The chemical equation Cu + H2O2 + HCl -> CuCl2 + H2O.

Detailed information about the equation:

• Unbalanced equation: Cu + H₂O₂ + HCl -> CuCl₂ + H₂O
• Equation after balancing: Cu + 2H₂O₂ + 4HCl -> CuCl₂ + 4H₂O

Reaction conditions:
This reaction occurs when pure copper comes into contact with a solution of hydrochloric acid (HCl) and peroxide (H₂O₂).

Reaction process:
Firstly, the pure copper interacts with the peroxide to form Cu₂+ and water. The Cu₂+ then interacts with chloride ions from the hydrochloric acid to form CuCl₂. During this process, the oxidation of copper from Cu to Cu₂+ and hydrogen gas is released.

Phenomena:
When the reaction takes place, we will see a color change from the color of pure copper to the blue of CuCl₂. In addition, hydrogen gas is released.