The balanced equation for the decomposition of copper(II) hydroxide when heated is:

Cu(OH)₂ (s) → CuO (s) + H₂O (g)

Here's a breakdown:

* Cu(OH)₂ (s) represents solid copper(II) hydroxide.

* CuO (s) represents solid copper(II) oxide.

* H₂O (g) represents water vapor.

Explanation:

When copper(II) hydroxide is heated, it decomposes into copper(II) oxide and water. The water evaporates as steam, leaving behind the black copper(II) oxide. This reaction is an example of a thermal decomposition reaction.