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Topic: Hydride


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In the News (Sat 20 Jul 19)

  
  Hydride - Wikipedia, the free encyclopedia
In main group element hydrides electronegativity of an element respective to hydrogen determines the compound to be either of the first two types.
Ionic hydrides are usually used as reducing agents in synthetic chemistry, but they are too strongly basic and reactive to be used in pure form.
Covalent hydrides behave as molecules with the weak London forces and hence are volatile at room temperature and atmospheric pressure.
en.wikipedia.org /wiki/Hydride   (977 words)

  
 Nickel metal hydride battery - Wikipedia, the free encyclopedia
A nickel metal hydride (or NiMH) battery is a type of rechargeable battery similar to a nickel-cadmium (NiCad) battery but which does not contain expensive (and environmentally risky) cadmium.
Higher-capacity "multi-component" electrodes are based on AB compounds, where A is titanium and/or vanadium and B is zirconium or nickel, modified with chromium, cobalt, iron, and/or manganese [1].
When hydrogen ions are forced out of the potassium hydroxide electrolyte solution by the voltage applied during charging, this process prevents them from forming a gas, allowing a low pressure and volume to be maintained.
en.wikipedia.org /wiki/Nickel_metal_hydride   (837 words)

  
 Organometallic HyperTextBook: Hydride Complexes
The hydride ligand itself need not be hydridic in nature, but can in fact vary in nature from acidic to hydridic depending on the nature of the metal center to which it is attached.
Hydrides are usually easy to see in the proton NMR as their proximity to the metal causes large shieldings or deshieldings.
There can be problems observing hydrides when the molecule is fluxional or the hydride is attached to one or metal centers with large quadrapole moments.
www.ilpi.com /organomet/hydride.html   (491 words)

  
 VirtualHealthInfo.com   (Site not responding. Last check: 2007-10-08)
A recent study was conducted to investigate silica hydride as a potential alternative hydrogen energy source for use in a variety of venues including pharmacology.
A study was conducted to describe the synthesis of silica hydride from a class of compounds with the general formula (RsiO 1.5) n.
Silica hydride is the first of several newly synthesized compounds from a hydride family.
www.virtualhealthinfo.com /news_silicahydride.shtml   (422 words)

  
 HHMI Lab Safety: LCSS: POTASSIUM HYDRIDE AND SODIUM HYDRIDE   (Site not responding. Last check: 2007-10-08)
Sodium hydride and potassium hydride fires must be extinguished with a class D dry chemical extinguisher or by the use of sand, ground limestone, dry clay or graphite, or "Met-L-X®" type solids.
Oil dispersions of these hydrides are much safer to handle because the mineral oil serves as a barrier to moisture and air.
Sodium hydride and potassium hydride should be handled in the laboratory using the "basic prudent practices" described in Chapter 5.C, supplemented by the additional precautions for work with flammable (Chapter 5.F) and highly reactive (Chapter 5.G) substances.
www.hhmi.org /about/labsafe/lcss/lcss74.html   (686 words)

  
 Hydride Basics
Typical metal hydrides are powders whose particles are only a few millionths of a meter (microns) across.
The absorption and release of hydrogen from a metal hydride is similar to the storage and withdrawal of electricity from a battery.
The relationship between hydrogen pressure and rates of charging and discharging is important in using metal hydrides for hydrogen storage.
www.hydrogencomponents.com /hydride.html   (643 words)

