Pure hydrogen does not occur naturally on Earth in large quantities, and it is locked up in enormous quantities in water, hydrocarbons, and other ______. One of the challenges of using hydrogen as a fuel comes from being able to efficiently extract hydrogen from these compounds (化合物).
举一反三
- ( ) are organic compounds that are chemically based on carbon, hydrogen and other nonmetallic elements.
- A Chemist can _the oxygen from hydrogen in water.
- Water ________ hydrogen and oxygen.
- Water is ____________ of hydrogen and oxygen.
- Water is a simple compound of two atoms of hydrogen and one atom of oxygen