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a.e. – almost everywhere. AFSOC - Assume for the sake of contradiction. Ai – Airy function. AL – Action limit. Alt – alternating group (Alt ( n) is also written as A n.) A.M. – arithmetic mean. AP – arithmetic progression. arccos – inverse cosine function. arccosec – inverse cosecant function.
Founded. September 2006; 17 years ago. ( 2006-09) ISSN. 1336-9776. Website. www .pluska .sk. Plus jeden deň ( lit. 'Plus One Day') is a daily newspaper in Slovak published by the company News and Media Holding.
Coincides with ISO 3166-1 alpha-2 code. Before 1922, United Kingdom of Great Britain and Ireland. Until 2021, "GB" was used, but from 28 September 2021 the United Kingdom of Great Britain and Northern Ireland changed its international vehicle registration code from "GB" to "UK".
Sodium periodate is an inorganic salt, composed of a sodium cation and the periodate anion.It may also be regarded as the sodium salt of periodic acid.Like many periodates, it can exist in two different forms: sodium metaperiodate (formula NaIO 4) and sodium orthoperiodate (normally Na 2 H 3 IO 6, but sometimes the fully reacted salt Na 5 IO 6).
H 2 Se adopts a bent structure with a H−Se−H bond angle of 91° [citation needed]. Consistent with this structure, three IR-active vibrational bands are observed: 2358, 2345, and 1034 cm −1. [6] The properties of H 2 S and H 2 Se are similar, although the selenide is more acidic with pK a = 3.89 and the second pK a = 11, [6] or 15.05 ± 0 ...
This hydrolysis occurs because of the extreme basicity of the Se 2− ion. Na 2 Se + H 2 O → NaHSe + NaOH. Similarly, sodium selenide is readily oxidized to polyselenides, a conversion signaled by off-white samples. Sodium selenide reacts with acids to produce toxic hydrogen selenide gas. Na 2 Se + 2 HCl → H 2 Se + 2 NaCl.
Sodium peroxide is an inorganic compound with the formula Na 2 O 2.This yellowish solid is the product of sodium ignited in excess oxygen. [3] It is a strong base. This metal peroxide exists in several hydrates and peroxyhydrates including Na 2 O 2 ·2H 2 O 2 ·4H 2 O, Na 2 O 2 ·2H 2 O, Na 2 O 2 ·2H 2 O 2, and Na 2 O 2 ·8H 2 O. [4] The octahydrate, which is simple to prepare, is white, in ...
Sodium hydroselenide is an inorganic compound with the chemical formula Na Se H. It is a salt of hydrogen selenide. It consist of sodium cations Na+ and hydroselenide anions −SeH. Each unit consists of one sodium, one selenium, and one hydrogen atom. Sodium hydroselenide is a selenium analog of sodium hydroxide NaOH.