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  1. 1. Kacy
  2. 2. <ul><li>Atomic number </li></ul><ul><ul><li>The number of protons in an atomic nucleus </li></ul></ul><ul><li>Atomic mass </li></ul><ul><ul><li>The mass of an atom </li></ul></ul><ul><li>Number of Protons/Electrons: 1 </li></ul><ul><li>Number of Neutrons: 0 </li></ul><ul><li>Classification: Non-metal </li></ul><ul><li>Melting point: -259.14*C -434.45203*F </li></ul><ul><li>Boiling point: -252.87*C -423.166*F </li></ul><ul><li>Date of discovery: 1766 by Henry Cavendish </li></ul><ul><li>Name origin: Greek words hudor (water) and gennan (generate) </li></ul>
  3. 3. <ul><li>Hydrogen is the simplest and most abundant element in the universe </li></ul><ul><li>It is estimated that 90% of the visible universe is composed of hydrogen. </li></ul>
  4. 4. <ul><li>U.S. production: 3 billion cubic feet per year. </li></ul><ul><li>Hydrogen is prepared by: </li></ul><ul><ul><li>steam on heated carbon </li></ul></ul><ul><ul><li>decomposition of certain hydrocarbons with heat </li></ul></ul><ul><ul><li>reaction of sodium or potassium hydroxide on aluminum </li></ul></ul><ul><ul><li>electrolysis of water </li></ul></ul><ul><ul><li>displacement from acids by certain metals </li></ul></ul>
  5. 5. <ul><li>There is an estimated 400 to 500 hydrogen-fueled vehicles in the U.S. </li></ul><ul><ul><li>Mostly in California </li></ul></ul><ul><li>Most of these vehicles are buses and automobiles powered by electric motors </li></ul><ul><ul><li>They store hydrogen gas or liquid on board and convert the hydrogen into electricity for the motor using a fuel cell </li></ul></ul><ul><ul><li>Only a few of these vehicles burn the hydrogen directly (producing almost no pollution). </li></ul></ul><ul><li>The present cost of fuel cell vehicles greatly exceeds that of conventional vehicles in large part due to the expense of producing fuel cells </li></ul><ul><li>Liquid hydrogen is used in the study of superconductors and, when combined with liquid oxygen, makes an excellent rocket fuel. </li></ul>
  6. 6. <ul><li>Pure hydrogen is a gas, but it is barely found in our atmosphere </li></ul><ul><li>Hydrogen occurs primarily in combination with oxygen in water </li></ul><ul><ul><li>Its also present in organic matter such as living plants, petroleum, coal, etc. </li></ul></ul><ul><li>Hydrogen is the lightest element, so it can combine with all other elements -- sometimes explosively -- to form compounds. </li></ul><ul><li>Large amounts of hydrogen are combined with nitrogen from the air to produce ammonia (NH 3 ) through a process called the Haber process. </li></ul><ul><li>Hydrogen is also added to fats and oils, such as peanut oil, through a process called hydrogenation. </li></ul>
  7. 7. H 2 O                           
  8. 8. <ul><li>Hydrogen has three common isotopes. </li></ul><ul><li>The simplest isotope, called protium, is just ordinary hydrogen. </li></ul><ul><li>The second is a stable isotope called deuterium </li></ul><ul><ul><li>Discovered in 1932 </li></ul></ul><ul><li>The third isotope is called tritium </li></ul><ul><ul><li>Discovered in 1934 </li></ul></ul>
  9. 9. <ul><li>16 Nov 2008 < htm>. </li></ul><ul><li>19 Nov 2008 < es/IntermediateHydrogen.html >. </li></ul><ul><li>15 Nov 2008 </li></ul>