How much liquid hydrogen could you get from 1 gallon of pure water?
598989
The amount of hydrogen by mass in water is 1/9.\nLiquid hydrogen has a density of roughly 1/14 that of water.\nThus the volume of liquid hydrogen would be 14/9 gallons, i.e. more by volume than you started with (Sounds wrong but it's true).\nIf you want me to convert it into terms of weight you'll have to use SI units. I always though a gallon was a warship they had back 400 years ago.
28381
Boil the water and catch the condensation on a sheet of metal foil and have it run off into a cup. Its pure water!
211914
It depends on the mass. The latent heat of fusion of water (the energy required to freeze it) is 333.7 kJ/kg. That means to freeze one kilogram of water, it requires removing 333.7 kilojoules of energy.\n\nThis assumes that the water is already at freezing temperature. If not, energy must first be removed to get it at freezing temp.
991620
http://video.google.com/videoplay?docid=-2134266654801392897\n\nmentos and diet soda, baking soda and vinegar.\n\nthough i'm wondering how the hell you're supposed to drop elemental hydrogen in water.  if you make it a solid that would be new and it wouldn't do anything...
327281
Water is created by burning hydrogen.
1158356
By itself, water is an unreactive substance by nature. So you cannot separate oxygen and hydrogen from the water molecules. However, there is only one ay in hich this canbe done: electrolysis.\n\nIt involves the passage of an electric current into a liquid, which naturally conducts electricity. Electrodes are used to pass the electric current. At both the electrodes, gases are evolved, depending upon the liquid.\n\nSome acid or alkali should be added to water for the evolution of gases, namely hydogen and oxygen at the electrodes.\n\n\n\nIt can be mass-produced, but the process is too costly. An application could be to use hydrogen in hydrogen powered cars to replace the more polluting petrol powered cars. \n\nMoreover, oxygen is also obtained by the fractional distillation of liquid air. It involves cooling air by decreasing the its pressure by placing them in special containers, capable of bearing atmospheric pressure. This process is more economical, compared to electrolysis. Liquid oxygen and hydrogen is used to power rockets in order to propel them into space. This process for the production of liquid oxygen and hydrogen is mass produced nowadays to power rocket and hydrogen powered cars. \n\nThanks
312779
Separating the Hydrogen and the Oxygen from regular water is a simple grade school physic's experiment. I have included a link to a experiment page. Now whether it is illegal in Great Briton, I do not know. Now why we don't use it, you would have to ask the major car manufactures that question. The technology is not new, there has been powerful fuel cells floating in outer space for almost 4 decades. The problem with hydrogen as a fuel, is that if it expands uncontrollably you will have one big explosion on your hands.
167483
water is H20 ( 2 hydrogen and 1 oxygen atoms). The Hydrogen atom's electron chemistry dictate it to be positive, where the oxygen atom's electron chemistry dictate it to be negative, so the negativity of 1 water atom will non-covalently bind to the positivity of ANOTHER water atom, and so on. So overall, H2O molecules form a lot of weak bonds that hold them closely, and it will take a lot of energy to break those bonds and let water be vapor. So it take a lot of heat energy to boil water/break water bonds.
125657
No, sadly. When you break down the chemical compund water, you would get Hydrogen in a gaseous state. You would have to compress it or cool it to bring it down to the temperature needed for it to condense into a liquid state.\n\nOh yeah, and I'm not sure, but I think the process is called electrolysis.
984400
1 gallon=4.545963 litres\n\ni hope that this helps
1047482
First find out the SAFE amount for one gallon of water. \nThen, multiply by 500.
643686
It would make water (H2O).
470314
the specific gravity of water is 1.
781338
The density is 0.357 g/mL. This is because specific gravity is the ratio of the density of the unknown liquid to the density of water, 1.0 g/mL.\n\nIf, say, you wanted to know the density of the liquid in pounds per gallon, you would multiply 0.357 by the density of water, which is 8.320 lb/gal
147331
It depends greatly on how much you want, how pure you want it, where you are going to get it, what its physical state it, ...\n\nThe cost of Hydrogen will varry quite  abit depending on whether you want 100% pure liquid Hydrogen bought from some chemical supplier, or Hydrogen you wake by running a current through salt water in your kitchen.
1150337
propane is 4.2 pounds per gallon as a liquid
1074230
Approx 6 pounds per gallon