Physique

Werner Israel s'étire et se détend dans la chaise du coiffeur, tout en rêvassant. Il réfléchit à sa prochaine retraite et son déménagement vers Victoria, en Colombie Britannique, pendant que la coiffeuse lui pose une cape protectrice sur les épaules qu’elle attache derrière son cou. C'est une jeune femme d'environ 20 ans,...

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On cold nights Florida farmers spray oranges with water which quickly freezes into ice on the oranges. How would this protect the oranges from freezing?

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Pushing the limits of chemistry with iridium

22 octobre, 2014

Canadian scientists working with the element iridium in Gary Schrobilgen's lab at McMaster university set a new record for the highest formal oxidation state in the periodic table of the elements. Oxidation state describes the number of electrons an atom loses or gains when it joins with other atoms in chemical compounds; the higher the oxidation state, the more electrons, critical in many applications, especially batteries. Previously the highest number was 8. Working with Chinese and German colleagues, the scientists created a gaseous form of iridium tetroxide reaching an oxidation state of 9. More at the Science Media Centre...

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