  
 Silica hydride   (Site not responding. Last check: 2007-10-08)
Silica hydride is a colloidal mineral compound containing silicon, oxygen, and hydrogen.
However, whether silica hydride can be absorbed from the gastrointestinal tract and whether it will affect the health of animals or humans has not been adequately tested.
Due to the lack of published scientific research on silica hydride in animals or humans, side effects and interactions are unknown.
www.gnc.co.uk /VF/HealthNotes/HN_live_uk/Supp/Silica_Hydride.htm   (490 words)

  
 hydride --  Britannica Concise Encyclopedia - The online encyclopedia you can trust!
Those hydrides give off large amounts of energy when burned and may be useful as rocket fuels.
The hydride ion itself is symbolized by H, which could lead to the conclusion that hydrogen, at least in some instances, should be classified with the halogens (which form X ions), just as its tendency to form H+ likens it to the alkali metals (which form M+ ions).
The saline hydrides are generally considered those of the alkali metals and the alkaline earth metals (with the possible exception of beryllium hydride, BeH2, and magnesium hydride, MgH2).
www.britannica.com /ebc/article-9367652?tocId=9367652   (474 words)

  
 Hydride Thermo
Metal hydrides are compounds formed by reactions of metals with hydrogen.
At the midpoint of the hydride plateau (H/M = 0.5) in Figure 3, we have hydrogen in the gaseous phase and two distinct solid phases-hydrogen saturated metal and metal hydride.
At the left edge of the plateau, crystals of hydride begin to form (nucleate) at distinct locations on the surfaces and in grain boundaries of the metal crystals.
www.hydrogencomponents.com /thermo.html   (2349 words)

  
 Arsenic Analysis and Speciation by ICPMS
The traditional hydride generation AA method uses this chemistry to determine arsenic.
However, the batch wise production of the hydride is not a precise technique, therefore most laboratories favor the furnace (GFAA) method of analysis for this reason.
Because DMA and MMA also form volatile hydrides, this speciation technique should not be used when these species may be present.
www.wcaslab.com /tech/arsenic.htm   (706 words)

  
 Voltage of a Nickel Metal Hydride Battery
A nickel metal hydride battery is a new type of battery invented in 1992.
Nickel metal hydride batteries were developed to meet the requirement for increasingly higher levels of energy demanded by today's electronic products; for example: cell phones, CD players, mini disc players, and laptop computers.
A standard nickel metal hydride battery can produced up to 1.35 volts, but usually operates at around 1.2 volts.
hypertextbook.com /facts/2001/AlanLeung.shtml   (253 words)

  
 THE AMAZING METAL SPONGE: Simulations of Palladium-Hydride
Better understanding of what happens at the molecular level, such as phase changes that occur as hydrogen fills the metal -- forming a metal hydride -- and the effect of defects in the material, could give clues to designing metal hydrides that perform better.
Such research also bears directly on technologies that use metal hydrides in fuel cells and batteries.
Onset of the beta phase in palladium hydride at 300 degrees Kelvin.
www.psc.edu /science/Wolf/Wolf.html   (494 words)

  
 Nickel-Metal Hydride Batteries
The Nickel-Metal Hydride (NiMH) battery was introduced as another option to the Nickel-Cadmium batteries.
They differ from Ni-Cds, however, in that they are capable of a higher capacity without developing what is often referred to as the Ni-Cd Memory Issue.
The main difference between these two battery types is the substitution of a metal hydride instead of cadmium.
support.radioshack.com /support_tutorials/batteries/bt-nimh-main.htm   (236 words)

  
 Organometallic HyperTextBook: Beta-Hydride Elimination   (Site not responding. Last check: 2007-10-08)
The reaction is simply the transfer of a hydride (hydrogen atom) from the beta-position on a ligand to the metal center.
The mechanism shown indicates a four-center transition state in which the hydride is transferred to the metal.
In some cases, the unsaturated fragment that is formed will remain bound to the metal and in other cases it will either not bind or be displaced by a stronger donor ligand.
www.ilpi.com /organomet/betahydride.html   (329 words)

  
 The Ovonic Metal Hydride Fuel Cell is a fundamentally new approach to fuel cell technology because it has intrinsic ...
The Ovonic Metal Hydride Fuel Cell is a fundamentally new approach to fuel cell technology because it has intrinsic energy storage capability that provides unique performance advantages
Ovonic Fuel Cell Company's mission is to develop and commercialize the Ovonic® Metal Hydride Fuel Cell, a fundamentally new approach that provides intrinsic energy storage within the fuel cell stack.
The Ovonic® Metal Hydride Fuel Cell is very practical because it only uses low-cost components.
www.ovonic.com /sol_srv/3_2_fuel_cell_sol/fuel_cel_solutions.htm   (274 words)

