* Reducing Agent: A reducing agent donates electrons to another substance, causing it to be reduced (gain electrons).
* Metal Oxides: Metal oxides contain a metal in a higher oxidation state (meaning it has lost electrons).
The Reaction:
When hydrogen reacts with a metal oxide, the hydrogen atoms gain electrons and are oxidized to form water (H₂O). Simultaneously, the metal in the oxide gains electrons and is reduced to its elemental form.
Example:
Consider the reaction of hydrogen with copper oxide (CuO):
H₂ + CuO → Cu + H₂O
* Hydrogen (H₂): Donates electrons, becomes oxidized to form water (H₂O).
* Copper oxide (CuO): Accepts electrons, the copper ion (Cu²⁺) is reduced to elemental copper (Cu).
In Summary:
Hydrogen acts as a reducing agent by donating electrons and causing the metal in the metal oxide to be reduced.
