Kovács, Dezső Csupor, Gábor Lente, Tamás Gunda

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