  
 Metal hydride materials contract signed
Certain metals and alloys form unstable hydrides, meaning that they can absorb hydrogen and then release it when heated.
Rare earths, nickel, zirconium and titanium are the alloy components most commonly used in nickel metal-hydride (NiMH) batteries.
Pure magnesium, on the other hand, is a very lightweight metal that can store about 6.5 percent hydrogen by weight.
www.ameslab.gov /news/release/hydride.html   (832 words)

  
 Quest Nickel Metal Hydride (NiMH) Batteries
Charge from one to four cells at a time.Quest® rechargeable batteries are an environmentally friendly, high capacity energy source that run twice as long as Nicd with
Quest® rechargeable batteries are an environmentally friendly, high capacity energy source that run twice as long as Nicd with no memory effect.
Use the Quest® 8 Hour Nickel Metal Hydride (NiMH) charger to charge two or four AAA Quest® Nickel Metal Hydride (NiMH) rechargeable batteries.
www.d-store.com /d-store/product/quest.htm   (649 words)

  
 Amazon.com: Panasonic EY9200B 12-Volt Nickel Metal Hydride Battery: Tools & Hardware   (Site not responding. Last check: 2007-10-08)
12-volt nickel metal hydride battery for use with the Panasonic 12-volt, 1/2-inch cordless Hyperformance drill.
We did these one at a time, as we have three of the 3/8" drills and three of the chargers.
Panasonic should have offered a deal for the new 12 volt drills where you could pay extra and get two metal-hydride batteries instead of the two ni-cads for $40.00 more.
www.amazon.com /exec/obidos/tg/detail/-/B0000226A8?v=glance   (1120 words)

  
 Robust metal hydride hydrogen storage system (US5697221)
A modular metal hydride hydrogen storage system which can provide a robust and reliable source of hydrogen that can quickly and easily be modified for a variety of applications and environments.
Each storage module comprises a container for storing metal hydride and gaseous hydrogen, and an adapter for connecting storage modules together end-to-end to form a connected sequence of storage modules.
a passage tube positioned in said container and surrounded by said metal hydride, said passage tube gaseously connected to said passage port:
www.delphion.com /details?pn=US05697221__   (298 words)

  
 CALCIUM HYDRIDE
Explosions may occur from heating the hydride itself, from reactions with oxidizing substances and from the release of hydrogen.
Dust dispersed in air may present a dust explosion hazard.
Whatever cannot be saved for recovery or recycling should be handled as hazardous waste and sent to a RCRA approved waste facility.
www.jtbaker.com /msds/englishhtml/c0396.htm   (1033 words)

  
 Chemistry : Periodic Table : gallium : compound data [gallium (III) hydride]   (Site not responding. Last check: 2007-10-08)
Chemistry: WebElements Periodic Table: Professional Edition: Gallium: compound data [gallium (III) hydride]
For each compound, and where possible, a formal oxidation number for each element is given, but the usefulness of this number is limited, especially so for p-block elements in particular.
Copyright 1993-2003 Mark Winter [The University of Sheffield and WebElements Ltd, UK].
www.webelements.com /webelements/compounds/text/Ga/Ga2H6-13572935.html   (310 words)

  
 Amazon.com: DR-31 Nickel-Metal Hydride Laptop Battery: Electronics   (Site not responding. Last check: 2007-10-08)
The Nickel-Metal Hydride (NiMH) laptop batteries meet or exceed original battery standards at a fraction of the cost.
Made with the highest quality cells, these batteries offer reliable performance and long battery life.
Your comments can help make our site better for everyone.
www.amazon.com /exec/obidos/tg/detail/-/B0002IYMDG?v=glance   (312 words)

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