where can i find a table of thermodynamic properties of helium i need to fix a state?
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http://www.webelements.com/webelements/elements/text/He/thdyn.html\n\nhttp://quench-analysis.web.cern.ch/quench-analysis/phd-fs-html/node45.html\n\nhttp://www.public.asu.edu/~jtsasu/Mendelev/thermodynamics/helium.htm
932600
http://en.wikipedia.org/wiki/States_of_matter
1139103
There is a LIST of them in the link below:\nhttp://www.alltheinternet.com/texis/open/all?q=lewis+structure+of+ions
809795
Yes, helium will result but so will something else.  Elements are arranged in the periodic table according to their atomic number.  The atomic number is the number of protons in the nucleus.  So, Ra has an atomic number of 88.  So, it loses two protons (neutrons don't count in this calculation) so the new atom's atomic number is 86 (88 minus 2).  Look at a periodic table and the answer will be whatever atom has an atomic number of 86.
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Properties\n==========\n\nPhase gas \n\nDensity (0 °C, 101.325 kPa)\n        1.429 g/L \n\nMelting point 54.36 K\n              (-218.79 °C, -361.82 °F) \n\nBoiling point 90.20 K\n             (-182.95 °C, -297.31 °F) \n\nHeat of fusion (O2) 0.444 kJ/mol \n\nHeat of vaporization (O2) 6.82 kJ/mol \n\nHeat capacity (25 °C) (O2)\n              29.378 J/(mol·K) \n\nPromotes rapid combustion\n\nEssential to respiration of living being\n\nCommon existance as a diatomic molecule with the formula O2\n\nCan be toxic at high relative concentrations
62165
All three states (solid, liquid and vapor) exist at the triple point. Typically, for each one-component substance, there exists only one triple point -- a unique temperature and pressure. Helium is the exception, it will not freeze under its own vapor pressure.
910706
so you plot the proton number on the y-axis, and the different melting points of the elements across the x- axis.. actually are sure it has to be a bar graph.. i think a line/scatter graph would be more accurate maybe?
358448
specific heat? that would be represented by Cp.\nHowever if you are using delta H then it would either be: delta H (fus) which is the enthalpy of fusion, used in problems concerning melting point (indicating a state change from solid to liquid)\nOr it could be delta H (vap) which is the enthalpy of vaporization, used in problems concerning a boiling point (indicating a state change from liquid to gas)\n\nHeat calculations are done using the formulas:\nq=m x (delta T) Cp <-- Used when there is a temperature change, but no state change\ng= m x (delta H fus) <-- Used for state changes from solid to liquid\nq= m x (delta h vap) <-- Used for state changes from liquid to gas
1164545
It's easy. I'de do it for you, but I'm about to leave work.\n\nIf you know the order of electron configuration, and how many electrons go into each sublevel, all you have to do is know how many electrons you've got. Whatever atomic number it has, that's how many electrons the atom has. Use the electron configuration model to place all the electrons in their proper energy level, and if you have it right, you'll know how many valence electrons you have. \n\nIf your clueless, then I can't help you. Research electron configuration. You should be able to find a chart showing you the order. \n\nThe levels go all the way up to 7, and within each one, is a sublevel, s, p, d, and f. s has 2 electrons, p has 6, d has 10, and f has 14. Helium for example has two electrons. \n\nHe = 1s^2\n\nHelium has only one level, and two valence electrons. \n\nOxygen = 1s^2, 2s^2, 2p^4\n\nOxygen has 6 valence because on the two outermost levels, there are 6 electrons, and also you see the ground state.
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what you need to do, get a SI data book, and look up their natural state. not bonded with anything else, and possibly itself.\n\nPhophorus - white: molecular (P4). red: Chain. Black: Layer\nIodine - molecular (I2)\nMagnesium - hexagonal closest-packing\nNeon - cubic closest-packing\nArsenic -grey: 3d structure - Layer formation. yellow: molecular As4\nSulfur- molecular S8\nBoron - complicated structure.\nSelenium - grey: chain, Red: molecular: Se8\nGallium - Complicated\nCesium - body-centred cubic\nOxxygen - O2, O3 molecular
458975
Try Thermo.com/neslab contact them with any questions you have.
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I would suggest you use wikipedia...\n\nhttp://en.wikipedia.org/wiki/Quantum_mechanics
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This site is a good resource for chemical structures and their properties.\nhttp://www.chemicalland21.com/\n\nSpecifically for Sodium erythorbate:\nhttp://www.chemicalland21.com/lifescience/foco/SODIUM%20ERYTHORBATE.htm
910584
Try this site:\nwww.webelements.com\nit should be on there this is the site I used for my chemistry report(interview with an element) on Neon
17774
It doesn't give me room to list them all and explain them on here so let me direct you to a website I found that does a pretty good job:\nhttp://vergil.chemistry.gatech.edu/notes/quantrev/node20.html
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For recent physics and maths preprints, try here\n\nhttp://lanl.arxiv.org/\n\nor one of it's mirror sites
778635
Turning helium from liquid to gas is extremely easy.  Its boiling point is 4.2 degrees Kelvin.  Liquefying it is not as easy.  But it is routinely done, and liquid helium is the primary cooling method for cryogenic work and experiments.  Its cost in 2002 was around $5/liter US.  By comparison, liquid nitrogen is only $0.25/liter.  It is produced most efficiently on a large scale.  It's certainly possible to make the process portable, but you'd need a really good reason to justify the expense.  Even if you can't practically liquefy it locally, it's almost certainly worth recovering the helium gas and returning it to a central site for purification and liquefaction.