* Hydrogen (H₂) acts as a reducing agent, meaning it donates electrons.
* Copper oxide (CuO) acts as an oxidizing agent, meaning it accepts electrons.
The reaction proceeds as follows:
CuO (s) + H₂ (g) → Cu (s) + H₂O (g)
Here's a breakdown:
* Copper oxide (CuO) is a black solid.
* Hydrogen gas (H₂) is a colorless and odorless gas.
* Copper (Cu) is a reddish-brown solid.
* Water (H₂O) is a colorless liquid, but it is produced as steam (gas) in this reaction.
What happens at the molecular level:
* Hydrogen molecules (H₂) are split into individual hydrogen atoms (H).
* The hydrogen atoms combine with oxygen atoms in copper oxide (CuO), forming water (H₂O) molecules.
* The copper ions (Cu²⁺) in copper oxide gain electrons and are reduced to copper metal (Cu).
Observations:
* The black copper oxide will turn reddish-brown as it is reduced to copper.
* Water vapor will be released, which can be observed as condensation on a cool surface.
Key points:
* This reaction is an example of a single displacement reaction, where hydrogen displaces copper from its oxide.
* The reaction is exothermic, meaning it releases heat.
This reaction is commonly used to demonstrate the principles of redox reactions and the properties of hydrogen as a reducing agent.
