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This compound can be prepared by heating zirconium metal and an excess of iodine. [1] The solid is purified by sublimation (400 °C, 10-4 mm Hg). [4] 2 I 2 + Zr → ZrI 4. Pyrolysis of zirconium(IV) iodide gas by contact with a hot wire was the first industrial process for the commercial production of pure ductile metallic zirconium.
Dark green crystals of nickelocene, sublimed and freshly deposited on a cold finger Sublimation of iodine. Sublimation is the transition of a substance directly from the solid to the gas state, without passing through the liquid state. [1] The verb form of sublimation is sublime, or less preferably, sublimate. [2]
This is an accepted version of this page This is the latest accepted revision, reviewed on 25 February 2025. This article is about the chemical element. For other uses, see Iodine (disambiguation). Chemical element with atomic number 53 (I) Iodine, 53 I Iodine Pronunciation / ˈ aɪ ə d aɪ n, - d ɪ n, - d iː n / (EYE -ə-dyne, -din, -deen) Appearance lustrous metallic gray solid ...
In thermodynamics, the enthalpy of sublimation, or heat of sublimation, is the heat required to sublimate (change from solid to gas) one mole of a substance at a given combination of temperature and pressure, usually standard temperature and pressure (STP). It is equal to the cohesive energy of the solid.
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Compounds with iodine in formal oxidation state −1 are called iodides. In everyday life, iodide is most commonly encountered as a component of iodized salt , which many governments mandate. Worldwide, iodine deficiency affects two billion people and is the leading preventable cause of intellectual disability .
Sodium iodide (chemical formula NaI) is an ionic compound formed from the chemical reaction of sodium metal and iodine. Under standard conditions, it is a white, water-soluble solid comprising a 1:1 mix of sodium cations (Na +) and iodide anions (I −) in a crystal lattice. It is used mainly as a nutritional supplement and in organic chemistry.
The compound can also be synthesized by reacting iodine vapor with molten lead between 500 and 700 °C. [18] A thin film of PbI 2 can also be prepared by depositing a film of lead sulfide PbS and exposing it to iodine vapor, by the reaction PbS + I 2 → PbI 2 + S. The sulfur is then washed with dimethyl sulfoxide. [19]