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Hydrogen
Topic Started: Jan 14 2011, 06:41 PM (442 Views)
Michelle
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Hydrogen
Symbol: H
Number: 1
Series: Nonmetals
Group: 1
Phase: Gas
Boiling Point (°C): −252.87
Boiling Point (°F): −423.17

Melting Point (°C): −259.14
Melting Point (°F): −434.45


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. At standard temperature and pressure it is a colorless, odorless, nonmetallic, univalent, tasteless, highly flammable diatomic gas (H2). With an atomic mass of just 1.00794 g/mol, hydrogen is the lightest element of the universe. It is also the most abundant, constituting roughly 75% of all the universe's elemental matter.[1] It is present in water, all organic compounds, and in all living organisms. Hydrogen is able to react chemically with most other elements. Stars in their main sequence are overwhelmingly composed of hydrogen in its plasma state. The element is currently used primarily in fossil fuel upgrading. Other uses include as a lifting gas, as an alternative fuel (see Hydrogen economy), and more recently as a power source in fuel cells.

http://en.wikipedia.org/wiki/Hydrogen

Uses:
  • * commercial fixation of nitrogen from the air in the Haber ammonia process
    * hydrogenation of fats and oils
    * methanol production, in hydrodealkylation, hydrocracking, and hydrodesulphurization
    * rocket fuel
    * welding
    * production of hydrochloric acid
    * reduction of metallic ores
    * for filling balloons (hydrogen gas much lighter than air; however it ignites easily)
    * liquid H2 is important in cryogenics and in the study of superconductivity since its melting point is only just above absolute zero
HAZARDS AND RISKS

Hydrogen gas is not toxic but is dangerous if mixed with air or oxygen because of the fire and explosion risk. In principle, it can asphyxiate through denying the body access to oxygen.
Edited by Michelle, Jan 14 2011, 06:42 PM.
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CJ
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A very minor case of serious brain damage

Nice format!

Ever heard of deuterium and tritium?
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Michelle
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It's actually zookeeper601's layout, but thanks anyway.


And no... don't remember what those are. :-/
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CJ
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A very minor case of serious brain damage

Oh - deuterium is a hydrogen atom with one proton and one neutron in its nucleus (so it has relative atomic mass 2). Tritium has one proton and two neutrons (so it has relative atomic mass 3).
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Michelle
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Umm okayyyy.... kinda already know what tritium is -- it's a radioactive compound that glows in the dark. (I know because I've seen it, it's cool)
Edited by Michelle, Feb 5 2011, 10:52 PM.
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CJ
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A very minor case of serious brain damage

Yes, tritium is indeed radioactive. Deuterium isn't, though.
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Michelle
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Okay. Tritium is in one of my dad's guns so he can find it more easily.
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CJ
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A very minor case of serious brain damage

Ah, interesting. I didn't know it had applications like that.
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Michelle
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Yep. Also used in watch hands that glow in the dark, too..
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CJ
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A very minor case of serious brain damage

I didn't know that either. Then again, my watch is digital.
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Michelle
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Okay. Most people don't know it.
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