Lead oxide, when heated, undergoes a chemical change known as decomposition. Decomposition is a process in which a compound breaks down into simpler substances or elements. In the case of lead oxide, when heated, it decomposes into lead and oxygen.

The chemical equation for the decomposition of lead oxide is:

2PbO(s) → 2Pb(s) + O2(g)

In this reaction, solid lead oxide (PbO) breaks down to form solid lead (Pb) and oxygen gas (O2).

The decomposition of lead oxide occurs at a relatively high temperature. The exact temperature at which it decomposes depends on the specific compound and the conditions under which it is heated.