Question

When do usually carbonates decompose?

Answer 1

When heated

Explanation:

Carbonates decompose usually when heated at high temperature.

For example, `CuCO_3` decomposes as follows:

`CuCO_3(s) + Heat -> CuO(s) + CO_2(g)`

This reaction is a good practice on reaction stoichiometry as you could see in the following video: