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Topic: Hydrogen


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In the News (Sun 19 Nov 17)

  
  Chemistry : Periodic Table : hydrogen : key information
Hydrogen gas was used in lighter-than-air balloons for transport but is far too dangerous because of the fire risk (Hindenburg).
In the laboratory, small amounts of hydrogen gas may be made by the reaction of calcium hydride with water.
In both these cases, further hydrogen may be made by passing the CO and steam over hot (400°C) iron oxide or cobalt oxide.
www.webelements.com /webelements/elements/text/H/key.html   (392 words)

  
  Hydrogen (H) - Chemical properties, Health and Environmental effects
Huge quantities of hydrogen are used as rocket fuels, in combination with oxygen or fluor, and as a rocket propellent propelled by nuclear energy.
Hydrogen fuel cells are being looked into as a way to provide power and research is being conducted on hydrogen as a possible major future fuel.
Hydrogen reacts with oxygen to form water and this reaction is extraordinarily slow at ambient temperature; but if it’s accelerated by a catalyser, like platinum, or an electric spark, it’s made with explosive violence.
www.lenntech.com /Periodic-chart-elements/H-en.htm   (965 words)

  
 Hydrogen.gov
Hydrogen.gov is the web portal to information about Federal government activities related to hydrogen and fuel cells and is an activity of the Interagency Working Group on Hydrogen and Fuel Cells.
The Working Group encourages greater collaboration and sharing of information about hydrogen and fuel cell technology development activities among Federal agencies, as well as commercial entities; state, regional, and international organizations; and the public.
To submit comments or questions about hydrogen, fuel cells, and related technologies or issues, please refer to the specific Federal Agencies and Departments identified on the Federal Activities page of this web site.
www.hydrogen.gov   (213 words)

  
 BMW World - BMW Hydrogen Cars
Hydrogen as a motor fuel is the answer to many environmental problems since there are no harmful emissions, no depleting of resources, no danger to the atmosphere, and it can be produced from a variety of renewable resources.
The BMW solution is a Clean Energy system where liquid hydrogen is produced from water using solar power, the hydrogen is dispensed from automated filling stations and it powers modified BMW production vehicles.
Their first hydrogen car was the BMW 750hL hydrogen powered vehicle.
www.bmwworld.com /hydrogen   (417 words)

  
  NREL: Hydrogen and Fuel Cells Research Home Page
Hydrogen is the simplest and most abundant element in the universe.
Hydrogen can be produced from a wide variety of domestic resources using a number of different technologies.
The Hydrogen Technologies and Systems Group of the Hydrogen Technologies and Systems Center coordinates and integrates NREL's hydrogen and fuel cell research activities, and works with DOE and other government agencies, industry, communities, universities, and other national labs to implement the National Hydrogen Energy Vision for America's clean and secure energy future.
www.nrel.gov /hydrogen   (272 words)

  
  Hydrogen - Wikipedia, the free encyclopedia
Hydrogen (Latin: 'hydrogenium', from Ancient Greek: hydro: "water" and genes: "forming") is a chemical element in the periodic table that has the symbol H and atomic number 1.
Hydrogen forms hydrides with all main group elements with the exception of the noble gases and indium and thallium.
Deuterium, an isotope of hydrogen (hydrogen-2), is used in nuclear fission applications as a moderator to slow neutrons, and in nuclear fusion reactions.
en.wikipedia.org /wiki/Hydrogen   (3604 words)

  
 Hydrogen - MSN Encarta
Hydrogen is the first element in the periodic table of the elements and is represented by the symbol H (see Periodic Law).
Hydrogen accounts for about 73 percent of the observed mass of the universe and is the most common element in the universe.
Hydrogen is usually listed in the periodic table in the first column, with the elements called alkali metals (the elements lithium, sodium, potassium, rubidium, cesium, and francium).
encarta.msn.com /encyclopedia_761552913/Hydrogen.html   (2324 words)

  
 Hydrogen   (Site not responding. Last check: )
Hydrogen is the most abundant of all elements in the universe, and it is thought that the heavier elements were, and still are, being built from hydrogen and helium.
On earth, hydrogen occurs chiefly in combination with oxygen in water, but it is also present in organic matter such as living plants, petroleum, coal, etc. It is present as the free element in the atmosphere, but only to the extent of less than 1 ppm by volume.
Quite apart from isotopes, it has been shown that hydrogen gas under ordinary conditions is a mixture of two kinds of molecules, known as ortho- and para-hydrogen, which differ from one another by the spins of their electrons and nuclei.
www.scescape.net /~woods/elements/hydrogen.html   (914 words)

  
 Hydrogen   (Site not responding. Last check: )
The preparation of hydrogen gas is usually from a reduction of a compound containing hydrogen that is in the +1 oxidation state.
Hydrogen does not itself support combustion, as may be shown by passing a lighted taper into an inverted jar of hydrogen, when the taper is extinguished.
Hydrogen is also evolved at the anode in the electrolysis of a solution of calcium hydride, in fused mixture of potassium chloride and lithium chloride.
www.ucc.ie /ucc/depts/chem/dolchem/html/elem/elem001.html   (1157 words)

