Presentation on Hydrogen

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Across
  1. 5. Metal oxide rare on earth.
  2. 6. synonymous with concentrate
  3. 7. The farmer wants to improve the ... of his crops
  4. 8. In chemistry, a process for producing syngas by reaction of hydrocarbons with water.
Down
  1. 1. In chemistry, technique that uses direct electric current to drive an otherwise non-spontaneous chemical reaction.
  2. 2. In organic chemistry, a organic compound consisting entirely of hydrogen and carbon.
  3. 3. those that absorb and emit infrared radiation in the wavelength range emitted by Earth.
  4. 4. electrochemical cell that converts the chemical energy of a fuel and an oxidizing agent into electricity