• A large number of metals, sodium hydroxide, chlorine, fluorine and many other chemicals are produced by electrochemical methods. (philoid.com)
  • Hydrogen gas was first artificially produced in the early 16th century by the reaction of acids on metals. (wikipedia.org)
  • Hydrogen atoms may embrittle metals. (wikipedia.org)
  • The hydrogen autoignition temperature, the temperature of spontaneous ignition in air, is 500 °C (932 °F). Pure hydrogen-oxygen flames emit ultraviolet light and with high oxygen mix are nearly invisible to the naked eye, as illustrated by the faint plume of the Space Shuttle Main Engine, compared to the highly visible plume of a Space Shuttle Solid Rocket Booster, which uses an ammonium perchlorate composite. (wikipedia.org)
  • Most of the hydrogen on Earth exists in molecular forms such as water and organic compounds. (wikipedia.org)
  • Hydrogen is nonmetallic (except when it becomes metallic at extremely high pressures) and readily forms a single covalent bond with most nonmetallic elements, forming compounds such as water and nearly all organic compounds. (wikipedia.org)
  • When hydrogen is consumed in fuel cells, the only emission at the point of use is water vapour. (wikipedia.org)
  • Acid water can be naturally occurring, or caused by a high level of dissolved oxygen. (dewdon.com)
  • This material is widely used as a binder in the production of concrete, reinforced concrete and various construction mixes. (globecore.com)
  • Most hydrogen is used near the site of its production, the two largest uses being fossil fuel processing (e.g., hydrocracking) and ammonia production. (wikipedia.org)
  • Its reactive nature makes it useful as a catalyst or additive in chemical mixtures, including ammonium nitrate explosives, to enhance blast power. (scientificlib.com)
  • Hydrogen is the most abundant chemical substance in the universe, constituting roughly 75% of all normal matter. (wikipedia.org)
  • Aluminium is the most abundant metal in the Earth's crust, and the third most abundant element therein, after oxygen and silicon. (scientificlib.com)
  • In the Earth's crust, aluminium is the most abundant (8.3% by weight) metallic element and the third most abundant of all elements (after oxygen and silicon). (scientificlib.com)
  • Most of the hydrogen on Earth exists in molecular forms such as water and organic compounds. (wikipedia.org)
  • Hydrogen is nonmetallic (except when it becomes metallic at extremely high pressures) and readily forms a single covalent bond with most nonmetallic elements, forming compounds such as water and nearly all organic compounds. (wikipedia.org)
  • In ionic compounds, hydrogen can take the form of a negative charge (i.e., anion) where it is known as a hydride, or as a positively charged (i.e., cation) species denoted by the symbol H+. (wikipedia.org)
  • The H+ cation is simply a proton (symbol p) but its behavior in aqueous solutions and in ionic compounds involves screening of its electric charge by nearby polar molecules or anions. (wikipedia.org)
  • This class of compounds includes a broad variety of simple ammonium salts and derivatives. (nih.gov)
  • use QUATERNARY AMMONIUM COMPOUNDS 2006-2013 MH - Ammonium Hydroxide UI - D064753 MN - D1.455.212 MN - D1.625.62.311 MS - The hydroxy salt of ammonium ion. (nih.gov)
  • Hydrogen is the chemical element with the symbol H and atomic number 1. (wikipedia.org)
  • Because hydrogen is the only neutral atom for which the Schrödinger equation can be solved analytically, the study of its energetics and chemical bonding has played a key role in the development of quantum mechanics. (wikipedia.org)
  • The pH of a solution is a measure of the activity of hydrogen ions (H+) in that solution. (dewdon.com)
  • The hydrogen autoignition temperature, the temperature of spontaneous ignition in air, is 500 °C (932 °F). Pure hydrogen-oxygen flames emit ultraviolet light and with high oxygen mix are nearly invisible to the naked eye, as illustrated by the faint plume of the Space Shuttle Main Engine, compared to the highly visible plume of a Space Shuttle Solid Rocket Booster, which uses an ammonium perchlorate composite. (wikipedia.org)