  
 Hydrogen   (Site not responding. Last check: )
Hydrogen could be used a lot more in the future if enough funding is given to use a hydrogen based society.
Hydrogen is the first element on the periodic table.
Hydrogen was discovered in 1766 by Henry Cavendish in England.
www.mvschools.org /ms/projects/html/black/hydrogen.htm   (395 words)

  
 ATSDR - MMG: Hydrogen Sulfide
Hydrogen sulfide is produced naturally by decaying organic matter and is released from sewage sludge, liquid manure, sulfur hot springs, and natural gas.
Hydrogen sulfide is used to produce elemental sulfur, sulfuric acid, and heavy water for nuclear reactors.
Hydrogen sulfide poisoning is not known to pose additional risk during the use of bronchial or cardiac sensitizing agents.
www.atsdr.cdc.gov /MHMI/mmg114.html   (4595 words)

  
 IEA Technology   (Site not responding. Last check: )
Hydrogen can be produced directly from sunlight and water by biological organisms and using semiconductor-based systems similar to photovoltaics.
Storage of hydrogen is an important area for international co-operative research and development, particularly when considering transportation as a major user and the need for efficient energy storage for intermittent renewable power systems.
Although compressed gas and liquid hydrogen storage systems have been used in vehicle demonstrations world-wide, the issues of safety, capacity, and energy consumption have resulted in a broadening of the storage possibilities to include metal hydrides and carbon nanostructures.
www.iea.org /dbtw-wpd/Textbase/techno/iaresults.asp?Ia=Hydrogen   (907 words)

  
 4hydrogen.com - About Hydrogen Energy
The hydrogen atoms are separated from the oxygen atoms through a process called "electrolysis" and then compressed into fuel tanks.
If hydrogen fuel were spilled in large quantities it would evaporate instantaneously and the only by-product of hydrogen fuel is water.
Since hydrogen fuel cells rely on chemistry and not combustion, its emissions are virtually zero in comparison to the cleanest fuel combustion engines.
www.4hydrogen.com /about.html   (617 words)

  
 It's Elemental - The Element Hydrogen
It is estimated that 90% of the visible universe is composed of hydrogen.
Large amounts of hydrogen are combined with nitrogen from the air to produce ammonia (NH) through a process called the Haber process.
Hydrogen is also added to fats and oils, such as peanut oil, through a process called hydrogenation.
education.jlab.org /itselemental/ele001.html   (246 words)

  
 Hydrogen (28-Mar-2007)   (Site not responding. Last check: )
Since hydrogen is not available in significant quantities in nature in pure form, the main present way of getting hydrogen is steam methane reforming, and this will probably remain the most economical way as long as methane (natural gas) is available cheaply and in large quantities, and hydrogen is required only in small quantities.
The problem is that while hydrogen supplies three times the energy per pound of gasoline it has only one tenth the density when the hydrogen is in a liquid form and very much less when it is stored as a compressed gas.
However, hydrogen cannot come into common use until the political obstacles to nuclear expansion are overcome or the technological obstacles to large scale solar energy are overcome.
www-formal.stanford.edu /jmc/progress/hydrogen.html   (3542 words)

  
 Hydrogen   (Site not responding. Last check: )
Hydrogen is the simplest and most abundant element in the universe and powers the sun and stars through nuclear fusion.
Hydrogen can be added to gasoline or natural gas used in an internal combustion engine to increase efficiency and decrease emissions, or it can be used in the engine alone.
Hydrogen is produced by extracting it from compounds (also called hydrogen reformation) using electricity, biological reactions, or heat.
www.powerfrontiers.com /hydrogen.html   (1341 words)

  
 Hydrogen.com   (Site not responding. Last check: )
You may not be able to see hydrogen, taste it or hold it in your hand.
Hydrogen is in the protein keratin, which forms hair and skin.
Science allows us to capture hydrogen as a fuel to make electricity that powers everything from portable laptop computers to appliances in a suburban home to the energy needs of an entire neighborhood or region.
www.hydrogen.com /what.asp   (467 words)

  
 Chemical of the Week -- Hydrogen
In the laboratory, hydrogen is easily prepared by the reaction of a reactive metal such as zinc or magnesium with an acid (equation 7).
Hydrogen also reacts with active metals such as sodium to give a group of compounds known as metal hydrides, which contain the hydride anion, H
About 40% of the hydrogen produced industrially is used in the preparation of ammonia by the Haber process.
scifun.chem.wisc.edu /chemweek/Hydrogen/hydrogen.html   (424 words)

  
 Hydrogen
Hydrogen is such a simple system that it has been important in the development of physics, a test bed for quantum mechanics, which it has amply confirmed.
Hydrogen molecules do not seem to have been observed in the interstellar medium, but hydrogen atoms are generally taken as indicating the existence of a wide variety of other molecules.
Hydrogen gas is present in small amounts in volcanic gases where it is produced by chemical reactions, but more of it appears combined as hydrogen sulphide and nascent water.
www.du.edu /~jcalvert/phys/hydrogen.htm   (7686 words)

  
 HYDROGEN
Hydrogen is the simplest element and has an atomic number of one.
At room temperature, hydrogen is a colorless and tasteless gas and occurs as diatomic nonpolar molecules.
Hydrogen is also found combined with oxygen in compounds such as water and hydrogen peroxide.
www.uncp.edu /home/mcclurem/ptable/h.htm   (542 words)

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